Can someone tell me how to make a timer in KL27Z microcontroller so that it starts to count the seconds? Thank you in advance

vivekgarg — Wed, 24 Aug 2016 10:00:56 GMT

I want to make a timer in KL27Z using Kinetis development studio and have no idea how to make it. Could someone help me in this problem?

Re: Can someone tell me how to make a timer in KL27Z microcontroller so that it starts to count the seconds? Thank you in advance

ivadorazinova — Tue, 13 Sep 2016 11:34:42 GMT

Hi Vivek.

Please refer to PIT example, which is part of KSDK.

The PIT project is a simple demonstration program of the SDK PIT driver. It sets up the PIT
hardware block to trigger a periodic interrupt after every 1 second. When the PIT interrupt is triggered
a message a printed on the UART terminal and an LED is toggled on the board.

#include "fsl_debug_console.h"
#include "board.h"
#include "fsl_pit.h"

#include "pin_mux.h"
#include "clock_config.h"
/*******************************************************************************
* Definitions
******************************************************************************/
#define PIT_LED_HANDLER PIT_IRQHandler
#define PIT_IRQ_ID PIT_IRQn
/* Get source clock for PIT driver */
#define PIT_SOURCE_CLOCK CLOCK_GetFreq(kCLOCK_BusClk)
#define LED_INIT() LED_RED_INIT(LOGIC_LED_ON)
#define LED_TOGGLE() LED_RED_TOGGLE()

/*******************************************************************************
* Prototypes
******************************************************************************/

/*******************************************************************************
* Variables
******************************************************************************/

volatile bool pitIsrFlag = false;

/*******************************************************************************
* Code
******************************************************************************/
void PIT_LED_HANDLER(void)
{
    /* Clear interrupt flag.*/
    PIT_ClearStatusFlags(PIT, kPIT_Chnl_0, PIT_TFLG_TIF_MASK);
    pitIsrFlag = true;
}

/*!
* @brief Main function
*/
int main(void)
{
/* Structure of initialize PIT */
pit_config_t pitConfig;

/* Initialize and enable LED */
LED_INIT();

    /* Board pin, clock, debug console init */
    BOARD_InitPins();
    BOARD_BootClockRUN();
    BOARD_InitDebugConsole();

    /*
     * pitConfig.enableRunInDebug = false;
     */
    PIT_GetDefaultConfig(&pitConfig);

/* Init pit module */
PIT_Init(PIT, &pitConfig);

/* Set timer period for channel 0 */
PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, USEC_TO_COUNT(1000000U, PIT_SOURCE_CLOCK));

/* Enable timer interrupts for channel 0 */
PIT_EnableInterrupts(PIT, kPIT_Chnl_0, kPIT_TimerInterruptEnable);

/* Enable at the NVIC */
EnableIRQ(PIT_IRQ_ID);

    /* Start channel 0 */
    PRINTF("\r\nStarting channel No.0 ...");
    PIT_StartTimer(PIT, kPIT_Chnl_0);

    while (true)
    {
        /* Check whether occur interupt and toggle LED */
        if (true == pitIsrFlag)
        {
            PRINTF("\r\n Channel No.0 interrupt is occured !");
            LED_TOGGLE();
            pitIsrFlag = false;
        }
    }
}

I hope this helps you.

Best Regards,

Iva

topic Re: Can someone tell me how to make a timer in KL27Z microcontroller so that it starts to count the seconds? Thank you in advance in Kinetis Microcontrollers

Can someone tell me how to make a timer in KL27Z microcontroller so that it starts to count the seconds? Thank you in advance

Re: Can someone tell me how to make a timer in KL27Z microcontroller so that it starts to count the seconds? Thank you in advance