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; ------------------------------------------------------------------
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; -- _____ ______ _____ -
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; -- |_ _| | ____|/ ____| -
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; -- | | _ __ | |__ | (___ Institute of Embedded Systems -
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; -- | | | '_ \| __| \___ \ Zurich University of -
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; -- _| |_| | | | |____ ____) | Applied Sciences -
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; -- |_____|_| |_|______|_____/ 8401 Winterthur, Switzerland -
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; ------------------------------------------------------------------
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; --
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; -- add64.s
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; --
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; -- CT1 P05 64 Bit Addition
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; --
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; -- $Id: add64.s 3712 2016-10-20 08:44:57Z kesr $
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; ------------------------------------------------------------------
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;Directives
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PRESERVE8
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THUMB
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; ------------------------------------------------------------------
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; -- Symbolic Literals
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; ------------------------------------------------------------------
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ADDR_DIP_SWITCH_31_0 EQU 0x60000200
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ADDR_BUTTONS EQU 0x60000210
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ADDR_LCD_RED EQU 0x60000340
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ADDR_LCD_GREEN EQU 0x60000342
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ADDR_LCD_BLUE EQU 0x60000344
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ADDR_LCD_BIN EQU 0x60000330
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MASK_KEY_T0 EQU 0x00000001
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BACKLIGHT_FULL EQU 0xffff
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; ------------------------------------------------------------------
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; -- myCode
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; ------------------------------------------------------------------
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AREA MyCode, CODE, READONLY
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main PROC
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EXPORT main
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user_prog
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LDR R7, =ADDR_LCD_BLUE ; load base address of pwm blue
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LDR R6, =BACKLIGHT_FULL ; backlight full blue
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STRH R6, [R7] ; write pwm register
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LDR R0, =0 ; lower 32 bits of total sum
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LDR R1, =0 ; higher 32 bits of total sum
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endless
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BL waitForKey ; wait for key T0 to be pressed
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; STUDENTS: To be programmed
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2022-10-21 11:06:33 +02:00
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LDR R2, =ADDR_DIP_SWITCH_31_0
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LDR R2, [R2] ; Read Values of Dip Switches
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ADDS R0, R0, R2 ; Add Value of Dip Siwtches to R0
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MRS R4, APSR ; Read Flags to R4
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LSRS R4, R4, #29 ; Move Flags 24 Bit right
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LDR R5, =MASK_KEY_T0
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ANDS R4, R4, R5 ; Mask only carry Flag
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ADDS R1, R1, R4 ; Add Carry Flag to R1
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LDR R3, =ADDR_LCD_BIN
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STR R0, [R3, #0] ; write lower 32 Bits to LCD Display
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STR R1, [R3, #4] ; write higher 32 Bits to LCD Display
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2022-10-21 08:06:07 +02:00
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; END: To be programmed
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B endless
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ALIGN
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;----------------------------------------------------
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; Subroutines
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;----------------------------------------------------
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; wait for key to be pressed and released
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waitForKey
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PUSH {R0, R1, R2}
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LDR R1, =ADDR_BUTTONS ; laod base address of keys
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LDR R2, =MASK_KEY_T0 ; load key mask T0
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waitForPress
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LDRB R0, [R1] ; load key values
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TST R0, R2 ; check, if key T0 is pressed
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BEQ waitForPress
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waitForRelease
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LDRB R0, [R1] ; load key values
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TST R0, R2 ; check, if key T0 is released
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BNE waitForRelease
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POP {R0, R1, R2}
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BX LR
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ALIGN
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; ------------------------------------------------------------------
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; End of code
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; ------------------------------------------------------------------
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ENDP
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END
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