Use case #1

In this use case the PWM module is configured with overflow interrupt.

Setup steps

Example code

Add to application C-file:

* struct pwm_config pwm_cfg;
*
* void my_callback(void)
* {
*      do_something();
* }

* void pwm_init(void)
* {
*     pmic_init();
*     sysclk_init();
*
*     cpu_irq_enable();
*
*     pwm_init(&pwm_cfg, PWM_TCE0, PWM_CH_A, 75);
*     pwm_overflow_int_callback(&pwm_cfg, my_callback);
* }

Workflow

1. Define config struct for PWM module:

   struct pwm_config pwm_cfg; 

2. Define a callback function in the application which does whatever task you want it to do:

   void my_callback(void)
   {
        do_something();
   }

3. Initialize interrupt controller module:

   pmic_init();

4. Initialize sysclock module:

   sysclk_init();

5. Enable global interrupts:

   cpu_irq_enable();

6. Initialize config struct and set up PWM with frequency of 75 Hz:

   pwm_init(&pwm_cfg, PWM_TCE0, PWM_CH_A, 75); 

   Note

   Since the timer/counter PWM_TCE0 and channel PWM_CH_A is used, the PWM will be output on port E, pin 0. See pwm_tc_t and pwm_channel_t for more information on what port/pin is used for different timer/counters.

   Attention

   This step must not be skipped or the initial content of the structs will be unpredictable, possibly causing misconfiguration.

7. Set callback function on PWM TC channel overflow:

   pwm_overflow_int_callback(&pwm_cfg, my_callback); 

Usage steps

Example code

Add to, e.g., main loop in application C-file:

pwm_start(&pwm_cfg, 50); 

Workflow

1. Start PWM with 50% duty cycle:

   pwm_start(&pwm_cfg, 50);