Have you tried to develop a key input feature on your small embedded platform with a serial input? It is not so easy to implement correctly because the input methodology is using a complicated protocol known as VT100. In my recent project "Natural Tiny Shell (NT-Shell)" provides VT100 compatible terminal control features for small embedded systems. However, the middleware is still large for small embedded processors such as 8-bit MCUs, 16-bit MCUs and also for small 32-bit MCUs like Cortex-M0. This "MicroShell" middleware provides a minimal terminal control for the platforms.

Dependents:   MicroShellExample

Revision:
0:e91b984e285d
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/mscore.h	Sun Feb 05 03:55:01 2017 +0000
@@ -0,0 +1,114 @@
+/**
+ * @file      mscore.h
+ * @author    Shinichiro Nakamura (CuBeatSystems)
+ * ===============================================================
+ * MicroShell (Version 0.0.1)
+ * Copyright (c) 2016, 2017 Shinichiro Nakamura (CuBeatSystems)
+ * ===============================================================
+ * The MIT License : https://opensource.org/licenses/MIT
+ *
+ * Copyright (c) 2016, 2017 Shinichiro Nakamura (CuBeatSystems)
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef MSCORE_H
+#define MSCORE_H
+
+#define MSCORE_BUFFER_SIZE     (8)
+#define MSCORE_INITIALIZER()   { .keycnt = 0, .keybuf = {0} }
+
+typedef enum {
+    MSCORE_ACTION_IGNORE,
+    MSCORE_ACTION_DISPLAYABLE,
+    MSCORE_ACTION_BS,
+    MSCORE_ACTION_DEL,
+    MSCORE_ACTION_TAB,
+    MSCORE_ACTION_INSERT,
+    MSCORE_ACTION_ENTER,
+    MSCORE_ACTION_CTRL_A,
+    MSCORE_ACTION_CTRL_B,
+    MSCORE_ACTION_CTRL_C,
+    MSCORE_ACTION_CTRL_D,
+    MSCORE_ACTION_CTRL_E,
+    MSCORE_ACTION_CTRL_F,
+    MSCORE_ACTION_CTRL_G,
+    MSCORE_ACTION_CTRL_H,
+    MSCORE_ACTION_CTRL_I,
+    MSCORE_ACTION_CTRL_J,
+    MSCORE_ACTION_CTRL_K,
+    MSCORE_ACTION_CTRL_L,
+    MSCORE_ACTION_CTRL_M,
+    MSCORE_ACTION_CTRL_N,
+    MSCORE_ACTION_CTRL_O,
+    MSCORE_ACTION_CTRL_P,
+    MSCORE_ACTION_CTRL_Q,
+    MSCORE_ACTION_CTRL_R,
+    MSCORE_ACTION_CTRL_S,
+    MSCORE_ACTION_CTRL_T,
+    MSCORE_ACTION_CTRL_U,
+    MSCORE_ACTION_CTRL_V,
+    MSCORE_ACTION_CTRL_W,
+    MSCORE_ACTION_CTRL_X,
+    MSCORE_ACTION_CTRL_Y,
+    MSCORE_ACTION_CTRL_Z,
+    MSCORE_ACTION_F1,
+    MSCORE_ACTION_F2,
+    MSCORE_ACTION_F3,
+    MSCORE_ACTION_F4,
+    MSCORE_ACTION_F5,
+    MSCORE_ACTION_F6,
+    MSCORE_ACTION_F7,
+    MSCORE_ACTION_F8,
+    MSCORE_ACTION_F9,
+    MSCORE_ACTION_F10,
+    MSCORE_ACTION_F11,
+    MSCORE_ACTION_F12,
+    MSCORE_ACTION_ARROW_UP,
+    MSCORE_ACTION_ARROW_DOWN,
+    MSCORE_ACTION_ARROW_LEFT,
+    MSCORE_ACTION_ARROW_RIGHT,
+    MSCORE_ACTION_HOME,
+    MSCORE_ACTION_END,
+    MSCORE_ACTION_PAGE_UP,
+    MSCORE_ACTION_PAGE_DOWN,
+} MSCORE_ACTION;
+
+typedef struct {
+    int keycnt;
+    char keybuf[MSCORE_BUFFER_SIZE];
+} MSCORE;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void mscore_init(MSCORE *handle);
+MSCORE_ACTION mscore_push(MSCORE *handle, char c);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+