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How does %w work?

 
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dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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How does %w work?
PostPosted: Fri Apr 05, 2019 12:22 pm     Reply with quote
I'm using the PIC24FJ128GA204 on Microchip's PIC24 Curiosity dev kit along with CCS PCD 5.082.

I saw a post by Ttelmah a while ago suggesting somebody use the %w format specifier with int32's to avoid using floats.

However, when I try to use it, I get seemingly nonsensical output, with numbers that don't match up.

For example, here is my main function:
Code:
int main(void)
{
    uint32_t test1 = 18;
    uint32_t test2 = 123;
    uint32_t test3 = 554;
   
    delay_ms(100);
   
    fprintf(PC, "\r\n\r\n");
    fprintf(PC, "test1: %1.3w\r\n", test1);
    fprintf(PC, "test2: %1.3w\r\n", test2);
    fprintf(PC, "test3: %1.3w\r\n", test3);
   
    while(1){}

    return 0;
}


The code gives this output on my serial port:
Code:
test1: 0.040                                                     
test2: 0.150
test3: 0.5=0


I have tried plain int32 instead of uint32_t, int16, and different numbers, but I can't notice any pattern at all.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 05, 2019 1:14 pm     Reply with quote
I compiled the program below with CCS vs. 5.082, and ran it in the
MPLAB vs. 8.92 simulator. I got this in the output window:
Quote:

test1: 0.018
test2: 0.123
test3: 0.554

Test program:
Code:
#include <18F46K22.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, NOPBADEN
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS, stream=PC)

#include <stdint.h>

//==========================
void main()
{
uint32_t test1 = 18;
uint32_t test2 = 123;
uint32_t test3 = 554;
   
delay_ms(100);
   
fprintf(PC, "\r\n\r\n");
fprintf(PC, "test1: %1.3w\r\n", test1);
fprintf(PC, "test2: %1.3w\r\n", test2);
fprintf(PC, "test3: %1.3w\r\n", test3);
   
while(TRUE);
}   
dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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PostPosted: Fri Apr 05, 2019 1:18 pm     Reply with quote
Yeah that's what I expected to see.

I just found this super old thread talking about %w giving garbage when using PCD.
https://www.ccsinfo.com/forum/viewtopic.php?p=128178

That's a 9-year old thread though. I wonder if it's still messed up maybe :/

Perhaps it is ok when you are using PCH. However, I don't have any other PICs to test it out with at the moment.

Also, I am 99.99999% sure that my UART is set up properly. I have been using this similar setup for a long time now, and anything other than %w works.

Last edited by dluu13 on Fri Apr 05, 2019 1:25 pm; edited 1 time in total
gaugeguy



Joined: 05 Apr 2011
Posts: 296

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PostPosted: Fri Apr 05, 2019 1:25 pm     Reply with quote
Try using %4.3w
The first number should be the total number of digits.
dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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PostPosted: Fri Apr 05, 2019 1:30 pm     Reply with quote
I have tried various numbers for the first digit. I actually started with %5.2w.

%lw and %w both give the same results.

In this case, %4.3w gives exactly the same result as %1.3w. There must be a pattern, since I get the same result every single time.

Also, as I understand, the first number is the minimum width of the field, and if the number is larger, then the field will grow to fit it.

I'm wondering if it is a compiler bug, since an older user using PCD also had the same issue. I will email CCS and mention here if I get any results.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 05, 2019 1:50 pm     Reply with quote
Here are the relevant compiler updates by date and compiler version:

Oct. 2015 -- 5.050 Fixed a bug when negative number were used with %W on 24 bit parts
Mar. 2015 -- 5.044 Corrected a formatting issue in %W (%LU, %LD should not have been affected)
Feb. 2015 -- 5.041 A problem with %w where if the digit after the . was 0 it did not output on the PIC24 is fixed
Jan. 2015 -- 5.037 The PIC24 printf() %w no longer forces the leading zeros
Nov. 2014 -- 5.031 Fixed a PIC24 bug in %w when used with signed numbers
dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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PostPosted: Fri Apr 05, 2019 2:16 pm     Reply with quote
Unfortunately it looks like I am still having problems haha

I just tested on a PIC24FJ128GA308 and I am having the exact same output as the PIC24FJ128GA204.

Anyway, I am talking with CCS support now, and I have just sent over an LST file so hopefully we get to the bottom of this.
dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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PostPosted: Mon Apr 08, 2019 1:44 pm     Reply with quote
Update:

I guess it was something with a compiler bug on PCD v5.082, seeing as how PCMP got it to work with PCH.

CCS support emailed me a couple of files to patch things up and it seems to work as expected now.
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