Controlling servo motor by PWM from F28069

Prathamesh dhanpalwar

Other Parts Discussed in Thread: CONTROLSUITE

Hello,

I need to control a servo motor that has pulse duration from 0.9mS to 2.1mS with 1.5mS as center. The pulse refreshes at 50Hz (20mS). Is the dead band the only way? and how can I use it?

over 12 years ago

0 ChrisClearman over 12 years ago

TI__Guru** 118350 points

you are trying to create a control signal that varies between 0.9 and 2.1 ms with a frequency of 20 ms...but the pulse has to be centered around 1.5ms?

If you tried to do this with a 16b PWM up-down timer for 20 ms = 1,000,000 counts of 50 MHz...it couldn't be done. With the 32-bit eCAP working as a PWM though you have plenty of resolution....you could also probably do this with a SW GPIO pretty easily.

0 Prathamesh dhanpalwar over 12 years ago in reply to ChrisClearman

Intellectual 450 points

Hello Chris,

Can you let me know how can I do this?

Regards-

Prathamesh

0 ChrisClearman over 12 years ago in reply to Prathamesh dhanpalwar

TI__Guru** 118350 points

follow the example in controlSUITE. you will need to configure your 20ms and edge triggers

C:\ti\controlSUITE\device_support\f2803x\v125\DSP2803x_examples_ccsv4\ecap_apwm

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Controlling servo motor by PWM from F28069