topic Re: Remove std_error_buff, CW 10.7, 56F8037 in CodeWarrior for MCU

Remove std_error_buff, CW 10.7, 56F8037

j___ — Tue, 03 Jul 2018 19:04:14 GMT

I generated a project for the 56F8037 with the CW 10.7 "New MCU Project" tool. It does NOT have an OS.

The generated project had support for console output with the following:

/* here we test the thinner console print */
/* printf is too large for MC56F8037 */
//#include "console.h"

//__ConsoleWrite(0,test_string,6);
//fflush_console();

I don't need the console (and it is too slow) so, I commented out those lines. However, I still see the following in the .xMap file:

000004B4 00000080 .bss    Fstderr_buff    (MSL C 56800E smm.lib ansi_files.o   )
00000534 00000080 .bss    Fstdout_buff    (MSL C 56800E smm.lib ansi_files.o   )
000005B4 00000080 .bss    Fstdin_buff (MSL C 56800E smm.lib ansi_files.o   )
00000634 00000001 .bss    Ferrno (MSL C 56800E smm.lib errno.o        )
00000635 00000001 .bss    F__dbg_io_ready (MSL C 56800E smm.lib hostio.o       )
00000636 00000001 .bss    FtxtbinFlag (MSL C 56800E smm.lib hostio.o       )

For example, stderr_buff is located at:

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Include\ansi_files.h

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\ansi_files.c

ansi_files.h is used in:

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Include\file_io.h

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\ansi_files.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\char_io.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\direct_io.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\file_io.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\file_pos.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\misc_io.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\wchar_io.c

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\wfile_io.c

How can I get rid of these buffers?

Fstderr_buff
Fstdout_buff
Fstdin_buff

These are using precious RAM that I need to recover.

Regards...

Re: Remove std_error_buff, CW 10.7, 56F8037

j___ — Tue, 03 Jul 2018 21:55:05 GMT

I looked at MSL C Reference Version 10, pages 20 & 21, under the paragraph "Configuring Console I/O". Here is an excerpt:

Console I/O for stdin, stdout, and stderr can be configured in many different ways. The easiest way to configure console I/O is to have it turned off completely. When _MSL_CONSOLE_SUPPORT is off, MSL does not know about stdin, stdout, or stderr. Calls such as printf() are not placed in the standard C library

Grepping through the MSL, the only place that _MSL_CONSOLE_SUPPORT is defined is in

"C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Include\ansi_parms.h".

Here is the pertinent code:

#if defined(_No_Console) && !defined(_MSL_CONSOLE_SUPPORT)
#define _MSL_CONSOLE_SUPPORT 0
#endif

#ifndef _MSL_CONSOLE_SUPPORT
#define _MSL_CONSOLE_SUPPORT 1
#endif

So, it looks like the documentation is a little behind because now the code keys off of "_No_Console" to disable the console.

Here is some history I found in the MSL comments:

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Include\console_io.h

/* Change record:
* ad 990128 Added #ifndef _No_Console */

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\assert.c

/* Change record:

* cc 020219 Redid the check for _No_Disk_File_OS_Support & _No_Console */

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common\Src\ansi_files.c

/* Change record:

* mm 980509 Removed static attribute so that it can be linked without error when _No_Console
* is defined. MW07076 */

C:\Freescale\CW MCU v10.7\MCU\M56800E Support\msl\MSL_C\MSL_Common_Embedded\Src\uart_console_io.c

#pragma ANSI_strict off /* _No_Console will be empty file */

So, I set _No_Console to 1 in the pre-defined symbols of the project properties and recompiled the libraries. Then I rebuilt my application. Unfortunately, the stdxxx_ buffers are still there.

stderr_buff   (MSL C 56800E smm.lib ansi_files.o   )
stdout_buff   (MSL C 56800E smm.lib ansi_files.o   )
stdin_buff   (MSL C 56800E smm.lib ansi_files.o   )

So, I'm still stuck.

How do I get the compiler to suppress generation of these buffers?

Regards...

Re: Remove std_error_buff, CW 10.7, 56F8037

ZhangJennie — Mon, 09 Jul 2018 08:47:40 GMT

Hi,

Can you please create a demo project and upload it here?

I will check it directly on it. Thanks for your cooperation.

Have a great day,
Jennie Zhang

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