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Index > Examples and Tutorials > ARM Example + Emulation for PL110

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uart777



Joined: 17 Jan 2012
Posts: 369
uart777
For learning ARM assembler: 2 small ARM examples + QEMU emulator for the ARM PrimeCell PL110 Color LCD Controller: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0161e/I904755.html

A fast, easy way to test ARM code+graphics in under 5 seconds without an expensive simulator. No setup required. To test an example, click the corresponding *.BAT. For some reason, QEMU runs the examples most (70%?) of the time, but not always. If QEMU appears with a black screen ("[Stopped]"), close and try again 1-3 times.

Download: Click Here

Image
Image
Have fun! Cool
Post 29 Jul 2013, 10:40
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uart777



Joined: 17 Jan 2012
Posts: 369
uart777
Previews of recent projects: ARM Visual Reference and Future Macro Language:

Image

Click to Enlarge:

ARM VR: http://sungod777.zxq.net/arm.jpg
Future ML: http://sungod777.zxq.net/fml.jpg


Last edited by uart777 on 10 Aug 2013, 09:25; edited 1 time in total
Post 29 Jul 2013, 11:09
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cod3b453



Joined: 25 Aug 2004
Posts: 619
cod3b453
Thanks for sharing this. As it happens, I was wondering today how you'd put something like this together - I hadn't realised there was a qemu for ARM - but I doubt I'll try porting my "OS" Laughing
Post 29 Jul 2013, 17:08
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uart777



Joined: 17 Jan 2012
Posts: 369
uart777
cod3b453: And thanks for your contributions. QEMU supports various CPUs: Intel, ARM, MIPS, PPC, etc.

Noticed one mistake: At the end of DRAW.INC, forgot align 4 before name:
Code:
; create image file/s+structure/s...

macro IMAGE [p] {
common
 local w, h
forward
 match name==f, p \{
  align 4
  name\#.file: file \
   'IMAGE\'\#\`f\#'.IMAGE'
   load w word from name\#.file+2
   load h word from name\#.file+6
  align 4
  name:
   .p dw name\#.file+16
   .x dw (SCREEN.W/2)-(w/2)
   .y dw (SCREEN.H/2)-(h/2)
   .w dw w
   .h dw h
 \}
}    


Last edited by uart777 on 06 Aug 2013, 14:57; edited 1 time in total
Post 29 Jul 2013, 19:26
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uart777



Joined: 17 Jan 2012
Posts: 369
uart777
Future Macro Language:
Code:
. r0=0, r1=3, while r0<r1, r0++, endw
. r0=0, r1=3, repeat r1, r0++, endr
. loop r0=0 to r1, r2++, endl

. (i8) *r0=*r1, (u8) *r0=*r1++
. (i16) *r0++=*r1, (u16) *r0++=*r1++
. (i32) r0=*r1++, (u32) *r0++=r1    


Last edited by uart777 on 08 Aug 2013, 23:45; edited 1 time in total
Post 01 Aug 2013, 06:23
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uart777



Joined: 17 Jan 2012
Posts: 369
uart777
New dialog design last night: "Create New Project".

Image

String functions...
Code:
; Future Macro Language...

function strlen(s)
. r0=s, r1=r0
. while (i8) *r0++, endw
. r0-r1, r0--
endf

function strcpy(a, b)
. r0=a, r1=b
. while (i8) *r1
 . (i8) *r0++=*r1++
. endw
. r0--, (i8) *r0=0
endf

function strcat(a, b)
. strlen(a), r0+a, strcpy(r0, b) 
endf    


Written in direct ARM assembler (no macros):
Code:
; strlen(s) - get string length

strlen:
stmfd sp!, { lr }
mov a2, a1
@@:
 ldrb a3, [a1], 1 ; a3=*a1++
 tst a3, a3       ; until 0
bne @b
sub a1, a1, a2    ; return n (a1=a1-a2-1)
sub a1, a1, 1
ldmfd sp!, { pc }

; strcpy(a, b) - string copy

strcpy:
stmfd sp!, { lr }
@@:
 ldrb a3, [a2], 1 ; a3=*a2++
 strb a3, [a1], 1 ; *a1++=a3
 tst a3, a3       ; until 0
bne @b
sub a1, a1, 1     ; return end
mov a3, 0
strb a3, [a1]
ldmfd sp!, { pc }

; strcat(a, b) - string concencate

strcat:
stmfd sp!, { lr }
mov v1, a1
mov v2, a2
bl strlen
add a1, a1, v1
mov a2, v2
bl strcpy
ldmfd sp!, { pc }    

Portable syntaxes generate optimized code for X86 + ARM:
Code:
; . (i8) *r0++=*r1++

movsx ebx, byte [ecx] ; X86...
inc ecx
mov byte [eax], bl
inc eax

ldrsb r10, [r1], 1 ; ARM...
strb r10, [r0], 1    


Preview in CodeVu with highlighted syntax+keywords:

Image
Post 08 Aug 2013, 23:45
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