Harald: 1 revision imported

2016-10-27T16:03:00Z

1 revision imported

Daniel: /* Test Environments */

2009-03-10T17:42:37Z

‎Test Environments

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== 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/read-phat-enut30E-nutos-4.7.4.zip '''Binaries''']
| NO
|-
| EIR 1.0 C
| Set jumper JP1 to DEBUG mode.
| Compiler Error
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/read-phat-EIR1C-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/read-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 reada file with the PHAT file system from a MMC (SD) card.

Note, that this example is consecutive to [[Writing PHAT Files]]. We will read a file, previously written by that example.

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

char buff[256];

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

unsigned long baud = 115200;

NutRegisterDevice(&DEV_DEBUG, 0, 0);

freopen(DEV_DEBUG_NAME, "w", stdout);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);

puts("File read test\n");

if (NutRegisterDevice(&devPhat0, 0, 0)){
printf("PHAT file system error\n");
}

if (NutRegisterDevice(&DEV_MMCARD, 0, 0)){
printf("MMC block device error\n");
}

hvol = _open("MMC0:1/PHAT0", _O_RDWR | _O_BINARY);

if (hvol == -1) {
printf("Mount error %d\n", errno);
}

fp = fopen("PHAT0:/TEST.TXT", "r");
fscanf(fp, "%s", &buff[0]);
puts(buff);

fclose(fp);
_close(hvol);

for(;;);
}
</source>

== Details ==

<source lang="c">
char buff[256];
</source>

defines an array of the type char of 256 bytes. An char array is also called string.

<source lang="c">
unsigned long baud = 115200;

NutRegisterDevice(&DEV_DEBUG, 0, 0);

freopen(DEV_DEBUG_NAME, "w", stdout);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);

puts("File read test\n");
</source>

After setting our stout and printing out a banner,

<source lang="c">
if (NutRegisterDevice(&devPhat0, 0, 0)){
printf("PHAT file system error\n");
}
</source>

registers the PHAT file system and prints out an error message, if an error occured.

<source lang="c">
if (NutRegisterDevice(&DEV_MMCARD, 0, 0)){
printf("MMC block device error\n");
}
</source>

registers the MMC block device and prints out an error message, if an error occured.

<source lang="c">
hvol = _open("MMC0:1/PHAT0", _O_RDWR | _O_BINARY);
</source>

mounts a PHAT partition called "<code>PHAT 0</code>".

<source lang="c">
if (hvol == -1) {
printf("Mount error %d\n", errno);
}
</source>

prints out an error message, if an error occured mounting the partition.

<source lang="c">
fp = fopen("PHAT0:/test.txt", "r");
</source>

opens a file "test.txt" and prepares it to be read. Now the pointer <code>fp</code> points to that text file.

<source lang="c">
fscanf(fp, "%s", &buff[0]);
</source>

reads the string (<code>&s</code>) in the file, <code>fp</code> points to, and puts it into the "<code>buff</code>" array.

<source lang="c">
puts(buff);
</source>

puts out the content of <code>buff</code>, namely the string read from the text file.

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

Finally, we close the file and unmount the partition.

== Output ==

File read test 
HelloFile

== See also ==
* [[Writing PHAT Files]]
* [[Reading PHAT Directories]]
* [[MMC MP3 Player]]
* More [[Nut/OS Examples]]

[[Category:Code Snippets]]

{{Languages}}

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