MP3Car.com - View Single Post - Renault "Tuner List" Head Unit/CD changer hacking

pippolippi · 02-11-2006, 04:08 PM

Quote: Originally Posted by Vicne

However, from frame 97 on, the alignment becomes corrupted, but it's most probably due to ACKs coming in the game when track changes are requested by the head unit, this has to be fixed manually in the dump...

It seems that the CDC replies with an acknowledgment (C5, I don't use ACK since it's ascii code 06) when it receives a command (disclaimer: I only looked at the first version of the dump without the reformatting, so I don't know if command/reply are synchronized).
Also note that 3D and 3F only differ in one bit (2), maybe the bit is used to signal something.
Can you try to capture the communication while powering up the HU and with the cd player not playing?

02-11-2006, 04:08 PM	#45
pippolippi Constant Bitrate Join Date: Feb 2006 Posts: 113	Quote: Originally Posted by Vicne However, from frame 97 on, the alignment becomes corrupted, but it's most probably due to ACKs coming in the game when track changes are requested by the head unit, this has to be fixed manually in the dump... It seems that the CDC replies with an acknowledgment (C5, I don't use ACK since it's ascii code 06) when it receives a command (disclaimer: I only looked at the first version of the dump without the reformatting, so I don't know if command/reply are synchronized). Also note that 3D and 3F only differ in one bit (2), maybe the bit is used to signal something. Can you try to capture the communication while powering up the HU and with the cd player not playing?