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+; ------------------------------------------------------------------
+; --  _____       ______  _____                                    -
+; -- |_   _|     |  ____|/ ____|                                   -
+; --   | |  _ __ | |__  | (___    Institute of Embedded Systems    -
+; --   | | | '_ \|  __|  \___ \   Zurich University of             -
+; --  _| |_| | | | |____ ____) |  Applied Sciences                 -
+; -- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+; ------------------------------------------------------------------
+; --
+; -- table.s
+; --
+; -- CT1 P04 Ein- und Ausgabe von Tabellenwerten
+; --
+; -- $Id: table.s 800 2014-10-06 13:19:25Z ruan $
+; ------------------------------------------------------------------
+;Directives
+        PRESERVE8
+        THUMB
+; ------------------------------------------------------------------
+; -- Symbolic Literals
+; ------------------------------------------------------------------
+ADDR_DIP_SWITCH_7_0         EQU     0x60000200
+ADDR_DIP_SWITCH_15_8        EQU     0x60000201
+ADDR_DIP_SWITCH_31_24       EQU     0x60000203
+ADDR_LED_7_0                EQU     0x60000100
+ADDR_LED_15_8               EQU     0x60000101
+ADDR_LED_23_16              EQU     0x60000102
+ADDR_LED_31_24              EQU     0x60000103
+ADDR_BUTTONS                EQU     0x60000210
+
+BITMASK_KEY_T0              EQU     0x01
+BITMASK_LOWER_NIBBLE        EQU     0x0F
+
+; ------------------------------------------------------------------
+; -- Variables
+; ------------------------------------------------------------------
+        AREA MyAsmVar, DATA, READWRITE
+; STUDENTS: To be programmed
+
+
+
+
+; END: To be programmed
+        ALIGN
+
+; ------------------------------------------------------------------
+; -- myCode
+; ------------------------------------------------------------------
+        AREA myCode, CODE, READONLY
+
+main    PROC
+        EXPORT main
+
+readInput
+        BL    waitForKey                    ; wait for key to be pressed and released
+; STUDENTS: To be programmed
+
+
+
+
+; END: To be programmed
+        B       readInput
+        ALIGN
+
+; ------------------------------------------------------------------
+; Subroutines
+; ------------------------------------------------------------------
+
+; wait for key to be pressed and released
+waitForKey
+        PUSH    {R0, R1, R2}
+        LDR     R1, =ADDR_BUTTONS           ; laod base address of keys
+        LDR     R2, =BITMASK_KEY_T0         ; load key mask T0
+
+waitForPress
+        LDRB    R0, [R1]                    ; load key values
+        TST     R0, R2                      ; check, if key T0 is pressed
+        BEQ     waitForPress
+
+waitForRelease
+        LDRB    R0, [R1]                    ; load key values
+        TST     R0, R2                      ; check, if key T0 is released
+        BNE     waitForRelease
+                
+        POP     {R0, R1, R2}
+        BX      LR
+        ALIGN
+
+; ------------------------------------------------------------------
+; End of code
+; ------------------------------------------------------------------
+        ENDP
+        END