stm32f407 想用usart2的俩串口但是测试串口助手一直测试不到数据为啥啊

ljk218 · 发表于 2021-2-1 15:58:04

usart.c

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

#if SYSTEM_SUPPORT_OS
#include "includes.h"
#endif
//////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////

#if 1
#pragma import(__use_no_semihosting)

struct __FILE
{
int handle;
};

FILE __stdout;

void _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 USART2_RX_BUF[USART2_REC_LEN];

u16 USART2_RX_STA=0;

void uart2_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_9 | GPIO_Pin_10;
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;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

#endif

}

void USART2_IRQHandler(void)
{
u8 Res;
#if SYSTEM_SUPPORT_OS
OSIntEnter();
#endif
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
Res =USART_ReceiveData(USART2);//(USART1->DR);

if((USART2_RX_STA&0x8000)==0)
{
if(USART2_RX_STA&0x4000)
{
if(Res!=0x0a)USART2_RX_STA=0;
else USART2_RX_STA|=0x8000;
}
else //»1Ã»êÕμ½0X0D
{
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;
}
}
}
  }
#if SYSTEM_SUPPORT_OS
OSIntExit();
#endif
}
#endif
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

usart.h

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

//////////////////////////////////////////////////////////////////////////////////
#define USART2_REC_LEN    200
#define EN_USART2_RX 1

extern u8  USART2_RX_BUF[USART2_REC_LEN];
extern u16 USART2_RX_STA;
void uart2_init(u32 bound);
#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);
delay_init(168);
uart2_init(115200);
LED_Init();
while(1)
{
if(USART2_RX_STA&0x8000)
{
len=USART2_RX_STA&0x3fff;
printf("\r\nÄú·￠ËíμÄÏûÏ￠Îa:\r\n");
for(t=0;t<len;t++)
{
USART_SendData(USART2, USART2_RX_BUF[t]);
while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);
}
printf("\r\n\r\n");
USART2_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;
delay_ms(10);
}
}
}