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Coursera: Development of Real-Time Systems
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 […]
DNS client on STM32 Nucleo and W5100
December 13, 2015
I am still working on a device consisting of STM32 Nucleo F103RB with a W5100 Ethernet shield. This time I included a DNS client, so that the device can connect to a server by knowing its name. The name resolving can be invoked by using the POSIX functions getaddrinfo and gethostbyname. DNS queries can have different […]
DHCP client on STM32 Nucleo and W5100
December 7, 2015
I am still working on a device consisting of STM32 Nucleo F103RB with a W5100 Ethernet shield. This time I included a DHCP client, so that when the device is attached to a network, it will ask for an IP address instead of being statically allocated. The DHCP protocol follows the RFC 2131 and RFC 2132, and […]
Update on POSIX socket library for W5100: client and server for TCP or UDP
November 22, 2015
I am writing a library that implements POSIX sockets, also called Berkeley sockets, for my ST Nucleo+Ethernet shield setup. The functionality that is currently in place, as for the source code on GitHub, allows for TCP client/server connections and UDP client/server communication using Wiznet W5100 chip resources. The interface is not complete, but what’s in place is taken as literally as I […]
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Freedom Embedded by Francesco Balducci is licensed under a Creative Commons Attribution-Share Alike 4.0 License.
Freedom Embedded 
July 5, 2016
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