RTOS/CC2650: Problem with wakeup pins on the CC2650

Piotr Roszak

Intellectual 530 points

Part Number: CC2650

Tool/software: TI-RTOS

Hello,

I am configuring input pin of the CC2650 as the wakeup pins, with wakeup on the negative edge.

I have problems with the following wakeup sequence scenario:

1. wake up pin is LOW
2. shut down of the CC2650; pin is configured properly for wake up with the command:
PIN_setConfig(pinHandle, PINCC26XX_BM_WAKEUP, Board_WAKEUP_PIN | PINCC26XX_WAKEUP_NEGEDGE)
(returns PIN_SUCCESS status)
3. pin goes HIGH
4. pin goes LOW (negative edge event)

CC2650 is not woken up by this event. Looks like it is caused by the pin being low during shutdown. Is it the expected behaviour of the CC2650? Is there any way of waking up on the negative edge of the pin regardless of its state during MCU shutdown?

Thanks,
Piotr

over 8 years ago

0 YiKai Chen over 8 years ago

Guru 735685 points

Try to refer to e2e.ti.com/.../410883

0 Piotr Roszak over 8 years ago in reply to YiKai Chen

Intellectual 530 points

Hi,

Thanks for your response. However, I did not find the answer in that thread.

My problem is basically, that wake-up doesn't work when the event is set to negative edge and the pin is low during shutdown.

Thanks,
Piotr

0 YiKai Chen over 8 years ago in reply to Piotr Roszak

Guru 735685 points

If you try the example code provided by svendbt in e2e.ti.com/.../410883 , does it work?

0 Piotr Roszak over 8 years ago in reply to YiKai Chen

Intellectual 530 points

I found problem with my implementation. Now scenario that I described before works as expected - MCU is woken up on the negative edge even if the pin was low during shutdown.

However, I am having another problem when I configure 2 wake-up pins:

Scenario in this case is as follows:
- 2 wakeup pins configured before shutdown (pin1 and pin2), both on the negative edge
- pin1 is LOW during shutdown
- the MCU cannot be woken up by the negative edge of the pin2 if the pin1 stays LOW (after pin1 goes HIGH, negative edge of pin2 wakes up the CC2650 as expected)

Is this behavior correct? Looks like 2 wakeup pins depend on each other.

Thanks,
Piotr

0 Piotr Roszak over 8 years ago in reply to Piotr Roszak

Intellectual 530 points

Any thoughts? I can't figure out how to make 2 wakeup pins work independently..

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RTOS/CC2650: Problem with wakeup pins on the CC2650