MPU6886::calibrateAccelGyro() failure

[mhaberler]

Hi, trying Calibrated_sensor_output.ino with an esp32 and an MPU6886

MPU6886::calibrateAccelGyro() fails to read back the FIFO sample count here - the readBytes() request is NAK'd, hence fifo_count is zero, resulting in a divide-by-zero here

not sure what to do about it, short from replacing gyro calibration with averaging

thanks! Michael

ps: using Platformio, esp_wrover_kit 4.1 with JTAG, Salea LA versions are:

Platform espressif32 @ 6.1.0 (required: espressif32)
├── framework-arduinoespressif32 @ 3.20007.0 (required: platformio/framework-arduinoespressif32 @ ~3.20007.0)
├── tool-cmake @ 3.16.4 (required: platformio/tool-cmake @ ~3.16.0)
├── tool-esptoolpy @ 1.40500.0 (required: platformio/tool-esptoolpy @ ~1.40500.0)
├── tool-mkfatfs @ 2.0.1 (required: platformio/tool-mkfatfs @ ~2.0.0)
├── tool-mklittlefs @ 1.203.210628 (required: platformio/tool-mklittlefs @ ~1.203.0)
├── tool-mkspiffs @ 2.230.0 (required: platformio/tool-mkspiffs @ ~2.230.0)
├── tool-ninja @ 1.9.0 (required: platformio/tool-ninja @ ^1.7.0)
├── tool-openocd-esp32 @ 2.1100.20220706 (required: platformio/tool-openocd-esp32 @ ~2.1100.0)
├── toolchain-esp32ulp @ 1.23500.220830 (required: platformio/toolchain-esp32ulp @ ~1.23500.0)
├── toolchain-riscv32-esp @ 8.4.0+2021r2-patch5 (required: espressif/toolchain-riscv32-esp @ 8.4.0+2021r2-patch5)
└── toolchain-xtensa-esp32 @ 8.4.0+2021r2-patch5 (required: espressif/toolchain-xtensa-esp32 @ 8.4.0+2021r2-patch5)

[LiquidCGS]

Very late response as I don't get notifications for issues for some reason. it seems like the FIFO_EN bits are set up wrong as they're set up for the 6500's FIFO which is very slightly different, and that's making it not start up the FIFO.

If you disable calibration does it at least output anything?

I'll make a fix soonish, I don't have an mpu6886 to test at the moment.

[bobobo1618]

I'm having the same problem. When I remove the calibration, I get data but they're extremely noisy.

[LiquidCGS]

I'll see if I can get my hands on an MPU6886 again to properly fix that IMU.

[floBik]

Please check if my PR #25 solves this Issue. It works for me, but I'm not sure if the calibration is working properly now.