CCS :: View topic - disassembly listing is blank when I do this...

FAQ

Forum Help

Official CCS Support

Profile Log in to check your private messages Log in

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support

disassembly listing is blank when I do this...

CCS Forum Index -> General CCS C Discussion

View previous topic :: View next topic

Author

Message

[email protected]

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 [email protected]
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

Display posts from previous:

	CCS Forum Index -> General CCS C Discussion	All times are GMT - 6 Hours
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum