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- 8
- 注册时间
- 2020-5-12
- 在线时间
- 3 小时
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2金钱
串口1和MVB模块通信,发送正常,串口1接收出现问题,用示波器打了串口1输入的信号,可以肯定数据不是0啊,不知道为啥接收的数据全是0,大佬提点一下!
void USART1_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
/* 第1步:打开GPIO和USART部件的时钟 */
/* Enable USART3 GPIO clocks */
RCC_AHB1PeriphClockCmd(UART1_GPIO_RCC, ENABLE);
/* Enable USART3 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_UART1, ENABLE);
/* Connect alternate function */
GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PIN_SOURCE, GPIO_AF_USART1);
GPIO_PinAFConfig(UART1_GPIO, UART1_RX_PIN_SOURCE, GPIO_AF_USART1);
/* 第2步:将USART Tx的GPIO配置为推挽复用模式 */
GPIO_InitStructure.GPIO_Pin = UART1_GPIO_TX ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 第3步:将USART Rx的GPIO配置为浮空输入模式
由于CPU复位后,GPIO缺省都是浮空输入模式,因此下面这个步骤不是必须的
但是,我还是建议加上便于阅读,并且防止其它地方修改了这个口线的设置参数
*/
GPIO_InitStructure.GPIO_Pin = UART1_GPIO_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 第4步:配置USART参数
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 115200;// 115200
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;//设置校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_Init(USART1, &USART_InitStructure);
/* 第5步:使能 USART, 配置完毕 */
USART_ClockInit(USART1, &USART_ClockInitStructure);
USART_Cmd(USART1, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //USART3全局中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//设置USART1在NVIC_IRQChannel中的抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //设置USART1在NVIC_IRQChannel中的响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //USART1中断使能
NVIC_Init(&NVIC_InitStructure);
/* CPU的小缺陷:串口配置好,如果直接Send,则第1个字节发送不出去
如下语句解决第1个字节无法正确发送出去的问题 */
USART_ClearFlag(USART1, USART_FLAG_TC); /* 清发送外城标志,Transmission Complete flag */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
}
/*******************************************************************************
* Function Name : USARTx_IRQHandler
* Description : This function handles USART1 global interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART1_IRQHandler(void)
{
extern u8 UART1_RxBuffer[72];
static u16 Rx1Count=0;
if (USART_GetFlagStatus(USART1, USART_FLAG_ORE) != RESET)
{
(uint16_t)(USART1->DR & (uint16_t)0x01FF);
}
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
UART1_RxBuffer[Rx1Count++] = USART_ReceiveData(USART1); //
if(Rx1Count > RxLen)
{
Rx1Count = 0x00;
Uart1RxFlag=1;
GPIO_ResetBits(GPIOF, GPIO_Pin_11);
}
USART_ClearFlag(USART1, USART_FLAG_RXNE);
}
}
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