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disassembly listing is blank when I do this...

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dlc@frii.com

Joined: 05 Nov 2003
Posts: 23

disassembly listing is blank when I do this...

Posted: Wed Feb 22, 2006 11:48 am

While correcting some FUBARs in my ISR code noted by our astute crowd here, I found something interesting. My disassembly window goes blank when I add a couple of assembler instructions. The following code works as expected:

Code:

#int_global
void isr(void)
{
#asm
   //store current state of processor
   MOVWF save_w
   SWAPF status,W
   MOVWF save_status
   BCF status,5                            //Set to page 0 for SFR's
   BCF status,6
#endasm

However, if I add the save_FSR code below, the disassembly listing goes away, which leaves me feeling uncomfortable:

Code:

#int_global
void isr(void)
{
#asm
   //store current state of processor
   MOVWF save_w
   SWAPF status,W
   MOVWF save_status
   SWAPF FSR,W
   MOVWF save_FSR
   BCF status,5                            //Set to page 0 for SFR's
   BCF status,6
#endasm

Does any CCS guru out there know what rule I just violated by doing this?

many thanks,
DLC
_________________
--
------------------------------------
Dennis Clark dlc@frii.com
http://www.techtoystoday.com
------------------------------------

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Wed Feb 22, 2006 1:17 pm

I can't compile your code as posted. It gets errors. Can you add the missing items, so it can be compiled ?

Guest

Posted: Wed Feb 22, 2006 7:01 pm

PCM programmer wrote:

I can't compile your code as posted. It gets errors.
Can you add the missing items, so it can be compiled ?

Sure, you will recognize it I'll bet...

thanks,
DLC

Code:

#include <16F628.h>
#fuses INTRC_IO,NOWDT,NOPROTECT,NOLVP,NOCPD,NOBROWNOUT,MCLR
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_B2, rcv=PIN_B1)
#use fast_io(A)
#use fast_io(B)

#define MAXBIT 13       //5 address, 7 control and one junk timing
int rise[MAXBIT];
int rW=0;
int gotOne = 0;

//save_w and save_status are at 7f and 7e which are available in ALL banks
int save_w;
#locate save_w=0x7f
int save_status;
#locate save_status=0x7e
int save_FSR;
#locate save_FSR=0x7d

#byte FSR = 4
#byte status = 3
#byte TMR1L = 0x0E
#byte TMR1H = 0x0F
#byte PIR1 = 0x0C
#byte CCPR1H = 0x16

#int_global
void isr(void)
{
#asm
   //store current state of processor
   MOVWF save_w
   SWAPF status,W
   MOVWF save_status
   SWAPF FSR,W
   MOVWF save_FSR
   BCF status,5                            //Set to page 0 for SFR's
   BCF status,6
#endasm

   rise[rW++] = CCPR1H;                      //save the pulse time
   if (rW == MAXBIT)
   {
      rW = 0;
}
gotOne = 1;
   TMR1L = 0;
   TMR1H = 0;

   #asm
   // restore processor and return from interrupt
   SWAPF save_FSR,W
   MOVWF FSR
   SWAPF save_status,W
   MOVWF status
   SWAPF save_w,F
   SWAPF save_w,W
   BCF PIR1,2
   #endasm
}

void main()
{
int x;
int n=0;

set_tris_B(0x03);
set_tris_A(0x00);

//Turn off comparator
setup_comparator(NC_NC_NC_NC);

   setup_ccp1(CCP_CAPTURE_FE); // Configure CCP1 to capture falling edge detection
   setup_timer_1(T1_INTERNAL); // Start timer 1

for (x=0;x<MAXBIT;x++)
   rise[x]=0;

   enable_interrupts(INT_CCP1); // Setup interrupt on falling edge
   enable_interrupts(GLOBAL);

printf("SONY IR decoder\n\r");

   while(TRUE)
{
delay_ms(500);
if (n)
{
   output_low(PIN_A1);
   n=0;
   }
   else
   {
      output_high(PIN_A1);
      n=1;
   }
if (gotOne)
{
      gotOne = 0;
   for (x=0;x<MAXBIT;x++)
      printf("\n\r%u %u counts ",x, rise[x]);
   }
   }
}

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Feb 22, 2006 7:16 pm

Quote:

My disassembly window goes blank when I add a couple of assembler instructions.

I'm not sure what you mean by 'blank'. Do you mean that you see
nothing at all, or that just the #int_global routine is missing ?

I compiled your program with PCM vs. 3.242 and MPLAB vs. 7.20.
Here is the code viewed from "View / Disassembly Listing" in MPLAB:

Code:

28: #int_global
29: void isr(void)
30: {
31: #asm
32: //store current state of processor
33: MOVWF save_w
0004 00FF MOVWF 0x7f
34: SWAPF status,W
0005 0E03 SWAPF 0x3, W
35: MOVWF save_status
0006 00FE MOVWF 0x7e
36: SWAPF FSR,W
0007 0E04 SWAPF 0x4, W
37: MOVWF save_FSR
0008 00FD MOVWF 0x7d
38: BCF status,5 //Set to page 0 for SFR's
0009 1283 BCF 0x3, 0x5
39: BCF status,6
000A 1303 BCF 0x3, 0x6
40: #endasm

The .LST file also looks OK:

Code:

0000 00372 .................... #int_global
0000 00373 .................... void isr(void)
0000 00374 .................... {
0000 00375 .................... #asm
0000 00376 ..... //store current state of processor
0000 00377 .................... MOVWF save_w
0004 00FF 00378 MOVWF 7F
0000 00379 .................... SWAPF status,W
0005 0E03 00380 SWAPF 03,W
0000 00381 .................... MOVWF save_status
0006 00FE 00382 MOVWF 7E
0000 00383 .................... SWAPF FSR,W
0007 0E04 00384 SWAPF 04,W
0000 00385 .................... MOVWF save_FSR
0008 00FD 00386 MOVWF 7D
0000 00387 .................... BCF status,5 //Set to page 0 for SFR's
0009 1283 00388 BCF 03.5
0000 00389 .................... BCF status,6
000A 1303 00390 BCF 03.6
0000 00391 .................... #endasm

Guest

Posted: Thu Feb 23, 2006 10:25 am

PCM programmer wrote:

Quote:

My disassembly window goes blank when I add a couple of assembler instructions.

I'm using 3.242 and MPLAB 7.01. When I pull up the view->disassembly listing I have a blank window. If I leave those offending lines out I have the usual disassembly listing. I note that the .lst file is there also.

DLC

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Thu Feb 23, 2006 10:55 am

I recommend that you upgrade to the latest version of MPLAB.

Guest

Posted: Thu Feb 23, 2006 1:16 pm

PCM programmer wrote:

I recommend that you upgrade to the latest version of MPLAB.

I just upgraded to MPLAB 7.20 (I already have PCM 3.242) and I get the same results as before.

There must be something else that is causing this problem.

DLC

dlc
Guest

Posted: Mon Feb 27, 2006 1:18 pm

Anonymous wrote:

PCM programmer wrote:

I recommend that you upgrade to the latest version of MPLAB.

I just upgraded to MPLAB 7.20 (I already have PCM 3.242) and I get the same results as before.

There must be something else that is causing this problem.

DLC

When I added other code in the ISR my dissassembly view magically re-appeared. It appears that there is some kind of bug in MPLAB. ;) Regardless, the code compiles and runs properly regardless of the MPLAB oddity.

thanks all,
DLC

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