litex/tools/litex_crossover_uart.py

   1 #!/usr/bin/env python3
   2
   3 # This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
   4 # License: BSD
   5
   6 # Proof of Concept to use the crossover UART with lxterm over a bridge.
   7
   8 import os
   9 import pty
  10 import threading
  11
  12 from litex import RemoteClient
  13
  14 wb = RemoteClient()
  15 wb.open()
  16
  17 # # #
  18
  19 def pty2crossover(m):
  20     while True:
  21         r = os.read(m, 1)
  22         wb.regs.uart_xover_rxtx.write(ord(r))
  23
  24 def crossover2pty(m):
  25     while True:
  26         if wb.regs.uart_xover_rxempty.read() == 0:
  27             r = wb.regs.uart_xover_rxtx.read()
  28             os.write(m, bytes(chr(r).encode("utf-8")))
  29
  30 m, s = pty.openpty()
  31 print("LiteX Crossover UART created: {}".format(os.ttyname(s)))
  32
  33 pty2crossover_thread = threading.Thread(target=pty2crossover, args=[m])
  34 pty2crossover_thread.start()
  35
  36 crossover2pty(m)
  37
  38 # # #
  39
  40 wb.close()