LLWU Pin State

[astdom01]

Dear all

I use an external pin triggered on any edge as wakup source of the LLWU. After wakup I need to figure out if it was a raising- or a falling-edge. When I use a pin as LLWU-Souce I can not use the same pin as GPIO-Pin anymore (CodeWarrior with Processor-Expert). What is the best practice to find out if it was a falling- or raising-edge which triggered the wakeup? I have 2 ideas:

• Connect the signal to a second pin which I can use as GPIO-Pin and read the pin state after wakeup.
• I dont see in the reference Manual that a LLWU-Pin can not be used as GPIO-Pin as well - but the Processor-Export UI does not allow it. Maybe I can configure the pin manually as GPIO pin and use it that way

Please let me know your intentions about this Problem.

Thank you, Dominic

[antonioconcio · Accepted solution]

Hi Dominic,

You have to enable the "pin sharing" setting in order to use the same pin as GPIO in PEx.

Please refer to this post HERE.

Hope that helps,

Antonio

[astdom01]

Pin sharing works great!! Thank you :-)

[Alice_Yang]

Hi Dominic,

1)  You can config the Wakeup Pin Enable for llwu for rising edge/falling edge/ any change   in   LLWU_PE register.

2) I recommend you use the first idea,  also you can connect a led.  Even thought the pin as LLWU , while the state of the pin we can also check .

Hope it helps

Alice