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Hi all,
same experiment for atmega32, on amd64 host.
same results, except that "usart_0.asm" is replaced by "usart.asm".
On 08/13/2013 03:21 PM, Mark Malmros wrote:
> Assembling Amforth5.0 for an Atmega328P using the Raspberry Pi avra
> instance:
>
> Untaring Amforth.5.0.tar.gz, I copied the "Appnotes" directory from
> Studio4 (on my desktop) into the core directory.
> Using template.asm edited for the atmega328p, set ".equ F_CPU = 16000000"
> (and and commented out the 1wire interface settings and added '.include
> "devices/atmega328p/device.inc"' to the dict_appl.inc file):
>
> pi@raspberrypi /home/amforth50/appl/template $ sudo avra -fI -I
> ../../core -I ../../core/devices/ -I ../../core/Appnotes template.asm
>
> Pass 1...
> template.asm(42) : Error : Found no label/variable/constant named bm_ASYNC
> template.asm(46) : Error : Found no label/variable/constant named
> bm_ENABLE_TX
>
> Looking in core/devices/usart_0.asm, both bm_ASYNC and bm_ENABLE_TX are
> there with .equ.
> A simplistic analysis suggests that there is an issue with forward
> referencing with avra that avrasm.exe or Studio4 doesn't have. Thinking
> that the .include order is important, I simply moved
>
> .include "drivers/usart_0.asm"
>
> just above
>
> .set WANT_ISR_RX = 1 ; interrupt driven receive
> .set WANT_ISR_TX = 0 ; send slowly but with less code space
>
> in my template file and re-assembled with avra...
>
> Pass 1...
> Pass 2...
> ../../core/words/brackettick.asm(6) : Warning : A .DB segment with an odd
> number of bytes is detected. A zero byte is added.
> ../../core/words/tick.asm(6) : Warning : A .DB segment with an odd number
> of bytes is detected. A zero byte is added.
> done
>
> Assembly complete with no errors (2 warnings).
> Segment usage:
> Code : 4223 words (8446 bytes)
> Data : 221 bytes
> EEPROM : 82 bytes
>
>
> The resulting template.hex and template.eep.hex ( > template.eep) were
> flashed on to a Atmega328P using avrdude. The terminal prompt came up! I
> loaded atmega328p.frt and a simple stepper motor program and it ran.
>
I compared the hexfiles created via wine+avrasm2 and avra. template.eep.hex
files are identical. template.hex files are different in 2 bytes only:
$ diff -wu 1_avrasm2_template.hex template.hex
- --- 1_avrasm2_template.hex 2013-08-13 20:34:45.795745430 +0200
+++ template.hex 2013-08-13 20:36:38.354121499 +0200
@@ -20,7 +20,7 @@
:02004C000BD0D7
:1000500009D00008000400701500080041546D65C7
:04006000676133326F
- -:040000000C94E50572
+:02000000E4C555
:100064000A920FB60A920F900F900A9400926000C1
:1000740009900FBE09906894089505FF665F637048
:10008400750000000A38413800C04138A8002438FF
Turns out this is the PFA_COLD jump (look in .lst files)
wine+avrasm2:
- -----------------------------------------------------
.set pc_ = pc
.org $0000
000000 940c 05e5 jmp_ PFA_COLD
.org pc_
.include "drivers/generic-isr.asm"
- -----------------------------------------------------
avra:
- -----------------------------------------------------
.set pc_ = pc
.org $0000
C:000000 + jmp_ PFA_COLD
.ifdef PFA_COLD
.if (PFA_COLD-pc > 2040) || (pc-PFA_COLD>2040)
C:000000 c5e4 rjmp PFA_COLD
.endif
.else
.org pc_
- -----------------------------------------------------
Seems like avra expands jmp_ to rjmp, whereas avrasm2 does it differently.
The controller talks to me in both cases, so this is not a significant
difference --- cold is executed in any case.
Cheers,
Erich
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