[DO NOT MERGE] initial SPI DMA IMU driver (mpu9250) for testing/review/discussion#10602

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dagar wants to merge 12 commits intomasterfrom pr-mpu9250_spidma

+2,114-3,535

Commits on Oct 18, 2018

WIP: NuttX SPI DMA
dagar
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initial commit over accel, gyro, and mag driver base classes

Jake Dahl
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dagar
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initial commit of module base multi

Jake Dahl
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dagar
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inital commit, still does not support i2c

Jake Dahl
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dagar
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did some more work, added calibration stuff, we still need to figure out the device ID and how best to handle calibration

Jake Dahl
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dagar
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tested this a bit better and fixed the bugs I found. This still needs more testing + clean up + a good review

Jake Dahl
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dagar
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added some debug stuff, attempting to get calibration and ioctl to work

Jake Dahl
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dagar
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attempting to get calibration to work, feeling lost

Jake Dahl
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dagar
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Added a check for the i2c bus mpu9250 device. Changed the 9250 startup command in rc.sensors

Jake Dahl
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dagar
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mpu9250 misc cleanup (clang-tidy, posix fixes, header split)
dagar
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updated the IMU base class files. These are close to done.

Jake Dahl
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dagar
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updated the imu/mpu9250 files. I flight tested this and am seeing really bad noise on the gyro.

Jake Dahl
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dagar
committed