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
