Ac voltage calculation using pic16f877a

[anjalimidhuna]

Hi all,
i have searched a lot in Google as well as in our forum. but i didn't get a correct solution. :-(

i am trying to read ac voltage with ADC (channel 2) and display it to LCD. it shows value 486 (can be scale to 0) when ac supply is off. but when the supply is on it hold the LCD display in the previous position. :?:

void interrupt isr(void)
{
 if(TMR1IF==1)
 {
	TMR1IF=0;
	TMR1H=0XFC;
	TMR1L=0X17;
	cnt++;
	tmr++;
	if(cnt==5)
	{
		value=AdcRead(channel[2]);
		cnt=0;
	}
	if(tmr==1000)
	{
		tmr=0;
		lcdflag=1;
	}
 }
}
void main()
{
    T1CON=0b00000001;			
    TMR1H=0XFC;					
    TMR1L=0X17;					
    INTCON=0b11000000;					
    PIE1=0b00000101;			
	 Lcd_Init();
	 adc_init();
 while(1)
 {
	if(lcdflag==1)
	{
		LCD(Lcd_clear,ModCmd);
		Delay_ms(100);
		LCD(FstLin_FstColumn,ModCmd);
		Disp_STRING(int_to_string(value,buf));
		lcdflag=0;
	}
 }
}

i tried bit toggling in interrupt it works. but it have no change when it is in the if loop.
i am using hitech c with pic16f877a. i got the correct output when i programmed in micro c .

am i misd any cmds ??
is there any other setting ??

 

[milan.rajik]

https://www.edaboard.com/threads/304920/#post1305244