关于stm32串口发送完成中断导致发送完成标志位为空从而进入死循环

ah669741 · 发表于 2021-6-30 22:04:12

各位大佬请教问题，我开启串口发送完成中断，在主函数中循环发送一个字符串到上位机，发现程序一直卡到while(!USART_GetFlagStatus(GPIO_Port, USART_FLAG_TC))这里，我把发送完成中断注释后，通过串口调试助手，可以循环收到数据，再次开启发送完成中断收不到数据，一直没找到原因

ah669741 · 发表于 2021-6-30 22:04:51

串口配置如下

void Print_UART1_init(u32 baud)
{
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef USART_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;

RCC_AHB1PeriphClockCmd(PRINT_GPIO_CLK, ENABLE);
RCC_APB2PeriphClockCmd(PRINT_UART_CLK, ENABLE);

GPIO_PinAFConfig(PRINT_GPIO_PORT, PRINT_UART_TX_REMAP, GPIO_AF_USART1);
GPIO_PinAFConfig(PRINT_GPIO_PORT, PRINT_UART_RX_REMAP, GPIO_AF_USART1);

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_Pin = PRINT_UART_TX_PIN|PRINT_UART_RX_PIN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(PRINT_GPIO_PORT, &GPIO_InitStruct);

USART_InitStruct.USART_BaudRate = baud;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Rx|USART_Mode_Tx;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_Init(PRINT_UART_PORT, &USART_InitStruct);

NVIC_InitStruct.NVIC_IRQChannel = PRINT_UART_IRQ;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 3;
NVIC_Init(&NVIC_InitStruct);

USART_ClearITPendingBit(PRINT_UART_PORT, USART_IT_TC);
USART_ITConfig(PRINT_UART_PORT, USART_IT_TC, ENABLE);

USART_Cmd(PRINT_UART_PORT, ENABLE);
}

u8 Print_UART1_RecvByte(USART_TypeDef* GPIO_Port)
{
while(USART_GetFlagStatus(GPIO_Port, USART_FLAG_RXNE) != SET);
return USART_ReceiveData(PRINT_UART_PORT);;
}

void Print_UART1_SendByte(USART_TypeDef* GPIO_Port, u8 data)
{
USART_SendData(GPIO_Port, (u16)data);
while(USART_GetFlagStatus(GPIO_Port, USART_FLAG_TXE) != SET);
}

void Print_UART1_SendNByte(USART_TypeDef* GPIO_Port, u8* data, u32 len)
{
int i ;
for(i = 0; i < len; ++i){
Print_UART1_SendByte(GPIO_Port, data[i]);
}
while(!USART_GetFlagStatus(GPIO_Port, USART_FLAG_TC));
}

int fputc(int ch, FILE *f)
{
USART_SendData(PRINT_UART_PORT, (uint8_t) ch);
while (USART_GetFlagStatus(PRINT_UART_PORT, USART_FLAG_TXE) == RESET);
return (ch);
}

int fgetc(FILE *f)
{
while (USART_GetFlagStatus(PRINT_UART_PORT, USART_FLAG_RXNE) == RESET);
return (int)USART_ReceiveData(PRINT_UART_PORT);
}

ah669741 · 发表于 2021-6-30 22:05:33

中断服务函数

void USART1_IRQHandler(void)
{
if(USART_GetITStatus(PRINT_UART_PORT, USART_IT_TC) == SET)
{
USART_ClearITPendingBit(PRINT_UART_PORT, USART_IT_TC);
enter_TC_IT_count++;
}
}

ah669741 · 发表于 2021-6-30 22:06:12

主函数

int main(void)
{
while(1){
//printf("enter_TC_IT_count:%d\r\n", enter_TC_IT_count);
delay_ms(1000);
Print_UART1_SendNByte(PRINT_UART_PORT, (u8*)buf, strlen(buf));
}
}