XAI source code

[lilltroll]

Version: 1.3
Status: Public release
License: Custom Licence
Download: /files/project_builds/XAI-I2S loopback_with_LCD_button_touch_framebuffer_dual_vector_stereo-resampling.zip

This project aims to post updated source code that runs on the XDK-G4-XAI code - proven to work under XDE 10.4 and with the XAI on the right side on the XDK.

Ckeck out the XAI user guide for DIP-Switches settings on the XDK at "https://www.xmos.com/published/xaiqs"

XMOS is planning to release updated code in the future - but until that date - feel free to begin with this one!
Images:

[lilltroll]

The Clock synthesizer can generate clocks up to 75 MHz.

The CODEC doesn't want frequencies above 51.2 MHz, but that's too high speed anyway for an unbuffered XMOS serial inport ( in port wck).
Up to 45 MHz seems to work during test.

Thus, 176.4 kHz fs is on the limit in master mode (MCLK=45.1284 MHz)
with a 256xFs QSM => Latency = 111 us.


Lowest possible MCLK=6 MHz => fs=11718,75 Hz @ 512xFs- SSM => Latency = 2.4 ms

[lilltroll]

With a MCLK/BLCK = 2 we can achieve fs=200 kHz with a MCLK=25.6 MHz
There is no danger to starve the XMOS out of time due to a very high MCLK.

But as the code is implemented it's not possible to run the thread in 50 MHz and fs @ 200 kHz; the process will be starved out of time. And this is only for stereo in - stereo out.
Is it really possible to run 6 channels in and 8 channels out at 192 kHz. At the moment I'm not sure at all. But using more active channels shouldn't be a headache for the I2S routine since all date is streamed in only one XMOS channel.

The latency is around 110us at 200 kHz.

[lilltroll]

Added VU meters + 6->6 channels loopback (reversed stereo chan)

[lilltroll]

Added:
Linebuffer to the LCD
Buttons & Leds
Touchscreen
Graph/data vier with 144 dB of zoom in Y-led based on touch
Channel 1&2 are sent to DSPcore(0) & DSPcore(1) where resampled 1:24, then loopbacked.
Channel 3,4,5,6 are loopbacked directly.
2 empty screens for user code (Black and Blue) buttons
Not yet tested or optimized above 44.1 kHz