请教大家关于STM32L151C8T6串口3只能收不能发问题.
在使用STM32L151C8T6的时候遇到的问题，串口3只能收不能发，已经做过串口配置和中断设置，同样的设置，串口1收发正常，求助一下，这个是什么原因？配置代码如下，请大家帮忙解答一下。void USART3_Config()
{
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //使能USART3
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); //使能GPIOB时钟
//connect PB.10 to usart3's tx
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_USART3);
//connect PB.11 to usart3's rx
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_USART3);
//USART3_TX PB.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //GPIO Output Mode
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//USART3_RX PB.11
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//浮空输入
// GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//USART3 初始化设置
USART_InitStructure.USART_BaudRate = 115200;//一般设置为115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART3, &USART_InitStructure); //初始化串口
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//开启中断
USART_Cmd(USART3, ENABLE); //使能串口
USART_ClearITPendingBit(USART3, USART_IT_TC);//清除串口TC位
}
//Usart3 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;//抢占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;//子优先级2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
UART1 与 UART2是不同的总线上；
注意有无跟其它管脚冲突的问题；
你的配置感觉没啥问题，外部线路也仔细检查下，焊接和连接方面； 还有，请使用Cube工具去配置，HAL库才是官方支持的！！！ RX引脚没有配置 不知道楼之调试成功没有，下面是我自己的代码，调试是成功的，仅供参考！
void MYUSART3_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); //PC10-TX PC11-RX
/* Enable UART clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
/* Connect PXx to USARTx_Tx */
GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_USART3);
/* Connect PXx to USARTx_Rx */
GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_USART3);
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Enable the USARTx Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = 57600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_2;
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 configuration */
USART_Init(USART3,&USART_InitStructure);
/* Enable USART */
USART_Cmd(USART3, ENABLE);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
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