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Event-driven firmware design with hardware handler scheduling on Cortex-M-based microcontroller

Mazur G.

Measurement Automation Monitoring

2018

Vol. 64, No. 1

20--22

The paper describes the concept and the design principles of a purely event-driven firmware for a Cortex-M core microcontroller used in an embedded system, based on hardware-scheduled event handling routines. The concept may be a practical alternative to the design paradigm based on an event loop or a real-time operating system, especially for not overly complex designs. When compared to an RTOS-based approach, the presented technique enables much shorter event response time and simpler synchronization of accesses to critical shared resources.

Software-Defined Computer with a Classic Microprocessor

Kosowska J., Mazur G.

Measurement Automation Monitoring

2017

Vol. 63, No. 5

186--188

The paper describes the concept and the design process of a software-defined computer built for didactic purposes and as a proof-of-concept. The computer uses a classic microprocessor from the 1980s with all of its other components – memory, I/O, supplementary glue logic and a hardware bus monitor implemented with a contemporary mainstream microcontroller with Cortex-M family core. The concept of a software-defined computer was successfully implemented with four significantly different microprocessors. The computer may be used for illustrating the operation of a processor and for teaching the basics of low-level programming. It is also capable of running CP/M operating system. Its operation is controlled at both hardware and software level from a PC via two instances of a terminal emulator software.