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About Terenceang

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  • Birthday 04/15/1968

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  1. Looks great... let me know how it is working for you.
  2. the IMU is working and pretty stable. but the motion seem to have some dampening effect at the end, if you bank 45 degrees, it will go to 40 degree then slowly go to 45... have to study more to figure out why.. maybe the sampleing rate or some time related maths. code is updated!!
  3. Hi Tim, add an event counter in the breakpoint window and set breakpoint between the instructions you want to count, enable and disable the counter to reset. you can find the instructions in the FPU lab segment in the Stellaris tutorial, Cheers, Terence.
  4. ok, everything is working fine, except some how after the fix, pitch and roll is mixing into each other's axis. rechecking all the axis.
  5. eliminated the inverse sqaure root issue. 1.0f / sqrtf(x) instead. 104 cycles with fpu, 150 cycles without fpu, 107 with fast invsqrt routine.
  6. thanks now i understand it better..
  7. 1. Bluehash-----------------2--------------------US 2. Gwdeveloper-----------1---------------------US 3. Reaper7-----------------1---------------------PL 4. DanAndDusty-----------1--------------------UK 5. JKabat--------------------2--------------------US 6. PentiumPC---------------1--------------------SG
  8. @Darmurg, you might want to check this out. runs ont the 430. http://invensense.com/mems/gyro/documents/PB-MPU-9150IMF%20MotionFit%20Wireless%20Developer%20Kit%20Product%20Brief.pdf
  9. I tot of STMF32F3, similar setup as the PX4, maybe easier to port.. @Fred, if you have time to look at the code, I am getting running error on the Roll axis, and after fixing the update rate to 100Hz. I am getting some scaling error. I will look at it again this week end.
  10. https://code.google.com/p/stellaris-lp-imu/source/browse/#svn%2Ftrunk%2Fstellaris-lp-imu the code is for UART1. not updated to use the UI. Please update us with you mocap experiment, thanks.
  11. I am making changes to regulate the timing for the AHRS updates.. All this is pretty new to me, I am getting good Yaw and Pitch reading but roll is way off, It goes 1 way and won't return to level after awhile, seem to accumulate some error over time.
  12. That is my exact set up, just change the code from UART0 to UART1 if you use this LP booster, I have it mounted on the bottom of the Stellaris. you got to check the truck for the source. https://code.google.com/p/stellaris-lp-imu/source/browse/#svn%2Ftrunk%2Fstellaris-lp-imu
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