Is it possible to use a Timer Task for PPI event ?

[Sylvain]

Hello Nordic developer,

I'm asking my self if it's possible to use a task of one timer like STOP TASK or START TASK as PPI event ?

For example, like that :

    /* Configure 3nd available PPI channel to enable PPI channel2 and to disable PPI channel1 on TIMER1 start event.
    */
    err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel3);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_ppi_channel_assign(m_ppi_channel3,
                                          nrf_drv_timer_event_address_get(&m_timer1,NRF_TIMER_TASK_START),
                                          nrf_drv_ppi_task_addr_get(NRF_PPI_TASK_CHG2_EN));
    
    err_code = nrf_drv_ppi_channel_fork_assign (m_ppi_channel3, nrf_drv_ppi_task_addr_get(NRF_PPI_TASK_CHG1_DIS));
    APP_ERROR_CHECK(err_code);

I expect that's not possible since the return address of the function : "nrf_drv_timer_event_address_get(&m_timer1,NRF_TIMER_TASK_START)" is 0 (viewed in debug mode).

Anyone could confirm that ?

Best regards,
Sylvain.

[FormerMember]

Since NRF_TIMER_TASK_START is a task, it is not possible to assign it as an event. 

If you want to trigger a task when the timer has started, you can use capture and compare: Set capture value to '1', and use the EVENTS_COMPARE to receive an even when the timer has started.

[Sylvain]

Hello Kristin,

Good idea, thank you for the tip.

Sincerely,
Sylvain