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palcal

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Joined: 12/10/2011
Location: Australia
Posts: 1993

Posted: 06:15am 27 Oct 2021

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I had a Pico with code in it to run a survielance camera. All was working Ok, until...
I wanted to run from a battery so in my code I put 'Option CPUspeed 48000' to lower the current draw. Since then it's dead, the chip appears to flash OK but then I can't connect in TeraTerm. There was nothing on any of the pins that could draw too much current, its just odd that it happened after I changed the CPUspeed. I will use a new Pico but don't want to brick another one.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 5089

Posted: 06:20am 27 Oct 2021

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Hi Pascal,

What firmware did you run on it ? A beta or alpha release ?
Maybe re-flash using the official release ?
I did try different clock frequencies with one of the alpha releases (both 48M and above 125M, 200 and 250 I think) and could connect.

Regards,

Volhout

PicomiteVGA PETSCII ROBOTS

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7937

Posted: 06:45am 27 Oct 2021

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If you suspect it's dead try loading the "flash_nuke.uf2" program to wipe everything in flash then try again. I've never had to resort to this though.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 1993

Posted: 08:32am 27 Oct 2021

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I loaded "flash_nuke", I then loaded the alpha firmware, I now have the heartbeat LED flashing but still no serial connection.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7937

Posted: 09:31am 27 Oct 2021

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So...
The USB link can work or you couldn't have loaded the firmware.
The 'mite has booted and is running.
I'd suggest that you unplug it, reboot the PC, plug it in again & then run Tera Term (accepting the defaults). Press Enter and see if you get a prompt.

EDIT:
Just one thing - when you start Tera Term make sure that the right COM port is shown, otherwise it won't connect! :)

The current version is 5.07.00b30 by the way. It might be an idea to try that as it reconnects to USB more easily.
Edited 2021-10-27 19:58 by Mixtel90

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 1993

Posted: 07:48pm 27 Oct 2021

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Thank for the help, loaded the latest beta and it's working. Don't really know what fixed it but it's a goer.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 7937

Posted: 07:57pm 27 Oct 2021

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Excellent! :)
These things seem to be quite rugged.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 1993

Posted: 08:41pm 27 Oct 2021

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Deleted!
Edited 2021-10-28 06:46 by palcal

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

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