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Subject: AW: More port pins revealed
From: edx (Felix.Arends_at_gmx.de)
Date: 2002-01-06


Hehe great! I have been experimenting with the input pins as well (but I
didn't get any useful result). I'm getting more and more angry about my
damaged JukeBox (want to try all this).

> PA15: USB cable connected

I thought the firmware from the ROM would manage the USB connection to
the computer. Does that mean that it would theoretically be possible to
develop another format for transmitting the hd-content? I have also
noticed that the USB connection is not activated if one of our
"hack-OSs" is running while the cable is plugged in. Maybe the original
firmware shuts down if a USB cable gets connected to establish the
connection to the computer?

/edx (Felix Arends)

----- Original Message -----

 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



Page was last modified "Jan 10 2012" The Rockbox Crew
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