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docs: Note mcu types with i2c_speed support in Config_Reference.md 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2022-06-20 12:58:05 -04:00
parent 8804c1578d
commit 52a8afba43
1 changed files with 11 additions and 2 deletions
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docs/Config_Reference.md
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@ -1536,9 +1536,9 @@ number of sections with an "mpu9250" prefix).
# Default is 104 (0x68).
#i2c_mcu:
#i2c_bus:
#i2c_speed:
#i2c_speed: 400000
# See the "common I2C settings" section for a description of the
# above parameters.
# above parameters. The default "i2c_speed" is 400000.
#axes_map: x, y, z
# See the "adxl345" section for information on this parameter.
```
@ -4224,6 +4224,15 @@ support for error recovery varies between each micro-controller type.
It is generally recommended to only use i2c devices that are on the
same printed circuit board as the micro-controller.
Most Klipper micro-controller implementations only support an
`i2c_speed` of 100000. The Klipper "linux" micro-controller supports a
400000 speed, but it must be
[set in the operating system](RPi_microcontroller.md#optional-enabling-i2c)
and the `i2c_speed` parameter is otherwise ignored. The Klipper
"rp2040" micro-controller supports a rate of 400000 via the
`i2c_speed` parameter. All other Klipper micro-controllers use a
100000 rate and ignore the `i2c_speed` parameter.
```
#i2c_address:
# The i2c address of the device. This must specified as a decimal