app_timer_irq_priority interfering with UARTE0 & UARTE1

[sheddanl]

I am currently making a program that will interpret serial commands from UARTE1 and then send + read something from the other (UARTE0). Previously, when I have been using a single UARTE I have had no problem setting up an app_timer and waiting for it to expire while waiting for a full "message" from the UARTE (indicated by a newline).

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static ret_code_t myTimerTimeoutSetup(uint32_t timeout_ms, my_timer_timeout_t* p_tout_ctx)

{

uint32_t ticks = APP_TIMER_TICKS(timeout_ms);

if (ticks < APP_TIMER_MIN_TIMEOUT_TICKS)

{

p_tout_ctx->expired = true;

return NRF_SUCCESS;

}

ret_code_t ret = app_timer_create(&my_timer_id,

APP_TIMER_MODE_SINGLE_SHOT,

fc_adafruitFonaTimeoutHandler);

APP_ERROR_CHECK(ret);

// If the timer is failed to be created, return the error code

if (ret != NRF_SUCCESS)

{

return ret;

}

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static ret_code_t myTimerTimeoutSetup(uint32_t timeout_ms, my_timer_timeout_t* p_tout_ctx)
{
    uint32_t ticks = APP_TIMER_TICKS(timeout_ms);

    if (ticks < APP_TIMER_MIN_TIMEOUT_TICKS)
    {
        p_tout_ctx->expired = true;
        return NRF_SUCCESS;
    }

    ret_code_t ret = app_timer_create(&my_timer_id,
        APP_TIMER_MODE_SINGLE_SHOT,
        fc_adafruitFonaTimeoutHandler);

    APP_ERROR_CHECK(ret);

    // If the timer is failed to be created, return the error code
    if (ret != NRF_SUCCESS)
    {
        return ret;
    }

    return app_timer_start(my_timer_id, ticks, p_tout_ctx);
}

much like is done in nrf_serial, I then have a statement such as: if (tout_ctx.expired) break; in my while loop to break when time is up.

Now that I am using both UARTEs, both of them freeze (when they should transmitting data) until the timer has expired, on which they will finish transmitting (nrf_serial_write). I have also had trouble with the timer never expiring if the interrupt priority is set to the default 6.

Is this an IRQ priority issue?

Thanks very much