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stm32f407的串口3配置好了之后再用LCD显示传送数据的时候，显示屏没显示，是串口配置错误了吗？///////////////// usart3.h /////////////////#ifndef __USART3_H#define __USART3_H#include "sys.h"#include "stdio.h" #include "stm32f4xx_conf.h"#define USART3_MAX_RECV_LEN 200//最大接收缓存字节数#define USART3_MAX_SEND_LEN 200 //最大发送缓存字节数#define EN_USART3_RX 1 //0不接收;1接收.extern u8 USART3_RX_BUF[USART3_MAX_RECV_LEN]; //接收缓冲最大USART3_MAX_RECV_LEN字节extern u8 USART3_TX_BUF[USART3_MAX_SEND_LEN]; //发送缓冲最大USART3_MAX_SEND_LEN字节extern u16 USART3_RX_STA; //接收数据状态void uart3_init(u32 bound); //串口3初始化//void TIM7_Int_Init(u16 arru16 psc);//void u2_printf(char* fmt ...);#endif///////////////// usart3.c /////////////////#include "usart3.h"#include "sys.h"#if EN_USART3_RX //如果使能了接收//串口3中断服务程序//注意读取USARTx->SR能避免莫名其妙的错误 u8 USART3_TX_buf[USART3_MAX_SEND_LEN];u8 USART3_RX_BUF[USART3_MAX_RECV_LEN]; //接收缓冲最大USART3_REC_LEN个字节.u16 USART3_RX_STA=0; //接收状态标记 //初始化IO 串口3//bound:波特率void uart3_init(u32 bound){ //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOBENABLE); //使能GPIOB时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3ENABLE);//使能USART3时钟 //串口3对应引脚复用映射 GPIO_PinAFConfig(GPIOBGPIO_PinSource10GPIO_AF_USART3); //GPIOB10复用为USART3 GPIO_PinAFConfig(GPIOBGPIO_PinSource11GPIO_AF_USART3); //GPIOB11复用为USART3 //USART3端口配置 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; //GPIOB10与GPIOB11 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(GPIOB&GPIO_InitStructure); //初始化PB10，PB11 //USART3 初始化设置 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(USART3 &USART_InitStructure); //初始化串口3 USART_Cmd(USART3 ENABLE); //使能串口3 USART_ClearFlag(USART3 USART_FLAG_TC); #if EN_USART3_RX USART_ITConfig(USART3 USART_IT_RXNE ENABLE);//开启相关中断 //Usart1 NVIC 配置 NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;//串口3中断通道 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//抢占优先级3 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、#endif }void USART3_IRQHandler(void) //串口3中断服务程序{ u8 Res;#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS. OSIntEnter(); #endif if(USART_GetITStatus(USART3 USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾) { Res =USART_ReceiveData(USART3);//(USART3->DR); //读取接收到的数据 if((USART3_RX_STA&0x8000)==0)//接收未完成 { if(USART3_RX_STA&0x4000)//接收到了0x0d { if(Res!=0x0a)USART3_RX_STA=0; //接收错误重新开始 else USART3_RX_STA|=0x8000; //接收完成了 } else //还没收到0X0D { if(Res==0x0d)USART3_RX_STA|=0x4000; else { USART3_RX_BUF[USART3_RX_STA&0X3FFF]=Res ; USART3_RX_STA++; if(USART3_RX_STA>(USART3_MAX_RECV_LEN-1))USART3_RX_STA=0;//接收数据错误重新开始接收 } } } } #if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS. OSIntExit(); #endif} #endif

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stm32f407的串口3配置问题

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