mym786
Newbie level 3
![Newbie level 3](/styles/images/ranks/alevel3.gif)
Hey,
I am using PIC16F877A and MicroC compiler.
I am facing a problem with timer0. The code works fine in the simulation (ISIS proteus). However, when i programmed the microcontroller the timer0 doesn't work.
The code is for Traffic Light Control System.
I am using PIC16F877A and MicroC compiler.
I am facing a problem with timer0. The code works fine in the simulation (ISIS proteus). However, when i programmed the microcontroller the timer0 doesn't work.
The code is for Traffic Light Control System.
Code:
int time=1;
int i=0;
sbit Lane1 at PORTB.B7;
sbit Lane2 at PORTB.B6;
sbit Lane3 at PORTB.B5;
sbit Lane4 at PORTB.B4;
sbit clock at PORTB.B3;
sbit Timer_Led at PORTB.B2;
sbit L1_Cong at PORTD.B5;
sbit L2_Cong at PORTD.B4;
sbit L3_Cong at PORTD.B3;
sbit L4_Cong at PORTD.B2;
void Rise();
void main() {
TRISB = 0x00;
PORTB = 0x00;
TRISD.B7 = 0;
TRISD.B6 = 0;
TRISD.B5 = 1;
TRISD.B4 = 1;
TRISD.B3 = 1;
TRISD.B2 = 1;
PORTD.B7 = 0;
PORTD.B6 = 0;
// Timer0 Registers:
// Prescaler=1:256; TMR0 Preset=60; Freq=39.85969Hz; Period=0.025088 s
OPTION_REG.T0CS = 0;// bit 5 TMR0 Clock Source Select bit:0=Internal Clock (CLKO) / 1=Transition on T0CKI pin
OPTION_REG.T0SE = 0;// bit 4 TMR0 Source Edge Select bit: 0=low/high / 1=high/low
OPTION_REG.PSA = 0;// bit 3 Prescaler Assignment bit: 0=Prescaler is assigned to the Timer0
OPTION_REG.PS2 = 1;// bits 2-0 PS2:PS0: Prescaler Rate Select bits
OPTION_REG.PS1 = 1;
OPTION_REG.PS0 = 1;
TMR0 = 60;
INTCON.GIE = 1; // preset for timer register
INTCON.TMR0IE = 1;
INTCON.TMR0IF = 0;
Timer_Led = 0;
clock =0;
Lane1 = 1;
Lane3 = 1;
Lane2 = 0;
Lane4 = 0;
Rise();
while(1)
{
if(time == 400)
{
Lane1=~Lane1;
Lane2=~Lane2;
Lane3=~Lane3;
Lane4=~Lane4;
Rise();
}
}
}
void interrupt()
{
if(INTCON.TMR0IF)
{
INTCON.TMR0IF = 0;
Timer_Led = !Timer_Led;
if(++time == 401) time = 1;
TMR0 = 60;
}
}
void Rise()
{
for(i=0; i<5; ++i)
{
clock = 1;
delay_ms(50);
clock = 0;
delay_ms(50);
}
}