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428 killagreg 1
#include <avr/io.h>
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#include "ssc.h"
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//-------------------------------------- Hardware specific definitions --------------------------------------
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#define PORTR_SPI                       PINB
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#define PORTW_SPI                       PORTB           //Port to which the sd-card is connected (SPI Port)
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#define PORT_MISO                       PORTB6          //Port Pin that is connected to the DO of the MMC/SD-card
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#define PORT_MOSI                       PORTB5          //Port Pin that is connected to  DI of the MMC/SD-card
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#define PORT_SCK                        PORTB7          //Port Pin that is connected the CLK of the MMC/SD-card
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#define PORT_SS                         PORTB4          //Slave Select is not used in SPI Master Mode, but must be defined
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#define PORT_CS                         PORTB4          //Port Pin that is connected to /CS of the MMC/SD-Karte
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#ifdef USE_SDLOGGER
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#define __SD_INTERFACE_INVERTED         // the interface between the controller and the SD-card uses an inverting leveltranslator (transistorinverter)
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#endif                                                          // and therefore the signals to or from the memorycard have to be inverted.
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#ifdef USE_FOLLOWME                                     // uses resitors, therefore its not inverted
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//#define       __SD_INTERFACE_INVERTED // the interface between the controller and the MMC/SD-card uses an inverting leveltranslator (transistorinverter)
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#endif
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#define DDR_SPI                         DDRB
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#define DD_MISO                         DDB6            //Port Pin that is connected to the DO of the MMC/SD-card
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#define DD_MOSI                         DDB5            //Port Pin that is connected to  DI of the MMC/SD-card
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#define DD_SCK                          DDB7            //Port Pin that is connected the CLK of the MMC/SD-card
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#define DD_SS                           DDB4            //Slave Select is not used in SPI Master Mode, but must be defined
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#define DD_CS                           DDB4            //Port Pin that is connected to /CS of the MMC/SD-Karte
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// for compatibility reasons gcc3.x <-> gcc4.x
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#ifndef SPCR
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#define SPCR   SPCR0
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#endif
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#ifndef SPIE
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#define SPIE   SPIE0
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#endif
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#ifndef SPE
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#define SPE    SPE0
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#endif
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#ifndef DORD
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#define DORD   DORD0
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#endif
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#ifndef MSTR
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#define MSTR   MSTR0
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#endif
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#ifndef CPOL
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#define CPOL   CPOL0
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#endif
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#ifndef CPHA
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#define CPHA   CPHA0
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#endif
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#ifndef SPR1
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#define SPR1   SPR01
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#endif
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#ifndef SPR0
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#define SPR0   SPR00
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#endif
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#ifndef SPDR
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#define SPDR   SPDR0
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#endif
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#ifndef SPSR
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#define SPSR   SPSR0
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#endif
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#ifndef SPIF
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#define SPIF   SPIF0
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#endif
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#ifndef WCOL
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#define WCOL   WCOL0
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#endif
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#ifndef SPI2X
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#define SPI2X  SPI2X0
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#endif
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//________________________________________________________________________________________________________________________________________
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// Function:    SSC_Init(void);
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//
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// Description: This function initialises the synchronus serial channel to the sdcard.
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//
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//
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// Returnvalue: none
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//________________________________________________________________________________________________________________________________________
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void SSC_Init(void)
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{
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        // Set MOSI,SCK and CS as output
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        DDR_SPI |= (1<<DD_MOSI)|(1<<DD_SCK)|(1<<DD_CS);
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        // set MISO as input
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        DDR_SPI &= ~(1<<DD_MISO);
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        SSC_Disable();
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        // 20MHz / 32 = 625 kHz
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        #ifdef __SD_INTERFACE_INVERTED
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        SPCR = (1<<SPE)|(1<<MSTR)|(0<<DORD)|(1<<CPOL)|(0<<CPHA)|(1<<SPR1)|(0<<SPR0);    // Enable SSC in mastermode, inverted clockpolarity (idle high)
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        #else
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        SPCR = (1<<SPE)|(1<<MSTR)|(0<<DORD)|(0<<CPOL)|(0<<CPHA)|(1<<SPR1)|(0<<SPR0);    // Enable SSC in mastermode, noninverted clockpolarity (idle low)
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        #endif
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        SPSR |= (1<<SPI2X);
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        // set port pin as input pullup for SD-Card switch
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        #ifdef USE_FOLLOWME
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        PORTB |= (1 << PORTB2);
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        DDRB &= ~(1 << DDB2);
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        #endif
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        #ifdef USE_SDLOGGER
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        PORTB |= (1 << PORTB3);
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        DDRB &= ~(1 << DDB3);
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        #endif
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}
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void    SSC_Deinit(void)
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{
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        SSC_Disable();
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        SPCR = 0;
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        SPSR = 0;
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}
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//________________________________________________________________________________________________________________________________________
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// Function:    SSC_GetChar(void);
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//
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// Description: This function reads one byte from the SSC
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//
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//
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// Returnvalue: the byte received.
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//________________________________________________________________________________________________________________________________________
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uint8_t SSC_GetChar (void)
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{
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        uint8_t Byte = 0;
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        #ifdef __SD_INTERFACE_INVERTED
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        SPDR = 0x00;                                                                            // send dummy byte to initiate the reading
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        #else
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        SPDR = 0xFF;                                                                            // send dummy byte to initiate the reading
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        #endif
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        while(!(SPSR & (1<<SPIF)))
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        {
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                // wait until the data has been read.
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        }
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        Byte = SPDR;
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        #ifdef __SD_INTERFACE_INVERTED
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        Byte = ~Byte;
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        #endif
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        return(Byte);
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}
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//________________________________________________________________________________________________________________________________________
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// Function:    SSC_PutChar(u8 Byte);
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//
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// Description: This function writes one byte to the SSC
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//
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//
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// Returnvalue: none
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//________________________________________________________________________________________________________________________________________
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void SSC_PutChar (uint8_t Byte)
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{
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        #ifdef __SD_INTERFACE_INVERTED
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        SPDR = ~Byte;                                                                           // send one byte of data to the SSC
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        #else
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        SPDR =  Byte;                                                                           // send one byte of data to the SSC
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        #endif
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        while(!(SPSR & (1<<SPIF)))
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        {
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                // wait until the data has been sent.
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        }
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}
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//________________________________________________________________________________________________________________________________________
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// Function:    SSC_Disable(void);
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//
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// Description: This function enables chipselect of the sdcard (active low)
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//
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//
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// Returnvalue: none
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//________________________________________________________________________________________________________________________________________
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void SSC_Disable(void)
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{
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        #ifdef __SD_INTERFACE_INVERTED
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        PORTW_SPI &= ~(1<<PORT_CS);                                     // disable chipselect of the sdcard (active low).
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        #else
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        PORTW_SPI |= (1<<PORT_CS);                                      // disable chipselect of the sdcard (active low).
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        #endif
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}
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//________________________________________________________________________________________________________________________________________
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// Function:    SSC_Enable(void);
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//
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// Description: This function disables chipselect of the sdcard (active low)
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//
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//
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// Returnvalue: none
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//________________________________________________________________________________________________________________________________________
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void SSC_Enable(void)
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{
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        #ifdef __SD_INTERFACE_INVERTED
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        PORTW_SPI |= (1<<PORT_CS);                                      // enable chipselect of the sdcard (active low).
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        #else
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        PORTW_SPI &= ~(1<<PORT_CS);                                     // enable chipselect of the sdcard (active low).
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        #endif
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}
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