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#define _BSD_SOURCE
#define _POSIX_C_SOURCE 199309L
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <time.h>
#include <sched.h>
#include <sys/time.h>
#include "pcilib.h"
#include "irq.h"
#include "kmem.h"
#define DEVICE "/dev/fpga0"
//#define REALTIME
#define BAR PCILIB_BAR0
#define BITS 32
#define MASK ((1ll << BITS) - 1)
#define WR(addr, value) { *(uint32_t*)(bar + addr) = value; }
#define RD(addr, value) { value = *(uint32_t*)(bar + addr); }
unsigned long long bits[BITS];
int main(int argc, char *argv[]) {
uint32_t i, j;
pcilib_t *pci;
uint32_t reg, value, diff, errors;
void* volatile bar;
unsigned long long attempts = 0, failures = 0;
if (argc < 2) {
printf("Usage: %s <register>\n", argv[0]);
exit(0);
}
if (sscanf(argv[1], "%x", ®) != 1) {
printf("Can't parse register %s\n", argv[1]);
exit(1);
}
#ifdef REALTIME
pid_t pid;
struct sched_param sched = {0};
pid = getpid();
sched.sched_priority = sched_get_priority_min(SCHED_FIFO);
if (sched_setscheduler(pid, SCHED_FIFO, &sched))
printf("Warning: not able to get real-time priority\n");
#endif /* REALTIME */
pci = pcilib_open(DEVICE, PCILIB_MODEL_DETECT);
if (!pci) {
printf("pcilib_open\n");
exit(1);
}
bar = pcilib_map_bar(pci, BAR);
if (!bar) {
pcilib_close(pci);
printf("map bar\n");
exit(1);
}
for (i = 0; 1; i++) {
WR(reg, (i%MASK));
RD(reg, value);
attempts++;
if (value != (i%MASK)) {
failures++;
diff = value ^ (i%MASK);
for (errors = 0, j = 0; j < BITS; j++)
if (diff&(1<<j)) errors++;
bits[errors]++;
//printf("written: %x, read: %x\n", i, value);
}
if ((i % 1048576 ) == 0) {
printf("Attempts %llu, failures %llu (", attempts, failures);
for (j = 1; j < BITS; j++)
printf("%llu ", bits[j]);
printf(")\n");
}
}
pcilib_unmap_bar(pci, BAR, bar);
pcilib_close(pci);
}
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