pylibftdi is a minimal Pythonic interface to FTDI devices using libftdi. Rather than simply expose all the methods of the underlying library directly, it aims to provide a simpler API for the main use-cases of serial and parallel IO, while still allowing the use of the more advanced functions of the library.
The primary interface is the
Device class in the
pylibftdi package; this
gives serial access on relevant FTDI devices (e.g. the UM232R), providing a
file-like interface (read, write). Baudrate is controlled with the
If a Device instance is created with
mode='t' (text mode) then read() and
write() can use the given
encoding (defaulting to latin-1). This doesn’t
make a lot of difference on Python 2 (and can be omitted), but allows easier
integration with passing unicode strings between devices in Python 3.
Multiple devices are supported by passing the desired device serial number (as
a string) in the
device_id parameter - this is the first parameter in both
Device() and BitBangDevice() constructors. Alternatively the device ‘description’
can be given, and an attempt will be made to match this if matching by serial
In the event that multiple devices (perhaps of identical type) have the same
description and serial number, the
device_index parameter may be given to
open matching devices by numerical index; this defaults to zero, meaning the
first matching device.
>>> from pylibftdi import Device >>> >>> with Device(mode='t') as dev: ... dev.baudrate = 115200 ... dev.write('Hello World')
The pylibftdi.BitBangDevice wrapper provides access to the parallel IO mode of
operation through the
direction properties. These provide an
8 bit IO port including all the relevant bit operations to make things simple.
>>> from pylibftdi import BitBangDevice >>> >>> with BitBangDevice('FTE00P4L') as bb: ... bb.direction = 0x0F # four LSB are output(1), four MSB are input(0) ... bb.port |= 2 # set bit 1 ... bb.port &= 0xFE # clear bit 0
There is support for a number of external devices and protocols, specifically for interfacing with HD44780 LCDs using the 4-bit interface.