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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 |
Posted: Thu Dec 09, 2010 11:13 am |
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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;
}
}
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any idea??? |
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temtronic
Joined: 01 Jul 2010 Posts: 9173 Location: Greensville,Ontario
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Posted: Thu Dec 09, 2010 1:11 pm |
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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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