timer events triggered in a row

RE: timer events triggered in a row

jy — Thu, 16 Nov 2017 11:56:05 GMT

however ... in combination with increasing APP_TIMER_PRESCALER from 0 to 32 and decreasing APP_TIMER_OP_QUEUE_SIZE ... I cannot make it fail anymore; any potential explanation? giving more time for handlers?

RE: timer events triggered in a row

jy — Thu, 16 Nov 2017 11:13:12 GMT

thx Kenneth for your prompt reply! unfortunately, it seems not sufficient ... following your hint, and looking at sdk12, I also tried to add rtc1_compare0_set(rtc1_counter_get()); + nrf_delay_us(100); + timer_timeouts_check_sched(); ... but still same issue

actually, the issue is not necessarily that it fires twice on the same timer, but that all remaining timer are considered as if timeout is 0.

RE: timer events triggered in a row

Kenneth — Thu, 16 Nov 2017 10:13:22 GMT

This is a possible issue in app_timer.c, that can cause the timeout handler to execute two times in a row. This has been fixed in later SDK. The workaround you can try:

Add a delay of 100us after timer_timeouts_check_sched() in compare_reg_update(), like this:

static void compare_reg_update(app_timer_id_t timer_id_head_old)
{
...
    timer_timeouts_check_sched();
    nrf_delay_us(100); // Add this delay.
...
}

Best regards, Kenneth