SPI protocol of VSD-E/XE

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VSD-E and VSD-XE features SPI serial communication bus for parameterization and control. SPI is used by GDtool to communicate with the drive.

The actual SPI protocol is largely undocumented, however a sample implementation is available in the SimpleMotion library V0.x library source codes. By default the SM library supports the FTDI TTL232R USB adapter in bit-bang mode to communicate to the SPI bus.

The source code has template/skeleton for general purpose bit bang I/O control to achieve the same functionality also on other devices such as MCUs.

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