Did you really think the Raspberry Pi would stop getting better? At this point, we sound like a broken record, extolling on the new Pi’s myriad improvements like we’re surprised that the folks at the Raspberry Pi Foundation are continuously making their flagship board better. Still, we’ll say it again - the Raspberry Pi team have outdone themselves. The Raspberry Pi 3 Model B is out and it is AMAZING.
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We use a special library called adafruit_blinka (named after Blinka, the CircuitPython mascot) to provide the layer that translates the CircuitPython hardware API to whatever library the Linux board provides.
For example, on Raspberry Pi we use the python RPi.GPIO library. For any I2C interfacing we'll use ioctl messages to the /dev/i2c device. For SPI we'll use the spidev python library, etc. These details don't matter so much because they all happen underneath the adafruit_blinka layer.