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ManiB
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Joined: 12/10/2019
Location: Germany
Posts: 106

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: 10066

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: 106

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: 10066

Posted: 05:49pm 24 Apr 2025

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OPTION PSRAM PIN GP47

ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 106

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: 106

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: 147

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

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Joined: 18/12/2014
Location: Australia
Posts: 971

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

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