我花了一整天和今晚试图找出我的接收功能不起作用的原因。当我最初开始这个项目时它很好（这是几天前）。从那以后我已经做了更多的工作，现在它不起作用了。
我什至现在在 CubeMX 上创建了一个新项目，只设置了 jtag 和 uart5，但仍然没有接收功能。我可以确认该板在我从事的许多旧项目中都能正常工作。
我相信在构建过程中发生了一些事情，但我无法弄清楚。
我正在使用 STM32F207 芯片。
下面是我为测试 UART 功能而编写的非常基本的程序。我可以很好地传输，只是没有接收功能起作用。
我什至在我的主循环中添加了简单的“HAL_UART_Receive()”，超时时间很长，它完全跳过了整个函数！
我也强制激活了 UART 中断，但这并没有做任何事情。
我今天早些时候用之前的提交恢复了这个项目，并且构建运行得很好。然后它在编译后再次停止工作。我试图再次恢复它，第二次它没有解决问题。
当向 MCU 发送数据时，触发 RXNE 标志并且数据寄存器被更改，但是不会更改为远程发送的任何内容。
我的想法不多了！
主要.c：
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f2xx_hal.h"
#include "usart.h"
#include "gpio.h"
#include "string.h"
/* Private variables ---------------------------------------------------------*/
extern uint8_t pc_uart_receive_flag;
extern char pc_buff[8];
char sys_ready[] = "UART Transmit test\r\n";
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/**
* @brief The application entry point.
*
* @retval None
*/
int main(void)
{
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_UART5_Init();
/*
* FORCING THESE ACTIVE AND STILL NOTHING
*/
/* UART5 interrupt Init */
HAL_NVIC_SetPriority(UART5_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(UART5_IRQn);
HAL_UART_Transmit_IT(&huart5, (uint8_t*)sys_ready, strlen(sys_ready));
/* Infinite loop */
while (1)
{
/*
* NOT EVEN THIS WORKS!
*/
HAL_UART_Receive(&huart5, (uint8_t*)pc_buff, strlen(pc_buff), 100000);
//PC receive flag
if(pc_uart_receive_flag==1){
/*
* BEGIN DEBUG
*/
HAL_UART_Transmit_IT(&huart5, (uint8_t*)pc_buff, strlen(pc_buff)); // Return value that is saved
/*
* END DEBUG
*/
pc_uart_receive_flag=0; // Reset flag
}
}
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = 16;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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_HSI;
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_0) != 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);
}
/**
* @brief This function is executed in case of error occurrence.
* @param file: The file name as string.
* @param line: The line in file as a number.
* @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)
{
}
}
#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,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
usart.c:
/* Includes ------------------------------------------------------------------*/
#include "usart.h"
#include "gpio.h"
UART_HandleTypeDef huart5;
/* UART5 init function */
void MX_UART5_Init(void)
{
huart5.Instance = UART5;
huart5.Init.BaudRate = 115200;
huart5.Init.WordLength = UART_WORDLENGTH_8B;
huart5.Init.StopBits = UART_STOPBITS_1;
huart5.Init.Parity = UART_PARITY_NONE;
huart5.Init.Mode = UART_MODE_TX_RX;
huart5.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart5.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart5) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(uartHandle->Instance==UART5)
{
/* UART5 clock enable */
__HAL_RCC_UART5_CLK_ENABLE();
/**UART5 GPIO Configuration
PC12 ------> UART5_TX
PD2 ------> UART5_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_UART5;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_UART5;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/* UART5 interrupt Init */
HAL_NVIC_SetPriority(UART5_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(UART5_IRQn);
}
}
void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
{
if(uartHandle->Instance==UART5)
{
/* Peripheral clock disable */
__HAL_RCC_UART5_CLK_DISABLE();
/**UART5 GPIO Configuration
PC12 ------> UART5_TX
PD2 ------> UART5_RX
*/
HAL_GPIO_DeInit(GPIOC, GPIO_PIN_12);
HAL_GPIO_DeInit(GPIOD, GPIO_PIN_2);
/* UART5 interrupt Deinit */
HAL_NVIC_DisableIRQ(UART5_IRQn);
}
}
stm32f2xx_it.c（中断）：
/* Includes ------------------------------------------------------------------*/
#include "stm32f2xx_hal.h"
#include "stm32f2xx.h"
#include "stm32f2xx_it.h"
#include "string.h"
/* External variables --------------------------------------------------------*/
extern UART_HandleTypeDef huart5;
uint16_t pc_uart_receive_flag=0;
char pc_buff[8];
/******************************************************************************/
/* Cortex-M3 Processor Interruption and Exception Handlers */
/******************************************************************************/
/**
* @brief This function handles Non maskable interrupt.
*/
void NMI_Handler(void)
{
}
/**
* @brief This function handles Hard fault interrupt.
*/
void HardFault_Handler(void)
{
while (1)
{
}
}
/**
* @brief This function handles Memory management fault.
*/
void MemManage_Handler(void)
{
while (1)
{
}
}
/**
* @brief This function handles Pre-fetch fault, memory access fault.
*/
void BusFault_Handler(void)
{
while (1)
{
}
}
/**
* @brief This function handles Undefined instruction or illegal state.
*/
void UsageFault_Handler(void)
{
while (1)
{
}
}
/**
* @brief This function handles System service call via SWI instruction.
*/
void SVC_Handler(void)
{
}
/**
* @brief This function handles Debug monitor.
*/
void DebugMon_Handler(void)
{
}
/**
* @brief This function handles Pendable request for system service.
*/
void PendSV_Handler(void)
{
}
/**
* @brief This function handles System tick timer.
*/
void SysTick_Handler(void)
{
HAL_IncTick();
HAL_SYSTICK_IRQHandler();
}
/******************************************************************************/
/* STM32F2xx Peripheral Interrupt Handlers */
/* Add here the Interrupt Handlers for the used peripherals. */
/* For the available peripheral interrupt handler names, */
/* please refer to the startup file (startup_stm32f2xx.s). */
/******************************************************************************/
/**
* @brief This function handles UART5 global interrupt.
*/
void UART5_IRQHandler(void)
{
HAL_UART_IRQHandler(&huart5);
HAL_UART_Receive_IT(&huart5, (uint8_t*) pc_buff, strlen(pc_buff));
}
/**
* @brief This function handles the callback for the UART channels.
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){
// Callback triggered by UART5
if (huart->Instance == UART5){
pc_uart_receive_flag=1;
}
}