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write a 64K xmodem file to a 24c512 using i2c on a PIC16F690

 
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antiwingates



Joined: 31 May 2010
Posts: 5

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write a 64K xmodem file to a 24c512 using i2c on a PIC16F690
PostPosted: Thu Dec 09, 2010 11:13 am     Reply with quote
Hi folks.
I am not able to do a full write of a 64KB .bin file of a 24c512 i2c eeprom using a XMODEM 128 protocol.

Write work fine until 0x2000h (8192bytes) address, the pic hang-up.
If i comment the 4 lines with write_ext_eeprom the file is received fine, but of course isn't write.

here is the code:

Code:
void receive(void)
{
  byte c=0,a=0;

  if(rxchar<3)//SOH + BLOQ + C-1
       buffer1[rxchar]=getc();
  if ((rxchar>=3) && (rxchar<35))
       buffer2[rxchar-3]=getc();
  if ((rxchar>=35) && (rxchar<67))
       buffer3[rxchar-35]=getc();
  if ((rxchar>=67) && (rxchar<99))
       buffer4[rxchar-67]=getc();
  if ((rxchar>=99) && (rxchar<131))
       buffer5[rxchar-99]=getc();
  if (rxchar==131)
      chk=getc();
  rxchar++;       
  switch (buffer1[0]) { 
            case SOH:
                 if (rxchar>131) // we have whole frame
                 {
                    c=~buffer1[1];
                    if (buffer1[2]==c) //checksum of no.frame correct
                    {
                      for (c=0;c<32;c++)
                      {                              a+=buffer2[c];
                        a+=buffer3[c];
                        a+=buffer4[c];
                        a+=buffer5[c];
                      }
               
                      if(a==chk)   //Checksum data correct
                      {
                         for (c=0;c<32;c++)
                         {
               write_ext_eeprom(page+c, buffer2[c]);
                            write_ext_eeprom(page+c+32, buffer3[c]);
                            write_ext_eeprom(page+c+64, buffer4[c]);
                            write_ext_eeprom(page+c+96, buffer5[c]);
                          }
            page+=128; //pages of buffers
                         rxchar=0;  //Number of bytes of the frame
                         putc(ACK);
                      }
                      else
                 {   
                         putc(NAK); //retransmit frame chksum error
                     }               

                    }//chk.frame correct
                    else
                       putc(NAK);  //retransmit frame header error
                 }
                 break;   
            case EOT:
               putc(ACK);
               rx=0;
               break;
            case CAN:
               putc(ACK);
               break;
            }
}


any idea???
temtronic



Joined: 01 Jul 2010
Posts: 9229
Location: Greensville,Ontario

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PostPosted: Thu Dec 09, 2010 1:11 pm     Reply with quote
Since you say that it works 'fine' for the first 8KB then ...

Off the top of my head, I'd say the function write_ext_eeprom is limited to 8KB, perhaps a 'page' worth of data.

Would have to look at it in detail to see though.
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