[ts-7000] DIO output TS-7260

["Rekcut_Nod" <>]

I'm attempting to run the TS sample from:

ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7260-linux/samples/button.c

modified slightly to toggle output on the DIO1 header, rather than the on-board 
LEDs.  I'm monitoring DIO1 pin 9 (DIO_4) with a volt meter across a resister to 
ground, and it reads a constant 5.6mV, even when the program enters into the 
toggle loop.

Can anyone tell me what I need to do differently?

Don


int main(int argc, char **argv)
{
   volatile unsigned int *PBDR, *PBDDR, *GPIOBDB;
   int i;
   unsigned char state;
   unsigned char *start;
   int fd = open("/dev/mem", O_RDWR|O_SYNC);

   start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 
0x80840000);
   PBDR = (unsigned int *)(start + 0x04);     // port b
   PBDDR = (unsigned int *)(start + 0x14);    // port b direction register
   GPIOBDB = (unsigned int *)(start + 0xC4);  // debounce on port b

   *PBDDR = 0xf0;                             // upper nibble output, lower 
nibble input
   *GPIOBDB = 0x01;                           // enable debounce on bit 0
   
   state = *PBDR;                             // read initial state
   while (state & 0x01) {                     // wait until button goes low
      state = *PBDR;                          // remember bit 0 is pulled up 
with 4.7k ohm
   }
   

   // blink 5 times, sleep 1 second so it's visible
   for (i = 0; i < 5; i++) {
      *PBDR = 0xf0;
      sleep(1);
      *PBDR = 0x00;
      sleep(1);
   }
   close(fd);
   return 0;
}



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