Hello wachaudhary
Here is an example of PWM programming :
void setup () {
// PWM Set-up on pin PC7 (Arduino Pin 39): see Datasheet chap. 38.5.1
// Select Instance=PWM; Signal=PWMH2 (channel 2); I/O Line=PC7 (P7, Arduino pine 39, see pinout diagram) ; Peripheral=B
PMC->PMC_PCER1 |= PMC_PCER1_PID36; // PWM on
REG_PIOC_ABSR |= PIO_ABSR_P7; // Set PWM pin perhipheral type B
REG_PIOC_PDR |= PIO_PDR_P7; // Set PWM pin to an output
REG_PWM_ENA = PWM_ENA_CHID2; // Enable the PWM channel 2 (see datasheet page 973)
REG_PWM_CLK = PWM_CLK_PREA(0) | PWM_CLK_DIVA(42); // Set the PWM clock rate to 2MHz (84MHz/42). Adjust DIVA for the resolution you are looking for
REG_PWM_CMR2 = PWM_CMR_CALG |PWM_CMR_CPRE_CLKA; // The period is left aligned, clock source as CLKA on channel 2
REG_PWM_CPRD2 = 1000000; // Channel 2 : Set the PWM frequency 2MHz/(2 * CPRD) = F ; 1< CPRD < 2exp24 -1 ; here CPRD = 10 exp 6
REG_PWM_CDTY2 = 200000; // Channel 2: Set the PWM duty cycle to x%= (CDTY/ CPRD) * 100 % , CDTY = 2 * 10 exp 5
// Alternatively, you can use this format : PWM->PWM_CH_NUM[2].PWM_CPRD = 1000000 ;
// In this example, Frequency is 1 HZ with a DT of 20% so you can see it with an LED attached to pin 39 with a resistor
}
void loop() {
}