[问答]

STM32串口调试进入死循环的原因？怎么解决？

795 STM32

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答案对人有帮助，有参考价值 0 最近在调试STM32串口，发现串口发送数据总是进入如下死循环 while(USART_GetFlagStatus(UART5, USART_FLAG_TXE) == RESET); 经检查发现串口时钟没有开，打开串口时钟后串口发送数据正常 RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE); //打开串口时钟附上串口配置完整代码 void uart_init(void) { /* 定义结构体变量 / GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; /开启时钟 / RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 \| RCC_APB2Periph_GPIOA \| RCC_APB2Periph_GPIOB, ENABLE); //Ê¹ÄÜUSART1£¬GPIOAÊ±ÖÓ RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART5, ENABLE); //Ê¹ÄÜUSART1£¬GPIOAÊ±ÖÓ / 初始化GPIO口/ //RS4851 USART1_TX GPIOA.9 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö GPIO_Init(GPIOA, &GPIO_InitStructure);//³õÊ¼»¯GPIOA.9 //USART1_RX GPIOA.10³õÊ¼»¯ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë GPIO_Init(GPIOA, &GPIO_InitStructure);//³õÊ¼»¯GPIOA.10 //RS4851 RE/DE GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;//PB0 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;// ÍÆÍìÊä³ö GPIO_Init(GPIOB, &GPIO_InitStructure); //UART5_TX GPIOC.12 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //PC12 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö GPIO_Init(GPIOC, &GPIO_InitStructure);//³õÊ¼»¯PC12 //UART5_RX GPIOD.2³õÊ¼»¯ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//PD2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë GPIO_Init(GPIOD, &GPIO_InitStructure);//³õÊ¼»¯GPIOD.2 / NVICÅäÖÃ / //Usart1 NVIC ÅäÖÃ NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3 ; //ÇÀÕ¼ÓÅÏÈ¼¶3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×ÓÓÅÏÈ¼¶3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀÊ¹ÄÜ NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷ //Uart5 NVIC ÅäÖÃ NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3 ; //ÇÀÕ¼ÓÅÏÈ¼¶3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //×ÓÓÅÏÈ¼¶2 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀÊ¹ÄÜ NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷ / USARTÅäÖÃ */ //USART1 ³õÊ¼»¯ÉèÖÃ USART_InitStructure.USART_BaudRate = 9600;//´®¿Ú²¨ÌØÂÊ USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8Î»Êý¾Ý¸ñÊ½ USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î» USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæÅ¼Ð£ÑéÎ» USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; //ÊÕ·¢Ä£Ê½ USART_Init(USART1, &USART_InitStructure); //³õÊ¼»¯´®¿Ú1 //UART5 ³õÊ¼»¯ÉèÖÃ USART_InitStructure.USART_BaudRate = 9600;//´®¿Ú²¨ÌØÂÊ USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8Î»Êý¾Ý¸ñÊ½ USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î» USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæÅ¼Ð£ÑéÎ» USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; //ÊÕ·¢Ä£Ê½ USART_Init(UART5, &USART_InitStructure); //³õÊ¼»¯´®¿Ú5 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //¿ªÆô´®¿Ú1½ÓÊÜÖÐ¶Ï USART_ITConfig(UART5, USART_IT_RXNE, ENABLE); //¿ªÆô´®¿Ú5½ÓÊÜÖÐ¶Ï USART_Cmd(USART1, ENABLE); //Ê¹ÄÜ´®¿Ú1 USART_Cmd(UART5, ENABLE); //Ê¹ÄÜ´®¿Ú5 } 以上为完成配置代码。

2021-12-15 10:41:42 评论举报卢家辉