89 lines
3.0 KiB
ArmAsm
89 lines
3.0 KiB
ArmAsm
; ------------------------------------------------------------------
|
|
; -- _____ ______ _____ -
|
|
; -- |_ _| | ____|/ ____| -
|
|
; -- | | _ __ | |__ | (___ 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
|