Update memtest code

diff --git a/examples/headless/main.c b/examples/headless/main.c
index ee73eb814f1be839bade8ee3d685a4c0d0e4678a..7426d43cafa6c90ee543188f9c38bdb409fcbc6e 100644 (file)
--- a/examples/headless/main.c
+++ b/examples/headless/main.c
@@ -94,6 +94,7 @@ int serial_setup(const char *devname, int baudrate) {
 int main(int argc, char *argv[]) {
        struct gramCtx ctx;
        int serial_port, baudrate = 0;
+       uint32_t read_value, expected_value;
 
        if (argc != 3) {
                fprintf(stderr, "Usage: %s port baudrate\n", argv[0]);
@@ -115,10 +116,21 @@ int main(int argc, char *argv[]) {
        printf("done\n");
 
        printf("memtest... \n");
-       uint32_t *ddr = 0x10000000;
-       for (size_t i = 0; i < 1000; i++) {
-               gram_write(&ctx, &(ddr[i]), 0x12345678);
-               printf("%p = %08x\n", &(ddr[i]), gram_read(&ctx, &(ddr[i])));
+       volatile uint32_t *ddr = 0x10000000;
+
+       printf("Writing data sequence...");
+       for (size_t i = 0; i < 100; i++) {
+               gram_write(&ctx, &(ddr[i]), 0x12345678 + (1 << 10*i)%0x100000000);
+       }
+       printf("done\n");
+
+       for (size_t i = 0; i < 100; i++) {
+               read_value = gram_read(&ctx, &(ddr[i]));
+               expected_value = 0x12345678 + (1 << 10*i)%0x100000000;
+               printf("%p = %08x\n", &(ddr[i]), read_value);
+               if (read_value != expected_value) {
+                       printf("/!\\ DID NOT MATCH EXPECTED VALUE (%08x)\n", expected_value);
+               }
        }
 
        close(serial_port);