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https://github.com/sdima1357/stm32f401ccaudionative
stm32 black pill usb sound card
https://github.com/sdima1357/stm32f401ccaudionative
audio delta-sigma i2s-audio magic-eye pcm5102 pdm pwm retro sound-processing spdif spdif-audio stm32 stm32f4 stm32f401ccu6 usb-audio usb-devices
Last synced: about 2 months ago
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stm32 black pill usb sound card
- Host: GitHub
- URL: https://github.com/sdima1357/stm32f401ccaudionative
- Owner: sdima1357
- License: agpl-3.0
- Created: 2022-04-09T10:40:49.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2023-11-12T19:46:40.000Z (about 1 year ago)
- Last Synced: 2023-11-12T20:31:27.472Z (about 1 year ago)
- Topics: audio, delta-sigma, i2s-audio, magic-eye, pcm5102, pdm, pwm, retro, sound-processing, spdif, spdif-audio, stm32, stm32f4, stm32f401ccu6, usb-audio, usb-devices
- Language: C
- Homepage:
- Size: 2.22 MB
- Stars: 43
- Watchers: 6
- Forks: 7
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# stm32f401ccAudioNative
stm32 black pill usb sound card
last one:
https://www.youtube.com/watch?v=0MmWp3HdV2A
https://www.youtube.com/watch?v=GbiTxVYopDI
https://www.youtube.com/watch?v=TnEBuS5ONsY
High quality, low noise DAC based on 2 PWM timer channels with virtual software Sigma Delta ADC between stream from usb and PWM output.
There is implemented "sigma-delta floating point encoder" workaround of native stm32f401 limit 10.5 bits on 44100 Hz (1904 levels=84MHz/44.1KHz )
So, we can have for only $3 ,very low noise , high sound quality solution, which better then most onboard sound cards !
There is implemented virtual software second order sigma delta adc for the shift quantization noise to high frequency.
see here (it [provide useful links too at the end of document):
https://www.analog.com/media/en/training-seminars/tutorials/MT-022.pdf
But instead one bit ( two levels ) i use more bits (0-MAX_LEVELS) Same technology can be used for esp32 high quality sound rendering.
14.04.2022 :
Added second order sigma-delta
number of LCD from zero to 2
minor bugs fixed
optional external i2s module
21.04.2022 :
-- Change to open drain timer1 PWM outputs( PA8 PA9 ) config for better noise supression.
27.04.2022
-- pll bug fix
-- up pwm freq to 384KHz - significant sound quality improvment
-- add tty output
7.06.2022
-- Merge with cdu6 (spdif,pll,int,lcds)
-- add binary(2 lcd & i2s by default) & makefile into Release
-- add ref stm s*1357
