Search found 438 matches

by pjde
Sat Apr 20, 2019 12:16 am
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

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: 22
Views: 1003

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: 22
Views: 1003

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: 22
Views: 1003

Re: i2s and digital microphones

Quick question to Piotr.

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

Regards

Paul
by pjde
Wed Apr 10, 2019 10:29 pm
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

Re: i2s and digital microphones

Hi Garry

Have been looking through the DMA code.

The DMATransferRequestEx() requires a DMAHost value. Is there a default value we can use for all transfers or do we need to create our own for our specfic tasks.

Regards

Paul
by pjde
Tue Apr 09, 2019 7:02 am
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

Re: i2s and digital microphones

Thanks Garry

Getting a little more translucent.

Do any of the examples use the Ultibo DMA functions? I did a quick text search but nothing came up.

Regards

Paul
by pjde
Mon Apr 08, 2019 8:38 pm
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

Re: i2s and digital microphones

Thanks Piotr

Clear as mud. I have a bit more research to do.

Regards

Paul
by pjde
Mon Apr 08, 2019 7:16 am
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

Re: i2s and digital microphones

Hi Piotr Currently looking through the code. I have one question at the moment regarding the base address for DMA channels. According to the BCM 2835 and 2837 ARM Peripheral documents the base for the DMA channels is $7E00700 but if I read it correctly, your code uses (_dma_cs) $3F007000. // DMA con...
by pjde
Sun Apr 07, 2019 6:45 am
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

Re: i2s and digital microphones

Thanks Piotr

I will give it a try.

Regards

Paul
by pjde
Sun Apr 07, 2019 1:35 am
Forum: General
Topic: i2s and digital microphones
Replies: 22
Views: 1003

Re: i2s and digital microphones

I am looking to get the PiFi DAC+ v2.0 working with Ultibo.

In order not to re-invent the wheel, is it possible to get any prelim code on I2s however unfinished it is?

Regards

Paul

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