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本帖最后由 飞起来的面包渣 于 2020-5-29 18:45 编辑
stm32f407 uart4 复用PA0、PA1 无法正常接收 没有找到原因 求解答
代码如下:
void gps_uart_init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4,ENABLE); //使能USART4时钟
GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPS_USART_AF);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource1,GPS_USART_AF);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOA,&GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = bound; //波特率设置
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(UART4, &USART_InitStructure); //初始化串口
USART_Cmd(UART4, ENABLE); //使能串口
USART_ClearFlag(UART4, USART_FLAG_TC);
USART_ITConfig(UART4, USART_IT_RXNE, ENABLE); //开启相关中断
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; //串口4中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3; //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //子优先级
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、
}
void UART4_IRQHandler(void)
{
char r = 0;
if(USART_GetITStatus(UART4, USART_IT_RXNE) != RESET)
{
r = USART_ReceiveData(UART4);
USART_SendData(UART4,r);
USART_ClearFlag(UART4,USART_FLAG_RXNE);
USART_ClearITPendingBit(UART4,USART_IT_RXNE);
}
}
这是串口工具显示的(我没有主动发送任何数据):
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