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| -rw-r--r-- | docs/Measuring_Resonances.md | 4 | ||||
| -rw-r--r-- | docs/RPi_microcontroller.md | 9 |
2 files changed, 12 insertions, 1 deletions
diff --git a/docs/Measuring_Resonances.md b/docs/Measuring_Resonances.md index 53a60013..7f41bd4d 100644 --- a/docs/Measuring_Resonances.md +++ b/docs/Measuring_Resonances.md @@ -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 diff --git a/docs/RPi_microcontroller.md b/docs/RPi_microcontroller.md index 7551d4f1..2e64650c 100644 --- a/docs/RPi_microcontroller.md +++ b/docs/RPi_microcontroller.md @@ -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 |