xyFC/include/arm/spi.h

/*
 * Bit-Banged SPI routines
 */

#ifndef _ARM_SPI_H
#define _ARM_SPI_H

#include <stdint.h>

#define DIR_OUTPUT 0
#define DIR_INPUT 1

void gpioInit(void);
void gpioDir(uint8_t num, uint8_t dir);
void gpioSet(uint8_t num, uint8_t val);
uint8_t gpioGet(uint8_t num);

#define SCK_on gpioSet(22, 1)
#define SCK_off gpioSet(22, 0)
#define SCK_dir gpioDir(22, DIR_OUTPUT)

#define MO_on gpioSet(21, 1)
#define MO_off gpioSet(21, 0)
#define MO_dir gpioDir(21, DIR_OUTPUT)

#define CS_on gpioSet(24, 1)
#define CS_off gpioSet(24, 0)
#define CS_dir gpioDir(24, DIR_OUTPUT)

#define MI_1 gpioGet(23)
#define MI_0 gpioGet(23)
#define MI_dir gpioDir(23, DIR_INPUT)

#define GDO_1 gpioGet(25)
#define GDO_0 gpioGet(25)
#define GDO_dir gpioDir(25, DIR_INPUT)

#define NOP() __asm__ __volatile__("nop\n\t" \
                                   "nop\n\t" \
                                   "nop\n\t" \
                                   "nop\n\t" \
                                   "nop\n\t" \
                                   "nop\n\t")

#endif