I tried to add Timer in the example "ble_app_uart"...

[tony55723]

Hello ,

I use SDK 15.3 , chip is 52811

I refer to the example of 52840 "examples \ peripheral \ timer"

The following is the example code, I have not changed it.

const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0);

void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context) 
{
    static uint32_t i;
    uint32_t led_to_invert = ((i++) % LEDS_NUMBER);

    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE0:
            bsp_board_led_invert(led_to_invert);
            break;

        default:
            //Do nothing.
            break;
    }
}

int main(void)
{
    uint32_t time_ms = 500; //Time(in miliseconds) between consecutive compare events.
    uint32_t time_ticks;
    uint32_t err_code = NRF_SUCCESS;

    bsp_board_init(BSP_INIT_LEDS); // Configure all leds on board.

    //Configure TIMER_LED for generating simple light effect - leds on board will invert his state one after the other.
    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    err_code = nrf_drv_timer_init(&TIMER_LED, &timer_cfg, timer_led_event_handler);
    APP_ERROR_CHECK(err_code);

    time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);

    nrf_drv_timer_extended_compare(
         &TIMER_LED, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);

    nrf_drv_timer_enable(&TIMER_LED);

    while (1)
    {
        __WFI();
    }
}

Than, I am trying to add a Timer code to my project "ble_app_uart"

After adding main.c, I only modified 3 places.

/* ----- Timer1 ----- */
const nrf_drv_timer_t TIMER1_SPI_W25Q16 = NRF_DRV_TIMER_INSTANCE(1);

/* ----- I want USART Output ----- */
void timer_event_handler(nrf_timer_event_t event_type, void* p_context)
{
    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE0:
						app_uart_put(0x01);
            break;

        default:
            //Do nothing.
            break;
    }
}

/* -----Maybe channel 0 corresponds to Timer0, I changed to channel 1 ----- */
nrf_drv_timer_extended_compare(
         &TIMER1_SPI_W25Q16, NRF_TIMER_CC_CHANNEL1, time_ticks, NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK, true);

And, sdk_config.h

Am I still missing a step? So Timer1 is not executed?

In addition, I would like to ask, what is NRFX?

Because there are two, "NRFX_TIMER_ENABLE" and "TIMER_ENABLED"

Thanks.

[tony55723]

nrf_drv_timer_extended_compare(
         &TIMER_LED, NRF_TIMER_CC_CHANNEL1, time_ticks, NRF_TIMER_SHORT_COMPARE1_CLEAR_MASK, true);
         
         

Sorry, copy too fast , it's TIMER_LED

example is NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, I change to COMPARE1

[tony55723]

And example "ble_app_uart" use Timer0 ?

So , I ues Timer1, this will not create conflict.

Thanks

[Simon]

The reason it doesn't work is because you are trying to use TIMER0, since it is used by the softdevice. Try using TIMER1 or TIMER2 instead.

Best regards,

Simon

[tony55723]

Hi,

Thank you for your reply

OK, I seem to remember that there is something using Timer0.

Confirm now that it is softDevice

So, I tried to change and use Timer1 to implement the function.

In my question and reply, this is where I think of all the things I need to change.

Which step did I have missing?

====================

Another question, I want to know what is "NRFX"?

In sdk_config.h, Timer have two, "NRFX_TIMER_ENABLE" and "TIMER_ENABLED"

What is the difference between them?

Thank you

[Simon]

Take a look at this ticket, where I give an explanation of the difference.

If I am not mistaken, you should not use the NRFX definitions and functions directly, as this is not the intention of it. In SDK 15.x.x, some higher layer API is always used on top of it. In NCS, the NRFX API is also used, but the Zephyr API is always used on top of it.

Best regards,

Simon