00001 /* General support for SPI devices, but using bit banging and 00002 using pin definitions rather than the built in spi functions in the microcontroller. 00003 00004 No specific initialisation is needed except port directions. 00005 00006 00007 requires definitions of ATMEL ports: 00008 00009 SPI_PORT Port for the SPI signals eg PORTB 00010 SPI_DDR DDR for the SPI signals eg DDRB 00011 SPI_PIN Input Port for the SPI signals eg PINB 00012 00013 SPI_SCK Clock from master to slave 00014 SPI_MOSI Data from Master to slave 00015 SPI_MISO Data from slave to master 00016 00017 SPI mode 0 where data to slave is latched on leading edge of SCK, and data 00018 from slave to master is latched by master on fallling edge of SCK 00019 00020 Uses delay functions which require definition of F_CPU in config.h 00021 00022 */ 00023 00024 00025 00026 /* 17/2/2012 svn 507 */ 00027 00028 #ifndef SPI_H 00029 #define SPI_H 00030 00031 00032 #include <avr/io.h> 00033 #include <config.h> 00034 00035 00036 00037 inline void spi_clock_up_down(void); 00038 00039 00040 00047 uint8_t read_spi_byte(void); 00048 00049 00050 00057 uint16_t read_spi_2byte(void); 00058 00059 00060 00067 void write_spi_byte(uint8_t data); 00068 00069 00070 00077 void write_spi_2byte(uint16_t data); 00078 00079 00080 #endif
1.7.1