Python bindings for Linux SPI access through spidev
Project description
#Python Spidev
This project contains a python module for interfacing with SPI devices from user space via the spidev linux kernel driver.
This is a modified version of the code originally found [here](http://elk.informatik.fh-augsburg.de/da/da-49/trees/pyap7k/lang/py-spi)
##Usage
`python import spidev spi = spidev.SpiDev() spi.open(bus, device) to_send = [0x01, 0x02, 0x03] spi.xfer(to_send) ` ##Settings
- bits_per_word
- cshigh
- loop
- lsbfirst
- max_speed_hz
- mode - SPI mode as two bit pattern of clock polarity and phase [CPOL|CPHA], min: 0b00 = 0, max: 0b11 = 3
- threewire - SI/SO signals shared
##Methods
####open(bus, device)
Connects to the specified SPI device, opening /dev/spidev-bus.device
####readbytes(n)
Read n bytes from SPI device.
####writebytes(list of values)
Writes a list of values to SPI device.
####xfer(list of values[, speed_hz, delay_usec, bits_per_word])
Performs an SPI transaction. Chip-select should be released and reactivated between blocks. Delay specifies the delay in usec between blocks.
####xfer2(list of values[, speed_hz, delay_usec, bits_per_word])
Performs an SPI transaction. Chip-select should be held active between blocks.
####close()
Disconnects from the SPI device.
#Changelog
## 3.0
- Memset fix recommended by Dougie Lawson
- Fixes for Kernel 3.15+ from https://github.com/chrillomat/py-spidev
- Fixes for Python 3/2 compatibility.
- Added subclassing support - https://github.com/doceme/py-spidev/issues/10
## 2.0
Code sourced from http://elk.informatik.fh-augsburg.de/da/da-49/trees/pyap7k/lang/py-spi and modified.
## Pre 2.0
spimodule.c originally uathored by Volker Thoms, 2009.
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