stm32F429在485通信时不能通过串口工具发送数据

huislee · 发表于 2020-3-10 15:39:49

#include "sys.h"
//#include "usart.h"
#include "rs485.h"
#include "delay.h"
//#include "pcf8574.h"
#include "string.h"

//////////////////////////////////////////////////////////////////////////////////
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//ALIENTEK STM32¿a·￠°å
//RS485Çy¶ˉ ′úÂë
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//′′½¨èÕÆú:2015/12/28
//°æ±¾￡oV1.0
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) 1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾ 2014-2024
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////

void RS485_RTS_Init()
{
RCC->AHB1ENR|=1<<1;    //ê1ÄüPORTB¿úê±Öó
GPIO_Set(GPIOB,PIN5,GPIO_MODE_OUT,GPIO_OTYPE_PP,GPIO_SPEED_50M,GPIO_PUPD_PU);//PB5,¸′óÃ1|Äü,éÏà-êä3ö
}

#if EN_USART1_RX    //èç1ûê1ÄüáË½óêÕ
//½óêÕ»o′æÇø
u8 RS485_RX_BUF[USART_REC_LEN];    //½óêÕ»o3å,×î¶àSART_REC_LEN¸ö×Ö½ú.
//½óêÕμ½μÄêy¾Y3¤¶è
u8 RS485_RX_CNT=0;
//bit15, ½óêÕíê3é±ê×¼
//bit14, êÕμ½0x0d
//bit13~0, óDD§êy¾YêyÄ¿
//u16 USART_RX_STA=0;
void USART1_IRQHandler(void)
{
u8 res;

if(USART1->SR&(1<<5))//½óêÕμ½êy¾Y
{
res=USART1->DR;
if(res!=0x0d||res!=0x0a)
   {
RS485_RX_BUF[RS485_RX_CNT]=res; //¼ÇÂ¼½óêÕμ½μÄÖμ
RS485_RX_CNT++; //½óêÕêy¾YÔö¼ó1
   }
}
/*
RS485_RX_CNT=0;
if(USART1->SR&(1<<5))//½óêÕμ½êy¾Y
{
res=USART1->DR;
if((USART_RX_STA&0x8000)==0)
{
if(USART_RX_STA&0x4000)//0x0d
{
if(res!=0x0a)USART_RX_STA=0;
else USART_RX_STA|=0x8000;
}else
{
if(res==0x0d)USART_RX_STA|=0x4000;
else
{
   RS485_RX_BUF[RS485_RX_CNT]=res; //¼ÇÂ¼½óêÕμ½μÄÖμ
      RS485_RX_CNT++; //½óêÕêy¾YÔö¼ó1
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;
}
}
}
} */

/*

if((USART_RX_STA&0x8000)==0)
{
if(USART_RX_STA&0x4000)
{
if(res!=0x0a)USART_RX_STA=0;
else USART_RX_STA|=0x8000;
}
else
{
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;
}
}
}

*/
}
#endif
//3õê¼»ˉIO ′®¿ú1
//pclk1

CLK1ê±ÖóÆμÂê(Mhz),APB1ò»°ãÎa48Mhz
//bound:2¨ìØÂê
void RS485_Init(u32 pclk1,u32 bound)
{
float temp;
u16 mantissa;
u16 fraction;
temp=(float)(pclk1*1000000)/(bound*16);//μÃμ½USARTDIV@OVER8=0
mantissa=temp;    //μÃμ½Õûêy2¿·Ö
fraction=(temp-mantissa)*16; //μÃμ½D¡êy2¿·Ö@OVER8=0
mantissa<<=4;
mantissa+=fraction;

RS485_RTS_Init();
RCC->AHB1ENR|=1<<1;    //ê1ÄüPORTB¿úê±Öó

GPIO_Set(GPIOB,PIN6|PIN7,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_50M,GPIO_PUPD_PU);//PB6,PB7¸′óÃ1|Äü,éÏà-êä3ö
// GPIO_Set(GPIOB,PIN7,GPIO_MODE_AF,GPIO_OTYPE_PP,GPIO_SPEED_50M,GPIO_PUPD_PU);//PB7,¸′óÃ1|Äü,éÏà-êä3ö
GPIO_AF_Set(GPIOB,6,7); //PB6,AF7
GPIO_AF_Set(GPIOB,7,7);//PB7,AF7
RCC->APB2ENR|=1<<4;    //ê1Äü′®¿ú1ê±Öó
RCC->APB2ENR|=1<<4;    //¸′Î»′®¿ú1ê±Öó
RCC->APB2RSTR&=~(1<<4);
//2¨ìØÂêéèÖÃ
USART1->BRR=mantissa; //2¨ìØÂêéèÖÃ
USART2->CR1|=0X200C; //
USART1->CR1&=~(1<<15); //éèÖÃOVER8=0
USART1->CR1|=1<<3;    //′®¿ú·￠Ëíê1Äü
#if EN_USART1_RX       //èç1ûê1ÄüáË½óêÕ
//ê1Äü½óêÕÖD¶Ï
USART1->CR1|=1<<2;    //′®¿ú½óêÕê1Äü
USART1->CR1|=1<<5; //½óêÕ»o3åÇø·Ç¿ÕÖD¶Ïê1Äü
MY_NVIC_Init(3,3,USART1_IRQn,2);//×é2￡¬×îμíóÅÏè¼¶
#endif
USART1->CR1|=1<<13;    //′®¿úê1Äü

RS485_TX_Set(0); //Ä¬èÏéèÖÃÎa½óêÕÄ￡ê½
}

//RS485·￠Ëílen¸ö×Ö½ú.
//buf:·￠ËíÇøê×μØÖ·
//len:·￠ËíμÄ×Ö½úêy(ÎaáËoí±¾′úÂëμÄ½óêÕÆ￥Åä,Õaàï½¨òé2»òa3¬1y64¸ö×Ö½ú)
void RS485_Send_Data(u8 *buf,u8 len)
{
u8 t;
RS485_TX_Set(1); //éèÖÃÎa·￠ËíÄ￡ê½
    for(t=0;t<len;t++) //Ñ-»··￠Ëíêy¾Y
{
while((USART1->SR&0X40)==0);//μè′y·￠Ëí½áêø
USART1->DR=buf[t];
}
while((USART1->SR&0X40)==0);//μè′y·￠Ëí½áêø
RS485_RX_CNT=0;
RS485_TX_Set(0); //éèÖÃÎa½óêÕÄ￡ê½
}
//RS4852éÑˉ½óêÕμ½μÄêy¾Y
//buf:½óêÕ»o′æê×μØÖ·
//len:¶áμ½μÄêy¾Y3¤¶è
void RS485_Receive_Data(u8 *buf,u8 *len)
{
u8 rxlen=RS485_RX_CNT;
u8 i=0;
*len=0; //Ä¬èÏÎa0
delay_ms(10); //μè′y10ms,á¬Dø3¬1y10msÃ»óD½óêÕμ½ò»¸öêy¾Y,ÔòèÏÎa½óêÕ½áêø
if(rxlen==RS485_RX_CNT&&rxlen)//½óêÕμ½áËêy¾Y,Çò½óêÕíê3éáË
{
for(i=0;i<rxlen;i++)
{
buf=RS485_RX_BUF;
}
*len=RS485_RX_CNT; //¼ÇÂ¼±¾′Îêy¾Y3¤¶è
RS485_RX_CNT=0; //Çåáã
}
}
//RS485Ä￡ê½¿ØÖÆ.
//en:0,½óêÕ;1,·￠Ëí.
void RS485_TX_Set(u8 en)
{
PBout(5)=en;
}

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stm32F429在485通信时不能通过串口工具发送数据

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