i2c.h

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

// TYPES

typedef struct hw_i2c_t {
  uint8_t adapter;     
  hw_gpio_t sda;       
  hw_gpio_t scl;       
  uint32_t baudrate;   
  uint8_t reserved[3]; 
} hw_i2c_t;

// LIFECYCLE

hw_i2c_t hw_i2c_init_default(uint32_t baudrate);

hw_i2c_t hw_i2c_init(uint8_t adapter, uint8_t sda, uint8_t scl,
                     uint32_t baudrate);

void hw_i2c_finalize(hw_i2c_t *i2c);

// PROPERTIES

uint8_t hw_i2c_count(void);

static inline bool hw_i2c_valid(hw_i2c_t *i2c) {
  return i2c && i2c->baudrate > 0;
}

// METHODS

bool hw_i2c_detect(hw_i2c_t *i2c, uint8_t addr);

size_t hw_i2c_xfr(hw_i2c_t *i2c, uint8_t addr, void *data, size_t tx, size_t rx,
                  uint32_t timeout_ms);

size_t hw_i2c_read(hw_i2c_t *i2c, uint8_t addr, uint8_t reg, void *data,
                   size_t len, uint32_t timeout_ms);

size_t hw_i2c_write(hw_i2c_t *i2c, uint8_t addr, uint8_t reg, const void *data,
                    size_t len, uint32_t timeout_ms);