Wrong encoding on the serial port? [Scratchbook]

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====== Wrong encoding on the serial port? ====== What we get with the logic analyzer: <code> Time [s],Value,Parity Error,Framing Error 0.591529000000000,W (0x57),, 0.592088833333333,+ (0x2B),, 0.592720333333333,1 (0x31),, 0.593911750000000,9 (0x39),, 0.594445583333333,. (0x2E),, 0.595435166666667,6 (0x36),, 0.595978750000000,0 (0x30),, 0.596512583333333,0 (0x30),, 0.597056250000000,0 (0x30),, 0.597658416666667,0 (0x30),, 0.598202083333333,0 (0x30),, 0.598735916666667,0 (0x30),, 0.599289250000000,N (0x4E),, 0.599901250000000,3 (0x33),, 0.600483916666667,2 (0x32),, 0.601017750000000,3 (0x33),, 0.601587416666667,0 (0x30),, 0.602147333333333,0 (0x30),, 0.602681166666667,. (0x2E),, 0.603315916666667,1 (0x31),, 0.603869250000000,N (0x4E),, 0.604406416666667,? (0x3F),, 0.604940250000000,? (0x3F),, 0.605474083333333,? (0x3F),, 0.606007916666667,? (0x3F),, 0.606541750000000,? (0x3F),, 0.607075583333333,? (0x3F),, 0.607658333333333,? (0x3F),, 0.608192166666667,? (0x3F),, 0.608726000000000,? (0x3F),, 0.609259833333333,? (0x3F),, 0.609793666666667,? (0x3F),, 0.610327500000000,? (0x3F),, 0.610858083333333,? (0x3F),, 0.611392000000000,? (0x3F),, 0.611984416666667,2 (0x32),, 0.612531250000000,0 (0x30),, 0.613074916666667,0 (0x30),, 0.613608750000000,5 (0x35),, 0.614142583333333,'3' (0x03),, </code> What arrives at /dev/ttyAMA0: <code> <Buffer 00 54 6a 9d 00 63 34 00 ec f6 f6 f6 f6 f6 66 4b a6 96 e6 e6 36 f3 66 2b 2c 2c 4c 58 58 18 60 60 60 60 60 60 60 60 b3 f6 56 96> </code> I'm connecting using the same parameters as the decoder in the logic analyzer; baudrate 19200, databits 8, stopbits 1, parity none. ===== Horizontally represented: ===== <code> 00 54 6a 9d 00 63 34 ... </code> instead of <code> 57 2B 31 39 2E 36 ... </code> 57: W (start bit weather-data)\\ 2B 31 39 2E 36: +19.6° (temperature) It's sent directly as ASCII chars, hex encoded. Unfortunately, something went wrong in /dev/ttyAMA0. {{:sfera:weather-station.png?nolink|}}

sfera/serialport.1480944235.txt · Last modified: 2016/12/05 14:23 by claude

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