Change the pwm frequency

[muyang]

hi, I follow the pwm routine, 51822 can work and output pwm, when I want to change the frequency of pwm encountered a problem, the program reset. I use the method when i need to change the pwm frequency when i reinitialize pwm_init

void Motor_Pwm_Init(uint32_t freq,uint32_t MotorLeft_Polarity,uint32_t MotorRight_Polarity)
{

	uint32_t err_code;

	app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(freq,MOTOR_LEFT_PIN,MOTOT_RIGHT_PIN); //set pwm frequency	
	
	pwm1_cfg.pin_polarity[0] = MotorLeft_Polarity;	 //Polarity of active state on pin.
    pwm1_cfg.pin_polarity[1] = MotorRight_Polarity;
	
	err_code = app_pwm_init(&PWM1,&pwm1_cfg,NULL);																						//  Init the PWM
    APP_ERROR_CHECK(err_code);

	app_pwm_enable(&PWM1);	
	
}

uint8_t Motor_Duty_Set(uint32_t DutyLeft,uint32_t DutyRight)
{
	uint8_t TimeOut = 0;
	
	while (app_pwm_channel_duty_set(&PWM1,(uint8_t) 0, DutyLeft) == NRF_ERROR_BUSY)

}

[Sigurd]

Hi,

Note that you don’t need to reinitialize the PWM in order to change the duty cycle. A reset indicates that you are running into the error handler, where the default behavior is to do a reset. You should then debug in order to find the reason for the reset. See this post about debugging

[muyang]

Duty cycle can be modified, my question is how to modify the frequency

[muyang]

I can think of the way is to re-initialize pwm, but I re-initialize pwm when there was a reset

[Sigurd]

Yes, if you want to change the PWM frequency on the nRF51 you will need to re-initialize the PWM. Remember to call app_pwm_disable(..) and app_pwm_uninit(..) before calling app_pwm_init(...) and app_pwm_enable(..) again with the new configuration. If the device is still resetting, try debugging to find the error code.

[muyang]

Thanks for your answer, I try to do it the way you do it