【NUCLEO-F411RE】连接ST-LINK的串口是USART2,占用PA2(TX)和PA3(RX)两个IO口;
所以我们在原子哥代码的基础上进行修改就可以了;
这里特别感谢原子哥的教程,让ST单片机的学习变得形象易懂!
具体代码如下:
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//usart2.h文件
#ifndef __USART2_H
#define __USART2_H
#include "stdio.h"
#include "stm32f4xx_conf.h"
#include "sys.h"
#define USART2_REC_LEN 200 //¶¨òå×î′ó½óêÕ×Ö½úêy 200
#define EN_USART2_RX 1 //ê1Äü£¨1£©/½ûÖ1£¨0£©′®¿ú1½óêÕ
extern u8 USART2_RX_BUF[USART2_REC_LEN]; //½óêÕ»o3å,×î′óUSART1_REC_LEN¸ö×Ö½ú.Ä©×Ö½úÎa»»DD·û
extern u16 USART2_RX_STA; //½óêÕ×′쬱ê¼Ç
//èç1ûÏë′®¿úÖD¶Ï½óêÕ£¬Çë2»òa×¢êíòÔÏÂo궨òå
void usart2_init(u32 bound);
#endif
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//usart2.c文件
#include "sys.h"
#include "usart2.h"
////////////////////////////////////////////////////////////////
//¼óèëòÔÏÂ′úÂë,Ö§3Öprintfoˉêy,¶ø2»DèòaÑ¡Ôñuse MicroLIB
#if 1
#pragma import(__use_no_semihosting)
//±ê×¼¿aDèòaμÄÖ§3Öoˉêy
struct __FILE
{
int handle;
};
FILE __stdout;
//¶¨òå_sys_exit()òÔ±üÃaê1óðëÖ÷»úÄ£ê½
_sys_exit(int x)
{
x = x;
}
//Öض¨òåfputcoˉêy
int fputc(int ch, FILE *f)
{
while((USART2->SR&0X40)==0);//Ñ-»··¢Ëí,Ö±μ½·¢Ëííê±Ï
USART2->DR = (u8) ch;
return ch;
}
#endif
//////////////////////////////////////////////////////////////////
#if EN_USART2_RX //èç1ûê1Äüá˽óêÕ
//′®¿ú2ÖD¶Ï·tÎñ3ìDò
//×¢òa,¶áè¡USARTx->SRÄü±üÃaÄaÃûÆäÃîμÄ′íÎó
u8 USART2_RX_BUF[USART2_REC_LEN]; //½óêÕ»o3å,×î′óUSART1_REC_LEN¸ö×Ö½ú.
//½óêÕ×′ì¬
//bit15£¬ ½óêÕíê3é±êÖ¾
//bit14£¬ ½óêÕμ½0x0d
//bit13~0£¬ ½óêÕμ½μÄóDD§×Ö½úêyÄ¿
u16 USART2_RX_STA=0; //½óêÕ×′쬱ê¼Ç
//3õê¼»ˉIO ′®¿ú2
//bound:2¨ìØÂê
void usart2_init(u32 bound){
//GPIO¶Ë¿úéèÖÃ
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //ê1ÄüGPIOAê±Öó
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//ê1ÄüUSART2ê±Öó
//′®¿ú1¶Ôó|òy½Å¸′óÃó3éä
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //GPIOA2¸′óÃÎaUSART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //GPIOA3¸′óÃÎaUSART1
//USART1¶Ë¿úÅäÖÃ
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; //GPIOA2óëGPIOA3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸′óÃ1|Äü
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //Ëù¶è50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //íÆíì¸′óÃêä3ö
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //éÏà-
GPIO_Init(GPIOA,&GPIO_InitStructure); //3õê¼»ˉPA2£¬
A3
//USART1 3õê¼»ˉéèÖÃ
USART_InitStructure.USART_BaudRate = bound;//2¨ìØÂêéèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8λêy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí£Ö1λ
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæżD£Ñéλ
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·¢Ä£ê½
USART_Init(USART2, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
USART_Cmd(USART2, ENABLE); //ê1Äü′®¿ú1
//USART_ClearFlag(USART2, USART_FLAG_TC);
#if EN_USART2_RX
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿aÆôÏà1ØÖD¶Ï
//Usart1 NVIC ÅäÖÃ
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;//′®¿ú1ÖD¶Ïí¨μà
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//ÇàÕ¼óÅÏ輶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //×óóÅÏ輶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷¡¢
#endif
}
void USART2_IRQHandler(void) //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(USART2);//(USART1->DR); //¶á衽óêÕμ½μÄêy¾Y
if((USART2_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART2_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART2_RX_STA=0;//½óêÕ′íÎó,ÖØD¿aê¼
else USART2_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1ûêÕμ½0X0D
{
if(Res==0x0d)USART2_RX_STA|=0x4000;
else
{
USART2_RX_BUF[USART2_RX_STA&0X3FFF]=Res ;
USART2_RX_STA++;
if(USART2_RX_STA>(USART2_REC_LEN-1))USART2_RX_STA=0;//½óêÕêy¾Y′íÎó,ÖØD¿aê¼½óêÕ
}
}
}
}
}
#endif
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//main函数里面的设置
delay_init(100); //3õê¼»ˉÑóê±oˉêy
LED_Init(); //3õê¼»ˉLED¶Ë¿ú
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
usart2_init(115200);
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