Bastian Bloessl
53 lines
1.2 KiB
Python
53 lines
1.2 KiB
Python
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def encoding_to_parameters(encoding):
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encodings = [
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{"bpsc": 1, "cbps": 48, "dbps": 24},
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{"bpsc": 1, "cbps": 48, "dbps": 36},
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{"bpsc": 2, "cbps": 96, "dbps": 48},
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{"bpsc": 2, "cbps": 96, "dbps": 72},
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{"bpsc": 4, "cbps": 192, "dbps": 96},
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{"bpsc": 4, "cbps": 192, "dbps": 144},
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{"bpsc": 6, "cbps": 288, "dbps": 192},
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{"bpsc": 6, "cbps": 288, "dbps": 216}
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]
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enc = encodings[encoding]
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return enc["bpsc"], enc["cbps"], enc["dbps"]
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def payload_to_symbols(payload, encoding):
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bpsc, cbps, dbps = encoding_to_parameters(encoding)
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# 24 header + 4 crc + payload
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data_byte = 24 + 4 + payload
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symbols = int(round((16 + data_byte * 8 + 6) / float(dbps) + 0.5))
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return symbols + 5
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def mac_payload_to_payload(payload):
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return payload - 28
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def payload_to_mac_payload(payload):
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return payload + 28
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def payload_to_samples(payload, encoding):
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return payload_to_symbols(payload, encoding) * 80 + 1
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def symbols_to_payload(symbols, encoding):
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bpsc, cbps, dbps = encoding_to_parameters(encoding)
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bytes = (((symbols - 5) * dbps) - 16 - 6) / 8
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assert(bytes > 28)
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return bytes - 24 - 4
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