| 0,0 → 1,216 |
|---|
| #include <avr/io.h> |
| #include "ssc.h" |
| |
| //-------------------------------------- Hardware specific definitions -------------------------------------- |
| #define PORTR_SPI PINB |
| #define PORTW_SPI PORTB //Port to which the sd-card is connected (SPI Port) |
| #define PORT_MISO PORTB6 //Port Pin that is connected to the DO of the MMC/SD-card |
| #define PORT_MOSI PORTB5 //Port Pin that is connected to DI of the MMC/SD-card |
| #define PORT_SCK PORTB7 //Port Pin that is connected the CLK of the MMC/SD-card |
| #define PORT_SS PORTB4 //Slave Select is not used in SPI Master Mode, but must be defined |
| #define PORT_CS PORTB4 //Port Pin that is connected to /CS of the MMC/SD-Karte |
| |
| |
| #ifdef USE_SDLOGGER |
| #define __SD_INTERFACE_INVERTED // the interface between the controller and the SD-card uses an inverting leveltranslator (transistorinverter) |
| #endif // and therefore the signals to or from the memorycard have to be inverted. |
| |
| #ifdef USE_FOLLOWME // uses resitors, therefore its not inverted |
| //#define __SD_INTERFACE_INVERTED // the interface between the controller and the MMC/SD-card uses an inverting leveltranslator (transistorinverter) |
| #endif |
| |
| #define DDR_SPI DDRB |
| #define DD_MISO DDB6 //Port Pin that is connected to the DO of the MMC/SD-card |
| #define DD_MOSI DDB5 //Port Pin that is connected to DI of the MMC/SD-card |
| #define DD_SCK DDB7 //Port Pin that is connected the CLK of the MMC/SD-card |
| #define DD_SS DDB4 //Slave Select is not used in SPI Master Mode, but must be defined |
| #define DD_CS DDB4 //Port Pin that is connected to /CS of the MMC/SD-Karte |
| |
| // for compatibility reasons gcc3.x <-> gcc4.x |
| #ifndef SPCR |
| #define SPCR SPCR0 |
| #endif |
| #ifndef SPIE |
| #define SPIE SPIE0 |
| #endif |
| #ifndef SPE |
| #define SPE SPE0 |
| #endif |
| #ifndef DORD |
| #define DORD DORD0 |
| #endif |
| #ifndef MSTR |
| #define MSTR MSTR0 |
| #endif |
| #ifndef CPOL |
| #define CPOL CPOL0 |
| #endif |
| #ifndef CPHA |
| #define CPHA CPHA0 |
| #endif |
| #ifndef SPR1 |
| #define SPR1 SPR01 |
| #endif |
| #ifndef SPR0 |
| #define SPR0 SPR00 |
| #endif |
| |
| #ifndef SPDR |
| #define SPDR SPDR0 |
| #endif |
| |
| #ifndef SPSR |
| #define SPSR SPSR0 |
| #endif |
| #ifndef SPIF |
| #define SPIF SPIF0 |
| #endif |
| #ifndef WCOL |
| #define WCOL WCOL0 |
| #endif |
| #ifndef SPI2X |
| #define SPI2X SPI2X0 |
| #endif |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Function: SSC_Init(void); |
| // |
| // Description: This function initialises the synchronus serial channel to the sdcard. |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_Init(void) |
| { |
| // Set MOSI,SCK and CS as output |
| DDR_SPI |= (1<<DD_MOSI)|(1<<DD_SCK)|(1<<DD_CS); |
| // set MISO as input |
| DDR_SPI &= ~(1<<DD_MISO); |
| |
| SSC_Disable(); |
| |
| // 20MHz / 32 = 625 kHz |
| #ifdef __SD_INTERFACE_INVERTED |
| SPCR = (1<<SPE)|(1<<MSTR)|(0<<DORD)|(1<<CPOL)|(0<<CPHA)|(1<<SPR1)|(0<<SPR0); // Enable SSC in mastermode, inverted clockpolarity (idle high) |
| #else |
| SPCR = (1<<SPE)|(1<<MSTR)|(0<<DORD)|(0<<CPOL)|(0<<CPHA)|(1<<SPR1)|(0<<SPR0); // Enable SSC in mastermode, noninverted clockpolarity (idle low) |
| #endif |
| SPSR |= (1<<SPI2X); |
| |
| // set port pin as input pullup for SD-Card switch |
| #ifdef USE_FOLLOWME |
| PORTB |= (1 << PORTB2); |
| DDRB &= ~(1 << DDB2); |
| #endif |
| |
| #ifdef USE_SDLOGGER |
| PORTB |= (1 << PORTB3); |
| DDRB &= ~(1 << DDB3); |
| #endif |
| } |
| |
| void SSC_Deinit(void) |
| { |
| SSC_Disable(); |
| SPCR = 0; |
| SPSR = 0; |
| } |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Function: SSC_GetChar(void); |
| // |
| // Description: This function reads one byte from the SSC |
| // |
| // |
| // Returnvalue: the byte received. |
| //________________________________________________________________________________________________________________________________________ |
| |
| uint8_t SSC_GetChar (void) |
| { |
| uint8_t Byte = 0; |
| |
| #ifdef __SD_INTERFACE_INVERTED |
| SPDR = 0x00; // send dummy byte to initiate the reading |
| #else |
| SPDR = 0xFF; // send dummy byte to initiate the reading |
| #endif |
| while(!(SPSR & (1<<SPIF))) |
| { |
| // wait until the data has been read. |
| } |
| Byte = SPDR; |
| |
| #ifdef __SD_INTERFACE_INVERTED |
| Byte = ~Byte; |
| #endif |
| |
| return(Byte); |
| } |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Function: SSC_PutChar(u8 Byte); |
| // |
| // Description: This function writes one byte to the SSC |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_PutChar (uint8_t Byte) |
| { |
| |
| #ifdef __SD_INTERFACE_INVERTED |
| SPDR = ~Byte; // send one byte of data to the SSC |
| #else |
| SPDR = Byte; // send one byte of data to the SSC |
| #endif |
| while(!(SPSR & (1<<SPIF))) |
| { |
| // wait until the data has been sent. |
| } |
| } |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Function: SSC_Disable(void); |
| // |
| // Description: This function enables chipselect of the sdcard (active low) |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_Disable(void) |
| { |
| #ifdef __SD_INTERFACE_INVERTED |
| PORTW_SPI &= ~(1<<PORT_CS); // disable chipselect of the sdcard (active low). |
| #else |
| PORTW_SPI |= (1<<PORT_CS); // disable chipselect of the sdcard (active low). |
| #endif |
| } |
| |
| |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Function: SSC_Enable(void); |
| // |
| // Description: This function disables chipselect of the sdcard (active low) |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_Enable(void) |
| { |
| #ifdef __SD_INTERFACE_INVERTED |
| PORTW_SPI |= (1<<PORT_CS); // enable chipselect of the sdcard (active low). |
| #else |
| PORTW_SPI &= ~(1<<PORT_CS); // enable chipselect of the sdcard (active low). |
| #endif |
| } |
| |
| |