2022-10-28 07:48:37 +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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; -- main.s
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; --
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; -- CT1 P06 "ALU und Sprungbefehle" mit MUL
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; --
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; -- $Id: main.s 4857 2019-09-10 17:30:17Z akdi $
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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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; -- Address Defines
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; ------------------------------------------------------------------
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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_DIP_SWITCH_7_0 EQU 0x60000200
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ADDR_DIP_SWITCH_15_8 EQU 0x60000201
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ADDR_7_SEG_BIN_DS3_0 EQU 0x60000114
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ADDR_BUTTONS EQU 0x60000210
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ADDR_LCD_RED EQU 0x60000340
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ADDR_LCD_GREEN EQU 0x60000342
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ADDR_LCD_BLUE EQU 0x60000344
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LCD_BACKLIGHT_FULL EQU 0xffff
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2022-10-28 09:22:16 +02:00
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LCD_BACKLIGHT_OFF EQU 0x0000
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MASK_LOW_NIBBLE EQU 0xf
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FACTOR_10 EQU 0xa
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BITMASK_KEY_T0 EQU 0x01
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2022-10-28 07:48:37 +02:00
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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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ENTRY
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main PROC
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export main
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; STUDENTS: To be programmed
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2022-10-28 09:22:16 +02:00
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LDR R2, =MASK_LOW_NIBBLE
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2022-10-28 07:48:37 +02:00
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2022-10-28 09:22:16 +02:00
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; Load BCD Tens in R0
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LDR R0, =ADDR_DIP_SWITCH_15_8
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LDRB R0, [R0]
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ANDS R0, R0, R2
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2022-10-28 07:48:37 +02:00
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2022-10-28 09:22:16 +02:00
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; Load BCD Ones in R1
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LDR R1, =ADDR_DIP_SWITCH_7_0
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LDRB R1, [R1]
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ANDS R1, R1, R2
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; Check if T0 is pressed. If pressed goto CalcByMult
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LDR R3, =ADDR_BUTTONS ; load base address of keys
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LDR R4, =BITMASK_KEY_T0 ; load key mask T0
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LDRB R2, [R3] ; load key values
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TST R2, R4 ; check, if key T0 is pressed
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BEQ CalcByMult ; goto CalcByMult
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CalcByBitShift
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; set the LCD background to red
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LDR R2, =ADDR_LCD_RED
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LDR R3, =0xffff
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STRH R3, [R2]
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LDR R2, =ADDR_LCD_BLUE
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LDR R3, =0x0
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STRH R3, [R2]
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; Calculate Bin Value to R2 by Bit Shifting
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; R2 = R0 * 10
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LSLS R2, R0, #3
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LSLS R3, R0, #1
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ADDS R2, R2, R3
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ADDS R2, R2, R1
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EndCalcByBitShift
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; goto EndCalcByMult
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B EndCalcByMult
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CalcByMult
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; set the LCD background to blue
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LDR R2, =ADDR_LCD_RED
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LDR R3, =0x0
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STRH R3, [R2]
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LDR R2, =ADDR_LCD_BLUE
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LDR R3, =0xffff
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STRH R3, [R2]
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; Calculate Bin Value to R2 by Multiplication
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; R2 = R0 * 10
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LDR R2, =FACTOR_10
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MULS R2, R0, R2
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ADDS R2, R2, R1
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EndCalcByMult
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; Shift BCD Tens in high Nibble in R0
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; Add BCD Ones in low Nibble in R0
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LSLS R0, R0, #4
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ORRS R0, R0, R1
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; Add Bin Value in higher Byte in R0
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LSLS R2, R2, #8
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ORRS R0, R0, R2
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; Show R0 on LEDs
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LDR R2, =ADDR_LED_15_0
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STRH R0, [R2]
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; Show R0 on 7-Segment
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LDR R2, =ADDR_7_SEG_BIN_DS3_0
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STRH R0, [R2]
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2022-10-28 07:48:37 +02:00
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; END: To be programmed
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B main
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ENDP
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;----------------------------------------------------
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; Subroutines
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;----------------------------------------------------
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;----------------------------------------------------
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; pause for disco_lights
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pause PROC
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PUSH {R0, R1}
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LDR R1, =1
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LDR R0, =0x000FFFFF
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loop
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SUBS R0, R0, R1
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BCS loop
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POP {R0, R1}
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BX LR
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ALIGN
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ENDP
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; ------------------------------------------------------------------
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; End of code
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; ------------------------------------------------------------------
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END
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