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prayami
Joined: 22 Dec 2004
Posts: 78
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| sprintf problem.......... |
 Posted: Sun Apr 09, 2006 4:00 pm |
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Hi.....I have CCS PCH compiler version 3.235.23.16 . And I am using
18F4525 microcontroller. I tried the following program but non of the
PIN_D4 to PIN_D7 goes high.
This code is to save float value into to char array. And I tried to check
the position of the dot in that array but there is no dot in that array.
Is it bug...??
As per I understand...the following code ...
sprintf(input_str,"%01.2f",0.71);
should result like this...
input_str[0] = '1'
input_str[1] = '7'
input_str[2] = '.'
input_str[3] = '0'
input_str[4] = '\0'
But it is not like that.....................
| Code: |
#include <18F4525.h>
#fuses H4,NOWDT,NOLVP,NOBROWNOUT,NOPBADEN,PUT,NOXINST,NOMCLR,NOLPT1OSC
#use delay(clock=40000000)
char input_str[5];
void main() {
set_tris_d(0x00);
output_low(PIN_D4);
output_low(PIN_D5);
output_low(PIN_D6);
output_low(PIN_D7);
while(TRUE) {
sprintf(input_str,"%01.2f",0.71);
if( input_str[0] == '.' )
output_high(PIN_D4);
else
output_low(PIN_D4);
if( input_str[1] == '.' )
output_high(PIN_D5);
else
output_low(PIN_D5);
if( input_str[2] == '.' )
output_high(PIN_D6);
else
output_low(PIN_D6);
if( input_str[3] == '.' )
output_high(PIN_D7);
else
output_low(PIN_D7);
}//while(TRUE)
}//main
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Apr 09, 2006 4:31 pm |
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In your version of the compiler, in the printf (or sprintf) format statement,
the "width" specifier must be greater than the "precision" specifier.
See the changes I've made in bold below. If you make that change
then you get the proper output:
| Quote: | #include <18F4525.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
//=======================
void main()
{
char input_str[10];
sprintf(input_str,"%03.2f",0.71);
printf("string = %s\n\r", input_str);
while(1);
} |
In PCH vs. 3.249, your original code as posted, will work.
But with your older version, you have to do it like I've shown above. |
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