双串口问题

只看该作者 · 2012-10-18 22:38

本帖最后由 busdriver 于 2012-10-19 12:35 编辑

先说系统配置：
1.内部32M晶振，波特率115200bps
2.双串口，均是接收中断，查询发送。
现象：
1。开机串口1能发送数据
2。一旦接收到串口2的数据后，串口1就不能发送数据。TRMT始终是0，不能变1
可能表述不准确，现在看寄存器TRMT为1，没有问题，但是主程序就卡住了。但是中断正常。下面贴出读串口缓冲期程序。
主程序卡死在这条语句while (TRMT1 == 0);//pending until TSR is empty
接收中断还是正常执行。测量CLK输出也对，说明单片机还在正常跑。

2万 · 2012-10-19 09:25

贴出你的中断程序

只看该作者 · 2012-10-19 12:29

CLRWDT(); //clear WDT

if (TMR1IF) //if timer1 overflow interrupt
{
      //CLRWDT();
      //LCD_BL_CTRL = ~LCD_BL_CTRL;
      TMR1IF = 0;
      TMR1L = T1L;
      TMR1H = T1H;//Reload timer1 initial value, TMR1H:TMR1L = 0xFC18 = 64536
      lcd_timer++;

      if (key_step == 1) //in the step of delay
      {
         key_timer++;//key timet +1
      }
}

if (RC1IF) //if RS232 receive interrupt
{
      RC1IF = 0;//clear interupt flag
      rx1sign = 1;
      *inlast1 = RCREG1;
      inlast1++;

      if (inlast1 == (rx1buf + RX1BUFLEN) )
         inlast1 = rx1buf;
}

if (RC2IF) //if RS485 receive interrupt
{
      RC2IF = 0;//clear interupt flag
      *inlast2 = RCREG2;
      inlast2++;
      rx2sign = 1;

      if (inlast2 == (rx2buf + RX2BUFLEN) )
      {
         inlast2 = rx2buf;
      }
}

只看该作者 · 2012-10-19 12:30

主程序
      if (rx1sign) //if input buffer have incoming data from UART
         rs232_visit();

      if (rx2sign)
      {
         //newline();
         //puts ("get data from TDC...", 0);
         newline();
         puts ("**start data from TDC**", 0);
         tdc_visit();
         //newline();
         //puts ("**end data from TDC**", 0);
         //newline();
         //PutPrompt();
      }

只看该作者 · 2012-10-19 12:31

如果写成：
rx1sign，rx2sign均是unsigned char
      if (rx1sign == 1) //if input buffer have incoming data from UART
         rs232_visit();

      if (rx2sign == 1)
      {
         //newline();
         //puts ("get data from TDC...", 0);
         newline();
         puts ("**start data from TDC**", 0);
         tdc_visit();
         //newline();
         //puts ("**end data from TDC**", 0);
         //newline();
         //PutPrompt();
      }
就不会有问题。奇怪？

只看该作者 · 2012-10-19 12:35

/***********************************************************************
Name:void rs232_visit(unsignde int i)
Function:void
Input:none
Output:none
************************************************************************/
void rs232_visit()
{
unsigned char cmdbuf;
unsigned char rs232_cmd[10];
unsigned char *ptr1, *ptr2;
unsigned char temp = 0;
unsigned char str[8];
unsigned int number = 0;
//len = 1;
ptr2 = rs232_cmd;

while (temp != '\r')
{
      //if(getc(&cmdbuf,1,timeout,0) == 0x01)//get a character from
      getc (&cmdbuf, 1, 0);
      //return;//timeout, return
      //ptr1 = cmdbuf;
      *ptr2 = cmdbuf;
      temp = *ptr2;
      putc (*ptr2, 0);
      ptr2++;
}

*ptr2 = 0;

if ( (!number_flag) && (strcmp (rs232_cmd, "\r") == 0) )
{
      newline();
      puts (">", 0);//display prompt
}
else if ( (!number_flag) && (strcmp (rs232_cmd, "?\r") == 0) )
{
      newline();
      puts ("show menu...", 0);
      display_cmd();
}
else if ( (!number_flag) && (strcmp (rs232_cmd, "s\r") == 0) )
{
      newline();
      puts ("save eeprom...", 0);
      store_flag = 1;
      //display_cmd();
}
else if ( (!number_flag) && (strcmp (rs232_cmd, "start\r") == 0) )
{
      newline();
      puts ("start test,ready go...", 0);//
}
else if ( (!number_flag) && (strcmp (rs232_cmd, "d\r") == 0) ) //show voltage of 24V and 5V5
{
      //vdd_24v = 30000;
      num2asc (vdd_24v, str, 3);
      newline();
      puts ("The VDD_24V = ", 0);
      puts (str, 0);
      putc ('V', 0);
      num2asc (vdd_5v5, str, 3);
      newline();
      puts ("The VCC_5V5 = ", 0);
      puts (str, 0);
      putc ('V', 0);
      newline();
      puts (">", 0);//display prompt
}
else if ( (!number_flag) && (strcmp (rs232_cmd, "g\r") == 0) ) //get voltaga
{
      //ptr2 = str;
      newline();
      number_flag = 1;
      puts ("please input number(0-65535):", 0);
      //while(temp != '\r')
      //{
      // if(getc(&cmdbuf,1,timeout,0) == 0x01)//get a character from
      // return;//timeout, return
      //ptr1 = cmdbuf;
      //*ptr2 = cmdbuf;
      //temp = *ptr2;
      //putc(*ptr2,0);
      //ptr2++;
      //}
      //asc2num(str,&number);
      //num2asc(number,str,0);
      //puts(str,0);
      //newline();
      //puts(">",0);//display prompt
}
else if (number_flag) // && (strcmp(rs232_cmd,"0\r") >= 0) && (strcmp(rs232_cmd,"65535\r") <= 0))//get number
{
      number_flag = 0;

      //if(asc2num(rs232_cmd,&number) == 0x02)
      if (asc2num (rs232_cmd, &number) == 0x02)
      {
         num2asc (number, str, 0);
         //number = 0;
         newline();
         puts ("You have inputed:", 0);
         puts (str, 0);
         newline();
         puts (">", 0);//display prompt
      }
}
else
{
      newline();
      //if(number_flag)
      //{
      //number_flag = 0;
      //puts("Your input is not number.",0);
      //}
      //else
      //{
      puts ("The command is undefined!", 0);
      //}
      newline();
      puts (">", 0);//display prompt
}
}

只看该作者 · 2012-10-19 12:36

本帖最后由 busdriver 于 2012-10-19 16:04 编辑

/***********************************************************************
Name:unsigned char putc(void)
Function:get characters from the input buffer
Input:none
Output:the character
************************************************************************/
void getc (unsigned char *data, unsigned char len, unsigned char uart_type)
{
unsigned char temp = 0;
unsigned char cnt = 0;
//unsigned char data = 0x00,cnt = 0;

// if ( !( ((inlast >= getlast) && ((inlast -getlast) < len))
//    || ((inlast<getlast) && ((ILEN-(getlast-inlast))<len)) ) )
//{
switch (uart_type)
{
case 0://rs232
{
      while ( ( (inlast1 >= getlast1) && ( (inlast1 - getlast1) < len) )
            || ( (inlast1 < getlast1) && ( (RX1BUFLEN - (getlast1 - inlast1) ) < len) ) );

      //{
      //cnt += 10;
      //if(cnt>timeout)
      //break;
      //return(UART_TIMEOUT);
      //return(0x01);
      //}
      //RC1IE = 0;//disable receive interrupt

      for (cnt = 0; cnt < len; cnt++)
      {
         *data = *getlast1;
         data++;
         getlast1++;

         if (getlast1 == rx1buf + RX1BUFLEN)
         {
            getlast1 = rx1buf;
         }

         if (getlast1 == inlast1)
         {
            rx1sign = 0;//½ÓÊÕ»º³åÇø¿Õ
         }
      }

      //RC1IE = 1;//enable receive interrupt
      break;
}
case 1://rs485
{
      while ( ( (inlast2 >= getlast2) && ( (inlast2 - getlast2) < len) )
            || ( (inlast2 < getlast2) && ( (RX2BUFLEN - (getlast2 - inlast2) ) < len) ) );

      //{
      //cnt += 10;
      //if(cnt>timeout)
      //return(0x01);
      //break;
      //return(UART_TIMEOUT);
      //}
      //RC2IE = 0;//disable receive interrupt

      for (cnt = 0; cnt < len; cnt++)
      {
         temp = *getlast2;
         //data++;
         getlast2++;

         //temp2 = *getlast2;
         //getlast2++;
         if (temp == 0x7D)
         {
            *data = *getlast2;
            data++;
            getlast2++;
         }
         else
         {
            *data = temp;
            data++;
         }

         if (getlast2 == rx2buf + RX2BUFLEN)
         {
            getlast2 = rx2buf;
         }

         if (getlast2 == inlast2)
         {
            rx2sign = 0;//½ÓÊÕ»º³åÇø¿Õ
         }
      }

      //RC2IE = 1;//enable receive interrupt
      break;
}
/*
      case 2://ook
      {
         //unsigned char data = 0x00,cnt = 0;
         //INT1IE = 0;//disable receive interrupt
         //disable_int();
         //for (cnt=0; cnt<8; cnt++)
         while ( ( (ook_inlast >= ook_getlast) && ( (ook_inlast - ook_getlast) < len) )
                  || ( (ook_inlast < ook_getlast) && ( (ILEN - (ook_getlast - ook_inlast) ) < len) ) );

         //{
         for (cnt = 0; cnt < len; cnt++)
         {
            *data = *ook_getlast;
            data++;
            ook_getlast++;

            if (ook_getlast == ookbuf + ILEN)
            {
                  ook_getlast = ookbuf;
            }

            if (ook_getlast == ook_inlast)
            {
                  ooksign = 0;//½ÓÊÕ»º³åÇø¿Õ
            }
         }

         //}
         //INT1IE = 1;//enable receive interrupt
         //return(data);
      }
*/
default:
      break;
}

//return(UART_DONE);
//return(0x02);
//}
}

2万 · 2012-10-19 13:23

在PIC上，书写中断函数时，应当将中断溢出标志位和中断使能位结合起来判断。

例如：if (TMR0IE&&TMR0IF){}

只看该作者 · 2012-10-19 16:01

中断是一直使能的，好像没有区别啊

只看该作者 · 2012-10-21 16:54

开机启动时，接串口2的设备会发数据过来，而这时程序还没完成初始化，程序就会乱掉，估计是缓冲区指针被破坏了？
解决办法1：
1.修改串口程序，发送接收均设timeout机制，串口1正常了，但是不能响应串口2接收中断；示波器观察串口2发送接收波形正常的。
2.开机是disable串口2，由串口1命令enable之，串口2也正常了。

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