[ts-7000] TS-7390 - Sample program button.c not working for me

["happy_plattler" <>]

Hi everyone,

I am trying to get the sample program from the files section to work on the 
TS-7390 (see code at the end). But it is not working as expected.

I get it compiled, not a problem. When I comment out the while loop I get the 
LED flashing so that part is working.

So I must be wrong with the physical button part. Looking at the documentation 
of the TS-7370 preliminary manual page 3 I assume that they are talking about 
PIN 17 on the 40 PIN JTAG/DIO header as DIO pin 1 and PIN 18 would be DIO pin 2 
(ground). I am assuming shortcutting those two pins equals a push of a button. 
Now if I do this and release it nothing happens. Well I thought perhaps they 
mean DIO pin 5 (or DIO_00) as first DIO input pin but nothing is happening here 
either.

Any suggestions where I am heading the wrong way?

Thanks a lot,

Ole



// filename button.c
// connect a button to DIO pin 1 and ground
// blinks green and red led on the ts-7200 when button is pressed
//
// compile arm-linux-gcc -o button button.c
//

#include<unistd.h>
#include<sys/types.h>
#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<string.h>

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


   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

   PEDR = (unsigned int *)(start + 0x20);     // port e data

   PEDDR = (unsigned int *)(start + 0x24);    // port e direction register
   GPIOBDB = (unsigned int *)(start + 0xC4);  // debounce on port b

   *PBDDR = 0xf0;                             // upper nibble output, lower 
nibble input
   *PEDDR = 0xff;                             // all output (just 2 bits)
   *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++) {
      *PEDR = 0xff;
      sleep(1);
      *PEDR = 0x00;
      sleep(1);
   }
   close(fd);
   return 0;
}





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