User manual

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mikroC PRO for PIC32
MikroElektronika
403
Library Example
The example changes PWM duty ratio on channels 1 and 2 continuously. If LEDs are connected to channels 1 and 2,
a gradual change of emitted light will be noticeable.
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unsigned int current_duty, old_duty, current_duty1, old_duty1;
unsigned int pwm_period1, pwm_period2;
void InitMain() {
CHECON = 0x32;
AD1PCFG = 0xFFFF; // Congure AN pins as digital I/O
TRISB = 0xFFFF; // congure PORTB pins as input
PORTD = 0; // set PORTD to 0
TRISD = 0; // designate PORTD pins as output
}
void main() {
InitMain();
current_duty = 100; // initial value for current_duty
current_duty1 = 100; // initial value for current_duty1
pwm_period1 = PWM_Init(5000 , 1, 1, 2);
pwm_period2 = PWM_Init(10000, 2, 1, 3);
PWM_Start(1);
PWM_Start(2);
PWM_Set_Duty(current_duty, 1); // Set current duty for PWM1
PWM_Set_Duty(current_duty1, 2); // Set current duty for PWM2
while (1) { // endless loop
if (RB0_bit) { // button on RB0 pressed
Delay_ms(1);
current_duty = current_duty + 5; // increment current_duty
if (current_duty > pwm_period1) { // if we increase current_duty greater then
possible pwm_period1 value
current_duty = 0; // reset current_duty value to zero
}
PWM_Set_Duty(current_duty, 1); // set newly acquired duty ratio
}
if (RB1_bit) { // button on RB1 pressed
Delay_ms(1);
current_duty = current_duty - 5; // decrement current_duty
if (current_duty > pwm_period1) { // if we decrease current_duty greater then
possible pwm_period1 value (overow)
current_duty = pwm_period1; // set current_duty to max possible value
}
PWM_Set_Duty(current_duty, 1); // set newly acquired duty ratio
}