Below this words, there is the last mail that I sent to tinyos-help. Check the
last two "push" at address 00000A4A and 00000A4B. The pushed registers,
shouldn't be R18 and R19 instead of R28 and R29? I'm using AT90CAN128, and
TinyOS 1.1
----- Mensaje reenviado ----
De: José Moyano <[EMAIL PROTECTED]>
Para: tinyos-help@Millennium.Berkeley.EDU
Enviado: jueves 28 de febrero de 2008, 15:35:43
Asunto: Re: [Tinyos-help] AVR GCC compiler problems
Thanks you all for your help. I check the "app.c", and is ok. Later, I load
"main.ihex" with AVR Studio, copy it to notepad, and find the problematic
routine code.
+00000A3C: 924F PUSH R4 Push register on stack
[CPSCAN]
+00000A3D: 925F PUSH R5 Push register on stack
+00000A3E: 926F PUSH R6 Push register on stack
+00000A3F: 927F PUSH R7 Push register on
stack
+00000A40: 928F PUSH R8 Push register on stack
+00000A41: 929F PUSH R9 Push register on stack
+00000A42: 92AF
PUSH R10 Push register on stack
+00000A43: 92BF PUSH R11 Push register on stack
+00000A44: 92CF PUSH R12 Push register on stack
+00000A45: 92DF PUSH R13 Push register on stack
+00000A46: 92EF PUSH R14 Push register on stack
+00000A47: 92FF PUSH R15 Push register on stack
+00000A48: 930F PUSH R16 Push register on stack
+00000A49: 931F PUSH R17 Push register on stack
+00000A4A: 93CF PUSH
R28 Push register on stack
+00000A4B: 93DF PUSH R29 Push register on stack
-------------------------------------------------------------------------
The parameters are saved here for the first call.
-------------------------------------------------------------------------
+00000A4C: 2E58 MOV
R5,R24 Copy register
+00000A4D: 014A MOVW R8,R20 Copy register pair
+00000A4E: 015B MOVW R10,R22 Copy register pair
+00000A4F:
0168 MOVW R12,R16 Copy register pair
+00000A50: 0179 MOVW R14,R18 Copy register pair
-------------------------------------------------------------------------
if (call CANReceive.setReceive[channel](id, mask)) {
------------------------------------------------------------------------
+00000A51: 940E0B1A CALL 0x00000B1A
Call subroutine <<<<<<<<<<< The first call
+00000A53: 2388 TST R24 Test for Zero or Minus
+00000A54: F409 BRNE PC+0x02 Branch if not equal
+00000A55: C0B0 RJMP PC+0x00B1 Relative jump
+00000A56: 0000 NOP No operation
+00000A57: 0000 NOP No operation
+00000A58: 0000 NOP No operation
+00000A59: 0000 NOP No operation
+00000A5A: 0000
NOP No operation
+00000A5B: 0000 NOP No operation
+00000A5C: 0000 NOP No operation
+00000A5D: 0000 NOP No operation
+00000A5E: 0000 NOP No operation
+00000A5F: 0000
NOP No operation
+00000A60: 0000 NOP No operation
+00000A61: 0000 NOP No operation
+00000A62: E087 LDI R24,0x07 Load immediate
+00000A63: 2E48 MOV R4,R24 Copy register
+00000A64: 0C45 ADD R4,R5 Add without carry
-------------------------------------------------------------------------
The parameters are restored here, for the second call
-------------------------------------------------------------------------
+00000A65: 01B5 MOVW R22,R10 Copy register pair
+00000A66: 01A4 MOVW R20,R8 Copy register pair
+00000A67: 2D84 MOV
R24,R4 Copy register
-------------------------------------------------------------------------
call CANReceive.setReceive[channel + 7](id, mask);
-------------------------------------------------------------------------
+00000A68: 940E0B1A CALL 0x00000B1A Call subroutine <<<<<<<<<<<
The second call
As you can see, in the second call, r20, r22 and r24 are reloaded, but r18 and
r16 are not. So one of my 32-bit parameters isn't reloaded. In the called
routine, r18 and r19 are used, but not saved in stack, so r18 and r19 change
their value. I don't know if this is an error, is it? Can I avoid this behavior
somehow?
command result_t CPSSetReceive.setReceive[uint8_t channel](uint32_t id,
uint32_t mask) {
if (call CANReceive.setReceive[channel](id, mask)) {
/*
//DEBUG
if (channel == 3)
if (mask != CAN_DEFAULT_MASK)
call Leds.yellowOff();
//*********************
*/
TOSH_wait_250ns();
TOSH_wait_250ns();
TOSH_wait_250ns();
TOSH_wait_250ns();
TOSH_wait_250ns();
TOSH_wait_250ns();
call CANReceive.setReceive[channel + 7](id, mask);
(...)
}
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