| 3200/5200 communication protocol | |
| I. Overview: | |
| The control command generally adopts the command line method, and the communication rate is 57600. The command is issued by the PC, analyzed and executed by the machine, and then the result is returned to the PC. The end character of each command is a newline character, which is represented by \n in C language (hexadecimal representation is 0x0a), and the different commands are explained below. | |
| Two instruction categories: | |
| 1. s command: the function is used to set parameters | |
| The command format is as follows: | |
| English colon (:) + s + channel number (1 or 2) + command | |
| The following command formats take 1-channel operation as an example |
| #!/usr/bin/env python3 | |
| """ | |
| pi@raspberrypi:~ $ ./i2cdetect.py | |
| 0 1 2 3 4 5 6 7 8 9 a b c d e f | |
| 00: -- -- -- -- -- -- -- -- | |
| 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- -- | |
| 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
IERS ref: https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat
Alternate: https://www.ietf.org/timezones/data/leap-seconds.list
| IERS | date | LS | NTP | NTP-1900 | NTP-1970 | NTP-2000 | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| MJD | d | m | y | ls | y-m-d | ls | days | seconds | seconds | seconds |
| 41317.0 | 1 | 1 | 1972 | 10 | 1972-01-01 | 10 | 26297 | 2272060800 | 63072000 | -883612800 |
| 41499.0 | 1 | 7 | 1972 | 11 | 1972-07-01 | 11 | 26479 | 2287785600 | 78796800 | -867888000 |
| import time | |
| def time1_mktime(tm): | |
| t = time.mktime(tm) | |
| if tm[0]<MPY_MJD: t -= 2**32 # date < MicroPython epoch => previous u32 era !!! | |
| return t | |
| # https://developers.google.com/time/smear |
| # Value of TAI-UTC in second valid beetween the initial value until | |
| # the epoch given on the next line. The last line reads that NO | |
| # leap second was introduced since the corresponding date | |
| # Updated through IERS Bulletin 63 issued in January 2022 | |
| # | |
| # | |
| # File expires on 28 December 2022 | |
| # | |
| # | |
| # MJD Date TAI-UTC (s) |