<![CDATA[OSError: I2C bus error(19)]]>Today suddenly stoped working I2C devices on port A.
After coding session (Wave file playing from SD, developed on c++), I flashed (M5Burner updated to 2.3.0) the UIFlow 1.7.5core2 with well debuged UI application with ENV2 and SGP30 sensors connected through GROVE HUB. At first I got "ENV2 unit not found" while it was connected. Reconnection and cable exchange gave nothing. Core2 did not see ENV2 sensor plugged in PortA through GROVE Hub or Directly.
Could somebody give any suggestions?

]]>https://community.m5stack.com/topic/3264/oserror-i2c-bus-error-19RSS for NodeWed, 29 Apr 2026 11:29:24 GMTThu, 06 May 2021 17:43:33 GMT60<![CDATA[Reply to OSError: I2C bus error(19) on Fri, 14 May 2021 19:03:57 GMT]]>Hello @xxxa0c

you are welcome. Glad to hear you got it working again. And thank you for reporting back.

Cheers
Felix

]]>https://community.m5stack.com/post/13789https://community.m5stack.com/post/13789Fri, 14 May 2021 19:03:57 GMT<![CDATA[Reply to OSError: I2C bus error(19) on Fri, 14 May 2021 15:08:00 GMT]]>GREAT THANKS, Felix! Obviously I turned I2C off during I2S programming session. After I had included the UIblock, that you specified, my sensors and I2C returned to life.

]]>https://community.m5stack.com/post/13787https://community.m5stack.com/post/13787Fri, 14 May 2021 15:08:00 GMT<![CDATA[Reply to OSError: I2C bus error(19) on Thu, 13 May 2021 16:00:14 GMT]]>Hello @xxxa0c

yes, it is possible to turn it on/off programmatically.

UIFlow: Hardwares - Power - Set bus power mode Disable/Enable M-Bus 5V output

Arduino: last parameter of M5.begin()

void begin(bool LCDEnable = true, bool SDEnable = true, bool SerialEnable = true, bool I2CEnable = false, mbus_mode_t mode = kMBusModeOutput);

Thanks
Felix

P.S. I believe it should be on by default though.

]]>https://community.m5stack.com/post/13776https://community.m5stack.com/post/13776Thu, 13 May 2021 16:00:14 GMT<![CDATA[Reply to OSError: I2C bus error(19) on Thu, 13 May 2021 14:24:13 GMT]]>I measured voltage on 5V line on I2C PortA and found that it is 0. Is it possible to turn it off\on programmatically on it is a DCDC malfunction? (It is strange, Core 2 only 3 months old)

]]>https://community.m5stack.com/post/13775https://community.m5stack.com/post/13775Thu, 13 May 2021 14:24:13 GMT