STM32F103VBT6的串口2不能发送数据，请FAE帮忙看一下，谢谢！
这几天调试modbus，使用STM32F103VBT6的串口2，在配置完成后查询方式和中断方式都不能发送数据。不知道是配置还是哪里出错，请帮忙看下，谢谢！/**
* @brief串口初始化
* @paramucPORT 串口号
* ulBaudRate波特率
* ucDataBits数据位
* eParity 校验位
* @retval None
*/
BOOL
xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
(void)ucPORT; //不修改串口
(void)ucDataBits; //不修改数据位长度
(void)eParity; //不修改校验格式
//使能USART2，GPIOA
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//使能GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
// RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);//复位串口2
// RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);//停止复位
USART_InitStructure.USART_BaudRate = ulBaudRate; //只修改波特率
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;
//串口初始化
USART_Init(USART2, &USART_InitStructure);
USART_ITConfig(UART2, USART_IT_RXNE, ENABLE); /* 使能接收中断*/
USART_ITConfig(UART2, USART_IT_TC, ENABLE); /* 使能接收中断*/
//使能USART2
USART_Cmd(USART2, ENABLE);
USART_ClearFlag(UART2, USART_FLAG_TC);
//设定USART2 中断优先级
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
return TRUE;
}
/**
* @brief通过串口发送数据
* @paramNone
* @retval None
*/
BOOL
xMBPortSerialPutByte( CHAR ucByte )
{
//发送数据
USART_SendData(USART2, ucByte);
return TRUE;
}
/**
* @brief从串口获得数据
* @paramNone
* @retval None
*/
BOOL
xMBPortSerialGetByte( CHAR * pucByte )
{
//接收数据
*pucByte = USART_ReceiveData(USART2);
return TRUE;
}
/* Create an interrupt handler for the transmit buffer empty interrupt
* (or an equivalent) for your target processor. This function should then
* call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
* a new character can be sent. The protocol stack will then call
* xMBPortSerialPutByte( ) to send the character.
*/
static void prvvUARTTxReadyISR( void )
{
//mb.c eMBInit函数中
//pxMBFrameCBTransmitterEmpty = xMBRTUTransmitFSM
//发送状态机
pxMBFrameCBTransmitterEmpty();
}
/* Create an interrupt handler for the receive interrupt for your target
* processor. This function should then call pxMBFrameCBByteReceived( ). The
* protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
* character.
*/
static void prvvUARTRxISR( void )
{
//mb.c eMBInit函数中
//pxMBFrameCBByteReceived = xMBRTUReceiveFSM
//接收状态机
pxMBFrameCBByteReceived();
}
/**
* @briefUSART2中断服务函数
* @paramNone
* @retval None
*/
void USART2_IRQHandler(void)
{
//发生接收中断
if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET)
{
prvvUARTRxISR();
//清除中断标志位
USART_ClearITPendingBit(USART2, USART_IT_RXNE);
}
//发生完成中断
if(USART_GetITStatus(USART2, USART_IT_TC) == SET)
{
prvvUARTTxReadyISR();
//清除中断标志
USART_ClearITPendingBit(USART2, USART_IT_TC);
}
}
PA3也应该
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; wenyangzeng 发表于 2018-4-20 10:14
PA3也应该
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
RX也要设置GPIO_Mode_AF_PP？这样你就收不到数据了，GPIO_Mode_AF_PP是复用推挽输出的 队长shiwo 发表于 2018-8-31 16:01
RX也要设置GPIO_Mode_AF_PP？这样你就收不到数据了，GPIO_Mode_AF_PP是复用推挽输出的 ...
官方的例程参考一下看看能否解决：
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