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Encoder interface

Question asked by vinh.trinh on Nov 21, 2012
Latest reply on Nov 23, 2012 by joee
Hi everybody!
I have a problem when i reading data from ENCODER to stm32f103rc. My code is in the following:
/*      */
#include "stm32f10x.h"
#include <stdio.h>
#include "main.h"
#include "stm32f10x_it.h"
#include "stm32f10x_tim.h" 

GPIO_InitTypeDef GPIO_InitStructure;
/* *****************  */
PUTCHAR_PROTOTYPE
{
     /* Place your implementation of fputc here */
     /* e.g. write a character to the USART */
     USART_SendData(USART1, (uint8_t) ch);


     /* Loop until the end of transmission */
     while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
     {}
     return ch;
}
void Delay(__IO uint32_t num)
{
     __IO uint32_t index = 0;
     /* default system clock is 72MHz */
     for(index = (720000 * num); index != 0; index--)
     {
     }
}
void USART_Configuration(void)
{
  //     /* USARTx configured as follow:
  //      - BaudRate = 115200 baud  
  //     - Word Length = 8 Bits
  //    - One Stop Bit
  //    - No parity
  //   - Hardware flow control disabled (RTS and CTS signals)
  //    - Receive and transmit enabled
       USART_InitTypeDef USART_InitStructure;
     USART_InitStructure.USART_BaudRate = 115200;
     USART_InitStructure.USART_WordLength = USART_WordLength_8b;
     USART_InitStructure.USART_StopBits = USART_StopBits_1;
     USART_InitStructure.USART_Parity = USART_Parity_No;
     USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
     USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;     
     USART_ClearFlag(USART2,USART_FLAG_TC);
     /* USART configuration */
     USART_Init(USART1, &USART_InitStructure);
     USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
     //enable Receive Data register not empty interrupt
     USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
     /* Enable USART */
     USART_Cmd(USART1, ENABLE);     
}
void RCC_Configuration(void)
{
    /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  
    initialize the PLL and update the SystemFrequency variable. */
    //SystemInit();


    /* Enable GPIOB clocks */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); 
}
void Encoder(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
//GPIO_InitTypeDef GPIO_InitStructure;
//RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 0x0FFF;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_EncoderInterfaceConfig(TIM2,TIM_EncoderMode_TI1,TIM_ICPolarity_Falling,
TIM_ICPolarity_Falling);
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_SetCounter(TIM2, 3200);
TIM_Cmd(TIM2, ENABLE);

}

void GPIO_Configuaration(void)
{
        /* Configure PA9 for USART Tx as alternate function push-pull */
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOA, &GPIO_InitStructure);
     /* Configure PA10 for USART Rx as input floating */
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOA, &GPIO_InitStructure);     
     /* encoder config*/
     GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}
int main(void)
{
     uint16_t temp;
    /* Configure the system clocks */
    RCC_Configuration();    
    //Timer4_Configuration();
    Encoder();
     //GPIO_Remap_Configuration();
     GPIO_Configuaration();
     USART_Configuration();
    while (1)
    {
        temp=TIM_GetCounter(TIM2);
        printf("Gia tri encoder: %d\n",temp);
          Delay(5);
     }
}




     
     






#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)

  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */


     /* Infinite loop */
     while (1)
     {
     }
}
#endif

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