• State Not Answered
  • Locked Locked
  • Replies 6 replies
  • Subscribers 20 subscribers
  • Views 1332 views
  • Users 0 members are here
Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Problem in using the timer 0 for delay in serial interrupt

arun a

The code is below, it run perfectly when i run it step by step during debugging. But when i
run it continuously it stuck somewhere after executing the ISR.

Is there any mistake i done?

please give suggestion if i done any.

Thank you.

#include <REGX51.H>

sbit motof = P2^0;
sbit motob = P2^1;


void timer2()
        {
        TH0 = 0xff;
        TL0 = 0xfd;

        TR0 = 1;

        while(TF0 == 0);
        TR0 = 0;
        TF0 = 0;
        }



void msdelay(unsigned char ms)
        {
        int i;
        for(i=0;i<=ms;i++)
        timer2();
        }

void ser() interrupt 4
        {

        char j;
        while(RI == 0);
        j = SBUF;
        RI = 0;

        if(j=='f')
                {
                motof = 0;

                motob = 0;
                msdelay(10);
                motob = 1;
                msdelay(10);
                }
        if(j=='r')
                {
                motob = 0;

                motof = 1;
                msdelay(10);
                motof = 0;
                msdelay(10);
                }

        }


void main()
        {

        SCON = 0x50;
        TMOD = 0x21;
        TH1 = 0xFD;
        TR1 = 1;
        IE = 0x90;
        while(1)
                {
                motob = 0;
                motof = 0;
                msdelay(10);

                motof = 1;
                msdelay(10);
                }
        }

0