Random number generator (device): Difference between revisions
Content added Content deleted
Childishbeat (talk | contribs) m (A print statement has been added to the program to make it easier for the user to know when to press any key to generate the random number.) |
(Add task to ARM assembly Raspberry pi) |
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Ada.Text_IO.Put_Line ("Number:" & Integer'Image (Number)); |
Ada.Text_IO.Put_Line ("Number:" & Integer'Image (Number)); |
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end Random;</lang> |
end Random;</lang> |
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=={{header|ARM Assembly}}== |
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{{works with|as|Raspberry Pi}} |
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<lang ARM Assembly> |
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/* ARM assembly Raspberry PI */ |
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/* program urandom.s */ |
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/* Constantes */ |
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.equ STDOUT, 1 @ Linux output console |
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.equ EXIT, 1 @ Linux syscall |
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.equ READ, 3 |
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.equ WRITE, 4 |
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.equ OPEN, 5 |
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.equ CLOSE, 6 |
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.equ O_RDONLY, 0 @ open for reading only |
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.equ BUFFERSIZE, 4 @ random number 32 bits |
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/*******************************************/ |
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/* Fichier des macros */ |
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/********************************************/ |
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.include "../../ficmacros.s" |
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/* Initialized data */ |
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.data |
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szFileName: .asciz "/dev/urandom" @ see linux doc |
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szCarriageReturn: .asciz "\n" |
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/* datas error display */ |
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szMessErreur: .asciz "Error detected.\n" |
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szMessErr: .ascii "Error code hexa : " |
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sHexa: .space 9,' ' |
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.ascii " decimal : " |
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sDeci: .space 15,' ' |
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.asciz "\n" |
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/* datas message display */ |
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szMessResult: .ascii "Random number :" |
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sValue: .space 12,' ' |
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.asciz "\n" |
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/* UnInitialized data */ |
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.bss |
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sBuffer: .skip BUFFERSIZE @ buffer result |
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/* code section */ |
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.text |
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.global main |
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main: |
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ldr r0,iAdrszFileName @ File name |
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mov r1,#O_RDONLY @ flags |
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mov r2,#0 @ mode |
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mov r7,#OPEN @ open file |
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svc #0 |
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cmp r0,#0 @ error ? |
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ble error |
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mov r8,r0 @ save FD |
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mov r4,#0 @ loop counter |
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1: |
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mov r0,r8 @ File Descriptor |
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ldr r1,iAdrsBuffer @ buffer address |
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mov r2,#BUFFERSIZE @ buffer size |
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mov r7,#READ @ call system read file |
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svc 0 |
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cmp r0,#0 @ read error ? |
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ble error |
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ldr r1,iAdrsBuffer @ buffer address |
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ldr r0,[r1] @ display buffer value |
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ldr r1,iAdrsValue |
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bl conversion10 |
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ldr r0,iAdrszMessResult |
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bl affichageMess |
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add r4,#1 @ increment counter |
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cmp r4,#10 @ maxi ? |
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blt 1b @ no -> loop |
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end: |
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mov r0,r8 |
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mov r7, #CLOSE @ call system close file |
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svc #0 |
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cmp r0,#0 |
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blt error |
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mov r0,#0 @ return code |
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b 100f |
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error: |
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ldr r1,iAdrszMessErreur @ error message |
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bl displayError |
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mov r0,#1 @ return error code |
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100: @ standard end of the program |
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mov r7, #EXIT @ request to exit program |
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svc 0 @ perform system call |
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iAdrsBuffer: .int sBuffer |
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iAdrsValue: .int sValue |
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iAdrszMessResult: .int szMessResult |
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iAdrszFileName: .int szFileName |
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iAdrszMessErreur: .int szMessErreur |
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iAdrszCarriageReturn: .int szCarriageReturn |
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/******************************************************************/ |
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/* display text with size calculation */ |
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/******************************************************************/ |
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/* r0 contains the address of the message */ |
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affichageMess: |
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push {r0,r1,r2,r7,lr} @ save registers |
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mov r2,#0 @ counter length */ |
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1: @ loop length calculation |
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ldrb r1,[r0,r2] @ read octet start position + index |
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cmp r1,#0 @ if 0 its over |
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addne r2,r2,#1 @ else add 1 in the length |
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bne 1b @ and loop |
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@ so here r2 contains the length of the message |
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mov r1,r0 @ address message in r1 |
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mov r0,#STDOUT @ code to write to the standard output Linux |
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mov r7, #WRITE @ code call system "write" |
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svc #0 @ call system |
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pop {r0,r1,r2,r7,lr} @ restaur registers |
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bx lr @ return |
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/***************************************************/ |
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/* display error message */ |
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/***************************************************/ |
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/* r0 contains error code r1 : message address */ |
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displayError: |
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push {r0-r2,lr} @ save registers |
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mov r2,r0 @ save error code |
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mov r0,r1 |
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bl affichageMess |
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mov r0,r2 @ error code |
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ldr r1,iAdrsHexa |
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bl conversion16 @ conversion hexa |
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mov r0,r2 @ error code |
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ldr r1,iAdrsDeci @ result address |
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bl conversion10S @ conversion decimale |
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ldr r0,iAdrszMessErr @ display error message |
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bl affichageMess |
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100: |
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pop {r0-r2,lr} @ restaur registers |
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bx lr @ return |
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iAdrszMessErr: .int szMessErr |
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iAdrsHexa: .int sHexa |
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iAdrsDeci: .int sDeci |
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/******************************************************************/ |
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/* Converting a register to hexadecimal */ |
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/******************************************************************/ |
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/* r0 contains value and r1 address area */ |
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conversion16: |
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push {r1-r4,lr} @ save registers |
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mov r2,#28 @ start bit position |
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mov r4,#0xF0000000 @ mask |
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mov r3,r0 @ save entry value |
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1: @ start loop |
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and r0,r3,r4 @ value register and mask |
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lsr r0,r2 @ move right |
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cmp r0,#10 @ compare value |
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addlt r0,#48 @ <10 ->digit |
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addge r0,#55 @ >10 ->letter A-F |
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strb r0,[r1],#1 @ store digit on area and + 1 in area address |
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lsr r4,#4 @ shift mask 4 positions |
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subs r2,#4 @ counter bits - 4 <= zero ? |
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bge 1b @ no -> loop |
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100: |
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pop {r1-r4,lr} @ restaur registers |
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bx lr |
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/***************************************************/ |
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/* Converting a register to a signed decimal */ |
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/***************************************************/ |
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/* r0 contains value and r1 area address */ |
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conversion10S: |
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push {r0-r4,lr} @ save registers |
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mov r2,r1 @ debut zone stockage |
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mov r3,#'+' @ par defaut le signe est + |
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cmp r0,#0 @ negative number ? |
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movlt r3,#'-' @ yes |
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mvnlt r0,r0 @ number inversion |
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addlt r0,#1 |
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mov r4,#10 @ length area |
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1: @ start loop |
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bl divisionpar10U |
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add r1,#48 @ digit |
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strb r1,[r2,r4] @ store digit on area |
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sub r4,r4,#1 @ previous position |
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cmp r0,#0 @ stop if quotient = 0 |
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bne 1b |
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strb r3,[r2,r4] @ store signe |
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subs r4,r4,#1 @ previous position |
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blt 100f @ if r4 < 0 -> end |
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mov r1,#' ' @ space |
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2: |
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strb r1,[r2,r4] @store byte space |
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subs r4,r4,#1 @ previous position |
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bge 2b @ loop if r4 > 0 |
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100: |
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pop {r0-r4,lr} @ restaur registers |
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bx lr |
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/***************************************************/ |
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/* division par 10 unsigned */ |
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/***************************************************/ |
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/* r0 dividende */ |
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/* r0 quotient */ |
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/* r1 remainder */ |
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divisionpar10U: |
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push {r2,r3,r4, lr} |
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mov r4,r0 @ save value |
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//mov r3,#0xCCCD @ r3 <- magic_number lower raspberry 3 |
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//movt r3,#0xCCCC @ r3 <- magic_number higter raspberry 3 |
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ldr r3,iMagicNumber @ r3 <- magic_number raspberry 1 2 |
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umull r1, r2, r3, r0 @ r1<- Lower32Bits(r1*r0) r2<- Upper32Bits(r1*r0) |
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mov r0, r2, LSR #3 @ r2 <- r2 >> shift 3 |
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add r2,r0,r0, lsl #2 @ r2 <- r0 * 5 |
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sub r1,r4,r2, lsl #1 @ r1 <- r4 - (r2 * 2) = r4 - (r0 * 10) |
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pop {r2,r3,r4,lr} |
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bx lr @ leave function |
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iMagicNumber: .int 0xCCCCCCCD |
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</lang> |
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=={{header|Batch File}}== |
=={{header|Batch File}}== |
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The dynamic environmental variable <code>%random%</code> contains a number between 0 and 32767. |
The dynamic environmental variable <code>%random%</code> contains a number between 0 and 32767. |