It's those hundreds of pages which makes it a difficult challenge. It's not as simple as just reading it. We have witnessed people in this forum pointing to sections of it which appear to support their propositions but, like 'law', it's the whole which has to be understood, not just specific parts. Understanding the entire specification as a whole is a huge undertaking.The USB-PD spec is published in all is many hundred page glory... no need to guess or speculate... just read the spec.What we ideally need is someone who is fully knowledgeable about PD who can detail exactly what does happen with respect to PD negotiation, and how the Pi regulator, power button, and down-stream USB current and software interactions are in all scenarios.
Has anyone figured out yet why you can have a Pi 5 and an official Raspberry Pi 27W PD supply and it sometimes doen't deliver 5V@5A, only 5V@3A until the power supply has had its mains supply power cycled ?
On the face of it; that appears to be a sign of not being specification compliant, something other than expected behaviour.
Statistics: Posted by hippy — Mon Apr 08, 2024 2:37 pm