int to_send[],int len)
{
int i=0;

code const int A[] = {0x1E...
Get rid if the INTs, the may not harm you today, but will someday. WHENEVER char will do, use it. The '51 is an 8 bit processor

anyone seen problem like that before? maybe someone can help me?
This is typical for "clock just a tad off" are you sure that your xtal is 11.0592 ? DO CHECK, we have all been fooled by what we "knew".

Erik