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sparkfun / SparkFun_MPU-9250-DMP_Arduino_Library

Arduino library for the MPU-9250 enabling its digital motion process (DMP) features.
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Strange reset behaviour #16

Closed Yury-MonZon closed 5 years ago

Yury-MonZon commented 6 years ago

It works as intended after the first sketch upload. After that if I unplug usb cable thus cutting the both devices power and plug back - the fun starts here) The sketch is working, but this time the response from mpu9250 is like 10 times slower. Here is the weird part - it still works, but just shows the data slower in Serial Monitor and the led blinks slower.

What am I doing wrong? Thanks.

Yury-MonZon commented 6 years ago

The fix found - wrong bootloader was flashed in the Arduino Pro Micro chip. Had to reflash it using AVR ISP mk2 and Arduino IDE. So if you got something like and your board is not genuine SparkFun Pro Micro - then reflash the bootloader.