串口三232使用不了
将例程中的串口和端口稍作更改，程序如下，跳线棒也选择了com3的一边，为何不能实现例程中的发送数据再返回的功能（例程已经试过了，能行）。#include "usart.h"
/*******************************************************************************
* º¯ Êý Ãû : USART1_Init
* º¯Êý¹¦ÄÜ : USART1³õʼ»¯º¯Êý
* Êä Èë : bound:²¨ÌØÂÊ
* Êä ³ö : ÎÞ
*******************************************************************************/
void USART3_Init(u32 bound)
{
//GPIO¶Ë¿ÚÉèÖÃ
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
/*ÅäÖÃGPIOµÄģʽºÍIO¿Ú */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//TX //´®¿ÚÊä³öPA9
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö
GPIO_Init(GPIOB,&GPIO_InitStructure);/* ³õʼ»¯´®¿ÚÊäÈëIO */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;//RX //´®¿ÚÊäÈëPA10
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; //Ä£ÄâÊäÈë
GPIO_Init(GPIOB,&GPIO_InitStructure); /* ³õʼ»¯GPIO */
//USART1 ³õʼ»¯ÉèÖÃ
USART_InitStructure.USART_BaudRate = bound;//²¨ÌØÂÊÉèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8λÊý¾Ý¸ñʽ
USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öֹͣλ
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæżУÑéλ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½
USART_Init(USART3, &USART_InitStructure); //³õʼ»¯´®¿Ú1
USART_Cmd(USART3, ENABLE);//ʹÄÜ´®¿Ú1
USART_ClearFlag(USART3, USART_FLAG_TC);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//¿ªÆôÏà¹ØÖжÏ
//Usart1 NVIC ÅäÖÃ
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;//´®¿Ú1ÖжÏͨµÀ
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//ÇÀÕ¼ÓÅÏȼ¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //×ÓÓÅÏȼ¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQͨµÀʹÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯VIC¼Ä´æÆ÷¡¢
}
/*******************************************************************************
* º¯ Êý Ãû : USART1_IRQHandler
* º¯Êý¹¦ÄÜ : USART1ÖжϺ¯Êý
* Êä Èë : ÎÞ
* Êä ³ö : ÎÞ
*******************************************************************************/
void USART3_IRQHandler(void) //´®¿Ú1ÖжϷþÎñ³ÌÐò
{
u8 r;
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)//½ÓÊÕÖжÏ
{
r =USART_ReceiveData(USART3);//(USART1->DR); //¶ÁÈ¡½ÓÊÕµ½µÄÊý¾Ý
USART_SendData(USART3,r);
while(USART_GetFlagStatus(USART3,USART_FLAG_TC) != SET);
}
USART_ClearFlag(USART3,USART_FLAG_TC);
}
我也遇到这个问题，急求解决办法
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