| Deutsch English Français Italiano |
|
<pf0kejtj8b8riu7aa73ma5700o4bj0mr3e@4ax.com> View for Bookmarking (what is this?) Look up another Usenet article |
Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: john larkin <jl@650pot.com> Newsgroups: comp.sys.raspberry-pi,sci.electronics.design Subject: Re: RP2040 reset idea Date: Tue, 17 Sep 2024 15:33:14 -0700 Organization: A noiseless patient Spider Lines: 55 Message-ID: <pf0kejtj8b8riu7aa73ma5700o4bj0mr3e@4ax.com> References: <biphejl03r86ebf5dkpcav9ud7u8vcjclj@4ax.com> <vcbkcl$3evhe$7@dont-email.me> <eaajej9hlmkdb4dbbdafiff63o549dlgas@4ax.com> <vccaag$3je29$4@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Wed, 18 Sep 2024 00:32:36 +0200 (CEST) Injection-Info: dont-email.me; posting-host="378033aed3ff8e5a111ea52e9148454b"; logging-data="3920348"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18GLEbHOFoWUmNkVuSKydpZ" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:1rluXsIh3c2o3mVBEYBzn/IaCk0= Bytes: 3162 On Tue, 17 Sep 2024 17:21:36 +0100, The Natural Philosopher <tnp@invalid.invalid> wrote: >On 17/09/2024 17:09, john larkin wrote: >> On Tue, 17 Sep 2024 11:07:17 +0100, The Natural Philosopher >> <tnp@invalid.invalid> 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! >> > >Really? > >I guess whenever I entered that mode it was to download fresh code... It looks like a USB memory stick. You can delete or add files if you want. It boots CPU 0 (the one we call Alice) from a file with the extension ..UL2 Why .UL2 one wonders. We'll put a bunch of files into the flash. Code for Bob, the 2nd CPU. An FPGA bitstream file. A prototype calibration table. A README file to explain everything in plain English.