Introduction

The Mizar32 has an add-on hardware module which lets us connect the Mizar32 to the internet.

Hardware view

The Ethernet add-on module is a half-width board which plugs into the left half of the add-on bus connectors, BUS1, BUS2 and BUS3. The hardware module converts the ethernet signals provided by the AVR32UC3A chip into the voltage levels required on an RJ45 connector to connect it to a hub, switch or router.

The board houses a DP83848 Ethernet transceiver, which generates and receives the raw ethernet signals and communicates their contents to the AVR32UC3 on the main board using the RMII protocol, which reduces the number of bus pins necessary to achieve this.

Software view

Alcor6L has a net module which lets you make TCP connections to other computer and receive incoming TCP connections from them, send and receive data and disconnect.

The following example waits for an incoming connection on port 23, then receives data from the network and prints it on console.

In eLua:

-- wait for an incoming connection on the TELNET port
socket, remote, err = net.accept( 23 )
if err ~= net.ERR_OK then
  print( "Error waiting for connection" )
else
  -- print all lines of data until they close the connection
  repeat
    res, err = net.recv( socket, "*l" )  -- That's *L not *One
    if err ~= net.ERR_OK then
      print( res )
    end
  until err ~= net.ERR_OK
end
net.close( socket )

If the Ethernet hardware is not present, its bus pins can be used as as generic PIO pins by calling pio.pin.setdir(). For example, to use BUS1 pin 6 as a PIO output, you could use:

 pio.pin.setdir(pio.OUTPUT, pio.PB_3)

In PicoLisp:

Please note: Alcor6L doesn't have the Ethernet module for PicoLisp yet. We're working on it. It will be supported soon. Please see issue #10

Further reading

• The eLua Reference Manual's page for the net module
• The Atmel AVR32UC3A datasheet, section 29: Ethernet MAC
• The DP84838I transceiver datasheet