Rockbox

Attached to Project: Rockbox
Opened by fish - 2009-09-15
Last edited by saratoga - 2009-09-16

Hi,

I open this bug to track the issue described in:

http://forums.rockbox.org/index.php?topic=10164.msg154638#msg154638

Hope this will help you and save some work, because I would love to see the new D2 Devices supported (Because imo the original UI really, really sucks).
So here we go:

=shotofadds=

Ok, I spent a couple of hours looking into this today and it looks like some new D2+ units have an entirely different power management chip, instead of the PCF50606 used by older D2+’s and the ‘classic’ D2.

Looking at firmware 4.11+ (since that is what I use on my player) it shows some interesting changes almost straight away:

- Follow the branch at 0x200000F8 (LDR PC,=0x20009BD4)
- In older firmwares, the first call in this routine starts writing to the PCF50606 almost immediately (using I2C slave address 0×10)
- In 4.11, this now tests the value of GPIOA6 (used for backlight control on older D2s) and stores a flag depending on its value
- Depending on this flag, the next routine (at 0x200722E4) either calls the PCF50606 init routine (0x200BD1C8) or another init routine (0x200BDBE8)
- The new init routine makes numerous I2C writes to slave address 0xE6, with completely different register addresses to the PCF chip.

Similarly, the backlight control routine (0×20072320) checks this flag, and calls either the PCF routine (0x200BD5C4) or a new one (0x200BE19C). To control the backlight brightness, this new routine writes registers 0×28 and 0×29 to I2C address 0xE6.

I don’t know what this new chip is - anyone fancy opening their D2+ to find out? Although having said that, this disassembly should give us enough information to get Rockbox working eventually… it’s just that I won’t be around for the next couple of weeks to look into it.

=helloworld1=

I crack open my 3-day D2+. Unfortunately I break the device’s mic somehow.
I don’t know where is the LCD controller chip. here lists most chips I can find on the main board.
PCF50635HN (Is this one different from original?)
Samsung 919 (8G)
24020A
TCC7801
Samsung 840 K4M56323P I
MAX 1779
WM89859
8117 907A
D129C

The LCD screen have some text like this: ATOUCH A025 3DE4

=shotofadds=

Well that’s (PCF50635HN) certainly different, but I can’t find a datasheet to check any details. All the references suggest it’s a smaller verison of the PCF50607, for which I can’t find any details either. I guess I’ll have to do some more investigative work when I get back from my holidays…

=helloworld1=

Also after massive searches, I also cannot find a datasheet of PCF506035 or PCF50607. Even the only datasheet of PCF50606 is from rockbox website. I will try to mail NXP semiconducts for the datasheet.

— I will try to update this task with additional infos asap. First I try to reach helloworld1 to see if he successes in getting his hands on the datasheet.