LAUNCHXL-F28069M: How do i implement the index pulse from the encoder?

Miguel cosmes

Other Parts Discussed in Thread: LAUNCHXL-F28069M, DRV8301, LVSERVOMTR

Hello everyone,
I want to implement the encoder index pulse, I need it because I want every start up of the motor, the shaft of the rotor to be positioned in the same position (mechanical angle) no matter where it stayed after the last time it was turned on, or if there is another way I will be very grateful if you let me know.
I'm using 2 lvservomtr and launchxl-f28069m with 2 drv8301.

over 8 years ago

0 Yanming Luo over 8 years ago

TI__Guru** 115440 points

You can link a external interrupt to gpio input of index, or check IEL bit flag of QFLG register in a high frequency timer.

0 Miguel cosmes over 8 years ago in reply to Yanming Luo

Intellectual 310 points

Thanks for your suggestion Yanming, what happens is I already have 2 interruptions, one for each motor, Do I have to modify the code that controls the cpu time for each interruption?

0 Yanming Luo over 8 years ago in reply to Miguel cosmes

TI__Guru** 115440 points

You can enable two interrupts in the same time, but the motor control interrupt is high priority, you need to control the both ISRs execute time to avoid CPU time overflow.

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LAUNCHXL-F28069M: How do i implement the index pulse from the encoder?