Ethernut 1 AVR Ethernet Microcontoller Board
Ethernut 1.3 is a low-cost microcontroller board with Ethernet, open source RTOS & TCP/IP stack and embedded web server. It is based on the Atmel ATmega128 AVR RISC MCU and the RTL8019AS 10 Mbit/s Ethernet controller.
- ATmega 128 8-bit RISC microcontroller with up to 16 MIPS throughput.
- Full duplex IEEE 802.3 compliant 10 Mbps Ethernet controller with on-board RJ-45 connector.
- Two serial ports, one RS232 at DB-9 connector.
- 128 kByte in-system programmable Flash ROM.
- 4 kByte in-system programmable EEPROM.
- 32 kByte external SRAM.
- 22 programmable digital I/O lines.
- 8-channel, 10-bit analog/digital converter.
- Two 8-bit and two 16-bit timers/counters.
- Watchdog timer for enhanced reliability.
- LED indicators for power supply and Ethernet activity.
- Single power supply DC 8-12V.
- Board size: 78 x 98 mm (3.1" x 3.9").
Application Development
Applications are developed in the C programming language with the choice of
either the free AVR-GCC compiler on Linux and Windows development hosts
or the commercial ICCV7 compiler from ImageCraft.
Nut/OS' architecture has been focused on portable standards.
Developers with experience in C programming and TCP/IP applications for
the PC will soon feel confident. Existing software can be adapted
for Nut/OS with minimal effort. The following example prints a message on
the second serial port:
#include <stdio.h>
#include <dev/uartavr.h>
int main(void)
{
FILE *ser1;
NutRegisterDevice(&devUart1, 0, 0);
ser1 = fopen("uart1", "r+b");
fprintf(ser1, "Hello world!\n");
}
The Nut/OS operating system offers a feature rich API including
Multi-threading,
Device Driver,
Stream I/O,
Dynamic Memory,
Timer,
Events,
Socket API and
TCP/IP Protocols.
At the same time Nut/OS is a very lean OS which is well suited for
microcontroller CPUs and their small memory footprint. Typically more
than 100 KB program space and 20 KB data memory are available for your
application.
Nut/OS can be used in commercial products for any purpose without licence fees
(the full BSD-style license is here).
Nut/OS comes with several sample applications, including an
embedded web server and a
RS-232 to Ethernet gateway.
