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/*#######################################################################################*/
/* !!! 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.
// + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt
// + bzgl. der Nutzungsbedingungen aufzunehmen.
// + 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
// + mit unserer Zustimmung zulässig
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Redistributions of source code (with or without modifications) must retain the above copyright notice,
// + this list of conditions and the following disclaimer.
// +   * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived
// +     from this software without specific prior written permission.
// +   * The use of this project (hardware, software, binary files, sources and documentation) is only permitted
// +     for non-commercial use (directly or indirectly)
// +     Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted
// +     with our written permission
// +   * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be
// +     clearly linked as origin
// +   * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed
//
// +  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// +  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// +  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// +  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// +  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// +  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// +  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// +  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// +  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// +  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// +  POSSIBILITY OF SUCH DAMAGE.
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#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);
}