spi.h

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#pragma once
#include "deviceio.h"
#include "gpio.h"
#include <stdbool.h>
#include <stdint.h>

// TYPES

typedef enum {
  hw_spi_mode_0 =
      0, 
  hw_spi_mode_1 =
      1, 
  hw_spi_mode_2 =
      2, 
  hw_spi_mode_3 =
      3, 
} hw_spi_mode_t;

typedef struct {
  bool cs_active_low;    
  hw_spi_mode_t mode;    
  uint8_t bits_per_word; 
} hw_spi_config_t;

// LIFECYCLE

hw_deviceio_t *hw_spi_init_default(uint32_t baud_rate,
                                   const hw_spi_config_t *config);

hw_deviceio_t *hw_spi_init(uint8_t index, hw_gpio_t *sck_pin,
                           hw_gpio_t *tx_pin, hw_gpio_t *rx_pin,
                           hw_gpio_t *cs_pin, uint32_t baud_rate,
                           const hw_spi_config_t *config);

hw_deviceio_t *hw_spi_init_device(const char *device, uint32_t baud_rate,
                                  const hw_spi_config_t *config);

// PROPERTIES

uint8_t hw_spi_count(void);