STM32F407 USART1改为USART2后，串口无打印信息

Anson0304 · 发表于 2019-9-23 15:33:49

大神们帮忙给看看，谢谢啦

usart.h

#ifndef __USART_H
#define __USART_H
#include "stdio.h"
#include "stm32f4xx_conf.h"
#include "sys.h"

#define USART_REC_LEN    200
#define EN_USART2_RX 1

extern u8  USART_RX_BUF[USART_REC_LEN];
extern u16 USART_RX_STA;
void uart_init(u32 bound);
#endif

usart.c

#include "sys.h"
#include "usart.h"

#if 1
#pragma import(__use_no_semihosting)

struct __FILE
{
int handle;
};

FILE __stdout;

_sys_exit(int x)
{
x = x;
}
int fputc(int ch, FILE *f)
{
while((USART2->SR&0X40)==0);
USART2->DR = (u8) ch;
return ch;
}

#endif
#if EN_USART2_RX
u8 USART_RX_BUF[USART_REC_LEN];
u16 USART_RX_STA=0;

void uart_init(u32 bound){

  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = bound;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
      USART_Init(USART2, &USART_InitStructure);

      USART_Cmd(USART2, ENABLE);

#if EN_USART2_RX
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //×óóÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
      NVIC_Init(&NVIC_InitStructure);
#endif

}

void USART2_IRQHandler(void)             //′®¿ú2ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{
Res =USART_ReceiveData(USART2);//(USART2->DR); //¶áè¡½óêÕμ½μÄêy¾Y

if((USART_RX_STA&0x8000)==0)//½óêÕÎ′íê3é
{
if(USART_RX_STA&0x4000)//½óêÕμ½áË0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//½óêÕ′íÎó,ÖØDÂ¿aê¼
else USART_RX_STA|=0x8000; //½óêÕíê3éáË
}
else //»1Ã»êÕμ½0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//½óêÕêy¾Y′íÎó,ÖØDÂ¿aê¼½óêÕ
}
}
}
  }
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();
#endif
}
#endif

main.c

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "beep.h"
#include "key.h"

int main(void)
{

u8 t;
u8 len;
u16 times=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//éèÖÃÏμí3ÖD¶ÏóÅÏè¼¶·Ö×é2
delay_init(168); //Ñóê±3õê¼»ˉ
uart_init(115200); //′®¿ú3õê¼»ˉ2¨ìØÂêÎa115200
LED_Init();       //3õê¼»ˉóëLEDá¬½óμÄó2¼t½ó¿ú
while(1)
{
if(USART_RX_STA&0x8000)
{
len=USART_RX_STA&0x3fff;//μÃμ½′Ë′Î½óêÕμ½μÄêy¾Y3¤¶è
printf("\r\nÄú·￠ËíμÄÏûÏ￠Îa:\r\n");
for(t=0;t<len;t++)
{
USART_SendData(USART2, USART_RX_BUF[t]);       //Ïò′®¿ú2·￠Ëíêy¾Y
while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);//μè′y·￠Ëí½áêø
}
printf("\r\n\r\n");//2åèë»»DD
USART_RX_STA=0;
}else
{
times++;
if(times%5000==0)
{
printf("\r\nALIENTEK ì½Ë÷ÕßSTM32F407¿a·￠°å ′®¿úêμÑé\r\n");
printf("ÕyμãÔ-×ó@ALIENTEK\r\n\r\n\r\n");
}
if(times%200==0)printf("Çëêäèëêy¾Y,òÔ»Ø3μ¼ü½áêø\r\n");
if(times%30==0)LED0=!LED0;//éáË¸LED,ìáê¾Ïμí3ÕyÔúÔËDD.
delay_ms(10);
}
}
}