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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). # Default is 104 (0x68).
#i2c_mcu: #i2c_mcu:
#i2c_bus: #i2c_bus:
#i2c_speed: #i2c_speed: 400000
# See the "common I2C settings" section for a description of the # 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 #axes_map: x, y, z
# See the "adxl345" section for information on this parameter. # 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 It is generally recommended to only use i2c devices that are on the
same printed circuit board as the micro-controller. 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: #i2c_address:
# The i2c address of the device. This must specified as a decimal # The i2c address of the device. This must specified as a decimal