ArmV7 simulation using cpulator

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if i want to print the value in seven segment display like 12. how can I do that?. i am currently working on cpulator armv7 mode. help will be appreciated.

.text .equ sevendisplay, 0xff200020 .global _start _start:

ldr r0, =sevendisplay @ Load the address of the seven-segment display mov r1, #12 //THIS THE REGISTER WITH VALUE

ldr r2, [r0]    //Load the current value from the display
and r2, r2, #0b0000000000000000 // two seven segment display 
orr r2, r2, r1  //Combine with the new value
str r2,[r0]

stop: mov r7,#1 swi 0 .end

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