Encoder Problem

[navarro]

Posted on December 02, 2010 at 11:47

Encoder Problem

[mehmet.karakaya]

Posted on May 17, 2011 at 14:17

hello , do you have oscilloscope ?

can you look at the A B signals of encoder on the oscilloscope ?

( becouse I have the same code like you and I can read encoder with this code )

second ) is the compiler giving any warnings during compilation ?

[18278441]

Posted on May 17, 2011 at 14:17

Hi,Thiago Navarro

I copyed your code into my project and it works.Please check if your encoder working properly.By the way,there seems a strange problem with this code,though TIM2 is configed into COUNTUP mode,the TIM2->CNT value keeps decreasing instead of increasing.  

From: Thiago Navarro

Posted: Thursday, December 02, 2010 11:47 AM

Subject: Encoder Problem

Hey, I am trying to work this encoder interface, but I haven´t had good results. When I  debug my code , roll the encoder and watch the TIM2->CNT, its value is always (0 or 65535) or (0 or 1). Here is my code.

#include ''stm32f10x_conf.h''

#include ''misc.h''

void RCC_Configuration(void);

void GPIO_Configuration(void);

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

void TIM2init(void) {

  /* Time base configuration */

  TIM_TimeBaseStructure.TIM_Period = 0xffff;

  TIM_TimeBaseStructure.TIM_Prescaler = 0;

  TIM_TimeBaseStructure.TIM_ClockDivision = 0;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  TIM_EncoderInterfaceConfig(TIM2,TIM_EncoderMode_TI12,TIM_ICPolarity_Rising,TIM_ICPolarity_Rising );

  TIM_Cmd(TIM2, ENABLE);

}

void GPIO_Configuration(void)

{

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0 | GPIO_Pin_1;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void RCC_Configuration(void)

{

  /* TIM2 clock enable */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  /* GPIOC clock enable */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

}

int main (void){

RCC_Configuration();

GPIO_Configuration();

TIM2init();

while(1){

uint16_t current = TIM2->CNT;

}

}

If someone had any ideas, I will be very glad!!

thanks

[navarro]

Posted on May 17, 2011 at 14:17

Forget this last question, Of course its doesn´t matter!! I think everything can be a problem... =/

[navarro]

Posted on May 17, 2011 at 14:17

Hey, Thanks for the 

answers.

 I did what you said, but It look like to work normal. I do not understand why it is happening!!

There aren´t warnings in my code. Let I ask something... Do I have to roll in a fixed velocity?? Because I am rolling with my hand.

Thanks again!!

[navarro]

Posted on May 17, 2011 at 14:17

YEAHHHHHH!!! I got it!! I don´t why its worked but worked =] I only changed the TIM2 to TIM3 ( and the Pins ). Anybody knows why?!

Thanks =DD