Subj : Re: RP2040 reset idea To : tnp@invalid.invalid From : john larkin Date : Tue Sep 17 2024 09:09:28 XPost: sci.electronics.design On Tue, 17 Sep 2024 11:07:17 +0100, The Natural Philosopher wrote: >On 17/09/2024 03:58, john larkin wrote: >> The RP2040 has a cool mode where it can be made to boot up with the >> USB port looking like a memory stick. That's great for software >> installs or upgrades. The Pico board has a BOOT button on the board; >> if the pico is powered up with the button pushed, it goes into that >> boot mode. >> >> But if I have a product (actually a family of products) in a nice >> aluminum box, a user would have to remove the top cover, remove all >> power sources (there can be three), and hold the button down while >> reconnecting power. >> >> Some of my customers also want to lock a box such that it's impossible >> to write to any nonvolatile memory while it's in a secure area. >> >> So here's an idea: a small hole in the box allows a toothpick or a >> paper clip to push a button. A short push is a regular reset. A long >> push is a memory-stick mode boot. We can have a rotary switch LOCK >> hole too. >> >Thats' what my PICO powered thermostats have. For the onboard button though >Resetting is done by pulling the power. > >The point is that if you do power up with the button pressed, you wipe >the entire FLASH RAM I think. > My Pi guy verifies that entering boot mode doesn't change the contents of flash. Power cycle and things run like before. You had me worried! --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .