diadummy Testing serial device

user/diagdummy/serial.c

@@ -0,0 +1,21 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <ulib.h>
+
+void diagdummy_serialprint(void) {
+  char *str = "Hello world\n";
+
+  if (argslen() >= 2) {
+    str = args()[1];
+  }
+
+  Dev_t serialdev;
+  dev_gethandle(&serialdev, "serialdev");
+
+  char *s = str;
+  while (*s) {
+    while(!dev_cmd(&serialdev, DEV_SERIALDEV_SENDREADY, NULL, 0));
+    dev_cmd(&serialdev, DEV_SERIALDEV_SENDB, s, 1);
+    s++;
+  }
+}