Network Configuration Using Hard Coded Configuration

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Contents

Test Environments

Hardware
Comments 		Nut/OS
4.6.4 		Nut/OS
4.7.4 		Nut/OS
4.8.0
Ethernut 1.3 H OK
Binaries 		OK
Binaries 		OK
Binaries
Ethernut 2.1 B OK
Binaries 		OK
Binaries 		OK
Binaries
Ethernut 3.0 E OK
Binaries 		OK
Binaries 		OK
Binaries
EIR 1.0 C Configuration
Error. 		Configuration
Error. 		OK
Binaries
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 

#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;
}

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. 

#define MY_MAC  { 0x00, 0x06, 0x98, 0x30, 0x02, 0x76 }
#define MY_IP   "192.168.192.111"
#define MY_MASK "255.255.255.0"

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

if (NutRegisterDevice(&DEV_ETHER, 0, 0)) {
    puts("Registering " DEV_ETHER_NAME " failed.");
}

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

if (NutNetIfConfig(DEV_ETHER_NAME, mac, ip_addr, ip_mask)) {
    puts("Configuring " DEV_ETHER_NAME " failed.");
}

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

See also

External Links

MAC address A Media Access Control address (MAC address) is a unique identifier assigned to network adapters for identification.

IP address A numerical identification that is assigned to devices participating in a computer network utilizing the Internet Protocol.

Dynamic Host Configuration Protocol A protocol used by networked devices to obtain the parameters necessary for operation in an Internet Protocol network.

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