cancel
Showing results for 
Search instead for 
Did you mean: 

STM32F446 How to use CubeMX to config TIM2 in PWM Input Mode for speed measure (prep for Simulink)

Thomasch
Associate

For speed measure of a dc-motor we want to capture the pwm-period as described here: Solved: I have a timer set up to measure the input pwm period ... ,
I will use TIM2 and set up to 'PWM Input on CH1', with channel_1 read pwm-period, channel_2 read pulse width (Pin: PA6), the motor encoder gives 100 ticks per rotation and runs with max 3000 rpm,

Additional, when the input signal is stopped (dc-motor don't run), the capture registers has to reset to 0 (to indicate frequency=speed=0),

Questions: How to do all the nessesary configurations right in CubeMX? The lab experiments runs later directly from Matlab 2022B / Simulink.
And how can I use TIM2 CH3 to do the reset stuff as described in tread and how to config the right trigger?

pic1 TIM2 Mode and Configuration.jpg

Ty in advance.

This discussion is locked. Please start a new topic to ask your question.
1 REPLY 1
Thomasch
Associate

For testing I do following steps:

1. Step: config TIM1 as 'PWM Generation', 400Hz, Pin PA8

pic 1 Timer 1 Mode and Configuration (PWM 400Hz).jpg

2. Step: config TIM2 as Combined Channels 'PWM Input on CH1', PSC=1, Pin PB8

pic 2 Timer 2 Mode and Configuration (PWM Input on CH1).jpg

Then running the Simulink Model in real time gives wrong value from TIM2_CH1: 1024,
pic 5 Simulink TIM2 b.jpg
Any kind of help would be appreciated! Thanks