hal_i2c_scan.c

void I2C_Scan(void) {
	printf("Scanning I2C bus:\r\n");
	HAL_StatusTypeDef result;
	uint8_t i;
	for (i = 1; i < 128; i++) {
		/*
		 * the HAL wants a left aligned i2c address
		 * &hi2c1 is the handle
		 * (uint16_t)(i<<1) is the i2c address left aligned
		 * retries 2
		 * timeout 2
		 */
		result = HAL_I2C_IsDeviceReady(&hi2c1, (uint16_t) (i << 1), 2, 2);
		if (result != HAL_OK) // HAL_ERROR or HAL_BUSY or HAL_TIMEOUT
				{
			printf("."); // No ACK received at that address
		}
		if (result == HAL_OK) {
			printf("0x%X", i); // Received an ACK at that address
			sprintf(test, "0x%X", i);
			HAL_UART_Transmit(&huart2, (uint8_t*) test, strlen(test), 100);
		}
	}
	printf("\r\n");
}