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by mgleason_3
Tue Oct 31, 2017 9:50 pm
Forum: General Discussion
Topic: I2S data corruption?
Replies: 14
Views: 2629

Re: I2S data corruption?

@ESP_Sprite - thanks again for looking at it. One quick question - is there a reference which explains I2S_COMM_FORMAT_PCM | I2S_COMM_FORMAT_PCM_LONG (vs I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB)? WRT Grounding: Oh boy, I should have thought of that :oops: I'd been trying to figure out why I wa...
by mgleason_3
Tue Oct 31, 2017 3:50 am
Forum: General Discussion
Topic: I2S data corruption?
Replies: 14
Views: 2629

Re: I2S data corruption?

Thanks ESP_Sprite! >> I'd like to see what your setup looks like. Not totally sure what you'd like, but I attached a picture of the setup. >> You're shuffling bits and forth at 3MHz; at rates like this the cabling gets somewhat important. I just ran a test at a much slower 8kHs x 16 x 2 = 256KHz. Th...
by mgleason_3
Mon Oct 09, 2017 11:03 pm
Forum: General Discussion
Topic: I2S digital audio amplifier board for ESP32 Vroom need recommendation
Replies: 8
Views: 1631

Re: I2S digital audio amplifier board for ESP32 Vroom need recommendation

Pointing out a couple things you may already know: The ESPs I2S apparently has a noise issue https://esp32.com/viewtopic.php?f=17&t=1026&p=4589&hilit=webradio+noise#p4523 The ESP32 has a built in DAC - though it's only 8-bit/low quality https://www.esp32.com/viewtopic.php?t=1339 One simple option to...
by mgleason_3
Thu Oct 05, 2017 7:58 pm
Forum: General Discussion
Topic: I2S data corruption?
Replies: 14
Views: 2629

Re: I2S data corruption?

Question for the Espressif team:

If you set .bits_per_sample to 24-bits, how is the data aligned in the returned buffer? is it padded out to 32-bits?
by mgleason_3
Mon Oct 02, 2017 9:20 pm
Forum: General Discussion
Topic: I2S data corruption?
Replies: 14
Views: 2629

Re: I2S data corruption?

For these tests the master and slave where swapped - so the sender is the master (I2S_MODE_MASTER) and the receiver is the slave. Everything else is the same as with the prior tests: Run__________# Correct___# Wrong 1st @48000______ 1009________11 2nd @44100______876________128 3rd @8000_______1010_...
by mgleason_3
Sun Oct 01, 2017 5:13 am
Forum: General Discussion
Topic: I2S data corruption?
Replies: 14
Views: 2629

Re: I2S data corruption?

Good suggestion. I don't know of a way to directly control clock speed in I2S. My understanding is that the SCK/BCLK is the sum of: sampling rate * bits of precision * # of channels, e.g: 44.1 kHz × 32 × 2 = 2.8224 MHz So, set up some tests using 32-bits, 2-channels. The "Sender" transmitted values ...
by mgleason_3
Sat Sep 30, 2017 4:24 am
Forum: General Discussion
Topic: I2S data corruption?
Replies: 14
Views: 2629

I2S data corruption?

Testing two ESP32's connected via I2S: Sender - Fills a buffer with 32-bit values. Then calls i2s_write_bytes to send the buffer over and over. Receiver - calls i2s_read_bytes to receive the data into buffers. Then prints the values it received. For the initial test, the sender's buffer was filled w...
by mgleason_3
Fri Sep 29, 2017 10:20 pm
Forum: Report Bugs
Topic: I2S Receive bug causing garbage data?
Replies: 12
Views: 2287

Re: I2S Receive bug causing garbage data?

Possibly, but it seems more bit-level - like bits are shifted and possibly repeated.
by mgleason_3
Fri Sep 29, 2017 10:05 pm
Forum: Report Bugs
Topic: I2S Receive bug causing garbage data?
Replies: 12
Views: 2287

Re: I2S Receive bug causing garbage data?

Thanks BuddyCasino! At first blush that looks like what I'm seeing - just the channels reversed. So, either a) there's some sort of bug/problem in HW or b) there's a problem in the code and/or my understanding. I suspect it's a)... Unfortunately, I think the bigger problem is this forum - "Discussio...
by mgleason_3
Wed Sep 27, 2017 12:39 am
Forum: General Discussion
Topic: Espressif Response to BlueBorne Vulnerability?
Replies: 7
Views: 1723

Re: Espressif Response to BlueBorne Vulnerability?

Out of curiosity, what are you using in instead?

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