Search found 444 matches

by pjde
Mon Jun 24, 2019 6:48 am
Forum: News
Topic: There is a RPi4 on the wild
Replies: 25
Views: 7844

Re: There is a RPi4 on the wild

Dual 4K HDMI displays.

Thats impressive.

Paul
by pjde
Mon Apr 29, 2019 7:19 am
Forum: Graphics
Topic: Colour Bar Generator
Replies: 0
Views: 3088

Colour Bar Generator

I needed a simple HDMI signal generator for testing some HDMI inputs in a function room, so wrote a very simple colour bar generator (PAL).

Anyone interested, it is at https://github.com/pjde-ultibo/Colour-Bars

Regards

Paul
by pjde
Sun Apr 28, 2019 5:35 am
Forum: Graphics
Topic: SDL
Replies: 15
Views: 4437

Re: SDL

If you want to try to incorporate SDL2 into Ultibo :- 1) Probably the best source repo is https://github.com/maccasoft/raspberry-pi/tree/master/SDL2 2) I found it a lot easier to "make" this on a linux / pi operating system rather than Windows (I used Stretch/Pixel). You also need to insta...
by pjde
Tue Apr 23, 2019 9:44 pm
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

Thanks Garry

I shall change it.

Regards

Paul
by pjde
Tue Apr 23, 2019 4:08 am
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

Thanks again Garry I think my DMA requests are correct now. (The transfer only completes if I set the I2S controller to master which is what I would expect). const PCM_REGS_BASE = BCM2837_PCM_REGS_BASE; // make board independent var AudioBuffer : pointer; AudioBufferSize : cardinal; res : LongWord; ...
by pjde
Mon Apr 22, 2019 10:27 pm
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

Thanks Garry The auto assignment should work fine for me. One further question. I am trying to use DMA to transfer from memory into the peripheral. What properties do I need to set to transfer 4 bytes at a time to the same destination peripheral register (4 memory locations). If I set the NOINCREMEN...
by pjde
Sat Apr 20, 2019 12:16 am
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

Apologies if I am missing the obvious but how do we specifiy the DMA channel we want to use in the DMATransferRequestEx function?

Regards

Paul
by pjde
Mon Apr 15, 2019 4:13 am
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

Thanks Garry

One step forward.

Regards

Paul
by pjde
Sun Apr 14, 2019 8:47 pm
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

2 more questions if I am not pushing my luck.

a) which clock is being used to generate the PCM_CLK
b) how is this connected to the actual GPIO output.

I have read the various sections of the Peripheral guide but can't find the relevant details.

Regards

Pauk
by pjde
Sun Apr 14, 2019 1:56 am
Forum: General
Topic: i2s and digital microphones
Replies: 27
Views: 5516

Re: i2s and digital microphones

Quick question to Piotr.

Can RetAMP Player be configured to use I2S to output the audio?

Regards

Paul

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