STM32F103zet6 USART1 不能同时收发？

sfraim · 发表于 2018-9-28 09:36:57

本帖最后由 sfraim 于 2018-9-28 10:21 编辑

STM32F103zet6 USART1  不能同时收发？我要实现：主程序里循环发送数据，同时在中断里接收数据，但是发现无法工作，
只有停止持续循环发送时才能在中断里接收数据，这是咋回事？
附上代码
//初始化
void USART1_Int(u16 baud)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
USART_DeInit(USART1);
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);
//USART1_TX PA.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;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//USART1_RX PA.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = baud;
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_Cmd(USART1, ENABLE);
}

//主程序循环持续调用这个函数发送数据，发送是成功的，上位机可以收到
int SendData(USART_TypeDef * USARTx,uint8_t ch)
{
USART_SendData(USARTx, (uint8_t) ch);
while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET) {}
return ch;
}

//问题来了，中断里接收数据 --------- 如果主程序持续发送中，这个接收中断好像就没有触发(上位机发100个字节，也许就1个字节能触发中断)，除非主程序停止循环发送，这个中断才会触发，我才能接收到数据
void USART1_IRQHandler(void)
{
u8 ch = 0,i = 0,chck = 0;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
ch = (USART_ReceiveData(USART1));//这是接收字符
  }
}