Re: [ts-7000] TS-7KV PLD Registers - simple code seg faults - ne suggestions

["Don W. Carr" <>]

You need to check the mmap function for errors. There is a special value (MAP_FAILED) to check for error. The start must be on a page boundry, and the size must be a multiple of the page size. Use getpagesize().

  page_start = (unsigned char *) mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd,   0x72000000);
  if (MAP_FAILED == page_start)
  {
    perror("mmap");
    exit(0);
  }

Also check the return value of open(). Less than zero means it failed.

On 8/23/06, mattsaintdev <> wrote:

Hi all,

Spotted the rewrite of the Getting Started with the TS-7KV manual and
must say its much clearer now - thanks.

Wrote the following test program to learn how to read the PLD regs,
but the only output is the first two printf lines. As soon as the
code accesses the PLD_REGS i get a segfault.

Ne suggestions?

Matt

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

volatile unsigned char *pld_regs;

int main(int argc, char **argv)
{

char base7;
int mem_handle=open("/dev/mem", O_RDWR | O_SYNC);
//
// 0x11E0_0000 = PLD Register base address
pld_regs=(unsigned char *)mmap(0, 0xFF , PROT_READ|PROT_WRITE,
MAP_SHARED, mem_handle, 0x11E00000);
//
//
//
printf("TS-7KV Register settings probe \n");
printf("------------------------------ \n\n");
printf("BASE+0 Board ID #1 = %X (documented as 0x41)\n", pld_regs
[0xE0] );
printf("BASE+1 Board ID #2 = %X (documented as 0x20)\n", pld_regs
[0xE1] );

base7=pld_regs[0xE7];
if (base7 & 0x80) printf("ADC option is installed\n");
if (base7 & 0x40) printf("CAN option is installed\n");
if (base7 & 0x20) printf("J5 Set\n");
if (base7 & 0x10) printf("J4 Set\n");
if (base7 & 0x08) printf("J3 Set\n");
if (base7 & 0x04) printf("J2 Set\n");
if (base7 & 0x02) printf("J1 Set\n");
//
//
return 0;
}

-- 
Dr. Don W. Carr
J. G. Montenegro 2258
Guadalajara, Mexico
+52-333-630-0704
+52-333-836-4500 ext 2930

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