Difference between revisions of "SPI"
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| − | 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]] | + | 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 | + | ==VSD SPI bus key features== |
| − | + | Implementation of VSD SPI bus: | |
*All commands are 32 bit packets: | *All commands are 32 bit packets: | ||
**8 bit command ID | **8 bit command ID | ||
| − | **16 bit data | + | **16 bit command parameter |
| − | **8 bit CRC | + | **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) | *Command rate up to 2500 commands/s (80 kbit/s) | ||
==Using VSD SPI== | ==Using VSD SPI== | ||
| − | SPI bus on VSD drives | + | ===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 [http://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232R_CABLES.pdf 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 | * SCLK - clock signal | ||
* MISO - master in, slave out | * MISO - master in, slave out | ||
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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. | 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== | ==See also== | ||
*[[Wikipedia:Serial Peripheral Interface Bus]] | *[[Wikipedia:Serial Peripheral Interface Bus]] | ||
[[Category:Signals]] | [[Category:Signals]] | ||
Latest revision as of 19:47, 18 April 2012
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.
Contents
VSD SPI bus key features[edit | edit source]
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[edit | edit source]
With SimpleMotion library[edit | edit source]
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[edit | edit source]
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.
