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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

## 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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