MQX Software SolutionsのトピックRe: writing data using MSFS

writing data using MSFS

bonzo — Tue, 22 Sep 2009 07:37:19 GMT

Got the MSFS file RAMDISK demo running. Using the shell, I can write to a file. If I specify 6 bytes, and read it back, I get "012345".

Now I want to write my own data using MSFS. How do I do this? Do I use a printf? Or _io_write? How do I convert the numbers? Do I use the standard conversion specifier like you would in a printf/fprintf (e.g. d, f, x, etc)

Thanks,

Re: writing data using MSFS

EAI — Tue, 22 Sep 2009 19:25:57 GMT

Yes to all of your questions.

You can use _io_write (or write) to write binary or untranslated text data to the file.

You can use the formatted I/O functions (fprintf, etc) to write test to a file. An you can use the standard conversion specifiers.

Look at logging_task.c in the hvac demo for a simple example using write.

Re: writing data using MSFS

javax — Tue, 21 Sep 2010 23:04:33 GMT

Hello

I have goot running mfs_sdcard_twrmcf51cn128 demo. I have been testing all commands. Whe I try "write" command,

parameters <seek_mode> and <offset> seem to have no effect. Any try a do, I got some thing like:

01010123456789...@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz0123456789:;<=>?@ABCDEFGH01234ÿ..........

Could be this a bug? or am I making some mistake?

I´ll appreciate any help

Re: writing data using MSFS

javax — Wed, 22 Sep 2010 05:16:08 GMT

Hello

Looking at file:

C:\ProgramFiles\Freescale\Freescale MQX 3.6\shell\source\mfs\sh_write.c

I founf these lines

// generate data to buf
               for (i = 0, c = '0', bi = 0; i < count;i++) {

                  buf[bi++] = c;

                  if (bi > SHELL_BLOCK_SIZE - 1) {
                     write(fd, buf, SHELL_BLOCK_SIZE);
                     bi = 0;
                  }

                  if (c == 'z')
                     c='0';
                  else
                     c++;
               }

third parameter(offset) is not taken into account when data is generate. After figuring out this code , command "write" could be inproved by user. It is important that any addition you come up with to keep function reentrance feature.

Thanks.

Re: writing data using MSFS

JuroV — Mon, 18 Oct 2010 16:58:47 GMT

Hello, I did not understand your last comment. Are you reporting a bug / improvement?