A small library to manage Adafruit L3GD20H 3D Gyroscope for ESP-IDF, tested on ESP32 Dev Kit.
https://www.adafruit.com/product/1032
- L3GD20H SCL -> ESP32 D22
- L3GD20H SDA -> ESP32 D21
ESP-IDf I2C is initialized using i2c_master_init function:
static esp_err_t i2c_master_init()
{
int i2c_master_port = 0;
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = I2C_MASTER_SDA_IO;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_io_num = I2C_MASTER_SCL_IO;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.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);
}
I2C Data is sent i2c_master_write_slave:
static esp_err_t i2c_master_write_slave(i2c_port_t i2c_num, uint8_t *data_wr, size_t size)
{
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (L3GD20_ADDRESS << 1) | WRITE_BIT, ACK_CHECK_EN);
i2c_master_write(cmd, data_wr, size, ACK_CHECK_EN);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(i2c_num, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
return ret;
}
I2C Data is read via i2c_master_read_slave:
static esp_err_t i2c_master_read_slave(i2c_port_t i2c_num, uint8_t *data_rd, size_t size)
{
if (size == 0)
{
return ESP_OK;
}
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (L3GD20_ADDRESS << 1) | READ_BIT, ACK_CHECK_EN);
if (size > 1)
{
i2c_master_read(cmd, data_rd, size - 1, ACK_VAL);
}
i2c_master_read_byte(cmd, data_rd + size - 1, NACK_VAL);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(i2c_num, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
return ret;
}