Lup Yuen Lee 李立源 @lupyuen@qoto.org

Learn from Your Mistakes ... Building a Sailfish OS app

https://olavihaapala.fi/2021/03/23/learn-from-your-mistakes.html

@PawelK Suez Canal is a major shipping route ... Many things shipped by sea depend on it

https://en.m.wikipedia.org/wiki/Suez_Canal

#PineCone #BL602 @PINE64 receives #LoRa Packets from RAKwireless #WisBlock ... Almost finished! One more thang ...

https://youtu.be/3TSvo0dwwnQ

@PawelK Erm the world depends on Suez Canal

Suez Canal blocked by massive cargo ship

https://www.channelnewsasia.com/news/world/suez-canal-ever-given-ship-stuck-block-route-traffic-jam-14477910

@jens Yep correct! See this https://qoto.org/@lupyuen/105942966628319435

@PawelK Thanks for saying that on my behalf 😉

Wow I gotta be careful when reposting articles 🤔

https://www.channelnewsasia.com/news/singapore/pm-lee-leong-sze-hian-blogger-133000-defamation-sharing-article-14478210

Free software advocates seek removal of Richard Stallman and entire FSF board

https://arstechnica.com/tech-policy/2021/03/free-software-advocates-seek-removal-of-richard-stallman-and-entire-fsf-board/

Back to our #BL602 Stack Trace ... Yep the Correct Stack Trace is indeed lurking behind our (unhelpful) Exception Stack Trace ... How shall we show the Correct Stack Trace beyond the Emptiness? 🤔

https://gist.github.com/lupyuen/5ddbcdd1054c775521291c3d114f6cee

Here's how we fixed the #BL602 Exception for #LoRa Channel Activity Detection ... Always init Stack Variables! 🙏

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c#L127-L143

Answer: "radio_events" contains Undefined Fields ... Because it was allocated on the Stack! Lesson Learnt: ALWAYS Init Stack Variables! 🙏

https://github.com/apache/mynewt-core/blob/master/apps/loraping/src/main.c#L215-L233

Quiz: What's wrong with this C code? 🤔 ... I'm soooo upset I missed this simple bug 🙄

https://github.com/apache/mynewt-core/blob/master/apps/loraping/src/main.c#L215-L233

Below the #BL602 Exception Handler Stack ... Is another Stack! ... Does this Stack contain the Stack Trace that we need? 🤔

https://gist.github.com/lupyuen/5ddbcdd1054c775521291c3d114f6cee

Complete #BL602 Stack Data for the Exception is here

https://gist.github.com/lupyuen/5ddbcdd1054c775521291c3d114f6cee

Here are the #BL602 Stacks for the Foreground RTOS Task, Background Task and Exception Handler ... Let's see what's wrong with the Exception Stack

https://github.com/lupyuen/bl_iot_sdk/blob/lorarecv/customer_app/sdk_app_lora/sdk_app_lora/demo.c#L469-L488