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Showing posts from December, 2015

Bitbanging SPI on the Raspberry Pi (via spi-gpio)

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Hello all and happy holidays to everyone! I’m taking a break off work for the holidays so I have a little bit of time on my hands. I will therefore regale you with tales of my exploits!
From my last post, I talked about the somewhat “edge” case where you’d want to add (cheap) Ethernet to a Raspberry Pi, probably the A+ or Zero as the case may be. I haven’t figured out the fixed MAC thing just yet, but I’m working on it. Anyways, after some time, another edge-edge case came to me: The ENC28J60 takes up the only SPI peripheral available on the Pi, so what if you needed to use both the ENC28J60 AND some other SPI device? The Pi’s SPI peripheral has two chip selects, so it is theoretically possible to use the exact same bus while using the first chip select for the ENC28J60 (which it uses by default) and using the second chip select for the other device. However, it goes without saying that network communications require some serious computing firepower so it might cause a bit of a perfor…

Cheap Ethernet on the Raspberry Pi (A+/Zero/all probably)

Hey all,
Been a while since my last post. I'm currently embarking on a one-year compulsory Youth Service program, which for academic purposes means I'm going to be serving my country (Nigeria) for one year by working in an organization. Its formally called the National Youth Service Corps (NYSC) and it begins with a three-week orientation course in the state one has been posted to. The orientation camp was really fun. Met some really amazing people..(I'm thinking of you as I write this, B...)
*ahem*
Shortly after the formal end of the orientation camp I returned home, and some time later I saw the announcement for the Raspberry Pi Zero (which for those who don't know is a single-board computer sporting an ARMv6/ARM11 SoC running at 1GHz with 512MB of RAM, no network options by default and one microUSB host port....for $5..yes, five US dollars). Naturally I was intrigued - I mean, its not exactly monster hardware, but the cost is certainly compelling. Sadly it was sold …