Tag Archives: FreeRTOS

A popular open source real time operating system (RTOS).

The Making Of RTOS Processor Expert Components

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OK, I think this topic is a very special one, and probably not of interest of many folks out there. Or how many want to create a Processor Expert Plugin for an RTOS? Well, I did this. And I think that topic might be very controversial too, especially for all the RTOS vendors out there :-). The thoughts expressed here about creating Processor Expert components do not only apply for an RTOS, but as well for any other ‘complex’ software or stack. So if you are interested about the ‘behind the scenes’ of creating Processor Expert components, especially in the context of an RTOS, then read on ;-).

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Percepio FreeRTOS+Trace V2.2.2 released

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Percepio has released a new V2.2.2 library of FreeRTOS+Trace (see Tracing with FreeRTOS+Trace from Percepio). The new release comes with many improvements. The trace recording is optimized for more efficient recording and longer trace with the same amount of memory.

Note: Because the trace data structure is changed and optimized, I need the latest tool on the PC/host from http://www.percepio.com.

I have updated the Percepio Processor Expert component to generate and use the new trace library V2.2.2. This includes the new settings in the component properties as shown below:
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FreeRTOS V7.1.1 released

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FreeRTOS V7.1.1 was released beginning of May 2012. Finally I had some week-end time to integrate the changes and upgrade the Processor Expert component for it. V7.1.1 comes with smaller and larger changes. This includes maintenance and better support for various ports. One change is the removal of CLI from the original FreeRTOS distribution, an extra port macro and one trace hook macro.

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Tracing with FreeRTOS+Trace from Percepio

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As shown in Tracing FreeRTOS with a Hardware Probe: I have a nice hardware probe to trace out events from my application. But what about to use the target memory as trace buffer? New devices have much more on-chip memory, so this could be an attractive option. That was on my list of future extensions, but then the news came in: Percepio announced their collaboration with FreeRTOS+Trace: exactly what I needed!

It is using the same concept as the FreeRTOS Trace Probe: the trace hooks provided by the FreeRTOS API. But instead streaming it off the target as with the FreeRTOS Trace probe, it is using a RAM buffer on the device. The real cool thing is: the Percepio trace viewer is very, very nice!

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Tracing FreeRTOS with a Hardware Probe

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Using an RTOS is an excellent thing: it provides services and allows to scale my application. But it adds complexity. With many tasks, queues and semaphores it is hard to have an overview what is going on. To get visibility, Martin Bucher has developed in a bachelor diploma work the FreeRTOS Trace Probe. Continue reading →

USB or not: CDC with Processor Expert

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I had a PREN student showing up into my office. He wanted to choose a microcontroller for that project. One requirement put on the table was “it needs USB”. Well, I asked why USB is required. I was not surprised by the answer: “to use USB instead of RS-232”. Wow. So what he really wanted was USB CDC (Communication Device Class). Yep. Most notebooks today have no serial COM port (see “Processor Expert Configurations“). But because “USB is serial” does not mean “USB CDC is simple”. Nope. USB is not simple. But it can be with Processor Expert.

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Back to Classic: FreeRTOS for Freescale S12(X)

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One thing which is missing with the CodeWarrior for MCU10.2 announcement: MCU10.2 does not support the S12(X) from Freescale.

With this I still have several projects not ported to eclipse. So they are still implemented using the ‘classic’ (non-eclipse based) version of CodeWarrior for S12(X). And I’m using FreeRTOS in the eclipse based IDE with Processor Expert for S08, ColdFire and Kinetis, but not yet for the S12(X). What now?
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