Hello All, Maybe a bit off-topic. But just in case someone would have faced to this strange behavior of a Raspberry i2c address map.
Rpi4-1: usual address map from 0x03 to 7x76.
Config.:
Weewx 4.10.2,
Bresser 7in1,
sdr driver,
RTC clock (UU),
BME280 (0x76) (pressure, temperature, humidity)
AS3935 (0x03) (lightning detector)
Weewx on Rpi4-1 running without any error.
pi@weewx:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: 03 -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- 1a -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
70: -- -- -- -- -- -- 76 --
pi@weewx:~ $
Rpi4-2: "abnormal" map with addresses 0x03 to 0x07 non selectable.
Config.:
Weewx 5.0.2,
Bresser 7in1,
RTC clock (UU),
AS3935 (??)
Weewx on Rpi4-2 failing : File "/etc/weewx/bin/user/as3935.py", line 182,
in __init__GPIO.setup(self.pin, GPIO.IN (see log below)
pi@raspberrypi:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- 1a -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pi@raspberrypi:~ $
Clearly, the AS3935 is not identified because the 0x03 to 0x07 address
range is not active. This AS3935 module works on the Rpi4-1
Any idea on where this problem of misconfiguration could come from,
firmware, kernel ?
Is there a way to reset the I2c address map ?
Thanks,
Pierre-Yves
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I2c-address-map-bug-log
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