--- In l..., Felipe de Andrade Neves Lavratti wrote: >
> Hello...
>
> I am looking for a very simple RTOS, have tryed many (Keil, uCOS, IAR
> one) but no one is free, I only know FreeRTOS as being free but I found it
> really complex to understand (I spent several hours reading the samples and
> trying to port), so I am looking for a free RTOS system for LPC2xxx simple
> and light.
>
> What do you suggest?
>
> Thanks.
>> I don't think you will find one much simpler
than FreeRTOS. FreeRTOS is about is simple as it gets, if you want a true RTOS.
If you want something smaller yet, then you are looking for a task manager.
Chris.
Reply by stevech11●June 27, 20092009-06-27
Prognosis of future bug-fixes aside, here's another. Also, be sure you need
a preemptive RTOS versus a cooperative tasking system. The latter is far
simpler, and with state machines in each task, often suffices.
--- In l..., "FreeRTOS info" wrote: >
> > I am looking for a very simple RTOS, have tryed many (Keil, uCOS, IAR
> > one) but no one is free, I only know FreeRTOS as being free
> > but I found it
> > really complex to understand (I spent several hours reading
> > the samples and
> > trying to port), so I am looking for a free RTOS system for
> > LPC2xxx simple
> > and light.
>
> I don't think you will find one much simpler than FreeRTOS. The demos
are
> very comprehensive and serve to both test the port and provide examples of
> every API function, rather than be a simple start. If you want a good
> starting point just define two tasks that do nothing but toggle an LED:
>
> void vTask1( void *pv )
> {
> ____for( ;; ) // For ever
> ____{
> ________ToggleLED( 0 ); // Toggle LED 0
> ________vTaskDelay( 1000 ); /// Delay 1000 ticks.
> ____}
> }
>
> void vTask2( void *pv )
> {
> ____for( ;; ) // For ever
> ____{
> ________ToggleLED( 1 ); // Toggle LED 1
> ________vTaskDelay( 500 ); /// Delay 500 ticks.
> ____}
> }
>
>
> int main( void )
> {
> ____// Create an instance of each task
> ____xTaskCreate( vTask1, ........ );
> ____xTaskCreate( vTask2, ........ );
>
> ____// Start the tasks running.
> ____vTaskStartScheduler();
>
> ____// Should never reach here.
> ____for( ;; );
> }
>
>
> If you want a step by step explanation/tutorial then you can buy the eBook,
> it comes with the source code for all the examples it presents:
> http://www.FreeRTOS.org/Documentation
>
>
> Regards,
> Richard.
>
> + http://www.FreeRTOS.org
> Designed for Microcontrollers. More than 7000 downloads per month.
>
> + http://www.SafeRTOS.com
> Certified by T as meeting the requirements for safety related systems.
>
Reply by rtstofer●June 27, 20092009-06-27
--- In l..., "FreeRTOS info" wrote:
>
> If you want a step by step explanation/tutorial then you can buy the eBook,
> it comes with the source code for all the examples it presents:
> http://www.FreeRTOS.org/Documentation
> Regards,
> Richard.
I just ordered both books; thanks for preparing them. I have been successful
with FreeRTOS on the LPC2106 and LPC2148 but I look forward to having printable
material. I just seem to 'get it' faster when I have a book.
Richard
Reply by FreeRTOS info●June 27, 20092009-06-27
> I am looking for a very simple RTOS, have tryed many
(Keil, uCOS, IAR
> one) but no one is free, I only know FreeRTOS as being free
> but I found it
> really complex to understand (I spent several hours reading
> the samples and
> trying to port), so I am looking for a free RTOS system for
> LPC2xxx simple
> and light.
I don't think you will find one much simpler than FreeRTOS. The demos
are
very comprehensive and serve to both test the port and provide examples of
every API function, rather than be a simple start. If you want a good
starting point just define two tasks that do nothing but toggle an LED:
void vTask2( void *pv )
{
____for( ;; ) // For ever
____{
________ToggleLED( 1 ); // Toggle LED 1
________vTaskDelay( 500 ); /// Delay 500 ticks.
____}
}
int main( void )
{
____// Create an instance of each task
____xTaskCreate( vTask1, ........ );
____xTaskCreate( vTask2, ........ );
____// Start the tasks running.
____vTaskStartScheduler();
____// Should never reach here.
____for( ;; );
}
If you want a step by step explanation/tutorial then you can buy the eBook,
it comes with the source code for all the examples it presents: http://www.FreeRTOS.org/Documentation
Regards,
Richard.
+ http://www.FreeRTOS.org
Designed for Microcontrollers. More than 7000 downloads per month.
+ http://www.SafeRTOS.com
Certified by T as meeting the requirements for safety related systems.
Reply by Felipe de Andrade Neves Lavratti●June 27, 20092009-06-27
Hello...
I am looking for a very simple RTOS, have tryed many (Keil, uCOS, IAR
one) but no one is free, I only know FreeRTOS as being free but I found it
really complex to understand (I spent several hours reading the samples and
trying to port), so I am looking for a free RTOS system for LPC2xxx simple
and light.
