Dear,
As the example code is shown, I have been implementing on LED PWM through nRF53 GPIO0 12. If I set the brightness to 100, it was ON without any issue. However, if I set the brightness to other values other than 100, the output is zero which is no output.
So, I think that PWM was not properly generated and the signal is always static to zero or high with brightness 0 or 100.
err = led_set_brightness(led_pwm, 0, 100);
if (err < 0) {
LOG_ERR("err=%d brightness=%d\n", err, 50);
return;
}
When I narrowed down led_set_brightness function, this function is calling pwm_pin_set_cycles function which is generating PWM signal.
I guess that this pwm_pin_set_cycles is not generating PWM excep the static signals like low or high.
static int led_pwm_set_brightness(const struct device *dev,
uint32_t led, uint8_t value)
{
const struct led_pwm_config *config = DEV_CFG(dev);
struct led_pwm_data *data = DEV_DATA(dev);
const struct led_pwm *led_pwm;
uint32_t pulse;
if (led >= config->num_leds || value > 100) {
return -EINVAL;
}
led_pwm = &config->led[led];
pulse = led_pwm->period * value / 100;
printk("data[led].pwm=%x, led_pwm->channel=%x, led_pwm->period=%x, pulse=%x, led_pwm->flags=%x\n",
data[led].pwm, led_pwm->channel, led_pwm->period, pulse, led_pwm->flags);
return pwm_pin_set_cycles(data[led].pwm, led_pwm->channel,
led_pwm->period, pulse, led_pwm->flags);
}
Do you have any idea how I can verify pwm_pin_set_cycles to check if working or not? Is any configuration or setting required before using pwm_pin_set_cycles function?
FYI, my SoC is nRF5340 and DTS is using the configuration following:
pwmleds {
compatible = "pwm-leds";
edge_light: pwm_led_0 {
pwms = <&pwm0 12>;
label = "edge-led";
};
};
I appreciate any suggestions or ideas in advance if any.
Regards,
