Teensy 4 multi-pin TDM

Thank you to give some order to this code,because those amps are hard to setup for the newbie i am,
concretely,the result is the same,i'm talking about the tdmB1+2 stuff because the tdm1+2 always worked alright.
Let's say,if if set the amps 10+11 from input1,the bad sound begin after (0.1f),if i stay at (0.1f) i can't hear any of the input,that's weird
and those settings does'nt do any troubles with the tdm1+2,strange.
The amp16 that lead the sine in tdmB was not at (0.5f) in your code,so there was no sound,so i corrected.
I don't think the display is involved in the troubles for now,i will try with another cs42448 to see...:unsure:
I want also to be sure about the teensy 4.1 pins,as shown at the pjrc site:

Teensy 4.1 pinout.jpg


Pin6 (the input of tdmB) is labelled OUT1D,isn't it weird?
Pin38 is IN1,the same as Pin8,i'm confused,please tell me what really is...
 
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Well,in dispite of these questions on teensy 4.1 pins,i'm glad to tell you i've solved all my problems,
it was because i just downloaded your fork just before you updated it,but i had the intuition that something was missing in the
library,teeling me you didn't have the same library update as I.
:cool:(y)
 
Glad you’ve got it working. Yes, that’s the trouble with trying out some of these bleeding edge libraries, an essential update appears and you don’t know about it…

On the pin names, it is a bit confusing. SAI1 has 5 pins, which Paul has labelled OUT1A, OUT1B, OUT1C, OUT1D and IN1. OUT1A and IN1 are fixed direction pins, but the others could also be named IN1D, IN1C and IN1B - note the reverse order of the letters. So when you connect OUT1D as an input, it’s really IN1B.

On pin 38 being marked as IN1, note that the text is grey, which means it’s possible to re-map it for that use, if for example you wanted to use TX2. I’ve never needed to, so I’d have to Google how if I did :)
 
Thanks for these precisions,i think i will transform a teensy 4.1 picture with all the new infos,help for me to have
an understanding vision of TDM & Co.
i suppose the audio editor haven't yet a united version that include multi TDM and USB multi channel
to wire them together or am i wrong?
 
There wasn't (apart from one I made which has a bunch of other stuff in development) ... but there is now. I think this just works if you unzip and drop it into the gui folder alongside the existing index.html, which makes it easy to switch back and forth.
 

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h4yn0nnym0u5e said:
Some images of my test system in action. A pair of CS42448 PCBAs stacked up and wired to a Teensy 4.1:
View attachment 35393

Modifications made to each board. The one underneath; note
  • zero-ohm link fitted to R20 to route 3.3V to IC1
  • I²C pull-ups fitted at IC1 pins 3 and 7, pulled up to pin 2
  • AD0/1 wired on IC1 pins 8 and 1, to GND at pin 4
  • poor view of clock wiring - see next image!
View attachment 35394

The one on top. Similar mods but:
  • You can see the wiring to route LRCLK and BCLK to the ADC and DAC together
  • No pull-ups, those are on the other board
  • AD1 is wired to 3.3V, so the address is 0x4A
View attachment 35395

Test topology:
View attachment 35396

Scope output. Yellow trace is from wav10 (TDMB_O port 14), magenta is wav6 (TDMA_O port 10) wired externally to TDMA_I port 10, and measured at TDMB_O port 10.

View attachment 35397
Click to expand...
Hello! sorry for the too beginner question, I am connecting one CS42448 board and teensy 4.1 according to here, but the configuration is always failed, should I add pull-up circuit as you did? I checked my wiring several times and it should be all correct.
 

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