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   MSGID:  92106b52   
   REPLY:  02d970cc   
   PID: SoupGate-Win32 v1.05   
   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   
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