PWM1 and Timer1 problems

[frierray]

All,

I was wondering if I could get some input from the group. The following is a small part of some PWM code. The PWM users PWM1 and Timer 2.

[PCM programmer]

[frierray]

PCM Programmer;

I forgot to include it with the post. Here it is:

#define TIMER1_PRESET (65536 - 5000) // Interrupt every 5000 counts

// t1 timer used for key switch management
#int_timer1
void timer1_isr(void)
{
set_timer1(TIMER1_PRESET);

{
miliseconds++;
}
}

I am using it to count milliseconds. In my code I need to know if a button is pressed and released or held down. If the count is > 500, it is assumed the button is held. There is a different action taken if it is pressed and released or held.

The PWM is controlled by a for loop. (If there is a better way to do this, please let me know) However, the for loop works great until I turn on the enable_interrupts(GLOBAL); After that the for loop only starts one pass and then stops. Control returns to my button code.

Any thoughts you have would be a big help.

Ray


void ramp_up()
{
// Set up PWM
set_pwm1_duty(0); // This sets the on time
setup_ccp1(CCP_PWM); // Configure CCP1 as a PWM
setup_timer_2(T2_DIV_BY_1, 127, 1); // Set Parms

ml=0; // reset ml counter

motor_speed=50; // motor speed start

for (ml=51;ml<=254;++ml) // loop for ramp up
{
motor_speed=((motor_speed*sp_factor)); // Set motor to x%
set_pwm1_duty(motor_speed); // This sets the on time
delay_ms(5); // loop timer 5 ms
motor_speed=motor_speed+1; // inc the loop 1
}
}