WebSVN - NaviCtrl - Diff - Rev 24 and 41


/*#######################################################################################*/
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// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Copyright (c) 2008 Ingo Busker, Holger Buss
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#include "91x_lib.h"
 
//________________________________________________________________________________________________________________________________________
// Module name:                 ssc.c 
// Compiler used:               avr-gcc 3.4.5
// Last Modifikation:   24.07.2007
// Version:                             1.02
// Authors:                             Stephan Busker  
// Description:                 Source files for access to the synchrnous serial channel.
//                                              Copyright (C) 2007 Stephan Busker
//........................................................................................................................................
// ext. Functions:              extern void                     SSC_Init(void);         
//                                              extern u8                               SSC_GetChar (void);
//                                              extern void                     SSC_PutChar (u8 Byte);
//                                              extern void                     SSC_Disable(void); 
//                                              extern void                     SSC_Enable(void); 
//                                              extern void                             SSC_ClearRxFifo();
//........................................................................................................................................
// URL:                                 www.Mikro-Control.de
// mailto:                              stephan.busker@mikro-control.de
//________________________________________________________________________________________________________________________________________
 
 
 
//________________________________________________________________________________________________________________________________________
// Function:    SSC_Enable(void);
// 
// Description: This function enables chipselect of the sdcard (active low) 
//                              
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
 
void SSC_Enable(void)
{
        // enable chipselect of the sd-card (P5.4 -> SD-CS, active low). 
        GPIO_WriteBit(GPIO5, GPIO_Pin_4 , Bit_RESET);
}
 
//________________________________________________________________________________________________________________________________________
// Function:    SSC_Disable(void);
// 
// Description: This function disables chipselect of the sdcard (active low) 
//                              
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
 
void SSC_Disable(void)
{
        // disable chipselect of the sd-card (P5.4 -> SD-CS, active low). 
        GPIO_WriteBit(GPIO5, GPIO_Pin_4 , Bit_SET);
}
 
 
//________________________________________________________________________________________________________________________________________
// Function:    SSC_Init(void);
// 
// Description: This function initialises the synchronus serial channel to the sdcard. 
//                              
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
 
void SSC_Init(void)
{
        GPIO_InitTypeDef        GPIO_InitStructure;
        SSP_InitTypeDef         SSP_InitStructure;
        WIU_InitTypeDef         WIU_InitStructure;
        // enable APB clock for SPI1
        SCU_APBPeriphClockConfig(__SSP1 ,ENABLE);
        // configure P5.4 -> SD-CS as an output pin
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
        GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1;
        GPIO_Init (GPIO5, &GPIO_InitStructure);
        // configure P3.4 -> SCK1 and P3.6 -> MOSI1 as an output pin
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_6;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
        GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2;
        GPIO_Init (GPIO3, &GPIO_InitStructure);
        // configure P3.5 <- MISO1 as an input pin
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;
        GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;
        GPIO_Init (GPIO3, &GPIO_InitStructure);
        // configure SPI1
        SSP_DeInit(SSP1);
        SSP_StructInit(&SSP_InitStructure);
        SSP_InitStructure.SSP_FrameFormat = SSP_FrameFormat_Motorola;
        SSP_InitStructure.SSP_Mode = SSP_Mode_Master;
        SSP_InitStructure.SSP_CPHA = SSP_CPHA_1Edge;
        SSP_InitStructure.SSP_CPOL = SSP_CPOL_Low;
        // Set Baud Rate (Prescaler)
        // bit rate is BRCLK/SSP_ClockPrescaler/(1+SSP_ClockRate))
        // With MSCLK = 48MHz/2 = BRCLK we get for the SPICLK = 24Mhz / 8 / (1+5) = 500 kHz
        SSP_InitStructure.SSP_ClockRate = 5; //5
        SSP_InitStructure.SSP_ClockPrescaler = 8;
        SSP_Init(SSP1, &SSP_InitStructure);
        SSC_Disable();
        SSP_Cmd(SSP1, ENABLE);
 
        // Configure SD_SWITCH at pin GPIO5.3 as an external irq 11
 
        // configure the port
        SCU_APBPeriphClockConfig(__GPIO5, ENABLE); // Enable the GPIO5 Clock    
    GPIO_InitStructure.GPIO_Direction =         GPIO_PinInput;
    GPIO_InitStructure.GPIO_Pin =                       GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Type =                  GPIO_Type_PushPull ;
        GPIO_InitStructure.GPIO_IPConnected =   GPIO_IPConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate =     GPIO_InputAlt1;
    GPIO_Init(GPIO5, &GPIO_InitStructure);
       
        // configure the EXT11 interrupt line (P5.3) as an IRQ with the lowest priority
        SCU_APBPeriphClockConfig(__WIU, ENABLE);
        WIU_Cmd(ENABLE );
        WIU_ClearITPendingBit(WIU_Line11);
        WIU_DeInit();
        WIU_InitStructure.WIU_TriggerEdge = WIU_FallingEdge;
        WIU_InitStructure.WIU_Line = WIU_Line11;
        WIU_Init(&WIU_InitStructure);
        // The  EXTIT1_IRQHandler() is called every time the SD-Switch is activated (falling edge)
        // by inserting an sd-card
        SCU_WakeUpLineConfig(11);
    VIC_Config(EXTIT1_ITLine, VIC_IRQ, 7);
    VIC_ITCmd(EXTIT1_ITLine, ENABLE);
}
 
void SSC_Deinit(void)
{
        GPIO_InitTypeDef        GPIO_InitStructure;
 
        SSP_Cmd(SSP1, DISABLE);
        SSP_DeInit(SSP1);
 
        // configure P5.4 -> SD-CS as an input pin
        GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
        GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;
        GPIO_Init (GPIO5, &GPIO_InitStructure);
        // configure P3.4 -> SCK1 and P3.6 -> MOSI1 as an input pin
        GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_6;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
        GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;
        GPIO_Init (GPIO3, &GPIO_InitStructure);
        // configure P3.5 <- MISO1 as an input pin
        GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
        GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;
        GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;
        GPIO_Init (GPIO3, &GPIO_InitStructure);
 
        // disable APB clock for SPI1
        SCU_APBPeriphClockConfig(__SSP1 ,DISABLE);
 
        // configure the port of the SDC-Switch
        SCU_APBPeriphClockConfig(__GPIO5, ENABLE); // Enable the GPIO5 Clock    
    GPIO_InitStructure.GPIO_Direction =         GPIO_PinInput;
    GPIO_InitStructure.GPIO_Pin =                       GPIO_Pin_3;
        GPIO_InitStructure.GPIO_Type =                  GPIO_Type_PushPull ;
        GPIO_InitStructure.GPIO_IPConnected =   GPIO_IPConnected_Disable;
        GPIO_InitStructure.GPIO_Alternate =     GPIO_InputAlt1;
    GPIO_Init(GPIO5, &GPIO_InitStructure);
}
 
 
//________________________________________________________________________________________________________________________________________
// Function:    SSC_GetChar(void);
// 
// Description: This function reads one byte from the SSC
//                              
//
// Returnvalue: the byte received.
//________________________________________________________________________________________________________________________________________
 
u8 SSC_GetChar (void)
{
        u8 Byte = 0;
        while(SSP_GetFlagStatus(SSP1, SSP_FLAG_TxFifoNotFull) != SET);  // wait for space in the tx fifo
        SSP_SendData(SSP1, 0xFF);// send dymmy byte (0xFF) as master to receive a byte from the slave
        while(SSP_GetFlagStatus(SSP1, SSP_FLAG_TxFifoEmpty) != SET); // wait for the byte to be sent
        Byte = SSP_ReceiveData(SSP1); // read the byte transmitted from the slave
        return (Byte);
}
 
//________________________________________________________________________________________________________________________________________
void SSC_ClearRxFifo (void)
{
        // wait that the tx fifo is empty
        while(SSP_GetFlagStatus(SSP1, SSP_FLAG_TxFifoEmpty) != SET);
        // then empty the rx fifo by reading all the bytes that are available
        while(SSP_GetFlagStatus(SSP1, SSP_FLAG_RxFifoNotEmpty) == SET) SSP_ReceiveData(SSP1);
}
//________________________________________________________________________________________________________________________________________
// Function:    SSC_PutChar(u8 Byte);
// 
// Description: This function writes one byte to the SSC 
//                              
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
 
void SSC_PutChar (u8 Byte)
{
        // wait for some space in the tx fifo
        while(SSP_GetFlagStatus(SSP1, SSP_FLAG_TxFifoNotFull) != SET);
        // put the byte to send in the tx fifo
        SSP_SendData(SSP1, Byte);
}
 
 
 
 
 
 
 
 
 
Subversion Repositories NaviCtrl

(root)/tags/V0.28m/ssc.c @ 720 - Rev 24 → 41
