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Forum Index : Microcontroller and PC projects : PicoMiteHDMIUSB motherboard reference design

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ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 120
Posted: 09:24pm 23 Apr 2025
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This is the wiring diagram for DVPP supply:



Component: U34 - TPS7A7002DDAR

This is a low dropout linear regulator (LDO) from Texas Instruments.

But what value should DVDD be set to?
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10088
Posted: 09:39pm 23 Apr 2025
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Can anyone else tell me what I need to do to ensure that the date and time are not lost after switching off?

set the time "RTC SETTIME"

  Quote  But what value should DVDD be set to?


1.3V for 1280P, less if you don't want to run that fast
 
ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 120
Posted: 05:26pm 24 Apr 2025
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  matherp said  Can anyone else tell me what I need to do to ensure that the date and time are not lost after switching off?

set the time "RTC SETTIME"

  Quote  But what value should DVDD be set to?


1.3V for 1280P, less if you don't want to run that fast


Thanks Peter, thas was the solution.

I've soldered in the PSRAM now in one board (U33).

How can I test it?

This is the description in the manual:
OPTION PSRAM PIN n   Enable/disable PSRAM support.
or                   ‘n’ is the PSRAM chip select (CS) pin and can be 0, 8, 19, or 47.
OPTION PSRAM DISABLE Typically GP47 is used for Pimoroni boards. Default is disabled.


Note: It seemed there is only GP0 available.
Edited 2025-04-25 03:36 by ManiB
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10088
Posted: 05:49pm 24 Apr 2025
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OPTION PSRAM PIN GP47
 
ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 120
Posted: 06:03pm 24 Apr 2025
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  matherp said  OPTION PSRAM PIN GP47


Thanks, now it shows: "Totalof 6 Mbytes PSRAM available"

> memory
Program:
  2K ( 1%) Program (95 lines)
182K (99%) Free

Saved Variables:
 16K (100%) Free

RAM:
  0K ( 0%) 0 Variables
  0K ( 0%) General
6376K (100%) Free
 
ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 120
Posted: 08:05am 28 Apr 2025
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  PilotPirx said  @ManiB
If you order a batch from JLCPCB (5 pieces), I would be interested in a circuit board. Shipping within Germany should not be a problem. Could I buy it from you?


Hello PilotPirx,

your board is assembled, tested and ready for shipping.

I've sent you a PM ;)

Manfred
 
Hawk

Senior Member

Joined: 15/07/2021
Location: Australia
Posts: 148
Posted: 02:54am 08 May 2025
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Did anyone in Australia get a batch of these made?

I’m keen to get one, but will only get a batch made if it hasn’t already been done.

Cheers
 
disco4now

Guru

Joined: 18/12/2014
Location: Australia
Posts: 983
Posted: 03:41am 08 May 2025
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I got a batch made of the earlier ones with PWM audio. They have the good USB Hub chip.I have three that can go if anyone in AU wants one. PM me if interested.
Latest F4 Latest H7 FotS
 
cdeagle
Senior Member

Joined: 22/06/2014
Location: United States
Posts: 265
Posted: 09:34am 08 May 2025
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I would like to buy one of Peter's latest assembled motherboards. I'm in the US and will pay for shipping.

PM if willing to make this sale. Thanks
 
Hawk

Senior Member

Joined: 15/07/2021
Location: Australia
Posts: 148
Posted: 07:23am 10 May 2025
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  disco4now said  I got a batch made of the earlier ones with PWM audio. They have the good USB Hub chip.I have three that can go if anyone in AU wants one. PM me if interested.


PM sent.
 
PilotPirx

Regular Member

Joined: 03/11/2020
Location: Germany
Posts: 98
Posted: 07:24am 13 May 2025
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I have now received the great PicoMiteHDMIUSB from ManiB and am delighted with the quality.
With housing, white labeled front panels, white circuit board, 6MB PSRAM, SD card and all the necessary settings.
I tested it straight away with an old Apple keyboard (German: Krümelschublade) and it works fantastically. MP3 playback also works perfectly.

If I'd had something like this in my Sinclair Spectrum days....  (But it wouldn't have helped, there was no HDMI, USB, SD-card or VGA back then).
To anyone who is interested, I think ManiB still has one left.
Thanks Geoff and Peter for this great software and hardware.
You can see by now that a lot of work has gone into it.









Edited 2025-05-13 18:13 by PilotPirx
 
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