strategy for adding user code to pm_sensorless

steve robinson1

Other Parts Discussed in Thread: CONTROLSUITE

I have successfully integrated controller area network code with the pm_sensorless project of the DRV8312-C2-KIT (thankyou Brett Larimore). I can receive messages from the CAN bus and can send out messages too - I send the speed3.EstimatedSpeed variable value, for example.

I can still control the motor from the watch window using EnableFlag, lsw and speedRef.

I now want to set my motor speed from the incoming CAN value. On receipt of a CAN message, I tried setting the EnableFlag, lws and SpeedRef values that I usually use in the watch window, the motor did one kick and stopped!

Can you please tell me whether this strategy for adding user code to pm_sensorless is correct?

If it is OK, can you please let me know which variables I should be setting to get the motor to turn at different speeds and direction?

over 13 years ago

0 ChrisClearman over 13 years ago

TI__Guru** 119680 points

the variables and settings are in the documents you have reviewed.

are you connected only through CAN or do you also have a JTAG connection and CCS debug?

0 steve robinson1 over 13 years ago in reply to ChrisClearman

Prodigy 220 points

I am connected via the USB XDS100 emulation of the kit and CCS debug.

Please tell me which variables I must use to set the speed and direction of the motor?

0 ChrisClearman over 13 years ago in reply to steve robinson1

TI__Guru** 119680 points

the system documentation has this information

C:\ti\controlSUITE\development_kits\DRV8312-C2-KIT_v128\PM_Sensorless\~Docs\Sensorless FOC of PMSM.pdf

EnableFlag

SpeedRef

lsw

0 steve robinson1 over 13 years ago in reply to ChrisClearman

Prodigy 220 points

Chirs, thankyou for confirming that my strategy for adding Controller Area network routines to PM_sensorless was correct and that I need to work with the EnableFlag, SpeedRef and lsw variables to set the motor speed.

This leaves only the issue that, when I set these variables from the watch window, the motor spins OK, but, if I set them from within my code, the motor starts momentarily then stalls (My CAN read code runs in the C1 subroutine with the blinking led handler).

Any pointers?

0 ChrisClearman over 13 years ago in reply to steve robinson1

TI__Guru** 119680 points

unfortunately I'm not going to be much help at this point. seems like maybe memory has become corrupted? do you have everything running from RAM or have you moved some into flash?

0 steve robinson1 over 13 years ago in reply to ChrisClearman

Prodigy 220 points

Everything is in RAM. I have not learned how to put anything in flash yet! I am a beginner with this IDE.

Perhaps things will improve when I learn how to move code to flash?

0 ChrisClearman over 13 years ago in reply to steve robinson1

TI__Guru** 119680 points

are you sure your CAN stack isn't writing over your motor control code/data in RAM?

0 steve robinson1 over 13 years ago in reply to ChrisClearman

Prodigy 220 points

I can correctly send and receive CAN messages with the motor still and with the motor spinning after I have started it from changing the variables in the watch window.

It is only when I change these variables in code on receipt of a can message that the problem occurs.

0 Santosh Athuru over 13 years ago in reply to steve robinson1

TI__Mastermind 19810 points

Steve,

how are the variables defined? global , static, volatile, const...etc. and where the data section that contans the variables is linked to in your linker comamnd file?.

Best Regards

Santosh

C2000™︎ microcontrollers

C2000 microcontrollers forum

strategy for adding user code to pm_sensorless