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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Wed Jun 29, 2011 5:15 pm |
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Yes, I built it and saw the problem. But it's too hard for me
to scan it easily and pick out where the problem is. |
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brock
Joined: 29 Jun 2011
Posts: 8
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| PRINTF NOT PRINTING FLOATING POINT NUMBERS CORRECTLY |
| Posted: Wed Jun 29, 2011 9:23 pm |
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| Thanks for your help anyway! |
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CCS newby
Joined: 27 May 2011
Posts: 5
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| Posted: Thu Jun 30, 2011 2:01 am |
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| I was using a PIC16F886, compiler version PCM V4.109. |
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brock
Joined: 29 Jun 2011
Posts: 8
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| PRINTF NOT PRINTING FLOATING POINT NUMBERS CORRECTLY |
| Posted: Thu Jun 30, 2011 7:29 am |
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I found this thread interesting:
http://pic-c.ccsinfo.com/forum/viewtopic.php?t=6334&view=previous
Perhaps when the additional printf is added, the compiler recognises the variables as floats?
Also, I think I'll check my optimisation settings to see if that has an effect. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jun 30, 2011 2:50 pm |
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To CCS newby,
I made a test program according to your description and compiled it
with vs. 4.109 and ran it in MPLAB simulator. It works for me.
It displays this in the Output window:
Can you modify this program so that it fails ? If possible, keep the
program short. Maybe the problem only occurs if you have a lot of code,
but try to keep it short. If the program is short, it's easier for me to find
the problem.
Here's the test program that works:
| Code: |
#include <16F886.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
void my_func(void)
{
float tempf = 1.234;
printf("tempf= %f",tempf);
}
//======================================
void main()
{
my_func();
while(1);
} |
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CCS newby
Joined: 27 May 2011
Posts: 5
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| Posted: Fri Jul 01, 2011 1:30 am |
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Hi PCM Programmer,
I will try to "break" your program. Please bare with me though, I am very busy at work at the moment so I won't be able to do this straight away. |
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brock
Joined: 29 Jun 2011
Posts: 8
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| PRINTF NOT PRINTING FLOATING POINT NUMBERS CORRECTLY |
| Posted: Fri Jul 08, 2011 10:32 am |
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Hey PCM:
I took some time to reduce the code size to make the issue simpler to find. Comments describe how to make it work or fail:
| Code: |
/**********************************************************************
*
* Name: Why can't I print a float OR Man, there's a bug in this compiler
*
**********************************************************************/
#include <16F887.h>
#include <stdio.h>
#FUSES INTRC,NOWDT,PUT,MCLR,NOPROTECT,NOCPD,BROWNOUT,NOIESO,NOFCMEN,NOLVP
// Setup Clock
#use delay(internal=8M)
// Setup the Serial Port to (9600,8,N,1)
#use rs232(baud=9600,BITS=8,PARITY=N,STOP=1,xmit=PIN_C6,rcv=PIN_C7)
float adc_sample(int target_pot) // Function isn't called
{ //
return; //
// printf(" ADCS: %4.3f\r",2.2222); // (1) Uncomment this printf to make the main() printf work
} //
void set_pot_to_voltage(int pot_address, float target_voltage) // Function isn't called
{ //
return; //
printf("Note: In > Actual, Steps: 0x%04lx %Ld\r",0x4321,0x4321); // (2) Comment this printf and it works
} //
void main()
{
printf("\r\rTry to print a float...*\rTESTFLOAT: %4.3f\r",1.1111); // (3) Remove * and it works
while (1);
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jul 08, 2011 11:51 am |
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Doing some version testing with the PCM compiler gave these results.
It fails starting with vs. 4.100:
4.014 works
4.093 works
4.099 works
4.100 Fails
4.105 Fails
4.110 Fails
4.111 Fails
4.121 Fails
4.122 Fails
I know that CCS considered vs. 4.100 to be a major change:
http://www.ccsinfo.com/newsdesk_info.php?newsdesk_id=120
I also tested it with the PCH compiler with vs. 4.122 and an 18F452 and
it works. So the problem may be confined to the PCM compiler.
The next step is to compile test programs (smaller, if possible) for
versions 4.099 and 4.100 and look at the differences in the .LST file.
I'll try to do that later today. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jul 08, 2011 4:30 pm |
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I think there is a bug in the CCS printf library code starting with vs. 4.100
(at least for the PCM compiler) and I've been trying to come up with
some kind of work-around. But it's difficult to know for sure if a work-
around will work in every case. |
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freeman
Joined: 18 Jul 2011
Posts: 1
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| Possible Bug |
| Posted: Mon Jul 18, 2011 8:53 am |
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| Try to initialize the variables float to 1 (not zero), or other value, I have same problem and with this it is solved. |
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