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| 串口双板通信,一个板子发送字符b,另一个板子接收字符并发送,有时候能接收到,有时候接收不到 void int_uart(void)
 {
 GPIO_InitTypeDef GPIO_InitStruct;
 
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
 GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
 GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
 GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_3;
 GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 
 GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
 }
 
 void cfg_uart(void)
 {
 USART_InitTypeDef USART_InitStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
 
 USART_InitStructure.USART_BaudRate = 115200;
 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_IRQChannelPriority = 1;
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 NVIC_Init(&NVIC_InitStructure);
 
 USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
 USART_Cmd(USART1, ENABLE);
 }
 
 void USART1_IRQHandler(void)
 {
 if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
 {
 start_check = USART_ReceiveData(USART1);
 
 if(start_check == 'b')
 {
 iic_send_switch(22);
 uart_send_data(start_check );
 }
 
 }
 }
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