Browsing All Posts filed under »Embedded«

Coursera: Development of Real-Time Systems

July 5, 2016


A course on the theories and implementations of real-time systems is about to start on Coursera platform. The course comes from the Finnish University Åbo Akademi, and lasts 5 weeks of low workload (2-3h per week). The instructor entices the learner by showing a famous real-time system failure, during the landing of the Apollo 11 on the surface of the […]

STM32 Nucleo: access SD cards with C standard library

July 3, 2016


The ST Nucleo is an Arduino-like board with an STM32 as the microcontroller, and many Arduino shields can be mounted on it. I recently played with an Ethernet shield for the network connection, but since the shield also contains a microSD card slot, I wanted to access the SD card to read/write files. I’d like to […]

Phil Koopman: Top 5 Embedded Software Problem Areas

May 31, 2016


The following resource is a thoughtful checklist that embedded software developers can take as inspiration to improve the product. It also links to further resources (as well as the author’s book) to explore the topics and analyze in depth the rationale of some of his suggestions. Better Embedded System SW: Top 5 Embedded Software Problem Areas – Five areas to dig into […]

Inline assembly in GCC [linux-insides]

May 2, 2016


The news site lwn just posted a guide on GCC inline assembly. The guide is written in plain colloquial language and is a great complement to GCC documentation on the matter, which is more of a reference of the various functionalities. I found that the extended form of inline assembly is a powerful way to use the machine special […]

Simple time synchronization for the Internet of Things

February 18, 2016


While adding HTTPS capabilities to my STM32 Nucleo board, I needed to solve the problem of current time. This is because TLS needs to check certificate expiration date, so we need a sufficiently accurate estimation of time. So I tried to understand what could I do to ask a network server about the time. I […]

HTTPS client on STM32 Nucleo-F411RE

February 4, 2016


One of my goal of the past months was to use an STM32 Nucleo board to get a webpage through HTTPS, using an Ethernet shield for TCP/IP stack. I was close last time, but I discovered that my Nucleo-F103RB did not have enough RAM. Now I have my hands on a Nucleo-F411RE that has 128KiB of RAM […]

STM32 NUCLEO-F103RB has low resources for TLS 1.2

January 10, 2016


It’s been months since I started playing with a STM32 Nucleo + Ethernet shield. One of the objectives that I chase is to build a device for the Internet of Things that implement reasonably secure communications. In an effort to avoid reinventing the wheel (or at least to not reinvent too many wheels) I wanted to see if […]