Function start

Drivers/qmi8658-module/source/qmi8658.cpp:39–72

// region Driver lifecycle

static error_t start(Device* device) {
    auto* i2c_controller = device_get_parent(device);
    if (device_get_type(i2c_controller) != &I2C_CONTROLLER_TYPE) {
        LOG_E(TAG, "Parent is not an I2C controller");
        return ERROR_RESOURCE;
    }

    auto address = GET_CONFIG(device)->address;

    // Verify chip ID
    uint8_t who_am_i = 0;
    if (i2c_controller_register8_get(i2c_controller, address, REG_WHO_AM_I, &who_am_i, I2C_TIMEOUT_TICKS) != ERROR_NONE
        || who_am_i != WHO_AM_I_VALUE) {
        LOG_E(TAG, "WHO_AM_I mismatch: got 0x%02X, expected 0x%02X", who_am_i, WHO_AM_I_VALUE);
        return ERROR_RESOURCE;
    }

    // Disable all sensors during configuration
    if (i2c_controller_register8_set(i2c_controller, address, REG_CTRL7, 0x00, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;

    // Serial interface: auto address increment, little-endian
    if (i2c_controller_register8_set(i2c_controller, address, REG_CTRL1, CTRL1_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;

    // Accel: ±8g, 1000Hz ODR
    if (i2c_controller_register8_set(i2c_controller, address, REG_CTRL2, CTRL2_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;

    // Gyro: ±2048°/s, 1000Hz ODR
    if (i2c_controller_register8_set(i2c_controller, address, REG_CTRL3, CTRL3_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;

    // Enable accel + gyro
    if (i2c_controller_register8_set(i2c_controller, address, REG_CTRL7, CTRL7_ENABLE, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;

    return ERROR_NONE;
}

static error_t stop(Device* device) {
    auto* i2c_controller = device_get_parent(device);