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| #include <avr/io.h> |
| #include "fat16.h" |
| #include "ssc.h" |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Module name: fat16.c |
| // Compiler used: avr-gcc 3.4.5 |
| // Last Modifikation: 24.07.2007 |
| // Version: 1.03 |
| // Authors: Stephan Busker |
| // Description: Source files for access to the synchrnous serial channel. |
| // Copyright (C) 2007 Stephan Busker |
| //........................................................................................................................................ |
| // 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); |
| //........................................................................................................................................ |
| // ext. functions: extern u8 SDC_GetSector (u32,u8*); |
| // extern u8 SDC_PutSector (u32,u8*); |
| //........................................................................................................................................ |
| // |
| // URL: www.Mikro-Control.de |
| // mailto: stephan.busker@mikro-control.de |
| //________________________________________________________________________________________________________________________________________ |
| |
| |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Funtion: SSC_Init(void); |
| // |
| // Description: This function initialises the synchronus serial channel to the sdcard. |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_Init(void) |
| { |
| MMC_Direction_REG &=~(1<<SPI_DI); // Set the direction of the ssc-port |
| MMC_Direction_REG |= (1<<SPI_Clock); // _______ _______ |
| MMC_Direction_REG |= (1<<SPI_DO); // CS \________________________/ |
| MMC_Direction_REG |= (1<<MMC_Chip_Select); // |
| MMC_Direction_REG |= (1<<SPI_SS); // ___ ___ ___ |
| // clk __________/ \___/ \___/ \_________ |
| // |
| SSC_Disable(); // ___ ___ |
| // data_________/ \___________/ \___________ |
| |
| // initialise ssc, clock = Idel low |
| // devide clock by 32 |
| SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(1<<CPOL); // Enable SSC in mastermode, invert clockpolarity (idle high) |
| SPSR = SPSR|(1<<SPI2X); |
| } |
| |
| |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Funtion: void SSC_ClearRxFifo(void); |
| // |
| // Description: Clears the fifo of the ssc if the controller used has a builtin fifo. |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| |
| void SSC_ClearRxFifo(void) |
| { |
| // enter your code here to clear the rx-fifo of the ssc. |
| } |
| |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Funtion: SSC_GetChar(void); |
| // |
| // Description: This function reads one byte from the SSC |
| // |
| // |
| // Returnvalue: the byte received. |
| //________________________________________________________________________________________________________________________________________ |
| |
| u8 SSC_GetChar (void) |
| { |
| u8 Byte = 0; |
| |
| SPDR = 0x00; // read one byte of data from the SSC |
| while(!(SPSR & (1<<SPIF))){}; // wait until the data has been read. |
| Byte = SPDR; |
| |
| #ifdef __MMC_INTERFACE_INVERTED |
| return (~Byte); |
| #else |
| return (Byte); // the byte received |
| #endif |
| |
| |
| } |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Funtion: SSC_PutChar(u8 Byte); |
| // |
| // Description: This function writes one byte to the SSC |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_PutChar (u8 Byte) |
| { |
| #ifdef __MMC_INTERFACE_INVERTED |
| SPDR = ~Byte; // send one byte of data to the SSC |
| #else |
| SPDR = Byte; // send one byte of data to the SSC |
| #endif |
| SPDR = ~Byte; // send one byte of data to the SSC |
| while(!(SPSR & (1<<SPIF))) // wait until data was send. |
| { |
| } |
| } |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Funtion: SSC_Disable(void); |
| // |
| // Description: This function enables chipselect of the sdcard (active low) |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_Disable(void) |
| { |
| #ifdef __MMC_INTERFACE_INVERTED |
| MMC_Write &= ~(1<<MMC_Chip_Select); // disable chipselect of the sdcard (active low). |
| #else |
| MMC_Write |= (1<<MMC_Chip_Select); // enable chipselect of the sdcard (active low). |
| #endif |
| } |
| |
| |
| |
| |
| //________________________________________________________________________________________________________________________________________ |
| // Funtion: SSC_Enable(void); |
| // |
| // Description: This function disables chipselect of the sdcard (active low) |
| // |
| // |
| // Returnvalue: none |
| //________________________________________________________________________________________________________________________________________ |
| |
| void SSC_Enable(void) |
| { |
| #ifdef __MMC_INTERFACE_INVERTED |
| MMC_Write |= (1<<MMC_Chip_Select); // enable chipselect of the sdcard (active low). |
| #else |
| MMC_Write &= ~(1<<MMC_Chip_Select); // disable chipselect of the sdcard (active low). |
| #endif |
| } |
| |