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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 1.3 H
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut13H-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut13H-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut13H-nutos-4.8.0.zip '''Binaries''']
|-
| Ethernut 2.1 B
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut21B-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut21B-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut21B-nutos-4.8.0.zip '''Binaries''']
|-
| Ethernut 3.0 E
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut30E-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut30E-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-enut30E-nutos-4.8.0.zip '''Binaries''']
|-
| EIR 1.0 C
|
| Configuration Error.
| Configuration Error.
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/network-configuration-hard-coded-eir1c-nutos-4.8.0.zip '''Binaries''']
|-
| id="compilertd" colspan="5" |'''Compiler:''' ARM-GCC 4.2.2 ; AVR-GCC 4.3.0
|}

== Description ==

The most simple way is to use hard coded configuration values in your application. This will work for any environment, but changing the configuration requires to re-compile the code.

== Source Code ==

<source lang="c">
#include <dev/board.h>
#include <sys/timer.h>

#include <stdint.h>
#include <stdio.h>
#include <io.h>
#include <arpa/inet.h>

/* Hard coded network configuration. */
#define MY_MAC { 0x00, 0x06, 0x98, 0x30, 0x02, 0x76 }
#define MY_IP "192.168.192.111"
#define MY_MASK "255.255.255.0"

int main(void)
{
u_long baud = 115200;
uint8_t mac[6] = MY_MAC;
uint32_t ip_addr = inet_addr(MY_IP);
uint32_t ip_mask = inet_addr(MY_MASK);

/* Assign stdout to the DEBUG device. */
NutRegisterDevice(&DEV_DEBUG, 0, 0);
freopen(DEV_DEBUG_NAME, "w", stdout);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);
puts("Network Configuration Sample 1");

/* Register Ethernet controller. */
if (NutRegisterDevice(&DEV_ETHER, 0, 0)) {
puts("Registering " DEV_ETHER_NAME " failed.");
}
/* Configure network. */
else if (NutNetIfConfig(DEV_ETHER_NAME, mac, ip_addr, ip_mask)) {
puts("Configuring " DEV_ETHER_NAME " failed.");
}
/* Done. */
else {
puts("Now try 'ping " MY_IP "' on your PC.");
}

for (;;) {
NutSleep(1000);
}

return 0;
}
</source>

== Details ==

We use pre-processor macros to define the configuration values. They are located on top of the code, directly following the header includes. This makes it easier to find them for later modification.

<source lang="c">
#define MY_MAC { 0x00, 0x06, 0x98, 0x30, 0x02, 0x76 }
#define MY_IP "192.168.192.111"
#define MY_MASK "255.255.255.0"
</source>

Before configuring the network interface, we must first register the device.

<source lang="c">
if (NutRegisterDevice(&DEV_ETHER, 0, 0)) {
puts("Registering " DEV_ETHER_NAME " failed.");
}
</source>

Finally the network interface is configured by calling NutNetIfConfig. When this function returns 0, then the interface is up and running.

<source lang="c">
if (NutNetIfConfig(DEV_ETHER_NAME, mac, ip_addr, ip_mask)) {
puts("Configuring " DEV_ETHER_NAME " failed.");
}
</source>

We can now use ping from any PC in our network to check the configuration.

== See also ==
* [[Network Configuration]] Overview
** [[Network Configuration Using Stored Configuration]]
** [[Network Configuration Using a Configuration Editor]]
** [[Discovery Service]]
* [[Basic TCP Server]]
* [[Basic TCP Client]]
* More [[Nut/OS Examples]]

= External Links =

[http://en.wikipedia.org/wiki/Mac_address MAC address] A Media Access Control address (MAC address) is a unique identifier assigned to network adapters for identification.

[http://en.wikipedia.org/wiki/Ip_address IP address] A numerical identification that is assigned to devices participating in a computer network utilizing the Internet Protocol.

[http://en.wikipedia.org/wiki/Dhcp Dynamic Host Configuration Protocol] A protocol used by networked devices to obtain the parameters necessary for operation in an Internet Protocol network.

[[Category:Code Snippets]]

{{Languages}}

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