nRF5340DK PWM mess with zephyr

[Nicolas Brunner]

Using NCS v1.4.99-dev1.

I have no problem using the PWM with a nRF5340PDK but when i tried it on a nRF5340DK, my program was not working correctly.

I have made a simple example to demonstrate this behavior, 1 LED should blink with PWM and another with the main thread:

Fullscreen 648052.main.c Download

/* Includes ------------------------------------------------------------------*/

#include <assert.h>

#include <zephyr.h>

#include <nrfx_pwm.h>
#include <hal/nrf_gpio.h>

/* Private define ------------------------------------------------------------*/

#define LED1_PIN                   NRF_GPIO_PIN_MAP(0,28)
#define LED2_PIN                   NRF_GPIO_PIN_MAP(0,29)
#define LED3_PIN                   NRF_GPIO_PIN_MAP(0,30)
#define LED4_PIN                   NRF_GPIO_PIN_MAP(0,31)

#define PERIOD 25000

#define PWM_DEFAULT_CONFIG_IRQ_PRIORITY 6

/* Private variables ---------------------------------------------------------*/

static nrfx_pwm_t pwm = NRFX_PWM_INSTANCE(1);

static nrf_pwm_values_individual_t sequenceValues[] = {
        {PERIOD / 2, 0x8000 + PERIOD / 2},
};

static nrf_pwm_sequence_t sequence = {
        .values.p_individual = sequenceValues,
        .length              = NRF_PWM_VALUES_LENGTH(sequenceValues),
        .repeats             = 0,
        .end_delay           = 0
};

/* Public functions ----------------------------------------------------------*/

void pwm_init(void)
{
    nrfx_pwm_config_t config = {
            .irq_priority = PWM_DEFAULT_CONFIG_IRQ_PRIORITY,
            .base_clock   = NRF_PWM_CLK_125kHz,
            .count_mode   = NRF_PWM_MODE_UP,
            .top_value    = PERIOD,
            .load_mode    = NRF_PWM_LOAD_INDIVIDUAL,
            .step_mode    = NRF_PWM_STEP_AUTO,
            .output_pins[0] = LED2_PIN,
    };

    nrfx_err_t err = nrfx_pwm_init(&pwm, &config, NULL, NULL);
    assert(err == NRFX_SUCCESS);

    nrfx_pwm_simple_playback(&pwm, &sequence, 1, NRFX_PWM_FLAG_LOOP);
}

void main(void)
{
    pwm_init();

    nrf_gpio_cfg_output(LED1_PIN);

    while(1) {
        nrf_gpio_pin_write(LED1_PIN, 1);
        k_sleep(K_MSEC(100));

        nrf_gpio_pin_write(LED1_PIN, 0);
        k_sleep(K_MSEC(100));
    }
}

0246.prj.conf

With a nRF5340PDK, both LED blink but with a nRF5340DK, the LED1 don't blink.