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b616047311
The frame-scheduling logic cherry picked from the 'rockpod'
fork [1] was not correct for high-speed hosts and broke USB
Audio output.
The DWC seems to schedule based on the DWC_DSTS.SOFFN field,
which is a 14-bit microframe number for high-speed hosts. For
full speed hosts SOFFN is the LSB-aligned 11-bit frame number.
For high-speed hosts, USB Audio and iAP use a bInterval of 4
for the ISO endpoint which means the host sends a packet every
8 microframes. Thus, we only receive data on even microframes,
which is why adding frame scheduling broke things (and why we
got away with not doing it before).
For full speed the bInterval is 1, we get a packet each frame
and we do need to tell the core to receive on odd frames.
This code is still not completely correct for arbitrary ISO
endpoints -- for that we would need the function drivers to
provide the (micro)frame number on which they want to send or
receive.
Tested by forcing full speed at the device side by setting
USB_DW_DCFG_SPEED=3. USB Audio works fine in both high and
full speed modes now.
[1]
|
||
|---|---|---|
| android | ||
| 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!