#150095 - RickA - Tue Jan 29, 2008 10:03 pm
Is there any way to use the debug output functionality in No$Gba when developing homebrew DS programs?
#150103 - Dwedit - Wed Jan 30, 2008 12:21 am
I know that some of the devkitpro sample programs emit output to NO$GBA.
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#150129 - a128 - Wed Jan 30, 2008 9:40 am
| Dwedit wrote: |
| I know that some of the devkitpro sample programs emit output to NO$GBA. |
Via iprintf to the console which is on the subscreen by default on most examples
#150207 - eKid - Thu Jan 31, 2008 7:07 am
Here's my routine for no$ debug messages.
| Code: |
@--------------------------------------------
@ no$gba debug output function
@--------------------------------------------
.global nocashMessage
.text
.thumb
.align
.thumb_func
@--------------------------------------------
nocashMessage: @ params = { string }
@--------------------------------------------
@ max string length == 120 bytes
@----------------------------
@ copy string into buffer
@----------------------------
ldr r1,=1f @ get buffer address
mov r2, #30 @ max length = 120
3: ldrb r3, [r0,#0] @ load character
strb r3, [r1,#0] @ store character
cmp r3, #0 @ character == NULL?
beq 3f @ yes, send message
ldrb r3, [r0,#1] @ load character
strb r3, [r1,#1] @ store character
cmp r3, #0 @ character == NULL?
beq 3f @ yes, send message
ldrb r3, [r0,#2] @ load character
strb r3, [r1,#2] @ store character
cmp r3, #0 @ character == NULL?
beq 3f @ yes, send message
ldrb r3, [r0,#3] @ load character
strb r3, [r1,#3] @ store character
cmp r3, #0 @ character == NULL?
beq 3f @ yes, send message
add r0, #4 @ increment read position
add r1, #4 @ increment write position
sub r2, #1 @ decrement word counter
bne 3b @ loop if < 120 characters
@---------------------------
@ send message to no$
@---------------------------
3: mov r12,r12 @ first ID
b 2f @ skip the text section
.hword 0x6464 @ second ID
.hword 0 @ flags
1:
.space 120 @ data
2: bx lr @ exit
@--------------------------------------------
.pool
|
Just put that in a ".s" file and assemble it with the project.
Then from C you can do stuff like:
| Code: |
extern void nocashMessage( char* );
//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------
...
nocashMessage( "%zeroclks%" );
consoleInitDefault((u16*)SCREEN_BASE_BLOCK_SUB(31), (u16*)CHAR_BASE_BLOCK_SUB(0), 16);
nocashMessage( "%lastclks% cycles for console init" );
...
}
|
I find the %zeroclks% %lastclks% parameters very useful for profiling. There's a few more parameters you can use too.
http://nocash.emubase.de/gbahlp.htm#debugmessages
#150218 - RickA - Thu Jan 31, 2008 2:32 pm
That works beautifully! Thanks a lot eKid.
#150238 - josath - Thu Jan 31, 2008 9:55 pm
I just tried this, and it doesn't quite work for me. The no$gba window opens when I call it, but it just adds a bunch of blank lines.
Example: http://h.davr.org/nodebug.png
#150254 - eKid - Fri Feb 01, 2008 5:16 am
It might not work with GBA projects because code is usually ran from the cartridge (read only). It will still work if it's a multiboot file though (everything is copied to RAM). The code is kind of self-modifying (it just copies the string content into itself), so it needs to be in a writable memory section. This isn't really a problem with DS since you have to copy all code into memory first.
To fix for GBA you can change
to
| Code: |
| .section ".iwram", "ax", %progbits |
This will put the code in the IWRAM (internal work ram) section so it can modify the string contents.
#150260 - josath - Fri Feb 01, 2008 7:33 am
It was in a DS project that I had the problem...maybe it's my no$gba likes to spit out blank lines?
Could you provide a precompiled .nds which has some no$gba debug messages which I can test? thanks
#150261 - eKid - Fri Feb 01, 2008 8:13 am
Here, http://ekid.nintendev.com/nocashprint.nds
It prints a message from both CPUs.
#150274 - a128 - Fri Feb 01, 2008 12:30 pm
Your are talking about the No$GBA debug version of this great emulator?!
#150275 - RickA - Fri Feb 01, 2008 12:40 pm
| a128 wrote: |
| Your are talking about the No$GBA debug version of this great emulator?! |
I was. So not the free version, but the cheap homebrew version with assemblylevel debugging.
#150284 - nipil - Fri Feb 01, 2008 3:11 pm
| RickA wrote: |
| I was. So not the free version, but the cheap homebrew version with assemblylevel debugging. |
I ordered the same version on 25/01 via paypal, emailed the author about it too, and haven't received any feedback yet, just the paypal validation email. I'm quite impatient to get my hands on it, and i wonder what's happening... In the meantime, i'm learning to wait ;)
Edit: right after posting this, i took a look at my paypal account, and just saw that the money was removed from my bank account on 29/01. it should arrive soon !
_________________
NDS Lite Gold/Silver, MK5/R4DS, MSI PC54G2, D-Link DI-624
#150483 - nipil - Tue Feb 05, 2008 4:30 pm
Out of topic, but i anwser my previous post.
Martin replied me today about the home-debugger version.
I'll test it asap when i'm back home. Happy happy happy !
Now i "just" have to learn how to use the beast =)
_________________
NDS Lite Gold/Silver, MK5/R4DS, MSI PC54G2, D-Link DI-624