Source code for pynq.uio

#   Copyright (c) 2017, Xilinx, Inc.
#   SPDX-License-Identifier: BSD-3-Clause


import asyncio
import functools
import os



[docs]def get_uio_device(dev_name): """Returns the UIO device path. This method will return None if no such device can be found. Parameters ---------- dev_name : str The name of the UIO device. Returns ------- str The path of the device in /dev list. """ for dev in os.listdir("/sys/class/uio"): with open('/sys/class/uio/' + dev + '/name', 'r') as f: name = f.read().strip() if name == dev_name: return '/dev/' + dev return None
[docs]def get_uio_index(name): """Return the uio index for the given device. Parameters ---------- name : str The name of the UIO device. Returns ------- int The index number for the UIO device. """ d = get_uio_device(name) if d is None: return None return int(d[len(d.rstrip('0123456789')):])
[docs]class UioController(object): """Class that interacts directly with a UIO device. Attributes ---------- uio : _io.BufferedRandom File handle for the opened UIO. """ def __init__(self, device): """Initialize the UIO controller. Parameters ---------- device : str The path of the device extracted from /dev. """ self.uio = open(device, 'r+b', buffering=0) asyncio.get_event_loop().add_reader(self.uio, functools.partial( UioController._uio_callback, self)) self.wait_events = [] def __del__(self): asyncio.get_event_loop().remove_reader(self.uio) self.uio.close() def _uio_callback(self): self.uio.read(4) current_events = self.wait_events self.wait_events = [] for e in current_events: e.set()
[docs] def add_event(self, event, number): if not self.wait_events: self.uio.write(bytes([0, 0, 0, 1])) self.wait_events.append(event)