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Showing posts from September, 2010

Moving code from ESP8266 to ESP32

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A while ago I made a mashup of Dan Royer's code CNC 2 Axis Demo with my own code for trapezoidal motion stepper and servo control for ESP8266.

I assumed porting the code to the ESP32 would be trivial, and that was true for the most part: changes like library name being Wifi.h instead of Wifi8266.h were not a problem. UDP now does not like multicharacter writes but you can use print instead. So far so good.

However, when it came to the interrupt code I was stuck with the stepper interrupt causing an exception sometimes. And to make things weirder, the servo interrupt worked flawlessly (both of them had the IRAM_ATTR directive if you ask me).

Going little by little, I could narrow down the culprit to a floating point operation during the interrupt, that would cause problems sometimes but not always. Browsing around I found this post. Where the solution was simple: do not use floats within the interrupt routines but doubles. The reason was the float calculation would be performed by…

Any magic on the new Apple touchpad?

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I liked the idea of a new tracking device. I guess some time using the iPad gave me the wrong idea on what it could feel like to have a similar interface as a mouse replacement.
The same day I received an email from Apple stating the new Magic Trackpad was available I rang a local shop to see if they have it. I was told that because it was announced today they did not have it. That I should wait a few weeks before they would have it. Weird.
Anyway, after the summer holidays I wanted to switch one of our iMacs to wireless keyboard and mouse so after being turned down in one Apple shop (a different one), where again I was told I will still have to wait an unknown amount of time (not very helpful direction). Hopefully, I stopped by a third shop where I bought a Bluetooth keyboard and a Magic Trackpad.
Trackpad is ok but not magic. For the same money I would suggest anyone to go for a Magic Mouse. It is not that the trackpad does not work, but I've found much more convenient to use the …

Bye S90, Hello S95

The Canon PowerShot S90 I've bought a few months ago had a problem. I had to sent it back to Canon to be serviced. I was unlucky and after more than two months waiting I complained to Canon.
It transpired that a new part was needed for the repair. My long wait was rewarded with a brand-new PowerShot S95 instead.
Even the seller (I bought it on eBay) was so ashamed about me waiting that long that gave away a 4GB SD memory too.

Have a look at this analysis.

Plastic Logic bites the dust

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I was very excited by what this company was about to deliver. But unfortunately they have cancelled the launch of their QUE electronic ink device.
In the mean time, Amazon and Barnes & Noble get into price fight that drove down the prices of their entry-line ebook readers to around $140. This is around halve of the original price and what is better, more features are added to the new devices (ie: wifi).
I really like the new Kindle 3 and over the summer I've been reading a lot on my 6" Papyre ebook reader. I've come to the conclusion that 6" is more convenient than the larger size of Kindle DX for reading novels. I'm kind of disappointed with KDX as it is not good for letter-size documents (or A4-size) in my opinion.
I've used a lot our iPad over the summer but just for browsing and, more importantly, to use the Maps application to find where to have dinner or to look for the route to a destination (very handy when travelling). However I've read not a…