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docs: Added instructions how to configure I2C for MPU-9250 

Signed-off-by: Dmitry Butyugin <dmbutyugin@google.com>
This commit is contained in:
Dmitry Butyugin 2022-06-16 23:19:30 +02:00 committed by KevinOConnor
parent f2e27ae05e
commit 8804c1578d
2 changed files with 12 additions and 1 deletions
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4
docs/Measuring_Resonances.md
View File

@ -115,7 +115,9 @@ probe_points:
It is advised to start with 1 probe point, in the middle of the print bed,
slightly above it.
For the MPU-9250:
For the MPU-9250, make sure the Linux I2C driver is enabled and the baud rate is
set to 400000 (see [Enabling I2C](RPi_microcontroller.md#optional-enabling-i2c)
section for more details). Then, add the following to the printer.cfg:
```
[mcu rpi]
serial: /tmp/klipper_host_mcu

9
docs/RPi_microcontroller.md
View File

@ -69,6 +69,15 @@ Make sure the Linux SPI driver is enabled by running
`sudo raspi-config` and enabling SPI under the "Interfacing options"
menu.
## Optional: Enabling I2C
Make sure the Linux I2C driver is enabled by running `sudo raspi-config`
and enabling I2C under the "Interfacing options" menu.
If planning to use I2C for the MPU accelerometer, it is also required
to set the baud rate to 400000 by: adding/uncommenting
`dtparam=i2c_arm=on,i2c_arm_baudrate=400000` in `/boot/config.txt`
(or `/boot/firmware/config.txt` in some distros).
## Optional: Identify the correct gpiochip
On Raspberry Pi and on many clones the pins exposed on the GPIO belong