2022-11-03 13:33:48 +01:00
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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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;* -- Project : CT1 - Lab 7
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;* -- Description : Control structures
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;* --
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;* -- $Id: main.s 3748 2016-10-31 13:26:44Z kesr $
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;* ------------------------------------------------------------------
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; -------------------------------------------------------------------
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; -- Constants
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; -------------------------------------------------------------------
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AREA myCode, CODE, READONLY
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THUMB
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ADDR_LED_15_0 EQU 0x60000100
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ADDR_LED_31_16 EQU 0x60000102
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ADDR_7_SEG_BIN_DS1_0 EQU 0x60000114
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ADDR_DIP_SWITCH_15_0 EQU 0x60000200
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ADDR_HEX_SWITCH EQU 0x60000211
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NR_CASES EQU 0xB
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jump_table ; ordered table containing the labels of all cases
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; STUDENTS: To be programmed
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; END: To be programmed
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; -------------------------------------------------------------------
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; -- Main
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; -------------------------------------------------------------------
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main PROC
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EXPORT main
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read_dipsw ; Read operands into R0 and R1 and display on LEDs
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; STUDENTS: To be programmed
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2022-11-03 15:14:14 +01:00
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LDR R0, =ADDR_DIP_SWITCH_15_0
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LDRH R0, [R0] ; Load Values of DIP Switches 15-0 in R0
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LDR R2, =ADDR_LED_15_0
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STRH R0, [R2] ; Display R0 on LEDs 15-0
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MOVS R1, R0 ; Coppy Bits to R1
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LSRS R0, R0, #8 ; Shift Bits in R0 right to only have DIP SWITCH 15-8
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LDR R2, =0xff ; Bitmask to get only lower Byte
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ANDS R1, R1, R2 ; Only keep lower Byte in R1
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LDR R2, =ADDR_LED_15_0
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STRH R0, [R2]
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2022-11-03 13:33:48 +01:00
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; END: To be programmed
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read_hexsw ; Read operation into R2 and display on 7seg.
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; STUDENTS: To be programmed
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2022-11-03 15:14:14 +01:00
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LDR R2, =ADDR_HEX_SWITCH
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LDRB R2, [R2]
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LDR R3, =ADDR_7_SEG_BIN_DS1_0
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STRB R2, [R3]
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2022-11-03 13:33:48 +01:00
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; END: To be programmed
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case_switch ; Implement switch statement as shown on lecture slide
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; STUDENTS: To be programmed
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2022-11-03 15:14:14 +01:00
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LDR R3, =0x0a
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CMP R2, R3
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BHI case_bright
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LDR R3, =jump_table ; Get Address of Jumptable
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LDRB R3, [R3, R2] ; Load Label Address from J
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BX R3 ; GOTO Speified label
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2022-11-03 13:33:48 +01:00
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; END: To be programmed
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; Add the code for the individual cases below
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; - operand 1 in R0
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; - operand 2 in R1
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; - result in R0
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case_dark
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LDR R0, =0
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B display_result
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case_add
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ADDS R0, R0, R1
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B display_result
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; STUDENTS: To be programmed
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2022-11-03 15:14:14 +01:00
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case_bright
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LDR R0, =0xFFFF
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B display_result
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case_sub
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SUBS R0, R0, R1
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B display_result
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case_mult
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MULS R0, R1, R0
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B display_result
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case_and
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ANDS R0, R0, R1
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B display_result
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case_or
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ORRS R0, R0, R1
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B display_result
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case_xor
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EORS R0, R0, R1
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B display_result
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case_not
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MVNS R0, R0
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B display_result
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case_nand
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ANDS R0, R0, R1
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MVNS R0, R0
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B display_result
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case_nor
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ORRS R0, R0, R1
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MVNS R0, R0
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B display_result
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case_xnor
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EORS R0, R0, R1
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MVNS R0, R0
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B display_result
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2022-11-03 13:33:48 +01:00
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; END: To be programmed
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display_result ; Display result on LEDs
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; STUDENTS: To be programmed
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; END: To be programmed
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B read_dipsw
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ALIGN
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ENDP
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; -------------------------------------------------------------------
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; -- End of file
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; -------------------------------------------------------------------
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END
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