analysis of volume fix adapter from ebay by tomsad

so friend has problem with volume on his audi concert, I know what is problem, and also that there are at least 2 adapters on ebay which should fix this [1], [2] (second one is also here: [3])

second one is smaller and cheaper so I go for this one.

.... adapter arrived at postbox, so I was curious how it's works. So i take closer look at traces on PCB and realize that mcu is STM32, and is only grabbing SPI from display and send I2C to audio controller (TDA7342), so they recreate complete audio control stack, nice, lets check it how well it works ;).

 I made simple arduino sketch to get i2c data on this radio [4], and here are my observations:

input selector is not working,

changing bass/treble/fade/balance can by set different from what is showed on display, check my github for output from arduino i2c sniffer links to files [5],[6],[7] are from "modul from ebay/programatory.com" and file in link [8] is output of reprogrammed Motorola MCU which I buy like 3-4years back.

so, what to do? return it and try first one(from ebay) or implemented volume rewrite in my code??

so after while I write few lines of code to fix this, code is on my github [9]
schematics will be there in few days

[1] https://www.ebay.com/itm/152875338212

[2] https://www.ebay.com/itm/142651501685

[3] https://www.programatory.com/index.php?p1106

[4] https://github.com/tomaskovacik/arduino/tree/master/audi_volume_fix

[5] https://github.com/tomaskovacik/arduino/blob/master/audi_volume_fix/fix_module_by_tomcad.txt

[6] https://github.com/tomaskovacik/arduino/blob/master/audi_volume_fix/fix_module_by_tomcad2.txt

[7] https://github.com/tomaskovacik/arduino/blob/master/audi_volume_fix/fix_module_by_tomcad3.txt

[8] https://github.com/tomaskovacik/arduino/blob/master/audi_volume_fix/newchip.txt

[9]  https://github.com/tomaskovacik/audi_concert1_chorus1_volume_fix

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BK8000L change name

- unsolder flash chip on module(in my case it was FT25H04 by Fremont Micro Devices, datasheet: [1])
- connect it to programmer supported by flashrom [2]
- download flashrom source code [3]*
- extract, compile
- download flash content, or download dump from my github repository [4]

./flashrom --programmer serprog:dev=/dev/ttyUSB0 --read BK8000L.flash

edit with favorite hex editor:

search for asci string BK8000L, change it, save and flash:

./flashrom --programmer serprog:dev=/dev/ttyUSB0 --read BK8000L.flash

flashrom v0.9.9-r1955 on Linux 4.4.10-040410-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Calibrating delay loop... OK.
serprog: Programmer name is "frser-duino"
serprog: requested mapping AT45CS1282 is incompatible: 0x1080000 bytes at 0x00000000fef80000.
Found FMD flash chip "FT25H04" (512 kB, SPI) on serprog.
===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to flashrom@flashrom.org if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.

 solder flashchip back on module, power it and enjoy ;)

UPDATE 2019

No need to desolder chip, using this CH341A adapter [this one], I succesfully read/write chip, only requiremet is reset of module to be puled to ground (Credit goes here).

output of flashrom:



nail@sid:~/src/flashrom$ sudo ./flashrom --programmer ch341a_spi --read dump11.bin
flashrom p1.0-86-gad8db8c-dirty on Linux 4.4.10-040410-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found FMD flash chip "FT25H04" (512 kB, SPI) on ch341a_spi.
===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to flashrom@flashrom.org if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Reading flash... done.
nail@sid:~/src/flashrom$ sudo ./flashrom --programmer ch341a_spi --verify dump11.bin
flashrom p1.0-86-gad8db8c-dirty on Linux 4.4.10-040410-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found FMD flash chip "FT25H04" (512 kB, SPI) on ch341a_spi.
===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to flashrom@flashrom.org if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Verifying flash... VERIFIED.
nail@sid:~/src/flashrom$ sudo ./flashrom --programmer ch341a_spi --write dump7.bin
flashrom p1.0-86-gad8db8c-dirty on Linux 4.4.10-040410-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found FMD flash chip "FT25H04" (512 kB, SPI) on ch341a_spi.
===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to flashrom@flashrom.org if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.
nail@sid:~/src/flashrom$ sudo ./flashrom --programmer ch341a_spi --write dump11.bin
flashrom p1.0-86-gad8db8c-dirty on Linux 4.4.10-040410-generic (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found FMD flash chip "FT25H04" (512 kB, SPI) on ch341a_spi.
===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to flashrom@flashrom.org if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.




*originaly I use flashrom 0.9.9 + apply my patch [5]

[1] http://famousconnections.eu/wp-content/uploads/2017/10/FT25H04.pdf
[2] https://www.flashrom.org/Supported_programmers
[3] https://github.com/tomaskovacik/flashrom
[4] https://github.com/tomaskovacik/kicad-library/raw/master/library/datasheet/F-6188_BK8000L/BK8000L.flash
[5] https://github.com/tomaskovacik/kicad-library/blob/master/library/datasheet/F-6188_BK8000L/flashrom_patch_for_FT25H04_support.patch