我把串口引脚改了收不到数据

z2500053109 · 发表于 2014-12-12 10:54:11

以下是代码求大神帮解决着急啊

[mw_shl_code=c,true]void uart_init(u32 bound){ //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOB时钟 USART_DeInit(USART1); //复位串口1 //USART1_TX PA.9 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PB.8 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PB8 //USART1_RX PA.10 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PB9 //Usart1 NVIC 配置 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 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 //USART 初始化设置 USART_InitStructure.USART_BaudRate = bound;//一般设置为9600; 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(USART1, &USART_InitStructure); //初始化串口 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启中断 USART_Cmd(USART1, ENABLE); //使能串口 } [/mw_shl_code]

[mw_shl_code=c,true] int main(void) { u8 i,flag=0; delay_init(); //延时函数初始化 LED_Init(); //初始化I/O // key_init(); NVIC_Configuration(); uart_init(2400); Init_1621(); HT1621_all_on(); delay_ms(1000); HT1621_all_off(); delay_ms(1000); // HT1621_all_on(); Display_PM2P5_Flag_On(); Display_CH2O_Flag_On(); Display_Wendu_Flag_On(); Display_Shidu_Flag_On(); Display_PM2P5_Value(250); Display_CH2O_Value(110); Display_Wendu_Value(20); Display_Shidu_Value(30); while(1) { while (USART_GetITStatus(USART1, USART_IT_RXNE) == RESET); i=USART_ReceiveData(USART1); PM=10; // return USART_ReceiveData(USART1); Display_PM2P5_Value(PM); delay_ms(1000); } } [/mw_shl_code]