2022-10-21 08:06:07 +02:00
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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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; -- sumdiff.s
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; --
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; -- CT1 P05 Summe und Differenz
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; --
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; -- $Id: sumdiff.s 705 2014-09-16 11:44:22Z muln $
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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_7_0 EQU 0x60000200
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ADDR_DIP_SWITCH_15_8 EQU 0x60000201
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ADDR_LED_7_0 EQU 0x60000100
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ADDR_LED_15_8 EQU 0x60000101
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ADDR_LED_23_16 EQU 0x60000102
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ADDR_LED_31_24 EQU 0x60000103
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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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; STUDENTS: To be programmed
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2022-10-21 09:52:24 +02:00
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LDR R0, =ADDR_DIP_SWITCH_7_0
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LDRB R0, [R0] ; Read DIP Switch 7-0 in R0
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LSLS R0, R0, #24 ; cast to 32 Bit
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LDR R1, =ADDR_DIP_SWITCH_15_8
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LDRB R1, [R1] ; Read DIP Switch 15-8 in R0
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LSLS R1, R1, #24 ; cast to 32 Bit
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LDR R2, =ADDR_LED_7_0
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ADDS R3, R0, R1 ; Add R0 + R1
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MRS R5, APSR ; Read Flags to R5
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LSRS R3, R3, #24 ; Move MSB to LSB
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STRB R3, [R2] ; Show LSB in LEDs 7-0
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LDR R2, =ADDR_LED_15_8
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LSRS R5, R5, #24 ; Move Flags 24 Bit right
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STRB R5, [R2] ; Show Flags in LED 15-12
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LDR R2, =ADDR_LED_23_16
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SUBS R3, R0, R1 ; Sub R0 - R1
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MRS R5, APSR ; Read Flags to R5
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MRS R5, APSR ; Read Flags to R5
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LSRS R3, R3, #24 ; Move MSB to LSB
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STRB R3, [R2] ; Show LSB in LEDs 15-8
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LDR R2, =ADDR_LED_31_24
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LSRS R5, R5, #24 ; Move Flags 24 Bit right
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STRB R5, [R2] ; Show Flags in LED 15-12
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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 user_prog
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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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