TIM_encodermode_TI1 - why doesnot it count ?

[mehmet.karakaya]

Posted on December 28, 2010 at 15:15

TIM_encodermode_TI1 - why doesnot it count ?

#encoder #timer

[lowpowermcu]

Posted on May 17, 2011 at 14:19

Hi mehmet,

Is the RCC and GPIO well configured for TIM4 ?

Can you give us your configuration so perhaps I can help you.

Herzlich,

 

MCU Lüfter

[mehmet.karakaya]

Posted on May 17, 2011 at 14:19

Hello MCU Lüfter , I think I discovered a bug in STM32  :)

I checked the signals, everything is fine with my circuit

the problem is no matter what encoder mode is selected

the Timer counts only phase shifted A B encoder mode

I mean I selected TIM_EncoderMode_TI1 and TIM_EncoderMode_TI2

the timer counted only when I simulated phase shifted A B signals

on the CH1 and CH2 inputs

[mehmet.karakaya]

Posted on May 17, 2011 at 14:19

hello thank you , here are the routines I wrote

---------------------------

void TIM4init(void) {

  TIM_TimeBaseStructure.TIM_Period = 0xffff;

  TIM_TimeBaseStructure.TIM_Prescaler = 0;

  TIM_TimeBaseStructure.TIM_ClockDivision = 0;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  TIM_EncoderInterfaceConfig(TIM4,TIM_EncoderMode_TI1,TIM_ICPolarity_Rising,TIM_ICPolarity_Rising );

  TIM_Cmd(TIM4, ENABLE);

    TIM4->CNT=0; } ------------------------------

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_8|GPIO_Pin_7|

                                GPIO_Pin_6|GPIO_Pin_5;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_Init(GPIOB, &GPIO_InitStructure);

------------------------------

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

------------------------------

and in the main loop

{

  int16_t *RAMptr=&RAM[DATAWORDS+500*2];  

  *RAMptr= TIM4->CNT; }

I can watch the *RAMptr in the PC with my comunication program, no problem there

I tried to give pulse PB6 , direction PB7 and vice versa - no counting ( they are TIM4_CH1 & CH2 )

( btw I have STM32F103RC )

[lowpowermcu]

Posted on May 17, 2011 at 14:19

Hi mehmet,

Your config looks fine.

Check that the encoder interface signals are toggling and well connected to PB6 and PB7.

Good luck.

Herzlich,

 

MCU Lüfter