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Forum Index : Microcontroller and PC projects : PicoMite RP2350B Fail CY43

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Hansaplast
Newbie

Joined: 13/07/2023
Location: Hong Kong
Posts: 15
Posted: 10:08am 01 Apr 2026
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Hello

Why I get the following situation with the RP2350B Tiny XL Board?

option list
WebMite MMBasic RP2350B Edition V6.01.00
OPTION FLASH SIZE 16777216
OPTION COLOURCODE ON
OPTION PICO OFF
OPTION CPUSPEED (KHz) 200000
OPTION HEARTBEAT PIN â
'
> [CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43
[CYW43] Failed to start CYW43

17:46:02 Port: COM4 removed

Disconnected


Same Failure with RP2350B Edition V6.02.00 and RP2350B Edition V6.02.01

Nice wishes.....
Edited 2026-04-01 20:10 by Hansaplast
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 11215
Posted: 11:25am 01 Apr 2026
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Does the board even have a CYW43 and is it wired to the same pins as a Pico2-W ? If not use the standard PicoMiteRP2350 firmware?
 
Hansaplast
Newbie

Joined: 13/07/2023
Location: Hong Kong
Posts: 15
Posted: 11:40pm 01 Apr 2026
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Hello matherp

Sorry my fault,, load wrong firmware.

But there is a BUG in the PicoMiteRP2350V6.02.01.uf2 firmware,,, CPUSPEED is set to 200000 (kHz) and must be set to 150000 (kHz).

Regards
Thank you for your support
 
lizby
Guru

Joined: 17/05/2016
Location: United States
Posts: 3742
Posted: 12:03am 02 Apr 2026
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  Hansaplast said  But there is a BUG in the PicoMiteRP2350V6.02.01.uf2 firmware,,, CPUSPEED is set to 200000 (kHz) and must be set to 150000 (kHz).


Why do you think that? 150000 may be the Raspberry Pi recommendation, but 200000 has been found to be very stable, and I have a RP2350B running at 340000 without any issues.
PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on FOTS
 
PhenixRising
Guru

Joined: 07/11/2023
Location: United Kingdom
Posts: 1849
Posted: 12:22am 02 Apr 2026
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  Hansaplast said  Hello matherp

Sorry my fault,, load wrong firmware.

But there is a BUG in the PicoMiteRP2350V6.02.01.uf2 firmware,,, CPUSPEED is set to 200000 (kHz) and must be set to 150000 (kHz).

Regards
Thank you for your support


If you want to change it:

  Quote  

>OPTION CPUSPEED 150000
 
phil99

Guru

Joined: 11/02/2018
Location: Australia
Posts: 3156
Posted: 01:05am 02 Apr 2026
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The "official" CPU speed is overly conservative.

The 3 CPU speed options for the PicoMite VGA firmware are 252MHz, 315MHz and 378MHz and have never encountered a problem at 378MHz.
So I use 378MHz for the standard PicoMites as well, though some are stable at 420MHz.
  manual said  OPTION CPUSPEED speed 
NOT ON HDMI OR VGA VERSIONS
Change the CPU clock speed.
‘speed’ is the CPU clock in KHz in the range of 48000 to 420000. Speeds above 200MHz (150MHz for the RP2350) are regarded as overclocking as that is the specified maximum speed of the standard Raspberry Pi Pico.
Default speed is 200000 for the RP2040 and 150000 for the RP2350.
This command must be run at the command prompt (not in a program).

Edited 2026-04-02 12:25 by phil99
 
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