Subj : Re: RP2040 reset idea
To   : john larkin
From : The Natural Philosopher
Date : Tue Sep 17 2024 17:21:36

XPost: sci.electronics.design

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...


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