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Ada Embedded Network Stack

This library is a modular network stack that implements ARP, IPv4, UDP, DNS, and DHCP protocols on top of an Ethernet driver. It is divided into two parts: a hardware-independent core and a specific driver for STM32F7xx and STM32F4xx boards. This allows you to provide IPv4 network access to your project with ease. The library is utilized by the EtherScope project to capture and analyze network traffic (See https://github.com/stcarrez/etherscope).

The following protocols are supported:

IPv4 (RFC 791)
ICMP (RFC 792)
UDP (RFC 768)
ARP (RFC 826)
DNS (RFC 1035)
DHCPv4 (RFC 2131)
NTP (RFC 5905)

Installation and Usage

The core part has no dependencies, while the STM32 driver depends on the ethernet crate, as it implements the MDIO interface defined there.

To use the library with Alire just run alr with enet (for the core part). To use the STM32 driver run alr with enet_stm32.

See more details on the Wiki.

Examples

We provide a simple ping_text_io demo. This demo is independent of any particular board, and you can build it by providing the required runtime, for example:

alr -C demos/ping_text_io/ build -- -XRUNTIME=embedded-stm32f746disco

When you flash the executable, the board will receive an IP address via DHCP and ping the default gateway. You can see the ping messages emitted using the standard Ada.Text_IO routines.

Four additional demo applications are provided to illustrate how you can use the different network features. They require an STM32F429, STM32F746, or STM32F769 Discovery board to run. These examples depend on the Ada_Drivers_Library and do not use Alire for building. Instead, make sure you have the GNAT ARM cross toolchain in your PATH, then run:

configure --with-board=stm32f746 # or stm32f769 or stm32f429

Then, execute make checkout to download the necessary dependencies. Finally, make all will build all four demos.

The demo applications use the DHCP Client to get an IPv4 address and obtain the default gateway and DNS.

For some demo applications, you can switch to a static IP configuration by editing the file demos/utils/demo.adb and un-comment and modify the following lines:

   Ifnet.Ip := (192, 168, 1, 2);
   Ifnet.Gateway := (192, 168, 1, 240);
   Ifnet.Dns := (192, 168, 1, 240);

and disable the DHCP configuration by commenting the line:

   -- Dhcp.Initialize (Ifnet'Access);

Ping

The ping application implements a simple ping on several hosts and displays the ping counters on the STM32F LCD display. The application will also answer to ping requests.

To build the Ping application you may run:

  make ping

And to flash the ping image, you can use:

  make flash-ping

Echo

The echo application shows a simple UDP server that echos the received packet (RFC 862). It listens on UDP port 7, loops to wait for UDP packets, returns them and increment a counter of received packets which is displayed on the STM32 LCD display. The echo application is described in the article: Simple UDP Echo Server on STM32F746

To build the Echo application you may run:

  make echo

And to flash the echo image, you can use:

  make flash-echo

And to test the echo UDP server, you may use the socat command on GNU/Linux. For example:

  echo -n 'Hello! Ada is great!' | socat - UDP:192.168.1.156:7

DNS

The dns application shows a simple DNS client resolver that queries a DNS to resolve a list of hosts.

To build the dns application you may run:

  make dns

And to flash the dns image, you can use:

  make flash-dns

Time

The time application uses the NTP client to retrieve the GMT date from a NTP server and it displays the GMT time as soon as the NTP synchronisation is obtained. The application will also answer to ping requests.

To build the Time application you may run:

  make time

And to flash the time image, you can use:

  make flash-time