Setting I2C to 400kHz/1ms fixed occasional errors on my Vue3

[murrayma]

I'd suggest updating the vue3 recommendations to 400kHz/1ms as well.

I tried 400kHz/1ms on my vue3 as suggested here esphome/issues#6335 (comment) and that stopped the occasional errors I saw. I had spent some time last month poking around to debug the error. I added more logging to the sensor update callback. Specifically with 200kHz/default, EmporiaVueComponent::update() occasionally aborts because sensor_reading.end != 0. I'm guessing this is a race condition? While the I2C read() always returns success, the databuffer occasionally has different kinds of garbage in it.

The hexdump is the contents of the databuffer array. Sometimes it's complete, sometimes it isn't. The counters in the log message I added are: total, is a count of how many times EmporiaVueComponent::update() has been called, good is a count of how many times sensor_read.end == 0 was true, and new is a count of how many times !sensor_reading.is_unread.

[01:56:50][W][component:238]: Components should block for at most 30 ms. 
[01:58:33][E][emporia_vue:064]: Failed to read from sensor due to a malformed reading, should end in null bytes but is 65535 (total 30049, good 30018, new 7630)
[01:58:33][E][emporia_vue:071]: 0077520b 7319ffff 3ff70000 19b8ffff
[01:58:33][E][emporia_vue:071]: 2f000000 d3ffffff fdffffff 90ffffff
[01:58:33][E][emporia_vue:071]: 6f000000 00000000 7b0b0000 94f4ffff
[01:58:33][E][emporia_vue:071]: ffffffff 29180000 e8e7ffff faffffff
[01:58:33][E][emporia_vue:071]: d7f9d1ff 95e42d00 21070000 69543200
[01:58:33][E][emporia_vue:071]: cbddcdff b5f9ffff 1dedffff c9120000
[01:58:33][E][emporia_vue:071]: 00000000 08f8ffff ef070000 f9ffffff
[01:58:33][E][emporia_vue:071]: 580c0000 b5f3ffff ffffffff 1ffcffff
[01:58:33][E][emporia_vue:071]: db030000 feffffff 3c0fffff 3bff0000
[01:58:33][E][emporia_vue:071]: eeb4ffff 2323ffff 22eb0000 b7bbffff
[01:58:33][E][emporia_vue:071]: 8a19ffff a5f30000 96bbffff ec11ffff
[01:58:33][E][emporia_vue:071]: 3bf70000 27b9ffff b508ffff c4080100
[01:58:33][E][emporia_vue:071]: bfb7ffff 6b34ffff 7ee20000 6db7ffff
[01:58:33][E][emporia_vue:071]: f82bffff dfe70000 cdb4ffff ad04ffff
[01:58:33][E][emporia_vue:071]: 99110100 6db7ffff b0189c18 0f004501
[01:58:33][E][emporia_vue:071]: a2000000 00500d00 0d002300 2300a812
[01:58:34][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[01:58:34][E][emporia_vue:077]: ffffffff ffffffff ffffffff
[01:58:34][W][component:237]: Component emporia_vue.sensor took a long time for an operation (109 ms).
[01:58:34][W][component:238]: Components should block for at most 30 ms. 
[02:01:01][E][emporia_vue:064]: Failed to read from sensor due to a malformed reading, should end in null bytes but is 65535 (total 31188, good 31156, new 7919)
[02:01:01][E][emporia_vue:071]: 00141414 14141414 14141414 14141414
[02:01:01][E][emporia_vue:071]: 14141414 14141414 14141414 14141414
[02:01:01][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:01][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:01:02][E][emporia_vue:077]: ffffffff ffffffff ffffffff
[02:01:02][W][component:237]: Component emporia_vue.sensor took a long time for an operation (106 ms).
[02:01:02][W][component:238]: Components should block for at most 30 ms. 
[02:06:20][E][emporia_vue:064]: Failed to read from sensor due to a malformed reading, should end in null bytes but is 65535 (total 33635, good 33602, new 8540)
[02:06:20][E][emporia_vue:071]: 00ffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:071]: ffffffff ffffffff ffffffff ffffffff
[02:06:20][E][emporia_vue:077]: ffffffff ffffffff ffffffff

[Ocramius]

Setting to 400Khz led to a bunch of I2C errors for me:

[15:30:11][E][emporia_vue:048]: Failed to read from sensor due to I2C error 3

[BluThunder2k]

Don't forget the
frequency: 400kHz
timeout: 1ms

Without that Timeout mine thru thousands of those error 3's.

[gpete]

Thanks @BluThunder2k and @murrayma , I too was having that error 3 with 200kHz set but no timeout. I had just updated a 2024.10 ESPHome version to 2024.11. It went away when I changed it to 400kHz and added the timeout. I tested it with 200kHz but added timeout and still had error 3s, same with 400kHz with no timeout. So it really did take the 2 together for the error 3s to stop filling my logs.