Recently I’ve trying to use Freescale’s C90TFS Flash Driver for erasing and programming on-chip flash on their Kinetis MKL25Z128 Cortex M0+ processor. This is the same processor as used on the Freescale Freedom board. At the time of writing, the…
Freescale Kinetis USB Bootloader
I’ve been doing some work with a Kinetis MKL25Z128 Cortex-M0+ processor. I love what you get for the very small amount of money this thing costs. It even contains a 16 bit A/D converter, which is very rare at this…
FreeNAS Weekly Status Email
Older versions of FreeNAS would email periodic status reports, however the newer 9.x versions no longer do this. FreeNAS now only sends emails when something strange or bad happens. It makes sense – lots of “everything’s fine” emails tends to…
Building a Do It Yourself NAS
Introduction NAS (Network Attached Storage) devices, also known as a home server, are pretty common these days. They’re great for having a central point to store files; as a media server for holding photos and home movies; as a place…
If Apple Wins We All Lose
I’m not generally one to repost articles and links to articles – you won’t find much of that on my blog. Nor am I particularly pro-this or anti-that when it comes to technologies, brands, companies, etc. I have Apple products…
Do It Yourself Signal Generator Probe
Some time ago I built a signal generator, which is a reasonably handy bit of equipment. But I was periodically frustrated with not having a suitable probe to easily inject a signal into a circuit. The standard BNC – BNC…
Class 10 SD Card – Or Not?
Recently I purchased a Class 10 SD Card from a major retailer. I was very excited – now I have a fast card for testing. Here’s my new baby: Note the 10 in the part-circle indicating the speed. For those…
STM32F2xx Digital Camera Interface (DCMI)
I’m using the STM32F2xx DCMI port to receive data from an CMOS image sensor. There aren’t too many Cortex-M3 or M4 parts which have this ability natively; the STM32F2xx is a rare breed. It’s a very nice feature. Along the…
STM32F2xx DMA Controllers
If you’re moving a bunch of data around, the DMA controllers are going to be your best friends. However they have their quirks and undocumented features. This post will describe what I’ve learned about them, and hopefully others can contribute…
STM32F2xx Processor Learnings
I’ve been doing a lot of work recently with the new ST processor, the STM32F2xx family. It’s a Cortex-M3 part running at 120 MHz. It’s a nice part, however I’ve lost a lot of time discovering, well, let’s not call…