avr-gcc-list
[Top][All Lists]
Advanced
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [avr-gcc-list] AVR simulator and interrupts

From: Klaus Rudolph
Subject: Re: [avr-gcc-list] AVR simulator and interrupts
Date: Wed, 14 Jul 2004 21:17:21 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; de-AT; rv:1.6) Gecko/20040114 
James Fitzsimons schrieb:

>Hi all,
>I am new to the AVR and am trying to write a few simple test programs
>before I get my stk500 and real parts. I have downloaded and installed
>Klaus's avr simulator, and have managed to get it working with DDD and
>avr-gdb.
>
>I can single step through my program and watch variable values as they
>change, however for some reason my Timer0 interrupt routine doesn't get
>called.
>
>I am using the build of the simulator found here
>(http://home.comcast.net/~Bill5107/index.html) and am running it with
>the command "simulavr -d at90s8515 -g".
>
>I have included my (extremely simple) program below. It is more than
>likely my own programming that is in error, so if anyone can help I
>would very much appreciate it.
>
>Cheers,
>James Fitzsimons
> > 

You must set the irq flag, please insert a
asm("sei");
somewhere after initialisation your timer to enable the cpu executing
the irq handler.
You will see (trace below) the following (maybe a bit differnt because you have not 
the same version of the simulator)
As you can see at time 10500 to 11000 there is the value named flag read
from 0x0060 into register, inverted
and wrote back to 0x0060. Thats all and it looks that the irq works as
it  should.

And what you also can see:
R0 is saved on the stack, R0 is then used as register to move status
register to the stack and
after that R1 is prepared as zero to be used in some later c code. And
after handling your "flag"
variable the stack is poped again. A lot of work and not all the
instructions are really needed.
Sometimes a bit handcrafting irq-handlers is absolutly needed to get the
needed speed :-)


Hope that helps
 Klaus



   8250 go 0x007a: main+0x14                      OUT 0x32, R24 Tcnt=0x01
   8250 go 0x007c: main+0x15                      SEI SREG=[I-----Z-]
go IrqSystem: IrqFlagCleared Vec: 7

   8500 go 0x007e: main+0x16                      LDI R18, 0xe7 R18=0xe7
   8500 go 0x0080: main+0x17                      IRQ DETECTED:
VectorAddr: 7go IrqSystem: IrqHandlerStarted Vec: 7
IRAM[0x025f,,__bss_end,_end+0x1fc]=0x40 SP=0x25e
IRAM[0x025e,,__bss_end,_end+0x1fb]=0x00 SP=0x25d
   8750 go 0x000e:
,,,,,,<Kommandozeile>,<eingebaut>,./config/avr/libgcc.S,<command
line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,timer.c,__tmp_reg__,__zero_reg__,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,__vectors,__vector_default,__heap_end+0x7 
CPU-waitstate
   8750 go 0x000e:
,,,,,,<Kommandozeile>,<eingebaut>,./config/avr/libgcc.S,<command
line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,timer.c,__tmp_reg__,__zero_reg__,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,__vectors,__vector_default,__heap_end+0x7 
CPU-waitstate
   9000 go 0x000e:
,,,,,,<Kommandozeile>,<eingebaut>,./config/avr/libgcc.S,<command
line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,timer.c,__tmp_reg__,__zero_reg__,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,__vectors,__vector_default,__heap_end+0x7 
CPU-waitstate
   9000 go 0x000e:
,,,,,,<Kommandozeile>,<eingebaut>,./config/avr/libgcc.S,<command
line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,timer.c,__tmp_reg__,__zero_reg__,./config/avr/libgcc.S,<command line>,<built-in>,/home/zfrdh/avrdownload/gcc-3.4.0/gcc//,./config/avr/libgcc.S,__vectors,__vector_default,__heap_end+0x7 
RJMP 9a
   9250 go 0x009a: __vector_7                     CPU-waitstate
   9250 go 0x009a: __vector_7                     PUSH R1
IRAM[0x025d,,__bss_end,_end+0x1fa]=0x00 SP=0x25c
   9500 go 0x009c: __vector_7+0x1                 CPU-waitstate
   9500 go 0x009c: __vector_7+0x1                 PUSH R0
IRAM[0x025c,,__bss_end,_end+0x1f9]=0x00 SP=0x25b
   9750 go 0x009e: __vector_7+0x2                 CPU-waitstate
   9750 go 0x009e: __vector_7+0x2                 IN R0, 0x3f R0=0x02
  10000 go 0x00a0: __vector_7+0x3                 PUSH R0
IRAM[0x025b,,__bss_end,_end+0x1f8]=0x02 SP=0x25a
  10000 go 0x00a2: __vector_7+0x4                 CPU-waitstate
  10250 go 0x00a2: __vector_7+0x4                 EOR R1, R1 R1=0x00
SREG=[------Z-]
  10250 go 0x00a4: __vector_7+0x5                 PUSH R24
IRAM[0x025a,,__bss_end,_end+0x1f7]=0x01 SP=0x259
  10500 go 0x00a6: __vector_7+0x6                 CPU-waitstate
  10500 go 0x00a6: __vector_7+0x6                 LDS R24, 0x60
IRAM[0x0060,,,flag,__data_end,__bss_start,_edata,__data_start]-->0x00-->
R24=0x00
  10750 go 0x00aa: __vector_7+0x8                 CPU-waitstate
  10750 go 0x00aa: __vector_7+0x8                 COM R24 R24=0xff
SREG=[---S-N-C]
  11000 go 0x00ac: __vector_7+0x9                 STS 0x60, R24
IRAM[0x0060,,,flag,__data_end,__bss_start,_edata,__data_start]=0xff
  11000 go 0x00b0: __vector_7+0xb                 CPU-waitstate
  11250 go 0x00b0: __vector_7+0xb                 POP R24 SP=0x25a
IRAM[0x025a,,__bss_end,_end+0x1f7]-->0x01--> R24=0x01
  11250 go 0x00b2: __vector_7+0xc                 CPU-waitstate
  11500 go 0x00b2: __vector_7+0xc                 POP R0 SP=0x25b
IRAM[0x025b,,__bss_end,_end+0x1f8]-->0x02--> R0=0x02
  11500 go 0x00b4: __vector_7+0xd                 CPU-waitstate
  11750 go 0x00b4: __vector_7+0xd                 OUT 0x3f, R0
SREG=[------Z-]
  11750 go 0x00b6: __vector_7+0xe                 POP R0 SP=0x25c
IRAM[0x025c,,__bss_end,_end+0x1f9]-->0x00--> R0=0x00
  12000 go 0x00b8: __vector_7+0xf                 CPU-waitstate
  12000 go 0x00b8: __vector_7+0xf                 POP R1 SP=0x25d
IRAM[0x025d,,__bss_end,_end+0x1fa]-->0x00--> R1=0x00
  12250 go 0x00ba: __vector_7+0x10                CPU-waitstate
  12250 go 0x00ba: __vector_7+0x10                RETI SP=0x25e
IRAM[0x025e,,__bss_end,_end+0x1fb]-->0x00--> SP=0x25f go IrqSystem:
IrqHandler Finished Vec: 7
IRAM[0x025f,,__bss_end,_end+0x1fc]-->0x40-->
reply via email to
[Prev in Thread] Current Thread [Next in Thread]