Debugging CPU

In this post I’ll explain how I debug the new core of AEMB, and the current bug that I’m facing. Debugging the CPU takes place using the demo program originally attached with AEMB. The waveform generated from the demo program running on the new CPU is compared with the waveform Read more…

CPU Modifications

In the previous post I’ve explained how the threading model of the new AEMB. In this post I will explain all the changes to the old AEMB core that were necessary to accommodate a coarse grained model and sum up with an analysis of how the new threading model affects Read more…

Coarse-Grained Threading

Finally I’ve changed the threading model of the AEMB. While some instructions are still buggy and hence the demo program doesn’t run properly, I still want to use this post and the next one to explain the changes I’ve made so far. In this post I’ll explain about the design Read more…

Enabling/Disabling Interrupts

Regarding my previous post on the interrupt crashing the FreeRTOS tasks, I went and research on the method used for enabling and disabling interrupts on AEMB through software. There are two simple functions used to do the job, which are portDISABLE_INTERRUPTS() and portENABLE_INTERRUPTS(). These two functions will disable and enable Read more…

Interrupt Behaviour

I would like to look deeper into the application of FreeRTOS interrupts on the latest version of AEMB. It is important to be able to clearly identify the context switching by the interrupt on both threads of AEMB. To look more into the interrupts, the tasks are written with longer Read more…

Different Priorities

The task priority of FreeRTOS is tested on the new AEMB processor. The previous programs tested all contains tasks of equal priorities with the idle task. Therefore, higher priority tasks are to be tested to see their effect on the new AEMB processor. Will the higher priority tasks act independent Read more…