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headphones/firmware/tools
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George Norton 41d4023961
Run the DAC in 24bit mode. (#25) 
* Run the DAC in 24bit mode.

* Update comment.

* Remove accidental paste

* Fix distortion.

* Shift up the samples into -1..1, not much different, but we get an extra bit of resolution at the low end.
 		2023-09-14 04:49:56 -04:00
..
CMakeLists.txt Run the DAC in 24bit mode. (#25) 2023-09-14 04:49:56 -04:00
README.md Run the DAC in 24bit mode. (#25) 2023-09-14 04:49:56 -04:00
filter_test.c Run the DAC in 24bit mode. (#25) 2023-09-14 04:49:56 -04:00
reboot_bootloader.py Basic support for rebooting into the bootloader. (#10) 2023-04-13 09:08:59 -04:00

README.md

filter_test

This is a basic utility for testing the Ploopy headphones filtering routines on a PC.

Usage

Find a source file and use ffmpeg to convert it to 16bit stereo PCM samples:

ffmpeg -i <input file> -vn -f s16le -acodec pcm_s16le input.pcm

Run filter_test to process the PCM samples. The filter_test program takes two arguments an input file and an output file:

./filter_test input.pcm output.pcm

You can listen to the PCM files using ffplay (which is usually included with ffmpeg):

ffplay -f s24le -ar 48000 -ac 2 output.pcm

If there are no obvious problems, go ahead and flash your firmware.

reboot_bootloader.py

If your Ploopy Headphones firmware is new enough, it has support for a USB vendor command that will cause the RP2040 to reboot into the bootloader. This will enable you to update the firmware without having to remove the case and short the pins on the board.

Usage

Connect the Ploopy headphones DAC and run:

./reboot_bootloader.py

You will need python3 and the pyusb module. If you get a permission denied error you may need to configure your udev rules, or run the script with administrator privileges.