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#581 – Real Time Operating Systems with Brian Amos
Welcome, Brian Amos, author of Hands-on RTOS with Microcontrollers
- Learned about the book from past guest Phillip Johnston. Also talked to Alvaro Prieto (Unnamed RE) about FreeRTOS.
- “How do I RTOS?”
- When do you want to use a Real Time Operating System (RTOS)?
- Assume you can from a state machine
- User interface you’ll want it
- Communication capability (IoT devices)
- Differentiating OS vs RTOS
- Amazon acquired FreeRTOS in 2017
- FreeRTOS is a bottom up methodology
- It’s possible to make a completely statically allocated memory for a project (no heap, no malloc, etc)
- Simple examples around reading a sensor, pump status, screen, internet
- System level design decisions
- Interrupt Service Routine (ISR)
- Ticks are important
- How did Brian get into this?
- Brian was working on a product that had a
- Telos module
- MSP430
- TinyOS
- nesC?
- James Grenning’s book on TDD for embedded
- Modern micros can do a lot in parallel, especially using hardware like DMA
- Troubleshooting an RTOS
- SEGGER Ozone (debugger)
- SystemView
- Percipio Tracealyzer
- Many of the graphics in the book are available on Brian’s github page as CC by SA licensing
- Page 48 graphic
- Brian taunts us on Page 98 showing lots of STM32 parts in stock…
- NucleoF7 board used in examples (unsurprisingly…out of stock)
- There’s an onboard debugger that you can reprogram to Segger
- Going through exercises
- Working with HALs
- Logic analyzer for troubleshooting
- Embedded Linux
- Still goes bck to superloop
- Find Brian on:
- GitHub
- Amazon book