Renault "Tuner List" Head Unit/CD changer hacking - Controls

**Ale** · 07-17-2006, 04:46 PM

Originally Posted by lond

I can get a PIC16F628 at my local electronic store.

Can you plz compile the code fore me?

//Marcus Löfstrand

Hmm, this require some check of config register, internal clock, baudrate etc.
If you really need the hex code I can build it within some days but i cannot test it, i haven't in plan to buy the pic16f628.

**lond** · 07-17-2006, 06:45 PM

Hi
I found the right PIC at digikey.com, butt they don't deliver to Sweden

Do you know where I can by the PIC with in EU?

//Marcus Löfstrand

**nation** · 07-17-2006, 10:25 PM

Originally Posted by Ale

Check the configuration word in the winpic should be 0x30e4.
if you use the internal oscillator check if the bit time is 104uS.
adjust value of register osctune (in the main routine) to obtain the correct time.

I checked winpic and config word at address 2007: 30E4
i tested with my scope and i can see a 102-106 uS signal (i need a new scope, i can't see the exact timing with my old phillips scope

)it hasto be 104us exactly?

i used your code with internal oscillator, do i have to adjust value of register?

if you select to use internal osc,you dont have external osc parts, then why do you have to adjust the osctune? do i have to adjust the osctune with each pic processor that i want to use?
and why i cant see communications with hyperterminal? i tested to connect the pic emu to the pc and i cant see any data, i tested at 9600 8-E-1 but with the scope i can see the data

**lond** · 07-18-2006, 08:49 AM

Have placed a order of some samples from microchip, I hope they arrive son

//Marcus Löfstrand

**Ale** · 07-18-2006, 01:05 PM

Originally Posted by nation

I checked winpic and config word at address 2007: 30E4
i tested with my scope and i can see a 102-106 uS signal (i need a new scope, i can't see the exact timing with my old phillips scope

)it hasto be 104us exactly?

The tolerance admitted usually is +-1% (103-105uS). the tolerance of internal osc given in datasheet is also +-1% but at 25°C and 5.0V.

i used your code with internal oscillator, do i have to adjust value of register?

if you select to use internal osc,you dont have external osc parts, then why do you have to adjust the osctune? do i have to adjust the osctune with each pic processor that i want to use?

If the pic is at its limit tolerance should be adjusted.

and why i cant see communications with hyperterminal? i tested to connect the pic emu to the pc and i cant see any data, i tested at 9600 8-E-1 but with the scope i can see the data

If you get the signal from the collector of the transistor that go to HU-RX(14) check if the out level is 0-12V. If is ok perhaps your PC need a compliant rs232 so i suggest you for testing purpose to use a free max232 tx inverter that get the signal from pin 6 of pic and send its out to rs232 pin 3.

If you are pratice with excel VBA i can give you my program to test the PIC. It need the mscomm32.ocx that you can get by installing a simple program see the site XL_RS232

**Ale** · 07-18-2006, 01:49 PM

Originally Posted by nation

do i have to adjust the osctune with each pic processor that i want to use?

I think a litlle about this problem and It should be that my PIC is out of tolerance, so it is better to start with osctune = 0;

then there is way to test the frequency without the oscilloscope:

the routine the send the "play" frame every second should work exactly every ONE second so if you count 60 frame should take 1 min.

There is a small correction to do to adjust this time that in release 1.7 is wrong, i use the value 117 for next timer0 period but it should be 125.
As in the following code:

Code:

char getChar2(unsigned millisec)
{
char ch;
    char next = 0;

    tmr0 = 2;  // deduct 2*8 fixed instruction cycles delay
    do  {
        next += 117; change to 125;
        while (iwr==ird && tmr0 != next)   // 125 * 8 = 1000 (= 1 ms)
            ;
    } while (iwr==ird &&  --millisec != 0);

**busheyguy** · 07-23-2006, 08:36 AM

After a long search, I have found a solution, thanks to Dee Keenan of Armour Automotive Ltd.

It is now possible to connect your Renault Update List radio to your iPod without losing the CD changer. Autoleads are about to bring out a lead which plugs into the AUX input and connects to the bottom of your iPod so that it recharges it as well (although you actually need two parts, as the AUX lead only has a phono on the end, which you then need to connect to the iPod lead). The leads should be available through any Autoleads (part of Armour Automotive Ltd) dealer from the end of July (although you should be able to preorder them now). Their dealers are listed on their site at http://www.autoleads.co.uk

The parts will be PC7-REN-J for 3.5mm jack, and PC7-REN-P for phono connection. You also need the PC7-POD-200 and PC7-POD-L along with the Renault aux, and this would charge the IPOD and take audio all from the base of the unit, rather than from the jack port, which would refine the audio quite a bit. (I’m not sure which of these is the right part but the Autoleads dealer should be able to tell you).

I have just pre-ordered my leads.

Peter