Dear all,
I've been trying to access the VME-bus using a Xembedded XVME-6300 board
(with TSI-148 chipset) and the vme_user module from Martyn, with success.
(Thanks to Martyn for an easy demo program).
I've modified the code (see below) to...
- use A_32/D_32
- use 0x8BB00000 as base address
- read data at an offset 0x8400 from this address
- do a read of 6400 bytes instead of 512 bytes
This seems to be working perfect (another VME-card writes a recognizable
pattern at the above address, and I can see it using the printf-statements).
HOWEVER:
When I do this read in a loop (eg. 100 times),
then my whole system freezes/hangs after about 50 times,
and I have to power off/power on the machine...
Does anybody have an idea what's going wrong ?
Can I activate something to find out the problem ?
Kind regards,
Steven De Roo
--------------------------------------------------------------------------------
#define _XOPEN_SOURCE 500
#define u32 unsigned int // Needed to add this line
#include <linux/types.h> // Needed to add this line
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "vme_user.h"
int main(int argc, char *argv[])
{
int fd;
int i;
int retval;
unsigned char data[6400];
struct vme_master master;
fd = open("/dev/bus/vme/m0", O_RDONLY);
if (fd == -1) {
perror("ERROR: Opening window device file");
return 1;
}
master.enable = 1;
master.vme_addr = 0x8BB00000;
master.size = 0x10000;
master.aspace = 4; // VME_A32
master.cycle = 0x2000 | 0x8000; // user/data access
master.dwidth = 4; // VME_D32
retval = ioctl(fd, VME_SET_MASTER, &master);
if (retval != 0) {
printf("retval=%d\n", retval);
perror("ERROR: Failed to configure window");
return 1;
}
for (i=0; i<sizeof(data); i++) {
data[i] = 0;
}
for (loop=0; loop<100; loop++)
{
retval = pread(fd, data, sizeof(data), 0x8400);
if (retval < sizeof(data)) {
printf("WARNING: Only read %d bytes", retval);
}
// Print first 64 bytes
for(i=0; i<8*8; i++) {
if (i % 8 == 0) {
printf("\n""%4.4x: ", i);
}
printf("%2.2x ", data[i]);
}
printf("\n");
}
close(fd);
return 0;
}
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