芯片的示例程序里面沒有有關UART的配置，所以根據手冊自己寫了UART4配置（重映射PB0和PB1），實測下來沒有數據輸出，也沒有進接收中斷，能否看看是哪里配置有問題，具體配置如下：
void UART4_Init (uint32_t band)
{
? ? USART_InitTypeDef USART_InitStructure;
? ? GPIO_InitTypeDef GPIO_InitStructure;
? ? NVIC_InitTypeDef? NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE);
? ? RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);
? ? GPIO_PinRemapConfig( GPIO_FullRemap_USART4, ENABLE );
? ??
? ? GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;?
? ? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
? ? GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
? ? GPIO_Init(GPIOB, &GPIO_InitStructure);
? ??
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;?
GPIO_Init(GPIOB, &GPIO_InitStructure);
? ? USART_InitStructure.USART_BaudRate = band;
? ? 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(UART4, &USART_InitStructure);?
? ? USART_ClearFlag(UART4, USART_FLAG_RXNE);?
? ? USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
? ? USART_Cmd(UART4, ENABLE);?
? ? //NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);? //采用組別2?
? ? NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;
? ? NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
? ? NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
? ? NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
? ? NVIC_Init( &NVIC_InitStructure );
}
void UART4_IRQHandler(void)
{
? if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET) //若接收數據寄存器滿
? {
printf("%d\r\n", USART_ReceiveData(UART4));
? }
?// printf("INT\r\n");
? USART_ClearITPendingBit(UART4,USART_IT_ORE);
}
