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The mpssespi package is a "C" based extension that interfaces the FTDI libMPSSE-SPI library to Tcl. The FTDI libMPSSE-SPI library is an interface to FTDI USB to serial converter chips that allows these chips to control SPI bus based computer peripherals. The mpssespi package allow a peripheral chip, appropriately configured to an FTDI USB to serial converter chip, to be controlled from Tcl.
Several pre-build packages and documentation can be found on the downloads page.