test/spi.h

   1 #ifndef SPI_H_
   2 #define SPI_H_
   3
   4 #include <inttypes.h>
   5 #include <avr/io.h>
   6
   7 #define SPIPORT PORTB
   8 #define SPIPIN  PINB
   9 #define SPIDDR  DDRB
  10
  11 #if defined(__AVR_ATmega8__)
  12 #define SPISCK   PB5
  13 #define SPIMISO  PB4
  14 #define SPIMOSI  PB3
  15 #define SPISS    PB2
  16 #elif defined(__AVR_ATmega32__) || defined(__AVR_ATmega16__) || defined(__AVR_ATmega162__)
  17 #define SPISCK   PB7
  18 #define SPIMISO  PB6
  19 #define SPIMOSI  PB5
  20 #define SPISS    PB4
  21 #else
  22 #error "SPI pins undefined for this target"
  23 #endif
  24
  25 #define SPI_SS_HIGH() (SPIPORT |= (1<<SPISS))
  26 #define SPI_SS_LOW() (SPIPORT &= ~(1<<SPISS))
  27
  28 void spi_init(void);
  29 uint8_t spi_readwrite(uint8_t data);
  30 void spi_write(uint8_t data);
  31 uint8_t spi_read(void);
  32
  33 #endif
  34