Hello all, is there a reason why the clock divisor in the baudrate generator register (us->US_BRGR) is set to a fixed value in serial_setbrg(void):
us->US_BRGR = CFG_AT91C_BRGR_DIVISOR
I changed the implementation of serial_setbrg(void) and i can now opperate at higher baudrates. (change baudrate with loadb).
Here is my version:
void serial_setbrg (void) { DECLARE_GLOBAL_DATA_PTR; int baudrate, baudRateGenDiv,i; unsigned long baudrate_table[] = CFG_BAUDRATE_TABLE; int n_baudrates = (sizeof(baudrate_table) / sizeof(baudrate_table[0]));
baudrate = gd->baudrate;
//check if value is supported for (i=0; i<n_baudrates; ++i) { if (baudrate == baudrate_table[i]) { baudRateGenDiv = AT91C_MASTER_CLOCK / baudrate / 16; //printf ("## Switched baudrate to %dbps.\n", baudrate); break; } }
if (baudRateGenDiv==0) { //using default value baudRateGenDiv = CFG_AT91C_BRGR_DIVISOR; printf ("## Baudrate %dbps not supported using default baudrate %dbps.\n", baudrate, CONFIG_BAUDRATE); }
us->US_BRGR = baudRateGenDiv; }
If you agree with my changes i can provide a patch.
wbr
Peter