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PRINTF an int32 with decimal points (faking a float value)

 
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ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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PRINTF an int32 with decimal points (faking a float value)
PostPosted: Sun Feb 07, 2010 11:07 pm     Reply with quote
Hi,

Is it possible to have %w formatting but with an int32 integer?

Example value of 999999 to be displayed like %4.2w (9999.99).

Passing an int32 with %w give me garbage prints on my lcd.

Have a nice day!
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 08, 2010 12:49 am     Reply with quote
You didn't specify your PIC or your version. So, I ran the following test
program with vs. 4.104 and a 14F452. MPLAB simulator gives me the
following result:
Quote:

9999.99

Code:

#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//======================================
void main(void)
{
int32 value;

value = 999999;

printf("%4.2w", value);

while(1);
}
 
ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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PostPosted: Mon Feb 08, 2010 4:39 pm     Reply with quote
PCWHD 1.104 with dspic30f4013.

Your code return me a lot of garbage chars.

In fact I've tested with an uint8 same thing! (I don't know if it's a problem with PCD, i can't test with a anything else i'm out of PIC except dspics)

What could be the other alternative for inserting a dot when displaying value.

It's just a matter of putting the decimal at the right place.

I think if it's possible to read the int32 and on the last field insert a dot in between (from 99999 example value) this would result in 9999.9 being displayed

Thank you very much for you help Smile

EDIT: i thought dividing 10 the value but this would require to have a float variable which i would like to avoid if possible ?
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 08, 2010 5:06 pm     Reply with quote
Quote:

I can't test with anything else.

You can test other PICs in the MPLAB Simulator, using the "UART1"
feature (of MPLAB) to display text in the Output Window:
http://www.ccsinfo.com/forum/viewtopic.php?t=23408&start=1
ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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PostPosted: Mon Feb 08, 2010 7:04 pm     Reply with quote
Hi,

Your code run well in MPLAB SIM

but this doesn't:


Code:


#include <30f4013.h>
#FUSES FRC_PLL16,PR_PLL,NOWDT,NOPUT,NOMCLR,NOBROWNOUT

#use delay(clock=117920000)
#use rs232(baud=9600, UART1, ERRORS)

void main(void)
{
int32 value;

value = 999999;

printf("%4.2w", value);

while(1);
}


it crash during execution (but compiling is successful) and SIM UART1 Tab is empty no output from serial



hmmm i don't have any clue why it doesn't work even with simulation


thanks!
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Feb 09, 2010 2:24 am     Reply with quote
You could do a work-around for the %w format, by using using division
and the modulo operator to calculate the quotient and the remainder.
Then just display the quotient and the remainder in one printf statement,
with a '.' between the format specifiers for each one.

But first, you need to see how the PCD compiler handles the sign of
the result of the modulo (%) operator. In PCH, the result is always
positive. But CCS may follow a different standard (C99 ?) in PCD.
Change the program below for the 30f4013 and see what you get
for the remainder. Is it a negative or a positive number ?
Code:

#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//======================================
void main(void)
{
signed int32 dividend;
signed int32 remainder;
signed int32 quotient;

//dividend = 999999;
dividend = -123456;

quotient = dividend / 100;
remainder = dividend % 100;

printf("quotient = %ld\r", quotient);
printf("remainder = %ld\r", remainder);

while(1);
}
 
ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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PostPosted: Wed Feb 10, 2010 7:33 pm     Reply with quote
Dear PCM programmer,

Sorry for the late reply, here's the output of your code from the dspic.

Quote:

quotient = -1234
remainder = 56


Nice quick fix Smile

I know it's not the best way (I've never use so much dirty workaround in programming ) to do it but it works !

If only PCD was less buggy and more mature like his brothers PCB,PCH and PCM

Best wishes
_________________
Regards,
Laurent

-----------
Here's my first visual theme for the CCS C Compiler. Enjoy!
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