i2c_bus.c

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#include "i2c_bus.h"
 
#include "esp_check.h"
#include "esp_log.h"
 
static const char *TAG = "i2c_bus";
 
static i2c_master_bus_handle_t s_bus;
static bool s_initialized;
 
esp_err_t i2c_bus_init(void)
{
    if (s_initialized) {
        return ESP_OK;
    }
 
    i2c_master_bus_config_t bus_cfg = {
        .i2c_port = I2C_BUS_PORT,
        .sda_io_num = I2C_BUS_SDA_GPIO,
        .scl_io_num = I2C_BUS_SCL_GPIO,
        .clk_source = I2C_CLK_SRC_DEFAULT,
        .glitch_ignore_cnt = 7,
        .flags.enable_internal_pullup = true,
    };
    ESP_RETURN_ON_ERROR(i2c_new_master_bus(&bus_cfg, &s_bus), TAG, "i2c_new_master_bus failed");
 
    s_initialized = true;
    ESP_LOGI(TAG, "I2C master bus ready: SCL=GPIO%d SDA=GPIO%d @ %u Hz",
             I2C_BUS_SCL_GPIO, I2C_BUS_SDA_GPIO, I2C_BUS_FREQ_HZ);
    return ESP_OK;
}
 
i2c_master_bus_handle_t i2c_bus_handle(void)
{
    return s_bus;
}
 
esp_err_t i2c_bus_add_device(uint8_t addr7, i2c_master_dev_handle_t *dev)
{
    ESP_RETURN_ON_FALSE(s_initialized, ESP_ERR_INVALID_STATE, TAG, "bus not initialized");
    ESP_RETURN_ON_FALSE(dev != NULL, ESP_ERR_INVALID_ARG, TAG, "null dev");
 
    i2c_device_config_t dev_cfg = {
        .dev_addr_length = I2C_ADDR_BIT_LEN_7,
        .device_address = addr7,
        .scl_speed_hz = I2C_BUS_FREQ_HZ,
    };
    ESP_RETURN_ON_ERROR(i2c_master_bus_add_device(s_bus, &dev_cfg, dev),
                        TAG, "add device 0x%02X failed", addr7);
 
    ESP_LOGI(TAG, "Added device 0x%02X", addr7);
    return ESP_OK;
}