[fpc-devel] ENC28J60 Ethernet Controller AVR/ARM Driver

[Dimitrios Chr. Ioannidis]

Hi,

   I started to write a driver ( 
https://github.com/dioannidis/fp_ethernet_enc28j60.git ) for this chip ( 
ENC28J60 Ethernet Controller ) first for the AVR platform, ( heavily 
inspired from the UIPEthernet library ( 
https://github.com/UIPEthernet/UIPEthernet.git )) and I want to ask the 
community, of course, is there anyone that already done it ?

   My goal is to made the free pascal users able to use a very low cost 
solution Arduino Nano / UNO  development board with a ENC28J60 module 
for a little IoT ( and not only ) fun, learning e.t.c. ...

   I managed to configure the chip and the driver receives packets ( 
broadcast packets configured to allow only ARP ).

   Now, because I'm not embedded developer I'm thinking that I would 
need help / advices to take some decisions so here I am.

   First and more important, in the new FPC version, will the AVR 
platform review / resolve the following issues :

     "AVR - incorrect stack error checking" 
(https://bugs.freepascal.org/view.php?id=35332)
     "AVR - Assembler routines for 8, 16 & 32 bit unsigned div (code 
contribution)" ( https://bugs.freepascal.org/view.php?id=32103 )
     "AVR - invalid address used when evaluating a variable in gdb" ( 
https://bugs.freepascal.org/view.php?id=33914 )
     "AVR - Incorrect SPI clock rate bit constant names in some 
microcontroller units" ( https://bugs.freepascal.org/view.php?id=32339 )
     and add support for theavrxmega3 subarch, atmega 3208, 3209, 4808, 
4809 ( from Christo Crause's repository 
https://github.com/ccrause/freepascal.git ) ?

   Except from Laksen's ethernet stack ( 
https://github.com/Laksen/fp-ethernet.git ) is there other, more 
lightweight, ethernet stack library written in Object Pascal ?

   As I'm not a compiler guy, isthe "volatile" intrinsic supported in 
AVR platform ( I didn't find it in intrinsics unit ) ?

   In FPC embedded world/platforms, is the Object approach more SRAM 
hungry ( my tests are inconclusive ) from the procedure / function 
approach ?

   What's more embedded "friendly" ?

this :

interface

type
   TUART = Object
   private
     FBaudRate: DWord;
     function Divider: Integer;
   public
     procedure Init(const ABaudRate: DWord = 57600);
     procedure SendChar(c: char);
     function ReadChar: char;
     procedure SendString(s: ShortString);
     procedure SendStringLn(s: ShortString = '');
   end;

or this :

interface

   var
     FBaudRate: DWord;
     function Divider: Integer;
     procedure Init(const ABaudRate: DWord = 57600);
     procedure SendChar(c: char);
     function ReadChar: char;
     procedure SendString(s: ShortString);

     procedure SendStringLn(s: ShortString = '');


And of course anyone who wants to help is welcome .

regards,

-- 

Dimitrios Chr. Ioannidis

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