Problem with copying hex data

[hospodar]

Posted on October 28, 2015 at 13:28

Hello,

I have following problem with copying hex data.

for

(i = 0; i < 6; i++) {
printf

(

''%02x''

, packet[i]);

// copy packet to FIFO

}

Printf copy data from packet[] to FIFO. Everything is ok if copying data like these on first screenshot bellow (0xAA,0xBB,0xCC,0xDD). But if copiyng different values (but with some data type - 0x01, 0x03, 0x00, 0x05) things going wrong. In the destination FIFO is 0x30, 0x30, 0x00, 0x00,... which is bad.

https://www.dropbox.com/s/oib1gsgpdvs8ttk/OK.PNG?dl=0

https://www.dropbox.com/s/rhgh6orot3ypswh/NOK.PNG?dl=0

It is weird for me. Where can be a problem? Thank you.

[Tesla DeLorean]

Posted on October 28, 2015 at 14:16

The protocol is not very robust to character loss, might want a space, or synchronization byte to that the digits don't slip.

If there is an issue over the wire, look at the bit timings, and intersymbol spacing (ie increase stop bits)

[hospodar]

Posted on October 28, 2015 at 21:13