merging changes from OPAE branch making this branch

driver/tests/demo/demo.cpp

@@ -0,0 +1,75 @@
+#include <iostream>
+#include <unistd.h>
+#include <vortex.h>
+
+const char* program_file = nullptr;
+
+static void show_usage() {
+   std::cout << "Vortex Driver Test." << std::endl;
+   std::cout << "Usage: -f: program [-h: help]" << std::endl;
+}
+
+static void parse_args(int argc, char **argv) {
+  int c;
+  while ((c = getopt(argc, argv, "f:h?")) != -1) {
+    switch (c) {
+    case 'f': {
+      program_file = optarg;
+    } break;
+    case 'h':
+    case '?': {
+      show_usage();
+      exit(0);
+    } break;
+    default:
+      show_usage();
+      exit(-1);
+    }
+  }
+
+  if (nullptr == program_file) {
+    show_usage();
+    exit(-1);
+  }
+}
+
+int main(int argc, char *argv[]) {
+  int err;
+  
+  // parse command arguments
+  parse_args(argc, argv);
+
+  // open device connection
+  vx_device_h device;
+  err = vx_dev_open(&device);
+  if (err != 0)
+    return -1;
+
+  // upload program
+  err = vx_upload_kernel_file(device, program_file);
+  if (err != 0) {
+    vx_dev_close(device);
+    return -1;  
+  }
+
+  // start device
+  err = vx_start(device);
+  if (err != 0) {
+    vx_dev_close(device);
+    return -1;  
+  }
+
+  // wait for completion
+  err = vx_ready_wait(device, -1);
+  if (err != 0) {
+    vx_dev_close(device);
+    return -1;  
+  }
+
+  // close device
+  vx_dev_close(device);
+
+  printf("done!\n");
+
+  return 0;
+}