What exactly is multitasking, scheduling, and context switching? This is a great question for those interested in understanding how operating systems work, even small real-time operating systems (RTOS). [Jeffrey] had the same question, so he built a multitasking scheduler for the MSP430F5529 LaunchPad.
These topics are some of the most difficult to wrap your head around in the embedded world. Choosing a project that helps you understand tough topics is a great way to learn, plus it can be very rewarding. In his post, [Jeffrey] goes over the basics of how all of these things work, and how they can be implemented on the MSP430. Overall, it is a great read and very informative. For more information on RTOS, check out a few sections in the FreeRTOS book. Be sure to see his code in action after the break.
[Jeffery] was nice enough to release all of his code as open source, so be sure to check out his repository on GitHub. “Feel free to use it and learn more. I have made the code self explanatory. Enjoy!”
Continue reading “Multitasking on the MSP430F5529 LaunchPad”
The Linksys router seen about is a WRT54G version 1. It famously runs Linux and was the source of much hacking back in the heyday, leading to popular alternative firmware packages such as DD-WRT and Tomato. But the company went away from a Linux-based firmware starting with version 8 of the hardware. Now they are using a proprietary Real Time Operating System called VxWorks.
[Craig] recently put together a reverse engineering guide for WRT54Gv8 and newer routers. His approach is purely firmware based since he doesn’t actually own a router that runs VxWorks. A bit of poking around in the hex dump lets him identify different parts of the files, leading to an ELF header that really starts to unlock the secrets within. From there he carries out a rather lengthy process of accurately disassembling the code into something that makes sense. The tool of choice used for this is IDA Pro diassembler and debugger. We weren’t previously familiar with it, but having seen what it can do we’re quite impressed.
[Image via Wikimedia Commons]
It seems that we have caught Design Contest Fever here at Hackaday. After covering some other design contests, and asking readers to send in more, we heard from a couple tippers about Renesas’ challenge. Like many of the other contests, entrants can submit their ideas, and possibly receive a free development board to get them started. Unlike the other contests though, Renesas board (possibly) free development board is everything but the kitchen sink. Designed with RTOS’s in mind, rather than the normal microcontroller tasks, this board has an astounding number of capabilities.
On top of the excellent development kit, the contest is also offering books, software, and cash prizes to the winners. So get out there, design something amazing, and make Hackaday proud.