spi.h

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

// TYPES

typedef struct hw_spi_t {
  uint8_t adapter;     
  hw_gpio_t sck;       
  hw_gpio_t tx;        
  hw_gpio_t rx;        
  hw_gpio_t cs;        
  bool cs_active;      
  uint32_t baudrate;   
  uint8_t reserved[3]; 
} hw_spi_t;

// LIFECYCLE

hw_spi_t hw_spi_init_default(bool cs_active_low, uint32_t baudrate);

hw_spi_t hw_spi_init(uint8_t adapter, uint8_t sck, uint8_t tx, uint8_t rx,
                     uint8_t cs, bool cs_active_low, uint32_t baudrate);

void hw_spi_finalize(hw_spi_t *spi);

// PROPERTIES

uint8_t hw_spi_count(void);

static inline bool hw_spi_valid(hw_spi_t *spi) {
  return spi && spi->baudrate > 0;
}

// DATA TRANSFER

size_t hw_spi_xfr(hw_spi_t *spi, void *data, size_t tx, size_t rx);

size_t hw_spi_read(hw_spi_t *spi, uint8_t reg, void *data, size_t len);

size_t hw_spi_write(hw_spi_t *spi, uint8_t reg, const void *data, size_t len);