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 […]
The desktop where I do most of my stuff is a Debian testing 32bit. Recently Google Chrome team declared the end of support of 32bit Linux distributions, and I decided to take the occasion to migrate towards a 64bit Debian. I read some guides around, some old, some with big warnings and disclaimers, some interesting. Ultimately I […]
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 […]
Chris Anderson, the creator of TED, interviews Linus Torvalds on the traits that are useful to create and maintain something remarkable as Linux. Linus appears as his usual self, joking about his own defects, and being overall very lucid in its analysis of the current status of Linux kernel and what happened to get there. He […]
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 […]
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 […]
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 […]
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 […]
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 […]
My mother has an Acer Aspire One 522 netbook (as for the post title) and used it to surf the net and play some Facebook games… until it fell hard while it was on, and it wouldn’t boot any more: it would get stuck on the boot screen where you can tap F2 to enter […]
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Freedom Embedded 
July 3, 2016
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