How to operate PWM and softdevice at the same time?

[Mac]

I`m trying to operate PWM and soft device at the same time. I have to make 4 Mhz using PWM block so I checked the PWM driver. There is no problem when using peripheral/pwmdriver.

However,when I applied pwm driver to ble_app_uart example, pwm driver code caused reboot. I can`t use app_timer because of clock frequency. How to overcome this problem?

Here is my pwm function.

WM

void EnableClock(void)
{
    uint32_t                   err_code;
    nrf_drv_pwm_config_t const config0 =
    {
        .output_pins =
        {
            SEOS_CLOCK_PIN | NRF_DRV_PWM_PIN_INVERTED, // channel 0 ->   BSP_LED_0 | NRF_DRV_PWM_PIN_INVERTED,
        },
        .irq_priority = APP_IRQ_PRIORITY_LOW,
        .base_clock   = NRF_PWM_CLK_16MHz,
        .count_mode   = NRF_PWM_MODE_UP_AND_DOWN,
        .top_value    = 2,
        .load_mode    = NRF_PWM_LOAD_INDIVIDUAL,
        .step_mode    = NRF_PWM_STEP_TRIGGERED
    };
    err_code = nrf_drv_pwm_init(&m_pwm0, &config0, NULL);
    APP_ERROR_CHECK(err_code);
    m_used |= USED_PWM(0);

    static nrf_pwm_values_individual_t  /*const*/ seq_values[1] =
    {
        { 1 },
    };
    
    nrf_pwm_sequence_t const seq =
    {
        .values.p_individual = seq_values,
        .length              = NRF_PWM_VALUES_LENGTH(seq_values),
        .repeats             = 0,
        .end_delay           = 0
    };
    nrf_drv_pwm_simple_playback(&m_pwm0, &seq, 1, NRF_DRV_PWM_FLAG_LOOP);
}

[Stefan Birnir Sverrisson]

Hi Mac

The top value has minimum value of 3. That is stated in the PWM COUNTERTOP register. If you want to make 4MHz square wave, you can do that with TIMER+PPI+GPIOTE, similar to what is done in the gpiote example in the SDK, just with higher frequency.