Other Parts Discussed in Thread: MSP430F5438A
Hello,
the subject: printf () is incorrect, also printf () of float is incorrect. why??
==================================================
I'm using with the msp430f5438A.
and i encounter with printing problem,
especially when the program print float number.
the environment
IDE: CCS 5.3.
compiler version : TI v4.1.2
output format: eabi (ELF).
lib: rts430x_sc_sd_eabi.lib ( from the map file)
using jtag: MSP-FET430UIF
CCs is full version licensed.
the compiler option:
--------------------
-vmspx --abi=eabi --code_model=small --data_model=small
-g --include_path="C:/ti/ccsv5/ccs_base/msp430/include"
--include_path="C:/ti/ccsv5/tools/compiler/msp430_4.1.2/include"
--include_path="H:/Workplace/ImpTest/impT1/hdr"
--include_path="H:/Workplace/ImpTest/impT1/hdr"
--advice:power="all" --define=__MSP430F5438A__
--diag_warning=225 --display_error_number --diag_wrap=off
--silicon_errata=CPU21 --silicon_errata=CPU22 --silicon_errata=CPU23
--silicon_errata=CPU40 --printf_support=full
the linker option:
-----------------
-vmspx --abi=eabi --code_model=small --data_model=small -g
--advice:power="all" --define=__MSP430F5438A__ --diag_warning=225
--display_error_number --diag_wrap=off --silicon_errata=CPU21
--silicon_errata=CPU22 --silicon_errata=CPU23 --silicon_errata=CPU40
--printf_support=full -z --stack_size=1024 -m"impV1.map" --heap_size=1024
--use_hw_mpy=F5 -i"C:/ti/ccsv5/ccs_base/msp430/include"
-i"C:/ti/ccsv5/tools/compiler/msp430_4.1.2/lib"
-i"C:/ti/ccsv5/tools/compiler/msp430_4.1.2/include"
--reread_libs --warn_sections --display_error_number --diag_wrap=off --rom_model
option ( that i sign):
--------------------------
i also follow all the instruction how to use printf().
hence, i sigh the check box:
properties->Debug->enable CIO function use
i start with program 1 with simple printf.
and the printing was incorrect.
===========================================================================
*** example: program 1 : check regular( no float) printf to the console***
===========================================================================
#include <stdio.h>
void main()
{
printf("this line suppose to be printed just once\n");
while (1)
{
printf("infinite message: Hello world!\n");
}
}
result (that was printed to the console):
==========================================
infinite message: Hello world!
infinite message: Hello world!
this line suppose to be printed just once
infinite message: Hello world!
infinite message: Hello world!
infinite message: Hello world!
this line suppose to be printed just once
infinite message: Hello world!
infinite message: Hello world!
=================================
the question #1 is:
----------------
1. the message that supposed to be printed just once,
is printed periodically.
why??
================================================================
*** example: program 2 : check float printf ( to console) ***
================================================================
#include <stdio.h>
float fnum = 1.3;
void main()
{
fnum = 1.9;
printf("print once: fnum = %f\n",fnum);
while (1)
{
printf("infinite printing: fnum = %f\n",fnum);
}
}
result:
==========
nothing is printed.
question #2 is:
----------------
what is worng with float printing??
============================================================
*** example: program 3 : check regular sprintf to buffer **
============================================================
in order to eliminate the effects of rtdx
i print the messages to buffer
#include <stdio.h>
#include <string.h>
#define SIZE 120
char buf[SIZE];
int cnt = 5;
const char *str[] = {"start\n",
"infinite printing\n",
"END\n"};
int i = 0;
void main()
{
sprintf(&buf[0], str[0]);
i += strlen (str[0]);
if (i > SIZE)
{
i = 0;
}
while (cnt--)
{
sprintf(&buf[i], str[1]);
i += strlen (str[1]);
if (i > SIZE-20)
{
i = 0;
}
}
sprintf(&buf[i], str[2]);
if (i > SIZE-20)
{
i = 0;
}
while (1)
{;}
return;
}
the result:
the buffer look fine.
all the strings were printed correctly
===============================================================
*** example: program 4 : check sprintf of float into buffer **
===============================================================
now , i add the the previous program float printing.
#include <stdio.h>
#include <string.h>
#define SIZE 120
char buf[SIZE];
int cnt = 5;
float fnum = 1.3;
const char *str[] = {"start, %f\n",
"infinite printing %f\n",
"END %f\n"};
int i = 0;
void main()
{
fnum = 1.9;
sprintf(&buf[0], str[0], fnum);
i += strlen (str[0]);
if (i > SIZE)
{
i = 0;
}
while (cnt--)
{
sprintf(&buf[i], str[1], fnum);
i += strlen (str[1]);
if (i > SIZE-20)
{
i = 0;
}
}
sprintf(&buf[i], str[2], fnum);
if (i > SIZE-20)
{
i = 0;
}
while (1)
{;}
return;
}
the result:
----------
the printing was wrong.
except the first string ("start") . nothing
was printing. no float and no other strings.
so , it's obvious the the rtdx is not the reason to the
printing malfunction.
question #3 is:
----------------
3. what get wrong with the float printing?
thanks.
