Rob Meades

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7 years, 1 month ago.

rt_suspend()/rt_resume() and deepsleep()

I'm trying to implement some code which does the following:

  1. Sets an RTC alarm,
  2. Suspends RTX with rt_suspend(),
  3. Calls deepsleep(),
  4. Resumes RTX with rt_resume() when the alarm wakes things up, telling it for how many RTX intervals it has been asleep.

(1) and (3) work fine, I can deep sleep and wake up on an RTC alarm, all is good. I can also do (4) (with a zero value for the sleep time) and that works. My problem is with (2), the rt_suspend() call.

As soon as I do (2) I never wake up from deep sleep. I can see nothing in deepsleep() that would call RTOS functions and nothing in rt_suspend() that would affect the HW state.

Can anyone suggest what I'm doing wrong?

I have a subsequent question (once this is working), which is how can I figure out the RTX-tick duration for the sleep is? I understand that rt_suspend() returns the next RTX timing event but I don't care about that (I'm gonna sleep anyway).

This is on an STM32F437 micro running on an Odin module with mbed as at commit 3a27568 (6 days ago).

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