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Forum Index : Microcontroller and PC projects : PM:VGA - How to erase your code without asking....
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
This is interesting. PM VGA, FW version 5.07.04b7 3v3_EN pin tied LOW - external linear PSU via diode as per Pico manual in the power section. 1) Run your code WITH USB CABLE CONNECTED. 2) Remove the USB cable. 3) Connect the USB cable. 4) PM VGA reboots, but code is ERASED. Not a problem, as we all use backups don't we  , so reloading is no problem, but the fact this happens with NO warning is a concern - just by connecting the USB cable.I have not at this point, even tried to connect to it using a terminal, just plugging in the USB cable, reboots and WIPES the code in memory. Anyone else seen this? Please remember - I am using an EXTERNAL linear regulator and 3v3_EN is grounded to disable the on-board regulator, and I also have the series diode as per the Pico manual. Even so, I would not have thought that this could trigger a total erasure of the code in memory, no warnings, no nothing, it just reboots and the code is GONE. Thoughts? Comments? Perhaps I need to upgrade my version of the FW on this module? It's hard to keep track of all the new updates!  5.07.04b7 - is that out of date now? It very well may be.... Smoke makes things work. When the smoke gets out, it stops! |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
If your external supply is diode-isolated and feeding VSYS then either VBUS or the external supply will be used *to power the switcher*, so grounding 3VEN will tun off the 3V3 supply and hence the Pico. If you use an external 3V3 supply you can feed 3V3 from it directly (no diode) but only while 3V3EN is grounded to disable the output from the switcher. In this case it doesn't matter what you do with VBUS or VSYS as they are doing nothing. :) If you try to feed 3V3 into the 3V3 pin via a diode then you will have the diode voltage drop and you won't get the full 3V3 at the pin. Edited 2023-05-23 17:40 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9129 |
This was a known bug discussed previously and was fixed many moons ago. You need to update your firmware |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9308 |
YAY! Thanks Mick and Peter. I have been so busy of late, I simply have not had the time to study up on the constant improvements to the FW!  I will update and move on. Smoke makes things work. When the smoke gets out, it stops! |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3805 |
The released version (V5.07.07) is on Geoff's site. John |
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