Audiophonics.fr has wonderful pricey DIY-things, like cheap DC-DC Converter Module 3.3-13V to +/-15V by example but also a lot of DIY-Hifi-equipment..found it originally by their ES9028Q2M Audiophonics-made „Audiophonics I-Sabre ES9028Q2M TXCO„-HAT..
can be also expensive, u have to look exactly, but as said also relatively pricey things and they resident in the EU->means shorter shipping-times (for me)..
HDMI I2S LVDS to I2S Input Module HDMI I2S LVDS to I2S Output->24,90€->https://www.audiophonics.fr/en/diy-interfaces/hdmi-i2s-lvds-to-i2s-input-module-hdmi-i2s-lvds-to-i2s-output-p-12422.html
found by chance this XMOS USB-interface board; is well known->https://kitsunehifi.com/product/singxer-q1-digital-interface-board-xu208
54€ at Ebay..->LINK
so far so good, looks like normal XMOS-USB-bridges..
but interesting are the schematics to it and finally some (perhaps) information about the FS0, FS1, FS2, Mute and DSD_ON-pins..(they are nearly on every XMOS-USB-board)..
I2S socket Output Signal Description:
1 , the MUTE is high mute; DSD_ON is high DSD data stream;
2 , all the electricity an average of LVCMOS, voltage of 3.3V ;
3 , 3.3+ output power, low output current 50mA;
4 , the MCLK output 22.5792Mhz or 24.576Mhz clock;
5 , FS0, FS1, FS2 sampling rate indicator level, FS3 not;
so, the question is, are they frequency-„switches“ or, what they´ve written, „sampling rate indicator(s)“..
(but beware,they also say:“Please note, schematics and firmware (XMOS) are our own development, not the public version“)
don´t know at present, but if they are „sampling rate indicators“ you can connect some LEDs (or similar) to them and then you have your desired „sample rate indicator“ and can display it via a tftlcd or something..(but still unclear about it here; will post here any other info)
all in regard of my planned DIY-DAC (see some posts before and therefore the website is all about 😉 ), cause this TFT-LCD should show the input-source (USB,Coax,Opt.), sampling frequency, filter settings (FIRs), Volume (db) and so on..
okay, there was no information on the sellers-site about the chipset in it (and i need the info for the different Arduino+Raspberry GFX-libraries) i had to google a lot and will now show the „results“:
First, in this special TFT is an „ILI9341„; read out on a RPI3B with „fbtft_device“->
second, problem now was, because there were absolute no documentation about the pin-layout on the backside, how to wire it for SPI ?
so, a lot of googling again and here are the results Part II.:
so, my final wiring is now:
3,3V (5V is not working) Pin5 from the 6pin header at the bottom->to RPI Pin1 (Power)
GND Pin2 from the 6pin header->RPI Pin9
MOSI to MOSI !! means „SD_in“ on the first picture -> RPI pin19
MISO to MISO means „SD_Out“ ->RPI pin21
CS to „SD_CS“ ->RPI pin24 !! (CE0) ((not pin26)->CE1)
and SCLK to „SD_SCK“ ->RPI pin23..
(unfortunately i have only a light screen here now, but i guess it has something to do with the software; i will make here an update if necessary)..
(just as info for other user with similar problems)..
good tuturial: SPI on a raspberry pi->https://www.xgadget.de/anleitung/2-2-spi-display-ili9341-am-raspberry-betreiben/
after i looked about some cheap SPDIF (Coax+opt) to I2S converter, i came across these 2 birds:
AK4113: (10$ at Ebay & Aliexpress)and CS8416: (12$ at Ebay & Aliexpress)
they are both capable of max 192khz input and u can select the input-port via the „BUT“-port switch..
The LCD-display should show the Input-Line and the sample-frequency..
and because there were no wiring diagram on the sellers-site i searched a bit/lot and found some wiring-diagrams for these 2 on audiophonics.fr..
(just in case there were also google-user who are interested in such a diagram)
because here is so much feedback/and website-views on this ES9028Q2M i thought i write something about it again..
after thinking about programming this STM 8S103F3 MCU on the board (and see some Arduino IDE tuturials to become a LED blinking par example->https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino—v32/experiment-1-blinking-an-led , super nice a MUST to watch !! 😉 ) and examining the layout i see that there are also these „Vol+“,“Vol-„, „Delay“ (means filter-settings (FIRs) i think) and the „DSD“ + „PCM“ holes for Diodes/LEDs..
to make this LEDs „shine“ 😉
also with such Buttons (here i had measurements about 1cm*0,7cm (100mm*70mm)) it must be possible to have a HW-Volume and Filter-Control..
but u have to solder it right 😉 ..
another possibility would also be to solder some 4 Male 2.54mm Pin Header on it, and connect it then to a STM32F103C8T6 by example to control it via this (and with a bluetooth-receiver-transmitter and bluetooth-app par example..)
still thinking about; greets for the moment 😉