两块STM32F103主控板,用各自的USART1 通信收发数据,(都是通过外部中断触发)一块能收能发,一块只能发送数据不能接收数据,硬件经过排查没有问题,想问问前辈们我的代码是否有误。(其他配置经过验证是没问题的,现在排查之后觉得最有可能的就是接收函数问题)以下是串口配置和中断服务函数代码:
我发送的数组为 u8 Work_CH2[10] ={0x31,0x31,0x0d,0x0a};
外部中断服务函数为:
void EXTI4_IRQHandler(void) {
int i ;
if(EXTI_GetITStatus(EXTI_Line4)!=RESET)
{
EXTI_ClearITPendingBit(EXTI_Line4);
TIM_SetCompare1(TIM3,6000);
for(i=0;i<4;i++)
{
USART_SendData(USART1, Work_CH2);
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
}
}
}
void usart1_init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
USART_DeInit(USART1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = bound;
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);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}
void USART1_IRQHandler(void)
{
u8 Res;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
Res =USART_ReceiveData(USART1);
if((USART_RX_STA&0x8000)==0)
{
if(USART_RX_STA&0x4000)
{
if(Res!=0x0a)USART_RX_STA=0;
else
{
USART_RX_STA|=0x8000;
}
}
else
{
if(Res==0x0d) USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;
}
}
}
}
}
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