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2022-10-21 08:06:07 +02:00
commit 71dac77d1b
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+; ------------------------------------------------------------------
+; --  _____       ______  _____                                    -
+; -- |_   _|     |  ____|/ ____|                                   -
+; --   | |  _ __ | |__  | (___    Institute of Embedded Systems    -
+; --   | | | '_ \|  __|  \___ \   Zurich University of             -
+; --  _| |_| | | | |____ ____) |  Applied Sciences                 -
+; -- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+; ------------------------------------------------------------------
+; --
+; -- add64.s
+; --
+; -- CT1 P05 64 Bit Addition
+; --
+; -- $Id: add64.s 3712 2016-10-20 08:44:57Z kesr $
+; ------------------------------------------------------------------
+;Directives
+        PRESERVE8
+        THUMB
+
+; ------------------------------------------------------------------
+; -- Symbolic Literals
+; ------------------------------------------------------------------
+ADDR_DIP_SWITCH_31_0        EQU     0x60000200
+ADDR_BUTTONS                EQU     0x60000210
+ADDR_LCD_RED                EQU     0x60000340
+ADDR_LCD_GREEN              EQU     0x60000342
+ADDR_LCD_BLUE               EQU     0x60000344
+ADDR_LCD_BIN                EQU     0x60000330
+MASK_KEY_T0                 EQU     0x00000001
+BACKLIGHT_FULL              EQU     0xffff
+
+; ------------------------------------------------------------------
+; -- myCode
+; ------------------------------------------------------------------
+        AREA MyCode, CODE, READONLY
+
+main    PROC
+        EXPORT main
+
+user_prog
+        LDR     R7, =ADDR_LCD_BLUE              ; load base address of pwm blue
+        LDR     R6, =BACKLIGHT_FULL             ; backlight full blue
+        STRH    R6, [R7]                        ; write pwm register
+
+        LDR     R0, =0                          ; lower 32 bits of total sum
+        LDR     R1, =0                          ; higher 32 bits of total sum
+endless
+        BL      waitForKey                      ; wait for key T0 to be pressed
+
+        ; STUDENTS: To be programmed
+
+
+
+
+        ; END: To be programmed
+        B       endless
+        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, =MASK_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