[En-Nut-Discussion] Nut/OS in STK300

[Harald Kipp]

Hi Janne,


>Any hints what do I need to change in order to get UART to work in
>STK300 meaning in ATMega103 generally ?
>
>Is it necessary to enable this flag for example? (STK300 is 4MHz)
>DEFS = -DNUT_CPU_FREQ=3686400

This definition is only required if the 32kHz crystal is not
mounted.

>I saw some comment in sources about this being for 1ms resolution
>enable, but what if it is not defined ? Does it make timers&rtc still to
>work but with worse resolution ?

If NUT_CPU_FREQ is not defined, the resolution is 62.5 ms,
using the 32 kHz crystal. Taking this as a reference, Ethernut
is able to determine its main crystal frequency.


>Currently app/threads works nicely with 3 different threads blinking
>leds with specific speed defined differetnly for each threads. However,
>LCD and UART shows random rubbish only ...

For LCD it may be a hardware timing problem. For the
UART, check the baudrate table in the ATmega datasheet,
specially the deviation.


>I set nutconf to stk200 and atmega103. Whatever stk200 then defines, I
>have no idea.

The STK200 defines the type of programming adapter you're
using. This definition enables to simply call

   make burn

on the command line.

Harald