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kyuhyong
kyuhyong
Visitor II
June 7, 2015
Question

On STM32F103, Encoder Input and Input capture at the same TIM3 available?

  • June 7, 2015
  • 3 replies
  • 1136 views
Posted on June 07, 2015 at 03:36

Hello,

My STM32F103 is working as motor driver and work with pwm as an input runs at about 500hz or 2 ms duty.

An incremental encoder is connected as a speed reference of the motor output.

Pin connection is as follows.

Encoder A --> PA6 (TIM3_CH1)

Encoder B --> PA7 (TIM3_CH2)

PWM1 in  --> PB0 (TIM3_CH3)

PWM2 in  --> PB1 (TIM3_CH4)

I already tested encoder function successful however input capture seems not to work.  

I just want to know if this configuration is correct.

Thanks,

Kyu

#pwm #encoder #stm32f103
This topic has been closed for replies.

3 replies

Tesla DeLorean
Tesla DeLorean
Guru
June 7, 2015
Posted on June 07, 2015 at 03:56

There is only one counting element in the timer, you have it going up/down via the encoder. You can Input Capture those values, but it's probably not going to be helpful measuring unrelated signals.

You'll need to use a different timer.

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waaizkhan
waaizkhan
Associate II
June 7, 2015
Posted on June 07, 2015 at 19:35

jpeacock
jpeacock
Associate
June 7, 2015
Posted on June 07, 2015 at 20:01

Since the timer is in encoder mode any capture has to be based on a change in the encoder timer, which in this case is either phase A or B depending on your setup.  You PWM measurements would have to be clocked from an encoder phase in order to work.

  Jack Peacock

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