STM32 UART/USART接收问题（没有中断）

我试图以经由UART/USART上stm32L476发现板接收数据终端PC。我能够将数据传输到PC，但我无法接收任何数据。STM32 UART/USART接收问题（没有中断）

我的代码如下：

/* Includes ------------------------------------------------------------------*/ 
#include "main.h" 
#include "stm32l4xx_hal.h" 

/* USER CODE BEGIN Includes */ 

/* USER CODE END Includes */ 

/* Private variables ---------------------------------------------------------*/ 
UART_HandleTypeDef huart2; 

/* USER CODE BEGIN PV */ 
/* Private variables ---------------------------------------------------------*/ 

/* USER CODE END PV */ 

/* Private function prototypes -----------------------------------------------*/ 
void SystemClock_Config(void); 
static void MX_GPIO_Init(void); 
static void MX_USART2_UART_Init(void); 

/* USER CODE BEGIN PFP */ 
/* Private function prototypes -----------------------------------------------*/ 

/* USER CODE END PFP */ 
uint8_t cmd[] = {4,7,8,9}; 
uint8_t data[10]; 
uint8_t data1[10]; 
uint32_t err_code = 0; 
int count = 0; 
/* USER CODE BEGIN 0 */ 
int stat_re; 
int mydata = 1; 
/* USER CODE END 0 */ 

int main(void) 
{ 

    /* USER CODE BEGIN 1 */ 

    /* USER CODE END 1 */ 

    /* MCU Configuration----------------------------------------------------------*/ 

    /* 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_USART2_UART_Init(); 

    /* USER CODE BEGIN 2 */ 

    /* USER CODE END 2 */ 

    /* Infinite loop */ 
    /* USER CODE BEGIN WHILE */ 
    while (1) 
    { 
    /* USER CODE END WHILE */ 

     // HAL_UART_Transmit(&huart2,(uint8_t*) cmd, 4, 5); 
     // HAL_Delay(1000); 

     /* 
     while (!(USART_ISR_RXNE)); 
     mydata = (int)(USART_RDR_RDR & 0xFF);*/ 


    HAL_UART_Receive(&huart2, data, 10, 5000) 
     data1[10] = data[10]; 

    } 


} 

/** System Clock Configuration 
*/ 
void SystemClock_Config(void) 
{ 

    RCC_OscInitTypeDef RCC_OscInitStruct; 
    RCC_ClkInitTypeDef RCC_ClkInitStruct; 
    RCC_PeriphCLKInitTypeDef PeriphClkInit; 

    /**Initializes the CPU, AHB and APB busses clocks 
    */ 
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI; 
    RCC_OscInitStruct.MSIState = RCC_MSI_ON; 
    RCC_OscInitStruct.MSICalibrationValue = 0; 
    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6; 
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; 
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI; 
    RCC_OscInitStruct.PLL.PLLM = 1; 
    RCC_OscInitStruct.PLL.PLLN = 40; 
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7; 
    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2; 
    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2; 
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) 
    { 
    _Error_Handler(__FILE__, __LINE__); 
    } 

    /**Initializes the CPU, AHB and APB busses clocks 
    */ 
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK 
           |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2; 
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; 
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; 
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; 
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; 

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) 
    { 
    _Error_Handler(__FILE__, __LINE__); 
    } 

    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2; 
    PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_SYSCLK; 
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) 
    { 
    _Error_Handler(__FILE__, __LINE__); 
    } 

    HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1); 

    /**Configure the main internal regulator output voltage 
    */ 
    if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK) 
    { 
    _Error_Handler(__FILE__, __LINE__); 
    } 

    /**Configure the Systick interrupt time 
    */ 
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000); 

    /**Configure the Systick 
    */ 
    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK); 

    /* SysTick_IRQn interrupt configuration */ 
    HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0); 
} 

/* USART2 init function */ 
static void MX_USART2_UART_Init(void) 
{ 

    huart2.Instance = USART2; 
    huart2.Init.BaudRate = 115200; 
    huart2.Init.WordLength = UART_WORDLENGTH_8B; 
    huart2.Init.StopBits = UART_STOPBITS_1; 
    huart2.Init.Parity = UART_PARITY_NONE; 
    huart2.Init.Mode = UART_MODE_TX_RX; 
    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE; 
    huart2.Init.OverSampling = UART_OVERSAMPLING_16; 
    huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE; 
    huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT; 
    if (HAL_UART_Init(&huart2) != HAL_OK) 
    { 
    _Error_Handler(__FILE__, __LINE__); 
    } 

} 

/** Configure pins as 
     * Analog 
     * Input 
     * Output 
     * EVENT_OUT 
     * EXTI 
    PA8 ------> RCC_MCO 
*/ 
static void MX_GPIO_Init(void) 
{ 

    GPIO_InitTypeDef GPIO_InitStruct; 

    /* GPIO Ports Clock Enable */ 
    __HAL_RCC_GPIOA_CLK_ENABLE(); 
    __HAL_RCC_GPIOB_CLK_ENABLE(); 
    __HAL_RCC_GPIOE_CLK_ENABLE(); 

    /*Configure GPIO pin : PB2 */ 
    GPIO_InitStruct.Pin = GPIO_PIN_2; 
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; 
    GPIO_InitStruct.Pull = GPIO_NOPULL; 
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); 

    /*Configure GPIO pin : PE8 */ 
    GPIO_InitStruct.Pin = GPIO_PIN_8; 
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; 
    GPIO_InitStruct.Pull = GPIO_NOPULL; 
    HAL_GPIO_Init(GPIOE, &GPIO_InitStruct); 

    /*Configure GPIO pin : PA8 */ 
    GPIO_InitStruct.Pin = GPIO_PIN_8; 
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; 
    GPIO_InitStruct.Pull = GPIO_NOPULL; 
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; 
    GPIO_InitStruct.Alternate = GPIO_AF0_MCO; 
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); 

} 

/* USER CODE BEGIN 4 */ 

/* USER CODE END 4 */ 

/** 
    * @brief This function is executed in case of error occurrence. 
    * @param None 
    * @retval None 
    */ 
void _Error_Handler(char * file, int line) 
{ 
    /* USER CODE BEGIN Error_Handler_Debug */ 
    /* User can add his own implementation to report the HAL error return state */ 
    while(1) 
    { 
    } 
    /* USER CODE END Error_Handler_Debug */ 
} 

#ifdef USE_FULL_ASSERT 

/** 
    * @brief Reports the name of the source file and the source line number 
    * where the assert_param error has occurred. 
    * @param file: pointer to the source file name 
    * @param line: assert_param error line source number 
    * @retval None 
    */ 
void assert_failed(uint8_t* file, uint32_t line) 
{ 
    /* USER CODE BEGIN 6 */ 
    /* User can add his own implementation to report the file name and line number, 
    ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 
    /* USER CODE END 6 */ 

} 

#endif 

/** 
    * @} 
    */ 

/** 
    * @} 
*/ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

请让我知道如果你知道这个问题。我曾尝试去除连接到操纵杆的电阻器，该电阻器也连接到接收引脚USART2。

来源

2017-09-04 user8398475

你从最初的例子改变了什么？ –

如果你有一个像这样的数组'uint8_t data [10];'然后访问它的最后一个元素，如：data1 [10] = data [10];'是错误的。 10长阵列的最后一个元素位于索引9，因为第一个索引是0。 –

您似乎缺少GPIO配置。

对于这个特定的MCU，可以将USART2 RX复用功能分配给PA3或PD6。 TX是PA2或PD5。选择你需要的变体并初始化引脚 - 在这两种情况下它都是AF7。还要确保USART和GPIO的时钟已启用。

来源

2017-09-04 14:47:41

事实上，您的代码会一直阻塞，直到接收到10个字节或5秒超时。然后，您正在尝试读取数组中的1个字节，但您的读取超出了范围。要检查UART正常工作，你可以尝试一个非常简单的回声是这样的：

while(1) 
{ 
    uint8_t echo; 
    //Blocks indefinitely until 1 byte is received 
    HAL_UART_Receive(&huart2, &echo, 1, HAL_MAX_DELAY); 
    //Sends back the byte 
    HAL_UART_Transmit(&huart2, &echo, 1, HAL_MAX_DELAY); 
}

来源

2017-09-04 19:02:42

STM32 UART/USART接收问题（没有中断）

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