[En-Nut-Discussion] nut/os and own design hardware

[Uwe Bonnes]

>>>>> "Ole" == Ole Reinhardt <ole.reinhardt at embedded-it.de> writes:

    Ole> Hi!
    >> I have made my own board with AT90CAN128 and some Bluetooth module on
    >> it.  Bluetooth is connected to UART1 and I also need to use CAN
    >> controller build inside MCU. Because of BT module I need to run this
    >> HW with 3.3V VCC and max 8.00MHz clock. There is no extra SRAM on my
    >> board... =( [...]  What you think, is it possible do those things
    >> with Nut/OS and without extra SRAM? First one I guest yes but second
    >> one may be difficult, even impossible?

    Ole> Indeed it _is_ possible to run NutOS on such a limitated system,
    Ole> but without much usage for you. You will be able to run a single,
    Ole> perhaps two threads with very limited stack size and not much
    Ole> possebility to allocate any extra heap space. The AT90CAN128 has
    Ole> about 4K of ram, which is very small for a NutOS system. If you
    Ole> plan to use the networking layer you even won't be able to run you
    Ole> system without any external ram.  Just a single Ethernet packet may
    Ole> be up to 1.5k large.

    >> Also how I make config file for my board to use with Nut/OS Configure
    >> Tool?  Haven't find any document about config file structure and
    >> commands to use.

    Ole> Just start Nutconf and start with the ethernut 1.3f config file for
    Ole> example. Next change the cpu type, disable networking and other
    Ole> drivers you don't need, disable external ram usage and save the
    Ole> resulting file as you own config file.

I use NUT-OS on an AT90CAN128 without external ram to build CAN bus
controlled power supplies.

But if space allows, anybody should add external RAM to their boards. It
makes life much esier... 
-- 
Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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