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Now with working lcd code (at least for me ;) I have been able to find which
port pins the keys are connected to:

ON: PA5
MENU: PC1
PLAY: PC4
STOP: PA11
NEXT: PC3
PREV: PC0

Other interesting pins:

PA14: goes low on every key press except ON
PA15: USB cable connected
PA0: DC adapter connected

Note: All of the above are active low.

Idle values for the ports are:

Port A: FF7F
Port B: 7BEB
Port C: 7AFF (note: upper 8 bits of register PCDR are undefined)

The code used for this experiment:

-----
void hex16( unsigned char* buf, unsigned short value )
{
   static char* hexcode = "0123456789ABCDEF";
   buf[0] = hexcode[(value & 0xf000) >> 12];
   buf[1] = hexcode[(value & 0x0f00) >> 8];
   buf[2] = hexcode[(value & 0x00f0) >> 4];
   buf[3] = hexcode[value & 0x000f];
   buf[4] = 0;
}

int main(void)
{
   char buf[5];
   int i;
   /* clear screen */
   lcd_printxy(0,0," ",11);
   lcd_printxy(0,1," ",11);
   while (1) {
      hex16(buf,PADR);
      lcd_printxy(0,0,buf,4);
      hex16(buf,PBDR);
      lcd_printxy(6,0,buf,4);
      hex16(buf,PCDR);
      lcd_printxy(0,1,buf,4);

      PBDR ^= 0x40; /* toggle LED (PB6) */

      for ( i=0; i<1000000; i++ );
   }
}
-----

/Björn

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