how to make PWM pulse in both channels

[karan]

Hi

i wrote the program which is making pulse one time on channel 0 and then followed by channel 1 and then again channel 0 and then 1 going on , my aim is to create pulses on both channel at the same time i tested by conencting buzzer on pin 6 and pin 7 so can anyone help me how to create that any help will be appreicated

Thank you

main.c

[Ole Bauck]

The pulses will not be totally synchronous if you use the driver. The driver can only set one channel at the time. You could use app_pwm_disable, but also here the output is set sequentially, so you will have an interval in time where one pin is high and the other is low. bottom line: You cannot do this with the pwm driver.

[karan]

/* 2-channel PWM, 200Hz, output on DK LED pins. */

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(5000L, 6, 7);

/* Switch the polarity of the second channel. */
pwm1_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_HIGH;
pwm1_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH; 
/* Initialize and enable PWM. */
err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_ready_callback);
APP_ERROR_CHECK(err_code);
app_pwm_enable(&PWM1);

uint32_t value;
while(true)
{
    for (uint8_t i = 0; i < 40; ++i)
    {
        value = (i < 20) ? (i * 5) : (100 - (i - 20) * 5);
        
        ready_flag = false;
        /* Set the duty cycle - keep trying until PWM is ready... */
        while (app_pwm_channel_duty_set(&PWM1, 0, value) == NRF_ERROR_BUSY);
        
        /* ... or wait for callback. */
        while(!ready_flag);
        APP_ERROR_CHECK(app_pwm_channel_duty_set(&PWM1, 1, value));
        nrf_delay_ms(25);
    }
}

}