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Sample code to count the external input signal using counter.

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ansh11

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I have stm32f4xx discovery board and atollic compiler

I am looking sample code to count external digital input signal

I have been tried some code but couldn't get success

anybody have working code or can help me to get sample code
 

KlausST

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Hi,

We don't know the frequency, nor the desired bit width of the counter...
Nor do we know whether you want the hardware to count pulses, or per software via interrupt, or software using polling mode.

I'd use a timer/counter.
Just set up an input as counter clock.
And set up the timer/counter periferal.
No counting software needed.

Don't ask others to provide software in this forum. Show your documented code and we will help you to rectify the problem.

Klaus
 

andre_teprom

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I have been tried some code but couldn't get success
anybody have working code or can help me
WRONG value, or NO value?
 

ansh11

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Hi,

We don't know the frequency, nor the desired bit width of the counter...
Nor do we know whether you want the hardware to count pulses, or per software via interrupt, or software using polling mode.Klaus

I am new for STM32F407 board
The system clock. in link https://sites.google.com/site/johnkneenmicrocontrollers/clocks/clk407

The STM32F407 microcontroller system clock can come from one of three sources:

The input to the PLL will be either HSI or HSE
For the STM32F407 used in the Discovery board HSI = 16MHz.
For the STM32F407 used in the Discovery board HSE = 8MHz.

I want to use hardeare counter to count external pulses
 

andre_teprom

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I have been tried some code but couldn't get success
So far you did not show any code.
Obviously, we`re expecting to see your code instead of redirect links.
 

Akanimo

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Show the code you wrote before do your mistakes can be pointed out. You also have to consider a lot of other things. For instance, if the pulses are generated by means of a switch, then you have to use some denouncing technique...and so on.

Give a clear description of how the signal is generated and how it is supplied to.the microcontroller.
 

ansh11

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So far you did not show any code.
Obviously, we`re expecting to see your code instead of redirect links.
following are the example code

Code:
/**


/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F4_Discovery_Peripheral_Examples
  * @{
  */

/** @addtogroup SysTick_Example
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStructure;
static __IO uint32_t TimingDelay;

/* Private function prototypes -----------------------------------------------*/
void Delay(__IO uint32_t nTime);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief   Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f4xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
        system_stm32f4xx.c file
     */     
       
  /* Initialize Leds mounted on STM32F4-Discovery board */
  STM_EVAL_LEDInit(LED4);
  STM_EVAL_LEDInit(LED3);
  STM_EVAL_LEDInit(LED5);
  STM_EVAL_LEDInit(LED6);

  /* Turn on LED4 and LED5 */
  STM_EVAL_LEDOn(LED4);
  STM_EVAL_LEDOn(LED5);

  /* Setup SysTick Timer for 1 msec interrupts.
     ------------------------------------------
    1. The SysTick_Config() function is a CMSIS function which configure:
       - The SysTick Reload register with value passed as function parameter.
       - Configure the SysTick IRQ priority to the lowest value (0x0F).
       - Reset the SysTick Counter register.
       - Configure the SysTick Counter clock source to be Core Clock Source (HCLK).
       - Enable the SysTick Interrupt.
       - Start the SysTick Counter.
    
    2. You can change the SysTick Clock source to be HCLK_Div8 by calling the
       SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8) just after the
       SysTick_Config() function call. The SysTick_CLKSourceConfig() is defined
       inside the misc.c file.

    3. You can change the SysTick IRQ priority by calling the
       NVIC_SetPriority(SysTick_IRQn,...) just after the SysTick_Config() function 
       call. The NVIC_SetPriority() is defined inside the core_cm4.h file.

    4. To adjust the SysTick time base, use the following formula:
                            
         Reload Value = SysTick Counter Clock (Hz) x  Desired Time base (s)
    
       - Reload Value is the parameter to be passed for SysTick_Config() function
       - Reload Value should not exceed 0xFFFFFF
   */
  if (SysTick_Config(SystemCoreClock / 1000))
  { 
    /* Capture error */ 
    while (1);
  }

  while (1)
  {
    /* Toggle LED3 and LED6 */
    STM_EVAL_LEDToggle(LED3);
    STM_EVAL_LEDToggle(LED6);

    /* Insert 50 ms delay */
    Delay(50);

    /* Toggle LED4 and LED5 */
    STM_EVAL_LEDToggle(LED4);
    STM_EVAL_LEDToggle(LED5);

    /* Insert 100 ms delay */
    Delay(100);
  }
}

/**
  * @brief  Inserts a delay time.
  * @param  nTime: specifies the delay time length, in milliseconds.
  * @retval None
  */
void Delay(__IO uint32_t nTime)
{ 
  TimingDelay = nTime;

  while(TimingDelay != 0);
}

/**
  * @brief  Decrements the TimingDelay variable.
  * @param  None
  * @retval None
  */
void TimingDelay_Decrement(void)
{
  if (TimingDelay != 0x00)
  { 
    TimingDelay--;
  }
}

#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
I want to modified code to count external event. I have one digital sensor that count object so when 100 count complete ring alaram

There are other way to do but I want to use only hardware timer for this purpose so when timer goes from 0 to 100 alram should be ring

main aim to learn counter of stm32f4xx
 

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