116 lines
3.8 KiB
ArmAsm
116 lines
3.8 KiB
ArmAsm
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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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; -- main.s
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; --
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; -- CT1 P03 Transferbefehle
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; --
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; -- $Id: transbf.s 552 2014-09-01 15:06:12Z 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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MY_CONST EQU 0x12
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ADDR_DIP_SWITCH_31_0 EQU 0x60000200
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ADDR_LED_31_0 EQU 0x60000100
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; ------------------------------------------------------------------
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; -- Variables
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; ------------------------------------------------------------------
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AREA MyAsmVar, DATA, READWRITE
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store_table SPACE 16 ; reserve 16 byte (4 words)
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ALIGN
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; ------------------------------------------------------------------
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; -- Constants
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; ------------------------------------------------------------------
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AREA MyAsmConst, DATA, READONLY
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addr_dip_switch DCD 0x60000200
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const_table DCD 0x01234567, 0x12345678, 0x99996666, 0x34567890
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ALIGN
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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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; MOV/MOVS instruction, loading constants
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MOVS R1, #0xfe ; ***A1***
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MOV R10, R1
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MOVS R2, #MY_CONST
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MOV R11, R2 ; ***A2***
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; load value of dip switches to R4
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LDR R3, =ADDR_DIP_SWITCH_31_0 ; ***A3***
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LDR R4, [R3]
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; LDR literal, load value of addr_dip_switch to R7
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LDR R7, addr_dip_switch ; ***A4***
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LDR R0, [R7]
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; write value of dip switches to LEDs
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LDR R6, =ADDR_LED_31_0
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STR R0, [R6]
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; LDR pseudo instruction, load address of addr_dip_switch to R7
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LDR R7, =addr_dip_switch ; ***A5***
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LDR R0, [R7]
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; write address of dip switches to LEDs
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LDR R6, =ADDR_LED_31_0
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STR R0, [R6]
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; read values from const_table
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LDR R7, =const_table
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LDR R0, [R7]
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LDR R1, [R7, #4] ; ***A6***
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MOVS R6, #8
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LDR R2, [R7, R6]
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MOVS R6, #12
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LDR R3, [R7, R6] ; ***A7***
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; write values to store_table
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LDR R7, =store_table
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STR R0, [R7]
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STR R1, [R7,#4]
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MOVS R6, #8
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STR R2, [R7,R6]
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MOVS R6, #12
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STR R3, [R7,R6]
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; write third value from store_table to leds
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MOVS R1, #8
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LDR R7, =store_table
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LDR R0, [R7, R1]
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LDR R6, =ADDR_LED_31_0
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STR R0, [R6]
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; load multiple registers from memory
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LDR R0, =const_table
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LDM R0!, {R4, R5, R6, R7}
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B main
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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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