问个串口的问题

只看该作者 · 2017-9-12 14:40

本帖最后由 xiaox314 于 2017-9-12 15:15 编辑

M4的片子，初始化串口后，就一直中断，发现是TXE 和TC一直为1，后续测试只要开启UART1的时钟，这2位就一直是1，请问香水城主是什么原因会引起此现象？

只看该作者 · 2017-9-12 14:50

使用的是IAR的编译器，这个有关系吗？坛子里有其他人遇到此种情况的人有么？

1万 · 2017-9-12 15:01

上你串口初始化的代码

只看该作者 · 2017-9-12 15:10

void USARTConfig(void)
{
USART_InitTypeDef    USART_InitStructure;
GPIO_InitTypeDef    GPIO_InitStructure;
NVIC_InitTypeDef    NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //APB2  USART1
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10; //PA9--TX  PA10--RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel  = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_DeInit(USART1);

USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx ;//|USART_Mode_Tx
USART_Init(USART1, &USART_InitStructure);

// USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
// USART_ClearITPendingBit(USART1, USART_IT_RXNE);
// USART_ITConfig(USART1,USART_IT_TC,ENABLE);
//          USART_ClearITPendingBit(USART1, USART_IT_TC);

USART_Cmd(USART1,ENABLE);

}