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#ifndef SPI_INTERFACE_H_
#define SPI_INTERFACE_H_
#include <util/crc16.h>
/* Button coprocessor wire protocol */
enum spi_commands {
/* No operation */
SPI_CONTROL_NOP,
/* Application identification */
SPI_CONTROL_TESTAPP,
/* Data fetch commands */
SPI_CONTROL_GETLOW,
SPI_CONTROL_GETHIGH,
SPI_CONTROL_GETENC,
SPI_CONTROL_GETSUM,
/* Bootloader related commands */
SPI_CONTROL_ENTERBOOT = 0xA0, /* Enter the bootloader */
SPI_CONTROL_ENTERBOOT2, /* Enter the bootloader (second stage) */
SPI_CONTROL_ENTERAPP, /* Enter the application */
SPI_CONTROL_STARTFLASH, /* Begin flashing sequence */
};
enum spi_result {
SPI_RESULT_OK = 0xFA,
SPI_RESULT_FAIL = 0x8A,
};
#define SPI_SLAVE_TRANSIRQ_DDR DDRB
#define SPI_SLAVE_TRANSIRQ_PORT PORTB
#define SPI_SLAVE_TRANSIRQ_PIN PINB
#define SPI_SLAVE_TRANSIRQ_BIT 6
#define SPI_MASTER_TRANSIRQ_DDR DDRD
#define SPI_MASTER_TRANSIRQ_PORT PORTD
#define SPI_MASTER_TRANSIRQ_PIN PIND
#define SPI_MASTER_TRANSIRQ_BIT 2
#define SPI_MASTER_TRANSIRQ_INT INT0
#define SPI_MASTER_TRANSIRQ_INTF INTF0
#define SPI_MASTER_TRANSIRQ_VECT INT0_vect
static inline uint8_t spi_crc8(uint8_t crc, uint8_t data)
{
return _crc_ibutton_update(crc, data);
}
#endif /* SPI_INTERFACE_H_ */
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