[Zombie] Conversion your dead 2900XT into useful beast.

[s0lid]

"Lame in coding"
How humble of you

Nice init seq there. Tomorrow i shall zombify my HD2900Pro and send it to GPU heaven
After that Coding em C like a boss. Currently sitting in a train which i've done for about 10 hours today, 3 hours and i'll get home...

[0skill]

nice work
both

[s0lid]

Uh oh. Zombified my HD2900, haven't tested it yet but did the gnd -> 12V and Vout measurments.

GND - 12V, raises to 48kOhm then drops to 11kOhm after a while
GND - Vout, 99.1Ohm... Is this bad?

Everything has been soldered so far except the 3.3v line to U24's pin14.

E: Solved.
Remove R689, it's a 100ohm burden resistor in between Vout and GND. GND - Vout is now ~3kOhm and rising.
Something you could highlight in the how-to TiN

[RRainbo]

Originally Posted by s0lid

Is this bad?

I have same values on my 2900gt and card working without problem.

I today also tried communicate with slaves. Working OK
So if someone interested here is code:

unsigned short lock=85;
unsigned short ovride=129;
unsigned short temp=167;
unsigned short stat=163;

//WRITE MASTER
//example
wrsmbus(24,tempwr);  

void wrsmbus(unsigned short cmd,unsigned short wr){//writing
      I2C_Start();
      I2C_Wr(adr);         //device adres
      I2C_Wr(cmd);         //register
      I2C_Wr(wr);          //new value
      I2C_Stop();
}

//WRITE New voltage
//example
writesmbus(126);

void writesmbus(unsigned short tempwr){  //tempwr unsigned short
      wrsmbus(24,tempwr);     //write new value to DAC    value 0-255
      wrsmbus(29,lock);       // write enable register    lock code 01010101b
      wrsmbus(25,ovride);     //override reg  1000 0001b override enable
}

//READ Master
//example
//something=readsmbus(6);

unsigned short readsmbus(unsigned short cmd){
      I2C_Start();  //start communication
      I2C_Wr(adr);//write dev address
      I2C_Wr(cmd);//choose register to read
      I2C_Repeated_Start();
      I2C_Wr(adr+1);//select reading value
      mstat = I2C_Rd(0);//recieve 8bit value
      I2C_Stop(); //end communication
      return mstat;
}

// READ SLAVE
//example
//something=readslavesmbus(1,temp);

unsigned short readslavesmbus(unsigned short slnmbr,unsigned short comand){
      wrsmbus(8,0);   //Clear slave ID reg
      wrsmbus(7,comand); //(temp) or (status)
      slnmbr=slnmbr+128; //slave number + MSB=1
      wrsmbus(8,slnmbr);  //write slave number
      Delay_ms(10);
      read=readsmbus(10);
      return read;
}

[s0lid]

Originally Posted by RRainbo

I have same values on my 2900gt and card working without problem.

Yeah already found out the reason why it differed from the tutorial. I had R689 burden resistor in place which TiN removed when doing the turorial.

Also i forgot to buy resistors while i was at local electornics shop earlier today
Got no resistors for pull-down atm... I can get something done but can't test the code.

[s0lid]

The main pwm gives out a 1.28-1.34V voltage but memory is at 0.01V.
Also the pwm keeps little rattling noise. Some protection kicking in and switching off the memory side?

I can change the controller and slave(s) no prob, got some donators and equipment here

Used 2.7Ohm 17W resitors as dummy load. Too high resitance?

[RRainbo]

Yes it will be probably some protection. What kind you will get from Master status reg.
My card make noise too when i set higher voltage. Probably because of small(no) load i think.

2.7ohm -> cca 500mA (I=U/R)

[0skill]

i dont know what we should take as minimum load but when i tested my zombies i used a few 1ohm and 0,67 ohm resistors 20W

btw. really nice coding RRainbo

[s0lid]

I think i'll desolder the memory side of my hd2900 zombie.
I'll take new one from HD3870X2's gpu pwm hrhr. 2 phases for memory should be nice overkill

[teurorist]

wrong thread but i love your work with the arduino