ESP-Miner/main/i2c_master.c

#include "i2c_master.h"

#define I2C_MASTER_SCL_IO 48        /*!< GPIO number used for I2C master clock */
#define I2C_MASTER_SDA_IO 47        /*!< GPIO number used for I2C master data  */
#define I2C_MASTER_FREQ_HZ 400000   /*!< I2C master clock frequency */
#define I2C_MASTER_TX_BUF_DISABLE 0 /*!< I2C master doesn't need buffer */
#define I2C_MASTER_RX_BUF_DISABLE 0 /*!< I2C master doesn't need buffer */

/**
 * @brief i2c master initialization
 */
esp_err_t i2c_master_init(void)
{
    int i2c_master_port = I2C_MASTER_NUM;

    i2c_config_t conf = {
        .mode = I2C_MODE_MASTER,
        .sda_io_num = I2C_MASTER_SDA_IO,
        .scl_io_num = I2C_MASTER_SCL_IO,
        .sda_pullup_en = GPIO_PULLUP_ENABLE,
        .scl_pullup_en = GPIO_PULLUP_ENABLE,
        .master.clk_speed = I2C_MASTER_FREQ_HZ,
    };

    i2c_param_config(i2c_master_port, &conf);

    return i2c_driver_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
}

/**
 * @brief i2c master delete
 */
esp_err_t i2c_master_delete(void)
{
    return i2c_driver_delete(I2C_MASTER_NUM);
}

/**
 * @brief Read a sequence of I2C bytes
 */
esp_err_t i2c_master_register_read(uint8_t device_address, uint8_t reg_addr, uint8_t * data, size_t len)
{
    return i2c_master_write_read_device(I2C_MASTER_NUM, device_address, &reg_addr, 1, data, len,
                                        I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);
}

/**
 * @brief Write a byte to a I2C register
 */
esp_err_t i2c_master_register_write_byte(uint8_t device_address, uint8_t reg_addr, uint8_t data)
{
    int ret;
    uint8_t write_buf[2] = {reg_addr, data};

    ret = i2c_master_write_to_device(I2C_MASTER_NUM, device_address, write_buf, sizeof(write_buf),
                                     I2C_MASTER_TIMEOUT_MS / portTICK_PERIOD_MS);

    return ret;
}