Usercode Time and PWM

Functions

• void user_int_timer_1ms (void)
  • timer interrupt every 1 millisecond
  • This function call is already defined in user_code.c.
• void user_defined_int_timer (void)
  • timer interrupt on a user defined interval
  • This function call is already defined in user_code.c.
• void os_pwm_duty_cycle (uint8_t i, uint16_t pwm_promille, uint16_t pwm_frequency, uint16_t pwm_dither_promille, uint16_t pwm_dither_frequency)
  • set the output of a PWM capable I/O pin
  • Parameters
    • i, select the HSD output pin.
    • pwm_promille, set the PWM ducty cycle in thousands, 0-1000 for 0-100 percent
    • pwm_frequency, set the output frequency in hertz
    • pwm_dither_promille, set the dither amplitude in thousands, set to "0" if not needed
    • pwm_dither_frequency, set the dither frequency. Must be lower than pwm_promille. Set to "0" if not needed
• void os_time_past(uint32_t time_val, uint8_t time, OS_1ms)
  • check if time in milliseconds has elapsed since ```time_val``
• void os_timestamp(*uint32_t time_val, OS_1ms)
  • stamp the current time in ms to time_val

Example Code

• Set OUT_HSD0 with a PWM of 200hz and 45% duty cycle. No dither.

os_pwm_duty_cycle(OUT_HSD0, 450, 200, 0, 0);

• Check if 500ms have passed since last timestamp

if( os_time_past(time_val, 500, OS_1ms) )
{
    // if the time passed, set "time_val" to a new timestamp to record new time
    os_timestamp(&time_val, OS_1ms);
}