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40 lines
1.1 KiB
40 lines
1.1 KiB
import gex
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class USART(gex.Unit):
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"""
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USART
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"""
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def _type(self):
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return 'USART'
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def listen(self, handler, decode='utf-8'):
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"""
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Attach a Rx listener callback.
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decode can be: None, 'utf-8', 'ascii' (any valid encoding for bytearray.decode())
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None decoding returns bytearray
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"""
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self.handler_decode = decode
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self.handler = handler
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def write(self, payload, sync=False, confirm=True):
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"""
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Write bytes. If 'sync' is True, wait for completion. sync implies confirm
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"""
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if type(payload) is str:
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payload = payload.encode('utf-8')
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pb = gex.PayloadBuilder()
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pb.blob(payload) # payload to write
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self._send(0x01 if sync else 0x00, pb.close(), confirm=confirm or sync)
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def _on_event(self, event:int, payload):
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if event == 0:
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# Data received
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if self.handler:
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data = payload if self.handler_decode is None \
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else payload.decode(self.handler_decode)
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self.handler(data)
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