Stm32F407ZGT6串口一库函数的样例参数改成usart2的参数之后，电脑串口调试助手显示没找到串口

TLv · 发表于 2020-7-24 11:20:22

Stm32F407ZGT6开发板的串口一库函数实验样例，将里面的参数改成usart2的参数之后，下载到板子上，再用数据线连接到电脑，电脑串口调试助手显示没找到串口
附代码如下：
———————main.c------------------
#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "beep.h"
#include "key.h"
#include "stm32f4xx.h"

int main(void)
{

u8 t;
u8 len;
u16 times=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃÏµÍ³ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é2
delay_init(168);       //ÑÓÊ±³õÊ¼»¯
uart_init(115200); //´®¿Ú³õÊ¼»¯²¨ÌØÂÊÎª115200
LED_Init();                //³õÊ¼»¯ÓëLEDÁ¬½ÓµÄÓ²¼þ½Ó¿Ú
while(1)
{
      if(USART_RX_STA&0x8000)
      {
         len=USART_RX_STA&0x3fff;//µÃµ½´Ë´Î½ÓÊÕµ½µÄÊý¾Ý³¤¶È
         printf("\r\nÄú·¢ËÍµÄÏûÏ¢Îª:\r\n");
         for(t=0;t<len;t++)
         {
            USART_SendData(USART2, USART_RX_BUF[t]);       //Ïò´®¿Ú1·¢ËÍÊý¾Ý
            while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);//µÈ´ý·¢ËÍ½áÊø
         }
         printf("\r\n\r\n");//²åÈë»»ÐÐ
         USART_RX_STA=0;
      }else
      {
         times++;
         if(times%5000==0)
         {
            printf("\r\nALIENTEK ´®¿ÚÊµÑé\r\n");
            printf("ÏÄÌì³ÔÎ÷¹Ï\r\n\r\n\r\n");
         }
         if(times%200==0)printf("ÇëÊäÈëÊý¾Ý,ÒÔ»Ø³µ¼ü½áÊø\r\n");
         if(times%30==0) LED0=!LED0;//ÉÁË¸LED,ÌáÊ¾ÏµÍ³ÕýÔÚÔËÐÐ.
         delay_ms(10);
      }
}
}

----------------------usart.c----------------------
#include "sys.h"
#include "usart.h"
//////////////////////////////////////////////////////////////////////////////////
//Èç¹ûÊ¹ÓÃucos,Ôò°üÀ¨ÏÂÃæµÄÍ·ÎÄ¼þ¼´¿É.
#if SYSTEM_SUPPORT_OS
#include "includes.h"                   //ucos Ê¹ÓÃ
#endif
//////////////////////////////////////////////////////////////////
//¼ÓÈëÒÔÏÂ´úÂë,Ö§³Öprintfº¯Êý,¶ø²»ÐèÒªÑ¡Ôñuse MicroLIB
#if 1
#pragma import(__use_no_semihosting)
//±ê×¼¿âÐèÒªµÄÖ§³Öº¯Êý
struct __FILE
{
int handle;
};

FILE __stdout;
//¶¨Òå_sys_exit()ÒÔ±ÜÃâÊ¹ÓÃ°ëÖ÷»úÄ£Ê½
_sys_exit(int x)
{
x = x;
}
//ÖØ¶¨Òåfputcº¯Êý
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 //Èç¹ûÊ¹ÄÜÁË½ÓÊÕ
//´®¿Ú1ÖÐ¶Ï·þÎñ³ÌÐò
//×¢Òâ,¶ÁÈ¡USARTx->SRÄÜ±ÜÃâÄªÃûÆäÃîµÄ´íÎó
u8 USART_RX_BUF[USART_REC_LEN];    //½ÓÊÕ»º³å,×î´óUSART_REC_LEN¸ö×Ö½Ú.
//½ÓÊÕ×´Ì¬
//bit15£¬ ½ÓÊÕÍê³É±êÖ¾
//bit14£¬ ½ÓÊÕµ½0x0d
//bit13~0£¬ ½ÓÊÕµ½µÄÓÐÐ§×Ö½ÚÊýÄ¿
u16 USART_RX_STA=0;    //½ÓÊÕ×´Ì¬±ê¼Ç

//³õÊ¼»¯IO ´®¿Ú1
//bound:²¨ÌØÂÊ
void uart_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);//Ê¹ÄÜUSART1Ê±ÖÓ

//´®¿Ú1¶ÔÓ¦Òý½Å¸´ÓÃÓ³Éä
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); //GPIOA9¸´ÓÃÎªUSART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2); //GPIOA10¸´ÓÃÎªUSART1

//USART1¶Ë¿ÚÅäÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; //GPIOA9ÓëGPIOA10
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»&#175

A9£&#172

A10

//USART1 ³õÊ¼»¯ÉèÖÃ
USART_InitStructure.USART_BaudRate = bound;//²¨ÌØÂÊÉèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8Î»Êý¾Ý¸ñÊ½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæÅ¼Ð£ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½
  USART_Init(USART2, &USART_InitStructure); //³õÊ¼»¯´®¿Ú1

  USART_Cmd(USART2, ENABLE);  //Ê¹ÄÜ´®¿Ú1

//USART_ClearFlag(USART1, USART_FLAG_TC);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿ªÆôÏà¹ØÖÐ¶Ï

//Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;//´®¿Ú1ÖÐ¶ÏÍ¨µÀ
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//ÇÀÕ¼ÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;       //×ÓÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;          //IRQÍ¨µÀÊ¹ÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷¡¢

}

void USART2_IRQHandler(void)                   //´®¿Ú1ÖÐ¶Ï·þÎñ³ÌÐò
{
u8 Res;
#if SYSTEM_SUPPORT_OS       //Èç¹ûSYSTEM_SUPPORT_OSÎªÕæ£¬ÔòÐèÒªÖ§³ÖOS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)  //½ÓÊÕÖÐ¶Ï(½ÓÊÕµ½µÄÊý¾Ý±ØÐëÊÇ0x0d 0x0a½áÎ²)
{
      Res =USART_ReceiveData(USART2);//(USART1->DR); //¶ÁÈ¡½ÓÊÕµ½µÄÊý¾Ý

      if((USART_RX_STA&0x8000)==0)//½ÓÊÕÎ´Íê³É
      {
         if(USART_RX_STA&0x4000)//½ÓÊÕµ½ÁË0x0d
         {
            if(Res!=0x0a)USART_RX_STA=0;//½ÓÊÕ´íÎó,ÖØÐÂ¿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;//½ÓÊÕÊý¾Ý´íÎó,ÖØÐÂ¿ªÊ¼½ÓÊÕ
            }
         }
      }
  }
#if SYSTEM_SUPPORT_OS    //Èç¹ûSYSTEM_SUPPORT_OSÎªÕæ£¬ÔòÐèÒªÖ§³ÖOS.
OSIntExit();
#endif
}
#endif

还望各路高手指教！感激不尽