Use Chain for dsptools example.

Rename examples, bump dsptools to master, and incorporate feedback.

tests/streaming-passthrough.c

@@ -0,0 +1,49 @@
+#define PASSTHROUGH_WRITE 0x2000
+#define PASSTHROUGH_WRITE_COUNT 0x2008
+#define PASSTHROUGH_READ 0x2100
+#define PASSTHROUGH_READ_COUNT 0x2108
+
+#include "mmio.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+int main(void)
+{
+  printf("Starting writing\n");
+  uint32_t test_vector[7] = {3, 2, 1, 0, -1, -2, -3} ;
+  for (int i = 0; i < 7; i++) {
+    reg_write64(PASSTHROUGH_WRITE, test_vector[i]);
+  }
+
+  printf("Done writing\n");
+  uint32_t rcnt = reg_read32(PASSTHROUGH_READ_COUNT);
+  printf("Write count: %d\n", reg_read32(PASSTHROUGH_WRITE_COUNT));
+  printf("Read count: %d\n", rcnt);
+
+  int failed = 0;
+  if (rcnt != 0) {
+    for (int i = 0; i < 7; i++) {
+      uint32_t res = reg_read32(PASSTHROUGH_READ);
+      uint32_t expected = test_vector[i];
+      if (res == expected) {
+        printf("\n\nPass: Got %d Expected %d\n\n", res, test_vector[i]);
+      } else {
+        failed = 1;
+        printf("\n\nFail: Got %d Expected %d\n\n", res, test_vector[i]);
+      }
+    }
+  } else {
+    failed = 1;
+  }
+
+  if (failed) {
+    printf("\n\nSome tests failed\n\n");
+  } else {
+    printf("\n\nAll tests passed\n\n");
+  }
+  
+  return 0;
+}