[51] 8051 Timer Interrupt Programming.

Titus Manoj Kumar said:

Dear All,

Am working on 8051 Timer Interrupt Programming.

Specs:

Timer 0 Mode 1.
Need to blink an Led for 30 seconds.
Xtal Freq: 11.0592Mhz.

I've pasted the code below. Could you please identify the errors in it. If so could you give me the complete code for it. It'l be a great help. Thanks.

code :

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Code C - [expand]
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#include<reg51.h>
sbit led = P2^0;        //LED connected to D0 of port 1
 
void timer(void) interrupt 1        //interrupt no. 1 for Timer 0
{
int x;
for (x=0; x<600 ; x++)
{
led=~led;       //toggle LED on interrupt
TR0 = 0;
}
}
main()
{
TMOD = 0x01;        // mode1 of Timer0
TH0 = 0x4C;     // initial values loaded to timer
TL0 = 0x00;
IE = 0x82;      // enable interrupt
TR0 = 1;        //start timer
while(1);       // do nothing  
}

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Click to expand...

while(1);

while(1)
{
//do some work here
//may be blinking leds on some other ports .
}

udayan92 said:

It looks like you did not call the timer function in the main function.

Click to expand...