There is a new app-note document available on the XMOS website, entitled "Shift Register Expansion Of XMOS XS1 Devices".
It explains how to use cheap and simple shift registers to expand the I/O capabilities of an XMOS device when you have run out of pins. This especially useful for driving arrays of things like LEDs (up to chains of ~300) and buttons.
Code & Gerbers: https://github.com/xcore/proj_shift_registers
Archived XCore tutorials.
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