SPI

SPI (Serial Peripheral Interface) is a serial communication link used in VSD-A and VSD-E and VSD-XE drives. SPI is used to set drive parameters and it also can be used for control with SimpleMotion library.

VSD SPI bus key features

Implementation of VSD SPI bus:

• All commands are 32 bit packets:
  • 8 bit command ID
  • 16 bit command parameter
  • 8 bit CRC error checking
• By sending one command, drive responds simultaneously with 32 bit return data packet:
  • 8 bit status bits (usually not needed by application)
  • 16 bit return data
  • 8 bit CRC error checking
• Command rate up to 2500 commands/s (80 kbit/s)

Using VSD SPI

With SimpleMotion library

SimpleMotion library communicates to VSD-E and VSD-XE drives via SPI bus. The phyiscal transfer link between PC and VSD drive is FTDI TTL232R USB serial adapter.

From low level hardware

SPI bus on VSD drives requires 3 data wires, ground and 3-5 VDC supply (5 wires total):

• SCLK - clock signal
• MISO - master in, slave out
• MOSI - master out, slave in

VSD drive is the slave device.

SPI signals are relatively easy to generate with any programmable device with digital I/O's such as microcontrollers. SimpleMotion source code can be ported on many platforms including MCU's.

See also

• Wikipedia:Serial Peripheral Interface Bus

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