Форум РадиоКот

Код: Выделить всё

// speed const
#define GPIO_SPEED_high 0b00
// out_mode digital mode
#define GPIO_MODE_TOTEM        0b000

#define SD_CLK_PIN  E,7,GPIO_SPEED_high,GPIO_MODE_TOTEM
#define SD_DO_PIN   E,6,GPIO_SPEED_high,GPIO_MODE_TOTEM
#define SD_DI_PIN   E,5,GPIO_SPEED_high,GPIO_MODE_TOTEM
#define SD_CS_PIN   F,1,GPIO_SPEED_high,GPIO_MODE_TOTEM
#define SD_SPI      SPIE

#define _GPIO_INIT_OUT_MODE(port_char,port_pin_no,port_speed,port_mode) \
                PORT##port_char.DIRSET = (1<<(port_pin_no)); \
                PORT##port_char.PIN##port_pin_no##CTRL  = ((port_speed) << 6)|((port_mode)<<3)
#define GPIO_INIT_OUT_MODE(port_def) _GPIO_INIT_OUT_MODE(port_def)

#define GPIO_SET_VAL_L(port_ch,port_pin_no,port_speed,port_mode) \
                PORT##port_ch.OUTCLR  = (1 << (port_pin_no))
#define GPIO_SET_VAL_H(port_ch,port_pin_no,port_speed,port_mode) \
                PORT##port_ch.OUTSET = (1 << (port_pin_no))
#define GPIO_SET_VAL(port_def,port_val) GPIO_SET_VAL_##port_val(port_def)

void sd_init_spi(uint8_t high_speed)
{
  SD_SPI.CTRL &= ~SPI_ENABLE_bm;

  SD_SPI.CTRL = SPI_MODE_0_gc
              //| SPI_PRESCALER_DIV128_gc  // 32MHz/128 = 250kHz
                //| SPI_DORD_bm  // Data Order Setting
              | SPI_MASTER_bm; // Master Operation
  if( 0 == high_speed ) SD_SPI.CTRL |= SPI_PRESCALER_DIV128_gc; // 32MHz/128 = 250kHz
  else SD_SPI.CTRL |= SPI_PRESCALER_DIV4_gc|SPI_CLK2X_bm;// 8MHz ;  Enable Double Speed 16MHz

  SD_SPI.CTRL |= SPI_ENABLE_bm; //  Enable Module
}

void sd_init_gpio(void)
{
  GPIO_INIT_OUT_MODE(SD_CS_PIN);
  GPIO_INIT_OUT_MODE(SD_CLK_PIN);
  GPIO_INIT_OUT_MODE(SD_DI_PIN);
  GPIO_SET_VAL(SD_CS_PIN,H);
}

uint8_t SD_IO(uint8_t data)
{
  SD_SPI.DATA = data;
  while( 0 == (SD_SPI.STATUS & SPI_IF_bm) );
  return SD_SPI.DATA;
}