Harald: 1 revision imported

2016-10-27T16:03:02Z

1 revision imported

Daniel: /* Test Environments */

2009-03-10T17:42:08Z

‎Test Environments

New page

== Test Environments ==

{| class="smalldiv"
| style="background-color:#F6F9ED" |
| style="background-color:#F6F9ED" | Hardware Comments
| style="background-color:#F6F9ED" | '''Nut/OS 4.6.4'''
| style="background-color:#F6F9ED" | '''Nut/OS 4.7.4'''
| style="background-color:#F6F9ED" | '''Nut/OS 4.8.0'''
|-
| Ethernut 3.0 E
|
| Compiler Error
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/write-phat-enut30E-nutos-4.7.4.zip '''Binaries''']
| NO
|-
| EIR 1.0 C
|
| Compiler Error
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/write-phat-EIR1C-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/write-phat-EIR1C-nutos-4.8.0.zip '''Binaries''']
|-
| AT91SAM7X-EK
|
| NT
| NT
|-
| AT91SAM9260-EK
|
| NT
| NT
|-
| id="compilertd" colspan="5" |'''Compiler:''' ARM-GCC 4.2.2 ; AVR-GCC 4.3.0
|}

== Description ==

This example demonstrates how to write a file with the PHAT file system to a MMC (SD) card.

== Prerequisites ==

[[Image:Eir10c-mmc-config.png|thumb|right|EIR 1.0 MMC configuration]]

When using the EIR 1.0 board, make sure, that the option of the ''MMC Software SPI 0 Driver'' are configured as shown in the screen shot.

== Source Code ==
<source lang="c">
#include <dev/board.h>
#include <fs/phatfs.h>
#include <stdio.h>
#include <io.h>
#include <fcntl.h>

int main (void)
{
int hvol;
FILE *fp;

NutRegisterDevice(&devPhat0, 0, 0);
NutRegisterDevice(&DEV_MMCARD, 0, 0);

hvol = _open(DEV_MMCARD_NAME ":1/PHAT0", _O_RDWR | _O_BINARY);

fp = fopen("PHAT0:/TEST.TXT", "w");
fprintf(fp, "HelloFile");
fclose(fp);

_close(hvol);

for(;;);
}
</source>

== Details ==

<source lang="c">
int hvol;
FILE *fp;
</source>

Variable <code>hvol</code> is used for the volume handle and variable <code>fp</code> will contain the file pointer.

We must register all devices that we will use. Here it's <code>DEV_MMCARD</code> for the MultiMedia Card device and <code>devPhat0</code> for the file system driver.

<source lang="c">
NutRegisterDevice(&DEV_MMCARD, 0, 0);
NutRegisterDevice(&devPhat0, 0, 0);
</source>

To mount the volume, we open the MMC device.

<source lang="c">
hvol = _open(DEV_MMCARD_NAME ":1/PHAT0", _O_RDWR | _O_BINARY);
</source>

Note, that the name contains the device name, followed by a colon, followed by the number of the partition, followed by a slash, followed by the name of the file system driver.

The name of the MMC driver may differ among target boards. <code>DEV_MMCARD_NAME</code> is defined in <code>board.h</code> and represents the standard name of the specific target board.

Now we can open a file for writing, write some text into the file and close the file, using the standard C stream functions <code>fopen</code>, <code>fprintf</code> and <code>fclose</code>.

<source lang="c">
fp = fopen("PHAT0:/TEST.TXT", "w");
fprintf(fp, "HelloFile");
fclose(fp);
</source>

Finally, the partition gets unmounted by

<source lang="c">
_close(hvol);
</source>

== See also ==
* [[Reading PHAT Files]]
* [[Reading PHAT Directories]]
* More [[Nut/OS Examples]]

== External Links ==

[http://en.wikipedia.org/wiki/Fopen C file input/output] The C programming language provides many standard library functions for file input and output.

[http://en.wikipedia.org/wiki/File_Allocation_Table File Allocation Table] A computer file system architecture originally developed by Bill Gates and Marc McDonald.

[[Category:Code Snippets]]

{{Languages}}

← Older revision	Revision as of 16:03, 27 October 2016
(No difference)

Writing PHAT Files - Revision history

Harald: 1 revision imported

Daniel: /* Test Environments */