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The WM8750 frames its ADC on ADCLRC and its DAC on DACLRC. As the I2S slave both are inputs, and the rk27xx has a single LRCK, which on the YP-CP3 evidently does not reach ADCLRC: with the rk27xx as the master, the recording DMA got exact zeros on most visits to the recording screen and real samples only by chance, sometimes changing partway through a visit. That stays so with the codec PLL no longer glitching the I2S clocks (previous commit); with the codec as the master it does not happen. The codec now drives BCLK and both LRCKs itself, and the rk27xx I2S transmitter and receiver are slaves. The codec's MCLK still comes from the rk27xx codec PLL at 256 fs, so sample rates stay exact. The original firmware runs the codec as master too, but off a fixed 12 MHz in USB mode. RK27XX_I2S_MCLK says the rk27xx makes the codec's MCLK, apart from CODEC_SLAVE, which also makes it the I2S master. The YP-CP3 drops CODEC_SLAVE for RK27XX_I2S_MCLK, and the WM8750 driver sets its master bit as it does for any codec that is not a slave. Tested on a YP-CP3: playback, FM radio, the recording screen's peak meter on every visit, recording from the microphone and from FM. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Change-Id: I0dc93d3b2c45fddf61649702a931d11806e78cbf |
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| apps | ||
| backdrops | ||
| bootloader | ||
| docs | ||
| firmware | ||
| fonts | ||
| icons | ||
| lib | ||
| manual | ||
| packaging | ||
| tools | ||
| uisimulator | ||
| utils | ||
| wps | ||
| .gitattributes | ||
| .gitignore | ||
| .gitreview | ||
__________ __ ___.
Open \______ \ ____ ____ | | _\_ |__ _______ ___
Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
\/ \/ \/ \/ \/
Build Your Own Rockbox
1. Clone 'rockbox' from git (or extract a downloaded archive).
$ git clone git://git.rockbox.org/rockbox
or
$ tar xJf rockbox.tar.xz
2. Create a build directory, preferably in the same directory as the firmware/
and apps/ directories. This is where all generated files will be written.
$ cd rockbox
$ mkdir build
$ cd build
3. Make sure you have mips/m68k/arm-elf-gcc and siblings in the PATH. Make sure
that you have 'perl' in your PATH too. Your gcc cross compiler needs to be
a particular version depending on what player you are compiling for. These
can be generated using the rockboxdev.sh script in the /tools/ folder of the
source.
$ which arm-elf-eabi-gcc
$ which perl
4. In your build directory, run the 'tools/configure' script and enter what
target you want to build for and if you want a debug version or not (and a
few more questions). It'll prompt you. The debug version is for making a
gdb version out of it. It is only useful if you run gdb towards your target
Archos.
$ ../tools/configure
5. *ploink*. Now you have got a Makefile generated for you.
6. Run 'make' and soon the necessary pieces from the firmware and the apps
directories have been compiled, linked and scrambled for you.
$ make
$ make zip
7. unzip the rockbox.zip on your music player, reboot it and
*smile*.
If you want to build for more than one target, just create several build
directories and create a setup for each target:
$ mkdir build-fuzeplus
$ cd build-fuzeplus
$ ../tools/configure
$ mkdir build-xduoox3
$ cd build-xduoox3
$ ../tools/configure
Questions anyone? Ask on the mailing list or on IRC. We'll be happy to help you!