[En-Nut-Discussion] Create new platform

[BreeMatic]

Hello,

Some extra info :

RTOS Kernel -> Memory management -> Extended Memory Size

"Number of bytes available in external data memory.

The result of enabling this item is platform specific.With AVR systems 
it will enable the external memory interface of the CPU, even if the 
value is set to zero."

So it seems that disabling this (instead of set it to zero) will disable 
external memory  XMCRB
and release the pins

Otherwise you still have to do some custom board code in nutinit.c
and rebuild the OS

kind regards,

Rutger

Op 24-10-2010 16:50, rutger schreef:
> Hello,
>
> External Memory Control Register B -- XMCRB
> controls the pins of PORT C that will be released for normal use.
>
> I searched in the files and found it in nut\arch\avr\os\nutinit.c
>
> I'm not sure if the pins are released when NUTXMEM_SIZE  is changed to 0
> But maybe someone with more experience can tell this.
>
> When the pins are not released, maybe you can add code for it to nutinit.c
> (or in the main code) for your board.
>
> By the way the code you wrote will work on a atmega 128 with external memory
> and e.g. PORTE
>
> I'm just a beginner with NUT/OS, but maybe it's helpful
>
> kind regards,
>
> Rutger
>
>
> Op 24-10-2010 12:55, Micha? Gryko schreef:
>> Hi, I'm designing own platform as a student project. It's based on
>> ATmega 128. I want to use NutOS on it. Hardware is ready and I used
>> simple non NutOS app to test it. Here it is:
>>
>>    #include<avr/io.h>
>>
>>    // define what pins the LEDs are connected to.
>>
>>    #define LED PC0
>>    #define F_CPU 16000000
>>    // Some macros that make the code more readable
>>    #define output_low(port,pin) port&= ~(1<<pin)
>>    #define output_high(port,pin) port |= (1<<pin)
>>    #define set_input(portdir,pin) portdir&= ~(1<<pin)
>>    #define set_output(portdir,pin) portdir |= (1<<pin)
>>
>>    void delay_ms(uint8_t ms) {
>>     uint16_t delay_count = F_CPU / 17560;
>>     volatile uint16_t i;
>>
>>     while (ms != 0) {
>>        for (i=0; i != delay_count; i++);
>>        ms--;
>>      }
>>    }
>>
>>    int main(void) {
>>      set_output(DDRC, LED);
>>
>>      while (1) {
>>        output_high(PORTC, LED);
>>        delay_ms(200);
>>        output_low(PORTC, LED);
>>        delay_ms(200);
>> }
>> }
>>
>> It's working as intended (led blinks), but when I moved to NutOS with this:
>>
>> #include<sys/timer.h>
>>
>> int main(void)
>> {
>> 	sbi(DDRC, 0);
>> 	for(;;){
>> 		cbi(PORTC, 0);
>> 		NutSleep(500);
>> 		sbi(PORTC, 0);
>> 		NutSleep(500);
>> 	}
>> 	return 0;
>> }
>>
>> build is ok, target mcu is atmega128, but nothing happens (led is
>> dead). Tried on ethernut-4.8.7 and 4.9. Board has no external memory.
>> Any ideas what could be wrong?
>> _______________________________________________
>> http://lists.egnite.de/mailman/listinfo/en-nut-discussion
>>
>>
>>
>> Geen virus gevonden in het binnenkomende-bericht.
>> Gecontroleerd door AVG - www.avg.com
>> Versie: 9.0.862 / Virusdatabase: 271.1.1/3216 - datum van uitgifte: 10/24/10 08:34:00
>>
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion
>
>
>
> Geen virus gevonden in het binnenkomende-bericht.
> Gecontroleerd door AVG - www.avg.com
> Versie: 9.0.862 / Virusdatabase: 271.1.1/3216 - datum van uitgifte: 10/24/10 08:34:00
>