关于485通信的问题求助

玩单片机的帅哥 · 发表于 2017-7-26 15:59:03

之前谢了一个串口程序，能够成功实现数据的发送和接收，后来想用max485来实现与电脑串口助手的通信，串口配置没有问题，但是一直不能实现485通信，下边是485引脚初始化和上位机发送函数的程序，麻烦原子大哥给解答下问题，谢谢

#define USART_RT_pinclock    RCC_AHBPeriph_GPIOA //′®¿úòy½Åê±Öó
#define USARTclock1       RCC_APB2Periph_USART1 //′®¿úê±Öó

#define USART_RT_pinport    GPIOA //½óêÕòy½Å¶Ë¿ú
#define USART1_T_pin       GPIO_Pin_9 //·￠Ëíòy½Å
#define USART1_R_pin       GPIO_Pin_10 //½óêÕòy½Å

#define USART_Enablepinlock    RCC_APB2Periph_GPIOE //485ê1Äüòy½Åê±Öó
#define USART_Enablepinport    GPIOE //485ê1Äüòy½Å¶Ë¿ú
#define RS485_Enablepin1    GPIO_Pin_14 //éÏÎ»»ú485ê1Äüòy½Å

#define RS485_Sendenable1    GPIO_SetBits(USART_Enablepinport,RS485_Enablepin1) //485·￠Ëíê1Äü
#define RS485_Receiveenable1    GPIO_ResetBits(USART_Enablepinport,RS485_Enablepin1) //485½óêÕê1Äü

void RS485Enable_GPIO_Configuration(void)       //485使能引脚
{
  GPIO_InitTypeDef  GPIO_InitStructure;

/* ê1ÄüGPIOEê±Öó */
RCC_AHBPeriphClockCmd(USART_Enablepinlock, ENABLE);

GPIO_InitStructure.GPIO_Pin = RS485_Enablepin1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(USART_Enablepinport, &GPIO_InitStructure); //òy½Å3õê¼»ˉ

}

void USART1_IRQHandler(void) //串口接收中断
{
  if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE )!=RESET)
  {
   RECEIVE_Buff[RECEIVE_Size]=USART_ReceiveData(USART1);
   RECEIVE_Size++;
   receive_flog=1;
   if(RECEIVE_Size>10)
   {
      RECEIVE_Size=0;//ÅD¶Ïêy¾YêÇ·ñòç3ö
   }
     RS485_Receiveenable1;
  }
}

void host_computer_send_PAC(void)             //上位机发送函数
{
unsigned char i;
if(receive_flog==1)
{
RS485_Sendenable1;
if((RECEIVE_Buff[0]==0x01)&&(RECEIVE_Buff[1]==0x02)&&(RECEIVE_Buff[2]==0x03)) //ÅD¶Ï½óêÕÃüáîêÇ·ñÕyè·
{
for(i=0;i<10;i++)
{
SEND_Buff[i]=Send_data_Group[i];
}
      SEND_Data_frame(SEND_Buff,10); //·￠Ëíêy¾Y
RS485_Receiveenable1;
      receive_flog=0;
RECEIVE_Size=0;
}
}
}
谢谢原子大哥，麻烦解决下，初学者