fix crc calc for non-express boards #10
Merged
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Bug fix for non-Express boards. Library works on Express CircuitPython boards where an integer doesn't have an upper bound, but on non-express boards, like the QT Py M0, int has an upper bound that is getting overflowed and throwing an exception. This fix drops bits above a byte on each CRC calc change to prevent the overflow (which was probably happening in C anyway).
Fix to issue brought up on this forum topic: QTPyM0: "small int overflow" on CRC calc w lc709203