kopia lustrzana https://github.com/peterhinch/micropython-samples
93 wiersze
2.6 KiB
Python
93 wiersze
2.6 KiB
Python
# iotest2.py Test PR #3836. User class write() performs buffered writing.
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# Reading is unbuffered.
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import io, pyb
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import uasyncio as asyncio
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import micropython
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micropython.alloc_emergency_exception_buf(100)
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MP_STREAM_POLL_RD = const(1)
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MP_STREAM_POLL_WR = const(4)
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MP_STREAM_POLL = const(3)
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MP_STREAM_ERROR = const(-1)
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def printbuf(this_io):
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for ch in this_io.wbuf[:this_io.wprint_len]:
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print(chr(ch), end='')
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this_io.wbuf = b''
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class MyIO(io.IOBase):
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def __init__(self):
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self.ready_rd = False
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self.ready_wr = False
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self.wbuf = b''
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self.wprint_len = 0
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self.ridx = 0
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self.rbuf = b'ready\n' # Read buffer
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pyb.Timer(4, freq = 1, callback = self.do_input)
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pyb.Timer(5, freq = 10, callback = self.do_output)
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# Read callback: emulate asynchronous input from hardware.
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# Typically would put bytes into a ring buffer and set .ready_rd.
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def do_input(self, t):
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self.ready_rd = True # Data is ready to read
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# Write timer callback. Emulate hardware: if there's data in the buffer
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# write some or all of it
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def do_output(self, t):
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if self.wbuf:
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self.wprint_len = self.wbuf.find(b'\n') + 1
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micropython.schedule(printbuf, self)
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def ioctl(self, req, arg): # see ports/stm32/uart.c
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# print('ioctl', req, arg)
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ret = MP_STREAM_ERROR
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if req == MP_STREAM_POLL:
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ret = 0
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if arg & MP_STREAM_POLL_RD:
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if self.ready_rd:
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ret |= MP_STREAM_POLL_RD
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if arg & MP_STREAM_POLL_WR:
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if not self.wch:
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ret |= MP_STREAM_POLL_WR # Ready if no char pending
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return ret
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# Test of device that produces one character at a time
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def readline(self):
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self.ready_rd = False
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ch = self.rbuf[self.ridx]
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if ch == ord('\n'):
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self.ridx = 0
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else:
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self.ridx += 1
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return chr(ch)
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def write(self, buf, off, sz):
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self.wbuf = buf[:]
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return sz # No. of bytes written. uasyncio waits on ioctl write ready
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myio = MyIO()
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async def receiver():
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sreader = asyncio.StreamReader(myio)
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while True:
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res = await sreader.readline()
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print('Received', res)
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async def sender():
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swriter = asyncio.StreamWriter(myio, {})
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await asyncio.sleep(5)
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count = 0
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while True:
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count += 1
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tosend = 'Wrote Hello MyIO {}\n'.format(count)
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await swriter.awrite(tosend.encode('UTF8'))
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await asyncio.sleep(2)
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loop = asyncio.get_event_loop()
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loop.create_task(receiver())
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loop.create_task(sender())
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loop.run_forever()
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