Diff: pre-main/fetch_host_command.cpp

Revision:

29:e890b0fdce53

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pre-main/fetch_host_command.cpp	Tue Oct 29 10:59:34 2019 +0800
@@ -0,0 +1,45 @@
+/* 
+ * Copyright (c) 2019 Nuvoton Technology Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mbed.h"
+
+/* Fetch host command communicating via USB VCOM
+ *
+ * WARNING: For mass production, remove this file.
+ */
+
+/* Check weak reference/definition at the link:
+ * http://www.keil.com/support/man/docs/ARMLINK/armlink_pge1362065917715.htm */
+
+extern "C" {
+    MBED_USED int fetch_host_command(void);
+}
+
+int fetch_host_command(void)
+{
+    struct pollfd fds[1];
+
+    fds[0].fd = STDIN_FILENO;
+    fds[0].events = POLLIN;    
+    int rc = poll(fds, sizeof(fds)/sizeof(fds[0]), 0);
+    if ((rc > 0) && (fds[0].revents & POLLIN)) {
+        return getchar();
+    } else {
+        return -1;
+    }
+}