using a timer to count pulses on STM32F7

[spa23]

Posted on November 08, 2017 at 10:50

Hi 

I have a question about using a timer to count pulses form a encoder (only one pin) I don't care about the direction.

I'm trying to use Timer 3, but I'm not sure how to set it up in CubeMx.

I start it with: 

HAL_TIM_Base_Start( mpEncoderTim );

And read with: 

count = mpEncoderTim->Instance->CNT;

Hope anyone of you, have done this before, so you can give me a hint 

thanks in advance and best regards

panduro..

#stm32f7-timer

[waclawek.jan]

Posted on November 08, 2017 at 11:03

On TIM13 you can't - it does not have the slave mode controller needed for external counting modes.

Look into RM, search for SMCR register, look at its SMS field.

JW

[spa23]

Posted on November 08, 2017 at 11:17

sorry for my mistake I meant Timer 3

[waclawek.jan]

Posted on November 08, 2017 at 11:40

I don't use CubeMX nor Cube.

You want to set TIMx_ARR (I guess it's what is called there 'period') to nonzero.

JW

[spa23 · Accepted solution]

Posted on November 08, 2017 at 13:22

I think I solved the case.

Counter Period was 0 :(