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64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
# Collection of procedures related to ESLs
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# 2018 furrtek - furrtek.org
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# See LICENSE
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def terminate_frame(frame, repeats):
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# Compute whole frame's CRC16
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result = 0x8408
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poly = 0x8408
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for by in frame:
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result ^= by
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for bi in range(0, 8):
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if (result & 1):
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result >>= 1
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result ^= poly
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else:
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result >>= 1
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frame.append(result & 255)
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frame.append((result // 256) & 255)
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frame.append(repeats & 255) # This is used by the transmitter, it's not part of the transmitted data
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frame.append((repeats // 256) & 255) # This is used by the transmitter, it's not part of the transmitted data
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def make_raw_frame(protocol, PLID, cmd):
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frame = [protocol, PLID[3], PLID[2], PLID[1], PLID[0], cmd]
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return frame
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def make_mcu_frame(PLID, cmd):
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frame = [0x85, PLID[3], PLID[2], PLID[1], PLID[0], 0x34, 0x00, 0x00, 0x00, cmd]
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return frame
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def append_word(frame, value):
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frame.append(value // 256)
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frame.append(value & 255)
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def get_plid(barcode):
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PLID = [0] * 4
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if len(barcode) != 17:
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return PLID
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id_value = int(barcode[2:7]) + (int(barcode[7:12]) << 16)
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PLID[0] = (id_value >> 8) & 0xFF
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PLID[1] = id_value & 0xFF
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PLID[2] = (id_value >> 24) & 0xFF
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PLID[3] = (id_value >> 16) & 0xFF
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return PLID
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def make_ping_frame(PLID, repeats):
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frame = make_raw_frame(0x85, PLID, 0x17)
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frame.append(0x01)
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frame.append(0x00)
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frame.append(0x00)
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frame.append(0x00)
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for b in range(0, 22):
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frame.append(0x01)
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terminate_frame(frame, repeats)
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return frame
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def make_refresh_frame(PLID):
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frame = make_mcu_frame(PLID, 0x01)
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for b in range(0, 22):
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frame.append(0x00)
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terminate_frame(frame, 1)
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return frame
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