/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_I2C1_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
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
i2c address:（0x78 = 0x3c << 1）
*/
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
}
}
printf("\r\n");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_GPIO_TogglePin(GPIOE,GPIO_PIN_5);
HAL_Delay(500);
HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_5);
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