Re: [avrdude-dev] AVRDUDE and AT17LV

[Rudolf Matousek]

Hi,

well, I tried to create the programmer cable (no tries yet):

programmer
   id = "stk94";
   desc = "Download cable for ATSTK94 starter kit.";
   type = par;
   sck = 9;
   mosi = 2;
   miso = 10;
;

Now I'm trying to write the part specification. The device is memory 
only. I.e. I expect a part specification containing something like:

part
   id = "at17";
   desc = "Serial boot EEPROM for FPGA devices.";
   memory eeprom
       paged = yes;
       size = 131072;
       page_size = 128;
       min_write_delay = 4000;
       max_write_delay = 4500;
       readback_p1 = 0xff;
       readback_p2 = 0xff;
   ;
;

Well, and now I don't really know what else. The memory is using I2C 
interface. I.e. each block write starts with a start bit, then it 
continues by writing a sequence of bytes and it is finished by a stop 
bit. Each write operation must be acknowledged by a low value on data 
signal. The byte sequence is cmd, addr1, addr2, addr3, data1, ..., dataN.

I really don't know how to map this sequence onto the 32bit instruction 
format. How works data and clk together? How is the 32bit instruction 
mapped onto the programer interface? Is there a more detailed 
documentation what the writepage and the other instruction do?

Cheers,

rookie Ruda M.

--

E. Weddington wrote:

> On 6 Sep 2004 at 16:31, Rudolf Matousek wrote:
>
>  
>
> > Eric,
> >
> > I'll try, but first I must find a cable that is compatible with anything 
> > available in avrdude. Is there a chance to get schematic of supported 
> > cables or something like this?
> >
> > I've got a very simple paralel cable:
> >
> > pin 2 -> data (put it low, otherwise pulled high)
> > pin 9 -> clock
> > pin 10 <- data
> >
> > Don't you recognize it as one of the supported cables?
> >
> >    
>
> Again, go read the avrdude user manual.
>
> You can specify which pins do which function in the config file.
>
> Eric
>