okay, bought some STM32F103C8T6 („Blue Pill“) of about 1,55€ (1,72$) !! at Aliexpress->Link thought i could use it for my planned own DIY-DAC to display input-source, samplerate, filter-settings, volume etc..
also a 2.6 “ TFT (240X320)->Link (Youtube-Vid is with an 0.96 OLED)
you can program/flash it with a Raspberry Pi->Link, no need for a usb-ttl adapter or ST-Link or something..
so, and with this Arduino IDE u can write some little programms/“sketches“ and write/upload them directly to the chip.. now i must a find a way to read out some information (from maybe a XMOS-USB-Bridge) about the samplerate for example, or maybe which input (USB (I2S), opt, coax) and write it out on a display.. but super no clue at present !! 😉 , i´ll inform you here about some progress..
okay, got here after a few updates Beta9 to work.. tried a lot, but with at present only „Generic 2 I2S-hifiberry-dac“ settings available and without the advanced or realtime-kernel i got only max 192khz over the bus..(with this ES9028Q2M) so i fiddled a lit bit around with the DSD-settings, and it was only „DoP“-possible (see pictures) (not native DSD !! afaik – but have no problem with that here) with this board + actual settings but u have to set „Sox resampling=enabled“ and „DoP=yes“..curiously with sox resampling disabled-> no DoP !! (just for info) DoP -> „yes“:
(DoP „no“->then no native DSD also->only PCM):
(rem.: it displays „DSD“ anyway->its related to the file (extension))
(Update: Moode V4 Beta9 as 2.6GB compressed to 920MB image here->Link (Google-Drive))