Use random values for memtest

diff --git a/examples/headless/main.c b/examples/headless/main.c
index 06b4ae339fd0d7944d7658bac27cce5012909b06..426f8f822bb72b0f326416f6f9bda26f24a5a95a 100644 (file)
--- a/examples/headless/main.c
+++ b/examples/headless/main.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <string.h>
+#include <time.h>
 
 #include <fcntl.h>
 #include <errno.h>
@@ -95,7 +96,9 @@ int main(int argc, char *argv[]) {
        struct gramCtx ctx;
        int serial_port, baudrate = 0;
        uint32_t read_value, expected_value;
+       uint32_t pattern[128];
        const int kDumpWidth = 8;
+       size_t i;
 
        if (argc != 3) {
                fprintf(stderr, "Usage: %s port baudrate\n", argv[0]);
@@ -116,23 +119,28 @@ int main(int argc, char *argv[]) {
        gram_init(&ctx, (void*)0x10000000, (void*)0x00009000, (void*)0x00008000);
        printf("done\n");
 
+       srand(time(NULL));
+       for (i = 0; i < 128; i++) {
+               pattern[i] = rand();
+       }
+
        printf("memtest... \n");
-       volatile uint32_t *ddr = 0x10000000;
+       volatile uint32_t ddr_base = 0x10000000;
 
        printf("Writing data sequence...");
-       for (size_t i = 0; i < 100; i++) {
-               gram_write(&ctx, &(ddr[i]), 0x12345678 + (1 << 10*i)%0x100000000);
+       for (i = 0; i < 128; i++) {
+               gram_write(&ctx, ddr_base+4*i, pattern[i]);
        }
        printf("done\n");
 
        printf("Reading data sequence...\n");
-       for (size_t i = 0; i < 256; i++) {
+       for (i = 0; i < 128; i++) {
                if ((i % kDumpWidth) == 0) {
-                       printf("%08x | ", (uint32_t)&(ddr[i]));
+                       printf("%08x | ", ddr_base+4*i);
                }
 
-               read_value = gram_read(&ctx, &(ddr[i]));
-               expected_value = 0x12345678 + (1 << 10*i)%0x100000000;
+               read_value = gram_read(&ctx, ddr_base+4*i);
+               expected_value = pattern[i];
 
                for (int j = 3; j >= 0; j--) {
                        if (((uint8_t*)(&read_value))[j] != ((uint8_t*)(&expected_value))[j]) {