169 lines
4.3 KiB
ArmAsm
169 lines
4.3 KiB
ArmAsm
;* ------------------------------------------------------------------
|
|
;* -- _____ ______ _____ -
|
|
;* -- |_ _| | ____|/ ____| -
|
|
;* -- | | _ __ | |__ | (___ Institute of Embedded Systems -
|
|
;* -- | | | '_ \| __| \___ \ Zurich University of -
|
|
;* -- _| |_| | | | |____ ____) | Applied Sciences -
|
|
;* -- |_____|_| |_|______|_____/ 8401 Winterthur, Switzerland -
|
|
;* ------------------------------------------------------------------
|
|
;* --
|
|
;* -- Project : CT1 - Lab 7
|
|
;* -- Description : Control structures
|
|
;* --
|
|
;* -- $Id: main.s 3748 2016-10-31 13:26:44Z kesr $
|
|
;* ------------------------------------------------------------------
|
|
|
|
|
|
; -------------------------------------------------------------------
|
|
; -- Constants
|
|
; -------------------------------------------------------------------
|
|
|
|
AREA myCode, CODE, READONLY
|
|
|
|
THUMB
|
|
|
|
ADDR_LED_15_0 EQU 0x60000100
|
|
ADDR_LED_31_16 EQU 0x60000102
|
|
ADDR_7_SEG_BIN_DS1_0 EQU 0x60000114
|
|
ADDR_DIP_SWITCH_15_0 EQU 0x60000200
|
|
ADDR_HEX_SWITCH EQU 0x60000211
|
|
|
|
NR_CASES EQU 0xB
|
|
|
|
jump_table ; ordered table containing the labels of all cases
|
|
; STUDENTS: To be programmed
|
|
|
|
|
|
; END: To be programmed
|
|
|
|
|
|
; -------------------------------------------------------------------
|
|
; -- Main
|
|
; -------------------------------------------------------------------
|
|
|
|
main PROC
|
|
EXPORT main
|
|
|
|
read_dipsw ; Read operands into R0 and R1 and display on LEDs
|
|
; STUDENTS: To be programmed
|
|
|
|
LDR R0, =ADDR_DIP_SWITCH_15_0
|
|
LDRH R0, [R0] ; Load Values of DIP Switches 15-0 in R0
|
|
|
|
LDR R2, =ADDR_LED_15_0
|
|
STRH R0, [R2] ; Display R0 on LEDs 15-0
|
|
|
|
MOVS R1, R0 ; Coppy Bits to R1
|
|
LSRS R0, R0, #8 ; Shift Bits in R0 right to only have DIP SWITCH 15-8
|
|
LDR R2, =0xff ; Bitmask to get only lower Byte
|
|
ANDS R1, R1, R2 ; Only keep lower Byte in R1
|
|
|
|
LDR R2, =ADDR_LED_15_0
|
|
STRH R0, [R2]
|
|
|
|
; END: To be programmed
|
|
|
|
read_hexsw ; Read operation into R2 and display on 7seg.
|
|
; STUDENTS: To be programmed
|
|
|
|
LDR R2, =ADDR_HEX_SWITCH
|
|
LDRB R2, [R2]
|
|
|
|
LDR R3, =ADDR_7_SEG_BIN_DS1_0
|
|
STRB R2, [R3]
|
|
|
|
; END: To be programmed
|
|
|
|
case_switch ; Implement switch statement as shown on lecture slide
|
|
; STUDENTS: To be programmed
|
|
|
|
LDR R3, =0x0a
|
|
CMP R2, R3
|
|
BHI case_bright
|
|
|
|
LDR R3, =jump_table ; Get Address of Jumptable
|
|
LDRB R3, [R3, R2] ; Load Label Address from J
|
|
BX R3 ; GOTO Speified label
|
|
|
|
; END: To be programmed
|
|
|
|
|
|
; Add the code for the individual cases below
|
|
; - operand 1 in R0
|
|
; - operand 2 in R1
|
|
; - result in R0
|
|
|
|
case_dark
|
|
LDR R0, =0
|
|
B display_result
|
|
|
|
case_add
|
|
ADDS R0, R0, R1
|
|
B display_result
|
|
|
|
; STUDENTS: To be programmed
|
|
|
|
case_bright
|
|
LDR R0, =0xFFFF
|
|
B display_result
|
|
|
|
case_sub
|
|
SUBS R0, R0, R1
|
|
B display_result
|
|
|
|
case_mult
|
|
MULS R0, R1, R0
|
|
B display_result
|
|
|
|
case_and
|
|
ANDS R0, R0, R1
|
|
B display_result
|
|
|
|
case_or
|
|
ORRS R0, R0, R1
|
|
B display_result
|
|
|
|
case_xor
|
|
EORS R0, R0, R1
|
|
B display_result
|
|
|
|
case_not
|
|
MVNS R0, R0
|
|
B display_result
|
|
|
|
case_nand
|
|
ANDS R0, R0, R1
|
|
MVNS R0, R0
|
|
B display_result
|
|
|
|
case_nor
|
|
ORRS R0, R0, R1
|
|
MVNS R0, R0
|
|
B display_result
|
|
|
|
case_xnor
|
|
EORS R0, R0, R1
|
|
MVNS R0, R0
|
|
B display_result
|
|
|
|
|
|
; END: To be programmed
|
|
|
|
|
|
display_result ; Display result on LEDs
|
|
; STUDENTS: To be programmed
|
|
|
|
|
|
; END: To be programmed
|
|
|
|
B read_dipsw
|
|
|
|
ALIGN
|
|
ENDP
|
|
|
|
; -------------------------------------------------------------------
|
|
; -- End of file
|
|
; -------------------------------------------------------------------
|
|
END
|
|
|