WebSVN - NaviCtrl - Diff - Rev 248 and 252


/*#######################################################################################*/
/* !!! THIS IS NOT FREE SOFTWARE !!!                                                     */
/*#######################################################################################*/
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Copyright (c) 2008 Ingo Busker, Holger Buss
// + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY
// + FOR NON COMMERCIAL USE ONLY
// + www.MikroKopter.com
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation),
// + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist.
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// + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen,
// + Verkauf von Luftbildaufnahmen, usw.
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht,
// + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts
// + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de"
// + eindeutig als Ursprung verlinkt werden
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion
// + Benutzung auf eigene Gefahr
// + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur
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// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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// + Redistributions of source code (with or without modifications) must retain the above copyright notice,
// + this list of conditions and the following disclaimer.
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// +     from this software without specific prior written permission.
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//
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#include <string.h>
#include "91x_lib.h"
#include "i2c.h"
#include "uart1.h"
#include "timer1.h"
#include "config.h"
#include "led.h"
 
 
volatile u8 I2C_State = I2C_STATE_OFF;          // only one byte, because of sync by nesting irqs
volatile u8 I2C_Error = I2C_ERROR_NOACK;    // only one byte!
 
// number of bytes to send
volatile u8 I2C_TxBufferSize;
// number of bytes to receive
volatile u8 I2C_RxBufferSize;
// the transfer buffer
volatile u8 I2C_Buffer[I2C_BUFFER_LEN];
// the transfer direction 
volatile u8 I2C_Direction;
// the slave address
volatile u8 I2C_SlaveAddress = 0x00;
// function pointer to process the received bytes
I2C_pRxHandler_t I2C_pRxHandler = NULL;
// goblal timeout 
volatile u32 I2C1_Timeout = 0;
 
//--------------------------------------------------------------
void I2C1_Init(void)
{
        I2C_InitTypeDef   I2C_Struct;
        GPIO_InitTypeDef  GPIO_InitStructure;
       
        I2C_State = I2C_STATE_OFF;
 
        UART1_PutString("\r\n I2C init...");
        // enable Port 2 peripherie
        SCU_APBPeriphClockConfig(__GPIO2, ENABLE);
        // disable a reset state
        SCU_APBPeriphReset(__GPIO2, DISABLE);
 
        // free a busy bus
 
        // At switch on I2C devices can get in a state where they
        // are still waiting for a command due to all the bus lines bouncing
        // around at startup have started clocking data into the device(s).
        // Enable the ports as open collector port outputs
        // and clock out at least 9 SCL pulses, then generate a stop
        // condition and then leave the clock line high.
 
        // configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;
        GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1;
        GPIO_Init(GPIO2, &GPIO_InitStructure);
 
        u8 i;
        u32 delay;
        // set SCL high and then SDA to low (start condition)
        GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
        delay = SetDelay(1);
        while (!CheckDelay(delay));
        GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET);
        // toggle SCL at least 10 times from high to low to high
        for(i = 0; i < 10; i++)
        {
                delay = SetDelay(1);
                while (!CheckDelay(delay));
 
                GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET);
                delay = SetDelay(1);
                while (!CheckDelay(delay));
                GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
        }
        delay = SetDelay(1);
        while (!CheckDelay(delay));
        // create stop condition setting SDA HIGH when SCL is HIGH
        GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET);
 
 
        // reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;
        GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT
        GPIO_Init(GPIO2, &GPIO_InitStructure);
 
        // enable I2C peripherie
        SCU_APBPeriphClockConfig(__I2C1,ENABLE);
        // reset I2C peripherie
        SCU_APBPeriphReset(__I2C1,ENABLE);
        SCU_APBPeriphReset(__I2C1,DISABLE);
 
        I2C_DeInit(I2C1);
        I2C_StructInit(&I2C_Struct);
        I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable;
        I2C_Struct.I2C_Ack = I2C_Ack_Enable;
        I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK;
        I2C_Struct.I2C_OwnAddress = 0x00;
        I2C_Init(I2C1, &I2C_Struct);
 
        // empty rx and tx buffer counters
        I2C_TxBufferSize = 0;
        I2C_RxBufferSize = 0;
 
        I2C_Cmd(I2C1, ENABLE);
        I2C_ITConfig(I2C1, ENABLE);
 
        VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1);
 
        I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);
        I2C_GenerateSTOP(I2C1, ENABLE);
        I2C_State = I2C_STATE_IDLE;
 
        // start some dummy transmissions cycles
        // to get the irq routine to work
        for(i=0;i<10;i++)
        {
                I2C_State = I2C_STATE_BUFFBUSY;
                I2C_Transmission(0,1,0,1);
                if(I2C_WaitForEndOfTransmission(10)) break;
                UART1_Putchar('.');
        }
        UART1_PutString("ok");
}
 
 
//--------------------------------------------------------------
void I2C1_Deinit(void)
{
        GPIO_InitTypeDef  GPIO_InitStructure;
        UART1_PutString("\r\n I2C deinit...");
        I2C_GenerateStart(I2C1, DISABLE);
        I2C_GenerateSTOP(I2C1, ENABLE);
        VIC_ITCmd(I2C1_ITLine, DISABLE);
        I2C_State = I2C_STATE_OFF;
        I2C_ITConfig(I2C1, DISABLE);
        I2C_Cmd(I2C1, DISABLE);
        I2C_DeInit(I2C1);
        SCU_APBPeriphClockConfig(__I2C1, DISABLE);
 
        // set ports to input
        SCU_APBPeriphClockConfig(__GPIO2, ENABLE);
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Direction =     GPIO_PinInput;
        GPIO_InitStructure.GPIO_Pin =                   GPIO_Pin_2 | GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Type =                  GPIO_Type_PushPull;
        GPIO_InitStructure.GPIO_IPInputConnected =      GPIO_IPInputConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate =     GPIO_InputAlt1;
        GPIO_Init(GPIO2, &GPIO_InitStructure);
 
        // empty rx and tx buffer
        I2C_TxBufferSize = 0;
        I2C_RxBufferSize = 0;
 
        I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);
 
        UART1_PutString("ok");
}
 
//--------------------------------------------------------------
void I2C1_IRQHandler(void)
{
        static u8 Rx_Idx = 0, Tx_Idx = 0;
        u16 status;
 
        //IENABLE;  // do not enable IRQ nesting for I2C!!!!
        // detemine I2C State
        status = I2C_GetLastEvent(I2C1);
 
        if(status & (I2C_FLAG_AF|I2C_FLAG_BERR))  // if an acknowledge failure or bus error occured
        {       // Set and subsequently clear the STOP bit while BTF is set.
                while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET)
                {
                        I2C_GenerateSTOP (I2C1, ENABLE);  // free the bus
                        I2C_GenerateSTOP (I2C1, DISABLE); // free the bus
                }
                I2C_State = I2C_STATE_IDLE;
                I2C_Error = I2C_ERROR_NOACK;
                VIC_ITCmd(I2C1_ITLine, DISABLE);
                LED_GRN_OFF;
                return;
        }
        else
        {       // depending on current i2c state
                switch(status)
                {
                        // the start condition was initiated on the bus
                        case I2C_EVENT_MASTER_MODE_SELECT:
                                LED_GRN_ON;
                                // update current bus state variable
                                // jump to rx state if there is nothing to send
                                switch(I2C_Direction)
                                {
                                        case I2C_MODE_TRANSMITTER:
                                                I2C_State = I2C_STATE_TX_PROGRESS;
                                                break;
 
                                        case I2C_MODE_RECEIVER:
                                                if (I2C_RxBufferSize == 0) // nothing to send?
                                                {
                                                        I2C_GenerateSTOP (I2C1, ENABLE);
                                                        VIC_ITCmd(I2C1_ITLine, DISABLE);
                                                        LED_GRN_OFF;
                                                        I2C_State = I2C_STATE_IDLE;
                                                        I2C_Error = I2C_ERROR_NONE;
                                                        return;
                                                }
                                                else
                                                {
                                                        I2C_State = I2C_STATE_RX_PROGRESS;
                                                }
                                                break;
 
                                        default: // invalid direction
                                                I2C_GenerateSTOP (I2C1, ENABLE);
                                                VIC_ITCmd(I2C1_ITLine, DISABLE);
                                                LED_GRN_OFF;
                                                I2C_State = I2C_STATE_IDLE;
                                                I2C_Error = I2C_ERROR_UNKNOWN;
                                                return;
                                }
                                // enable acknowledge
                                I2C_AcknowledgeConfig (I2C1, ENABLE);
                                // send address/direction byte on the bus
                                I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction);
                                break;
 
                        // the address byte was send
                        case I2C_EVENT_MASTER_MODE_SELECTED:
                                // Clear EV6 by set again the PE bit
                                I2C_Cmd(I2C1, ENABLE);
                                switch(I2C_State)
                                {
                                        case I2C_STATE_TX_PROGRESS:
                                        // send 1st data byte
                                        Tx_Idx = 0;
                                        I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]);
                                        Tx_Idx++;
                                        // reset timeout
                                        I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset
                                        break;
 
                                        case I2C_STATE_RX_PROGRESS:
                                        Rx_Idx = 0;
                                        // disable acknoledge if only one byte has to be read
                                        if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE);               
                                        break;
 
                                        default: // unknown I2C state
                                        // should never happen
                                        I2C_GenerateSTOP (I2C1, ENABLE);
                                        LED_GRN_OFF;
                                        VIC_ITCmd(I2C1_ITLine, DISABLE);
                                        I2C_State = I2C_STATE_IDLE;
                                        I2C_Error = I2C_ERROR_UNKNOWN;
                                        return;
                                        break;
                                }
                                break;
 
                        // the master has transmitted a byte and slave has been acknowledged
                        case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
 
                                // some bytes have to be transmitted
                                if(Tx_Idx < I2C_TxBufferSize)
                                {
                                        I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]);
                                        Tx_Idx++;
                                }
                                else // last byte was send
                                {
                                        // generate stop or repeated start condition
                                        if (I2C_RxBufferSize > 0) // is any answer byte expected?
                                        {
                                                I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition
                                                I2C_GenerateStart(I2C1, ENABLE);   // initiate repeated start condition on the bus
                                        }
                                        else
                                        {   // stop communication
                                                I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus
                                                VIC_ITCmd(I2C1_ITLine, DISABLE);
                                                LED_GRN_OFF;
                                                I2C_State = I2C_STATE_IDLE;                     // ready for new actions
                                                I2C_Error = I2C_ERROR_NONE;    
                                        }
                                }
                                break;
 
                        // the master has received a byte from the slave
                        case I2C_EVENT_MASTER_BYTE_RECEIVED:
                                // some bytes have to be received
                                if ( Rx_Idx+1 < I2C_RxBufferSize)
                                {       // copy received byte  from the data register to the rx-buffer
                                        I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1);
                                }
                                else // if the last byte was received
                                {
                                        // generate a STOP condition on the bus before reading data register
                                        I2C_GenerateSTOP(I2C1, ENABLE);
                                        I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1);
                                        // call the rx handler function to process recieved data
                                        if(I2C_pRxHandler != NULL) (*I2C_pRxHandler)((u8*)I2C_Buffer, I2C_RxBufferSize);
                                        I2C1_Timeout = SetDelay(I2C1_TIMEOUT);
                                        DebugOut.Analog[15]++;
                                        VIC_ITCmd(I2C1_ITLine, DISABLE);
                                        LED_GRN_OFF;
                                        I2C_State = I2C_STATE_IDLE;
                                        I2C_Error = I2C_ERROR_NONE;
                                        return;
                                }
                                Rx_Idx++;
                                // if the 2nd last byte was received disable acknowledge for the last one
                                if ( (Rx_Idx + 1) == I2C_RxBufferSize )
                                {
                                        I2C_AcknowledgeConfig(I2C1, DISABLE);
                                }
                                break;
 
                        default:// unknown event
                                // should never happen
                                I2C_GenerateSTOP (I2C1, ENABLE);
                                LED_GRN_OFF;
                                VIC_ITCmd(I2C1_ITLine, DISABLE);
                                I2C_State = I2C_STATE_IDLE;
                                I2C_Error = I2C_ERROR_UNKNOWN;
                                break;
                }
        }
        //IDISABLE;      // do not enable IRQ nesting for I2C!!!!
}
 
// ----------------------------------------------------------------------------------------
// wait for end of transmission
u8 I2C_WaitForEndOfTransmission(u32 timeout)
{
        u32 time = SetDelay(timeout);
        while(I2C_State != I2C_STATE_IDLE)
        {
                if(CheckDelay(time)) return(0);
        }
        return(1);
}
 
// ----------------------------------------------------------------------------------------
// try to get access to the transfer buffer      within a timeout limit
// returs 1 on success and 0 on error/timeout
u8 I2C_LockBuffer(u32 timeout)
{      
        if(I2C_WaitForEndOfTransmission(timeout))
        {
                I2C_State = I2C_STATE_BUFFBUSY;
                I2C_Error = I2C_ERROR_UNKNOWN;
                return(1);
        }
        else return(0);
}
// ----------------------------------------------------------------------------------------
// initate an i2c transmission
u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes)
{
        u8 retval = 0;
        if(I2C_State == I2C_STATE_BUFFBUSY)
        {
                if((RxBytes > I2C_BUFFER_LEN) || (TxBytes > I2C_BUFFER_LEN))
                {
                        I2C_State = I2C_STATE_IDLE;
                        return(retval);
                }      
                I2C_RxBufferSize = RxBytes;
                I2C_TxBufferSize = TxBytes;
                // set direction to master transmitter
                if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER;
                else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER;
                else // nothing to send or receive
                {
                        I2C_State = I2C_STATE_IDLE;
                        I2C_Error = I2C_ERROR_NONE;
                        I2C_TxBufferSize = 0;
                        I2C_RxBufferSize = 0;
                        return(retval);
                }
                // update slave address and rx data handler     funbction pointer
                I2C_SlaveAddress = SlaveAddr;
                I2C_pRxHandler = pRxHandler;
                // test on busy flag and clear it
                I2C_CheckEvent( I2C1, I2C_FLAG_BUSY );
                // enable I2C IRQ
                VIC_ITCmd(I2C1_ITLine, ENABLE);
                // initiate start condition on the bus
                I2C_GenerateStart(I2C1, ENABLE);
                retval = 1;
         }
         return(retval);
}
 

Rev 248	Rev 252
1	/#######################################################################################/	1	/#######################################################################################/
2	/* !!! THIS IS NOT FREE SOFTWARE !!! */	2	/* !!! THIS IS NOT FREE SOFTWARE !!! */
3	/#######################################################################################/	3	/#######################################################################################/
4	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	4	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5	// + Copyright (c) 2008 Ingo Busker, Holger Buss	5	// + Copyright (c) 2008 Ingo Busker, Holger Buss
6	// + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY	6	// + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY
7	// + FOR NON COMMERCIAL USE ONLY	7	// + FOR NON COMMERCIAL USE ONLY
8	// + www.MikroKopter.com	8	// + www.MikroKopter.com
9	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	9	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
10	// + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation),	10	// + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation),
11	// + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist.	11	// + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist.
12	// + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt	12	// + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt
13	// + bzgl. der Nutzungsbedingungen aufzunehmen.	13	// + bzgl. der Nutzungsbedingungen aufzunehmen.
14	// + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen,	14	// + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen,
15	// + Verkauf von Luftbildaufnahmen, usw.	15	// + Verkauf von Luftbildaufnahmen, usw.
16	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	16	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
17	// + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht,	17	// + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht,
18	// + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen	18	// + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen
19	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	19	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
20	// + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts	20	// + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts
21	// + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de"	21	// + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de"
22	// + eindeutig als Ursprung verlinkt werden	22	// + eindeutig als Ursprung verlinkt werden
23	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	23	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
24	// + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion	24	// + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion
25	// + Benutzung auf eigene Gefahr	25	// + Benutzung auf eigene Gefahr
26	// + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden	26	// + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden
27	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	27	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
28	// + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur	28	// + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur
29	// + mit unserer Zustimmung zulässig	29	// + mit unserer Zustimmung zulässig
30	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	30	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
31	// + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen	31	// + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen
32	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	32	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
33	// + Redistributions of source code (with or without modifications) must retain the above copyright notice,	33	// + Redistributions of source code (with or without modifications) must retain the above copyright notice,
34	// + this list of conditions and the following disclaimer.	34	// + this list of conditions and the following disclaimer.
35	// + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived	35	// + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived
36	// + from this software without specific prior written permission.	36	// + from this software without specific prior written permission.
37	// + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted	37	// + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted
38	// + for non-commercial use (directly or indirectly)	38	// + for non-commercial use (directly or indirectly)
39	// + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted	39	// + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted
40	// + with our written permission	40	// + with our written permission
41	// + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be	41	// + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be
42	// + clearly linked as origin	42	// + clearly linked as origin
43	// + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed	43	// + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed
44	//	44	//
45	// + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"	45	// + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
46	// + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE	46	// + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47	// + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE	47	// + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48	// + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE	48	// + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
49	// + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR	49	// + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
50	// + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF	50	// + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
51	// + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS	51	// + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
52	// + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN	52	// + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
53	// + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)	53	// + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
54	// + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE	54	// + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
55	// + POSSIBILITY OF SUCH DAMAGE.	55	// + POSSIBILITY OF SUCH DAMAGE.
56	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++	56	// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
57	#include <string.h>	57	#include <string.h>
58	#include "91x_lib.h"	58	#include "91x_lib.h"
59	#include "i2c.h"	59	#include "i2c.h"
60	#include "uart1.h"	60	#include "uart1.h"
61	#include "timer1.h"	61	#include "timer1.h"
62	#include "config.h"	62	#include "config.h"
63	#include "led.h"	63	#include "led.h"
64		64
65		65
66	volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs	66	volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs
-		67	volatile u8 I2C_Error = I2C_ERROR_NOACK; // only one byte!
67		68
68	// number of bytes to send	69	// number of bytes to send
69	volatile u8 I2C_TxBufferSize;	70	volatile u8 I2C_TxBufferSize;
70	// number of bytes to receive	71	// number of bytes to receive
71	volatile u8 I2C_RxBufferSize;	72	volatile u8 I2C_RxBufferSize;
72	// the transfer buffer	73	// the transfer buffer
73	volatile u8 I2C_Buffer[I2C_BUFFER_LEN];	74	volatile u8 I2C_Buffer[I2C_BUFFER_LEN];
74	// the transfer direction	75	// the transfer direction
75	volatile u8 I2C_Direction;	76	volatile u8 I2C_Direction;
76	// the slave address	77	// the slave address
77	volatile u8 I2C_SlaveAddress = 0x00;	78	volatile u8 I2C_SlaveAddress = 0x00;
78	// function pointer to process the received bytes	79	// function pointer to process the received bytes
79	I2C_pRxHandler_t I2C_pRxHandler = NULL;	80	I2C_pRxHandler_t I2C_pRxHandler = NULL;
80	// goblal timeout	81	// goblal timeout
81	volatile u32 I2C1_Timeout = 0;	82	volatile u32 I2C1_Timeout = 0;
82		83
83	//--------------------------------------------------------------	84	//--------------------------------------------------------------
84	void I2C1_Init(void)	85	void I2C1_Init(void)
85	{	86	{
86	I2C_InitTypeDef I2C_Struct;	87	I2C_InitTypeDef I2C_Struct;
87	GPIO_InitTypeDef GPIO_InitStructure;	88	GPIO_InitTypeDef GPIO_InitStructure;
88		89
89	I2C_State = I2C_STATE_OFF;	90	I2C_State = I2C_STATE_OFF;
90		91
91	UART1_PutString("\r\n I2C init...");	92	UART1_PutString("\r\n I2C init...");
92	// enable Port 2 peripherie	93	// enable Port 2 peripherie
93	SCU_APBPeriphClockConfig(__GPIO2, ENABLE);	94	SCU_APBPeriphClockConfig(__GPIO2, ENABLE);
94	// disable a reset state	95	// disable a reset state
95	SCU_APBPeriphReset(__GPIO2, DISABLE);	96	SCU_APBPeriphReset(__GPIO2, DISABLE);
96		97
97	// free a busy bus	98	// free a busy bus
98		99
99	// At switch on I2C devices can get in a state where they	100	// At switch on I2C devices can get in a state where they
100	// are still waiting for a command due to all the bus lines bouncing	101	// are still waiting for a command due to all the bus lines bouncing
101	// around at startup have started clocking data into the device(s).	102	// around at startup have started clocking data into the device(s).
102	// Enable the ports as open collector port outputs	103	// Enable the ports as open collector port outputs
103	// and clock out at least 9 SCL pulses, then generate a stop	104	// and clock out at least 9 SCL pulses, then generate a stop
104	// condition and then leave the clock line high.	105	// condition and then leave the clock line high.
105		106
106	// configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation	107	// configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation
107	GPIO_StructInit(&GPIO_InitStructure);	108	GPIO_StructInit(&GPIO_InitStructure);
108	GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;	109	GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
109	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 \| GPIO_Pin_3;	110	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 \| GPIO_Pin_3;
110	GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;	111	GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;
111	GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;	112	GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;
112	GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1;	113	GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1;
113	GPIO_Init(GPIO2, &GPIO_InitStructure);	114	GPIO_Init(GPIO2, &GPIO_InitStructure);
114		115
115	u8 i;	116	u8 i;
116	u32 delay;	117	u32 delay;
117	// set SCL high and then SDA to low (start condition)	118	// set SCL high and then SDA to low (start condition)
118	GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);	119	GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
119	delay = SetDelay(1);	120	delay = SetDelay(1);
120	while (!CheckDelay(delay));	121	while (!CheckDelay(delay));
121	GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET);	122	GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET);
122	// toggle SCL at least 10 times from high to low to high	123	// toggle SCL at least 10 times from high to low to high
123	for(i = 0; i < 10; i++)	124	for(i = 0; i < 10; i++)
124	{	125	{
125	delay = SetDelay(1);	126	delay = SetDelay(1);
126	while (!CheckDelay(delay));	127	while (!CheckDelay(delay));
127		128
128	GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET);	129	GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET);
129	delay = SetDelay(1);	130	delay = SetDelay(1);
130	while (!CheckDelay(delay));	131	while (!CheckDelay(delay));
131	GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);	132	GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
132	}	133	}
133	delay = SetDelay(1);	134	delay = SetDelay(1);
134	while (!CheckDelay(delay));	135	while (!CheckDelay(delay));
135	// create stop condition setting SDA HIGH when SCL is HIGH	136	// create stop condition setting SDA HIGH when SCL is HIGH
136	GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET);	137	GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET);
137		138
138		139
139	// reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT	140	// reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT
140	GPIO_StructInit(&GPIO_InitStructure);	141	GPIO_StructInit(&GPIO_InitStructure);
141	GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;	142	GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
142	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 \| GPIO_Pin_3;	143	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 \| GPIO_Pin_3;
143	GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;	144	GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;
144	GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable;	145	GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable;
145	GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT	146	GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT
146	GPIO_Init(GPIO2, &GPIO_InitStructure);	147	GPIO_Init(GPIO2, &GPIO_InitStructure);
147		148
148	// enable I2C peripherie	149	// enable I2C peripherie
149	SCU_APBPeriphClockConfig(__I2C1,ENABLE);	150	SCU_APBPeriphClockConfig(__I2C1,ENABLE);
150	// reset I2C peripherie	151	// reset I2C peripherie
151	SCU_APBPeriphReset(__I2C1,ENABLE);	152	SCU_APBPeriphReset(__I2C1,ENABLE);
152	SCU_APBPeriphReset(__I2C1,DISABLE);	153	SCU_APBPeriphReset(__I2C1,DISABLE);
153		154
154	I2C_DeInit(I2C1);	155	I2C_DeInit(I2C1);
155	I2C_StructInit(&I2C_Struct);	156	I2C_StructInit(&I2C_Struct);
156	I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable;	157	I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable;
157	I2C_Struct.I2C_Ack = I2C_Ack_Enable;	158	I2C_Struct.I2C_Ack = I2C_Ack_Enable;
158	I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK;	159	I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK;
159	I2C_Struct.I2C_OwnAddress = 0x00;	160	I2C_Struct.I2C_OwnAddress = 0x00;
160	I2C_Init(I2C1, &I2C_Struct);	161	I2C_Init(I2C1, &I2C_Struct);
161		162
162	// empty rx and tx buffer counters	163	// empty rx and tx buffer counters
163	I2C_TxBufferSize = 0;	164	I2C_TxBufferSize = 0;
164	I2C_RxBufferSize = 0;	165	I2C_RxBufferSize = 0;
165		166
166	I2C_Cmd(I2C1, ENABLE);	167	I2C_Cmd(I2C1, ENABLE);
167	I2C_ITConfig(I2C1, ENABLE);	168	I2C_ITConfig(I2C1, ENABLE);
168		169
169	VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1);	170	VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1);
170		171
171	I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);	172	I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);
172	I2C_GenerateSTOP(I2C1, ENABLE);	173	I2C_GenerateSTOP(I2C1, ENABLE);
173	I2C_State = I2C_STATE_IDLE;	174	I2C_State = I2C_STATE_IDLE;
174		175
175	// start some dummy transmissions cycles	176	// start some dummy transmissions cycles
176	// to get the irq routine to work	177	// to get the irq routine to work
177	for(i=0;i<10;i++)	178	for(i=0;i<10;i++)
178	{	179	{
179	I2C_State = I2C_STATE_BUFFBUSY;	180	I2C_State = I2C_STATE_BUFFBUSY;
180	I2C_Transmission(0,1,0,1);	181	I2C_Transmission(0,1,0,1);
181	if(I2C_WaitForEndOfTransmission(10)) break;	182	if(I2C_WaitForEndOfTransmission(10)) break;
182	UART1_Putchar('.');	183	UART1_Putchar('.');
183	}	184	}
184	UART1_PutString("ok");	185	UART1_PutString("ok");
185	}	186	}
186		187
187		188
188	//--------------------------------------------------------------	189	//--------------------------------------------------------------
189	void I2C1_Deinit(void)	190	void I2C1_Deinit(void)
190	{	191	{
191	GPIO_InitTypeDef GPIO_InitStructure;	192	GPIO_InitTypeDef GPIO_InitStructure;
192	UART1_PutString("\r\n I2C deinit...");	193	UART1_PutString("\r\n I2C deinit...");
193	I2C_GenerateStart(I2C1, DISABLE);	194	I2C_GenerateStart(I2C1, DISABLE);
194	I2C_GenerateSTOP(I2C1, ENABLE);	195	I2C_GenerateSTOP(I2C1, ENABLE);
195	VIC_ITCmd(I2C1_ITLine, DISABLE);	196	VIC_ITCmd(I2C1_ITLine, DISABLE);
196	I2C_State = I2C_STATE_OFF;	197	I2C_State = I2C_STATE_OFF;
197	I2C_ITConfig(I2C1, DISABLE);	198	I2C_ITConfig(I2C1, DISABLE);
198	I2C_Cmd(I2C1, DISABLE);	199	I2C_Cmd(I2C1, DISABLE);
199	I2C_DeInit(I2C1);	200	I2C_DeInit(I2C1);
200	SCU_APBPeriphClockConfig(__I2C1, DISABLE);	201	SCU_APBPeriphClockConfig(__I2C1, DISABLE);
201		202
202	// set ports to input	203	// set ports to input
203	SCU_APBPeriphClockConfig(__GPIO2, ENABLE);	204	SCU_APBPeriphClockConfig(__GPIO2, ENABLE);
204	GPIO_StructInit(&GPIO_InitStructure);	205	GPIO_StructInit(&GPIO_InitStructure);
205	GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;	206	GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
206	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 \| GPIO_Pin_3;	207	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 \| GPIO_Pin_3;
207	GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;	208	GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;
208	GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;	209	GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;
209	GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;	210	GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;
210	GPIO_Init(GPIO2, &GPIO_InitStructure);	211	GPIO_Init(GPIO2, &GPIO_InitStructure);
211		212
212	// empty rx and tx buffer	213	// empty rx and tx buffer
213	I2C_TxBufferSize = 0;	214	I2C_TxBufferSize = 0;
214	I2C_RxBufferSize = 0;	215	I2C_RxBufferSize = 0;
215		216
216	I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);	217	I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);
217		218
218	UART1_PutString("ok");	219	UART1_PutString("ok");
219	}	220	}
220		221
221	//--------------------------------------------------------------	222	//--------------------------------------------------------------
222	void I2C1_IRQHandler(void)	223	void I2C1_IRQHandler(void)
223	{	224	{
224	static u8 Rx_Idx = 0, Tx_Idx = 0;	225	static u8 Rx_Idx = 0, Tx_Idx = 0;
225	u16 status;	226	u16 status;
226		227
227	//IENABLE; // do not enable IRQ nesting for I2C!!!!	228	//IENABLE; // do not enable IRQ nesting for I2C!!!!
228	// detemine I2C State	229	// detemine I2C State
229	status = I2C_GetLastEvent(I2C1);	230	status = I2C_GetLastEvent(I2C1);
230		231
231	if(status & (I2C_FLAG_AF\|I2C_FLAG_BERR)) // if an acknowledge failure or bus error occured	232	if(status & (I2C_FLAG_AF\|I2C_FLAG_BERR)) // if an acknowledge failure or bus error occured
232	{ // Set and subsequently clear the STOP bit while BTF is set.	233	{ // Set and subsequently clear the STOP bit while BTF is set.
233	while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET)	234	while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET)
234	{	235	{
235	I2C_GenerateSTOP (I2C1, ENABLE); // free the bus	236	I2C_GenerateSTOP (I2C1, ENABLE); // free the bus
236	I2C_GenerateSTOP (I2C1, DISABLE); // free the bus	237	I2C_GenerateSTOP (I2C1, DISABLE); // free the bus
237	}	238	}
238	I2C_State = I2C_STATE_IDLE;	239	I2C_State = I2C_STATE_IDLE;
-		240	I2C_Error = I2C_ERROR_NOACK;
239	VIC_ITCmd(I2C1_ITLine, DISABLE);	241	VIC_ITCmd(I2C1_ITLine, DISABLE);
240	LED_GRN_OFF;	242	LED_GRN_OFF;
241	return;	243	return;
242	}	244	}
243	else	245	else
244	{ // depending on current i2c state	246	{ // depending on current i2c state
245	switch(status)	247	switch(status)
246	{	248	{
247	// the start condition was initiated on the bus	249	// the start condition was initiated on the bus
248	case I2C_EVENT_MASTER_MODE_SELECT:	250	case I2C_EVENT_MASTER_MODE_SELECT:
249	LED_GRN_ON;	251	LED_GRN_ON;
250	// update current bus state variable	252	// update current bus state variable
251	// jump to rx state if there is nothing to send	253	// jump to rx state if there is nothing to send
252	switch(I2C_Direction)	254	switch(I2C_Direction)
253	{	255	{
254	case I2C_MODE_TRANSMITTER:	256	case I2C_MODE_TRANSMITTER:
255	I2C_State = I2C_STATE_TX_PROGRESS;	257	I2C_State = I2C_STATE_TX_PROGRESS;
256	break;	258	break;
257		259
258	case I2C_MODE_RECEIVER:	260	case I2C_MODE_RECEIVER:
259	if (I2C_RxBufferSize == 0) // nothing to send?	261	if (I2C_RxBufferSize == 0) // nothing to send?
260	{	262	{
261	I2C_GenerateSTOP (I2C1, ENABLE);	263	I2C_GenerateSTOP (I2C1, ENABLE);
262	VIC_ITCmd(I2C1_ITLine, DISABLE);	264	VIC_ITCmd(I2C1_ITLine, DISABLE);
263	LED_GRN_OFF;	265	LED_GRN_OFF;
264	I2C_State = I2C_STATE_IDLE;	266	I2C_State = I2C_STATE_IDLE;
-		267	I2C_Error = I2C_ERROR_NONE;
265	return;	268	return;
266	}	269	}
267	else	270	else
268	{	271	{
269	I2C_State = I2C_STATE_RX_PROGRESS;	272	I2C_State = I2C_STATE_RX_PROGRESS;
270	}	273	}
271	break;	274	break;
272		275
273	default: // invalid direction	276	default: // invalid direction
274	I2C_GenerateSTOP (I2C1, ENABLE);	277	I2C_GenerateSTOP (I2C1, ENABLE);
275	VIC_ITCmd(I2C1_ITLine, DISABLE);	278	VIC_ITCmd(I2C1_ITLine, DISABLE);
276	LED_GRN_OFF;	279	LED_GRN_OFF;
277	I2C_State = I2C_STATE_IDLE;	280	I2C_State = I2C_STATE_IDLE;
-		281	I2C_Error = I2C_ERROR_UNKNOWN;
278	return;	282	return;
279	}	283	}
280	// enable acknowledge	284	// enable acknowledge
281	I2C_AcknowledgeConfig (I2C1, ENABLE);	285	I2C_AcknowledgeConfig (I2C1, ENABLE);
282	// send address/direction byte on the bus	286	// send address/direction byte on the bus
283	I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction);	287	I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction);
284	break;	288	break;
285		289
286	// the address byte was send	290	// the address byte was send
287	case I2C_EVENT_MASTER_MODE_SELECTED:	291	case I2C_EVENT_MASTER_MODE_SELECTED:
288	// Clear EV6 by set again the PE bit	292	// Clear EV6 by set again the PE bit
289	I2C_Cmd(I2C1, ENABLE);	293	I2C_Cmd(I2C1, ENABLE);
290	switch(I2C_State)	294	switch(I2C_State)
291	{	295	{
292	case I2C_STATE_TX_PROGRESS:	296	case I2C_STATE_TX_PROGRESS:
293	// send 1st data byte	297	// send 1st data byte
294	Tx_Idx = 0;	298	Tx_Idx = 0;
295	I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]);	299	I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]);
296	Tx_Idx++;	300	Tx_Idx++;
297	// reset timeout	301	// reset timeout
298	I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset	302	I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset
299	break;	303	break;
300		304
301	case I2C_STATE_RX_PROGRESS:	305	case I2C_STATE_RX_PROGRESS:
302	Rx_Idx = 0;	306	Rx_Idx = 0;
303	// disable acknoledge if only one byte has to be read	307	// disable acknoledge if only one byte has to be read
304	if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE);	308	if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE);
305	break;	309	break;
306		310
307	default: // unknown I2C state	311	default: // unknown I2C state
308	// should never happen	312	// should never happen
309	I2C_GenerateSTOP (I2C1, ENABLE);	313	I2C_GenerateSTOP (I2C1, ENABLE);
310	LED_GRN_OFF;	314	LED_GRN_OFF;
311	VIC_ITCmd(I2C1_ITLine, DISABLE);	315	VIC_ITCmd(I2C1_ITLine, DISABLE);
312	I2C_State = I2C_STATE_IDLE;	316	I2C_State = I2C_STATE_IDLE;
-		317	I2C_Error = I2C_ERROR_UNKNOWN;
313	return;	318	return;
314	break;	319	break;
315	}	320	}
316	break;	321	break;
317		322
318	// the master has transmitted a byte and slave has been acknowledged	323	// the master has transmitted a byte and slave has been acknowledged
319	case I2C_EVENT_MASTER_BYTE_TRANSMITTED:	324	case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
320		325
321	// some bytes have to be transmitted	326	// some bytes have to be transmitted
322	if(Tx_Idx < I2C_TxBufferSize)	327	if(Tx_Idx < I2C_TxBufferSize)
323	{	328	{
324	I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]);	329	I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]);
325	Tx_Idx++;	330	Tx_Idx++;
326	}	331	}
327	else // last byte was send	332	else // last byte was send
328	{	333	{
329	// generate stop or repeated start condition	334	// generate stop or repeated start condition
330	if (I2C_RxBufferSize > 0) // is any answer byte expected?	335	if (I2C_RxBufferSize > 0) // is any answer byte expected?
331	{	336	{
332	I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition	337	I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition
333	I2C_GenerateStart(I2C1, ENABLE); // initiate repeated start condition on the bus	338	I2C_GenerateStart(I2C1, ENABLE); // initiate repeated start condition on the bus
334	}	339	}
335	else	340	else
336	{ // stop communication	341	{ // stop communication
337	I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus	342	I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus
338	VIC_ITCmd(I2C1_ITLine, DISABLE);	343	VIC_ITCmd(I2C1_ITLine, DISABLE);
339	LED_GRN_OFF;	344	LED_GRN_OFF;
340	I2C_State = I2C_STATE_IDLE; // ready for new actions	345	I2C_State = I2C_STATE_IDLE; // ready for new actions
-		346	I2C_Error = I2C_ERROR_NONE;
341	}	347	}
342	}	348	}
343	break;	349	break;
344		350
345	// the master has received a byte from the slave	351	// the master has received a byte from the slave
346	case I2C_EVENT_MASTER_BYTE_RECEIVED:	352	case I2C_EVENT_MASTER_BYTE_RECEIVED:
347	// some bytes have to be received	353	// some bytes have to be received
348	if ( Rx_Idx+1 < I2C_RxBufferSize)	354	if ( Rx_Idx+1 < I2C_RxBufferSize)
349	{ // copy received byte from the data register to the rx-buffer	355	{ // copy received byte from the data register to the rx-buffer
350	I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1);	356	I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1);
351	}	357	}
352	else // if the last byte was received	358	else // if the last byte was received
353	{	359	{
354	// generate a STOP condition on the bus before reading data register	360	// generate a STOP condition on the bus before reading data register
355	I2C_GenerateSTOP(I2C1, ENABLE);	361	I2C_GenerateSTOP(I2C1, ENABLE);
356	I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1);	362	I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1);
357	// call the rx handler function to process recieved data	363	// call the rx handler function to process recieved data
358	if(I2C_pRxHandler != NULL) (I2C_pRxHandler)((u8)I2C_Buffer, I2C_RxBufferSize);	364	if(I2C_pRxHandler != NULL) (I2C_pRxHandler)((u8)I2C_Buffer, I2C_RxBufferSize);
359	I2C1_Timeout = SetDelay(I2C1_TIMEOUT);	365	I2C1_Timeout = SetDelay(I2C1_TIMEOUT);
360	DebugOut.Analog[15]++;	366	DebugOut.Analog[15]++;
361	VIC_ITCmd(I2C1_ITLine, DISABLE);	367	VIC_ITCmd(I2C1_ITLine, DISABLE);
362	LED_GRN_OFF;	368	LED_GRN_OFF;
363	I2C_State = I2C_STATE_IDLE;	369	I2C_State = I2C_STATE_IDLE;
-		370	I2C_Error = I2C_ERROR_NONE;
364	return;	371	return;
365	}	372	}
366	Rx_Idx++;	373	Rx_Idx++;
367	// if the 2nd last byte was received disable acknowledge for the last one	374	// if the 2nd last byte was received disable acknowledge for the last one
368	if ( (Rx_Idx + 1) == I2C_RxBufferSize )	375	if ( (Rx_Idx + 1) == I2C_RxBufferSize )
369	{	376	{
370	I2C_AcknowledgeConfig(I2C1, DISABLE);	377	I2C_AcknowledgeConfig(I2C1, DISABLE);
371	}	378	}
372	break;	379	break;
373		380
374	default:// unknown event	381	default:// unknown event
375	// should never happen	382	// should never happen
376	I2C_GenerateSTOP (I2C1, ENABLE);	383	I2C_GenerateSTOP (I2C1, ENABLE);
377	LED_GRN_OFF;	384	LED_GRN_OFF;
378	VIC_ITCmd(I2C1_ITLine, DISABLE);	385	VIC_ITCmd(I2C1_ITLine, DISABLE);
379	I2C_State = I2C_STATE_IDLE;	386	I2C_State = I2C_STATE_IDLE;
-		387	I2C_Error = I2C_ERROR_UNKNOWN;
380	break;	388	break;
381	}	389	}
382	}	390	}
383	//IDISABLE; // do not enable IRQ nesting for I2C!!!!	391	//IDISABLE; // do not enable IRQ nesting for I2C!!!!
384	}	392	}
385		393
386	// ----------------------------------------------------------------------------------------	394	// ----------------------------------------------------------------------------------------
387	// wait for end of transmission	395	// wait for end of transmission
388	u8 I2C_WaitForEndOfTransmission(u32 timeout)	396	u8 I2C_WaitForEndOfTransmission(u32 timeout)
389	{	397	{
390	u32 time = SetDelay(timeout);	398	u32 time = SetDelay(timeout);
391	while(I2C_State != I2C_STATE_IDLE)	399	while(I2C_State != I2C_STATE_IDLE)
392	{	400	{
393	if(CheckDelay(time)) return(0);	401	if(CheckDelay(time)) return(0);
394	}	402	}
395	return(1);	403	return(1);
396	}	404	}
397		405
398	// ----------------------------------------------------------------------------------------	406	// ----------------------------------------------------------------------------------------
399	// try to get access to the transfer buffer within a timeout limit	407	// try to get access to the transfer buffer within a timeout limit
400	// returs 1 on success and 0 on error/timeout	408	// returs 1 on success and 0 on error/timeout
401	u8 I2C_LockBuffer(u32 timeout)	409	u8 I2C_LockBuffer(u32 timeout)
402	{	410	{
403	if(I2C_WaitForEndOfTransmission(timeout))	411	if(I2C_WaitForEndOfTransmission(timeout))
404	{	412	{
405	I2C_State = I2C_STATE_BUFFBUSY;	413	I2C_State = I2C_STATE_BUFFBUSY;
-		414	I2C_Error = I2C_ERROR_UNKNOWN;
406	return(1);	415	return(1);
407	}	416	}
408	else return(0);	417	else return(0);
409	}	418	}
410	// ----------------------------------------------------------------------------------------	419	// ----------------------------------------------------------------------------------------
411	// initate an i2c transmission	420	// initate an i2c transmission
412	u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes)	421	u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes)
413	{	422	{
414	u8 retval = 0;	423	u8 retval = 0;
415	if(I2C_State == I2C_STATE_BUFFBUSY)	424	if(I2C_State == I2C_STATE_BUFFBUSY)
416	{	425	{
417	if((RxBytes > I2C_BUFFER_LEN) \|\| (TxBytes > I2C_BUFFER_LEN))	426	if((RxBytes > I2C_BUFFER_LEN) \|\| (TxBytes > I2C_BUFFER_LEN))
418	{	427	{
419	I2C_State = I2C_STATE_IDLE;	428	I2C_State = I2C_STATE_IDLE;
420	return(retval);	429	return(retval);
421	}	430	}
422	I2C_RxBufferSize = RxBytes;	431	I2C_RxBufferSize = RxBytes;
423	I2C_TxBufferSize = TxBytes;	432	I2C_TxBufferSize = TxBytes;
424	// set direction to master transmitter	433	// set direction to master transmitter
425	if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER;	434	if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER;
426	else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER;	435	else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER;
427	else // nothing to send or receive	436	else // nothing to send or receive
428	{	437	{
429	I2C_State = I2C_STATE_IDLE;	438	I2C_State = I2C_STATE_IDLE;
-		439	I2C_Error = I2C_ERROR_NONE;
430	I2C_TxBufferSize = 0;	440	I2C_TxBufferSize = 0;
431	I2C_RxBufferSize = 0;	441	I2C_RxBufferSize = 0;
432	return(retval);	442	return(retval);
433	}	443	}
434	// update slave address and rx data handler funbction pointer	444	// update slave address and rx data handler funbction pointer
435	I2C_SlaveAddress = SlaveAddr;	445	I2C_SlaveAddress = SlaveAddr;
436	I2C_pRxHandler = pRxHandler;	446	I2C_pRxHandler = pRxHandler;
437	// test on busy flag and clear it	447	// test on busy flag and clear it
438	I2C_CheckEvent( I2C1, I2C_FLAG_BUSY );	448	I2C_CheckEvent( I2C1, I2C_FLAG_BUSY );
439	// enable I2C IRQ	449	// enable I2C IRQ
440	VIC_ITCmd(I2C1_ITLine, ENABLE);	450	VIC_ITCmd(I2C1_ITLine, ENABLE);
441	// initiate start condition on the bus	451	// initiate start condition on the bus
442	I2C_GenerateStart(I2C1, ENABLE);	452	I2C_GenerateStart(I2C1, ENABLE);
443	retval = 1;	453	retval = 1;
444	}	454	}
445	return(retval);	455	return(retval);
446	}	456	}
447		457

Subversion Repositories NaviCtrl

(root)/tags/V0.30h/i2c.c @ 457 - Rev 248 → 252