add pico_multi_booter code

Code/pico_multi_booter/picomite/PS2Keyboard.h

@@ -0,0 +1,65 @@
+/* 
+ * @cond
+ * The following section will be excluded from the documentation.
+ */
+/*
+ * Keyboard.h
+ *
+ *  Created on: 20 Apr 2019
+ *      Author: Peter
+ */
+
+#ifndef PS2KEYBOARD_H_
+#define PS2KEYBOARD_H_
+/* *********************************************************************************************************************
+MMBasic
+
+Keyboard.h
+
+Include file that contains the globals and defines for Keyboard.c in MMBasic.
+
+Copyright 2011 - 2018 Geoff Graham.  All Rights Reserved.
+
+This file and modified versions of this file are supplied to specific individuals or organisations under the following
+provisions:
+
+- This file, or any files that comprise the MMBasic source (modified or not), may not be distributed or copied to any other
+  person or organisation without written permission.
+
+- Object files (.o and .hex files) generated using this file (modified or not) may not be distributed or copied to any other
+  person or organisation without written permission.
+
+- This file is provided in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+************************************************************************************************************************/
+
+
+// global keyboard functions
+extern void initKeyboard(void);
+extern void CNInterrupt(uint64_t dd);
+extern void MNInterrupt(uint64_t dd); 
+extern void CheckKeyboard(void);
+extern volatile int PS2code;
+extern volatile bool PS2int;
+// definition of the keyboard PS/2 state machine
+#define PS2START    0
+#define PS2BIT      1
+#define PS2PARITY   2
+#define PS2STOP     3
+#define PS2COMMAND	4
+#define PS2ERROR    9
+
+// definitions related to setting the keyboard type
+#define NO_KEYBOARD             0
+#define CONFIG_US		1
+#define CONFIG_FR		2
+#define CONFIG_GR		3
+#define CONFIG_IT		4
+#define CONFIG_BE		5
+#define CONFIG_UK		6
+#define CONFIG_ES		7
+#define CONFIG_BR		8
+#define CONFIG_I2C  128
+#endif /* PS2KEYBOARD_H_ */
+/*  @endcond */