driver_pit.c File Reference

Provides a simple abstraction for a periodic interval timer. More...

#include "issdk_hal.h"
#include "board.h"
#include "fsl_pit.h"
#include "pin_mux.h"
#include "clock_config.h"

Include dependency graph for driver_pit.c:

Go to the source code of this file.

Macros
#define	PIT_LED_HANDLER   PIT0_IRQHandler
#define	PIT_IRQ_ID   PIT0_IRQn
#define	PIT_SOURCE_CLOCK   CLOCK_GetFreq(kCLOCK_BusClk)

Functions
void	PIT_LED_HANDLER (void)
void	pit_init (uint32_t microseconds)

Variables
volatile bool	pitIsrFlag = false

Detailed Description

Provides a simple abstraction for a periodic interval timer.

Bare metal implementations of the sensor fusion library require at least one periodic interrupt for use as a timebase for sensor fusion functions. The Periodic Interval Timer (PIT) is one such module that is commonly found on NXP Kinetis MCUs. The PIT functions are only referenced at the main() level. There is no interaction within the fusion routines themselves.

Definition in file driver_pit.c.

Macro Definition Documentation

PIT_IRQ_ID

#define PIT_IRQ_ID   PIT0_IRQn

Definition at line 31 of file driver_pit.c.

Referenced by pit_init().

PIT_LED_HANDLER

#define PIT_LED_HANDLER   PIT0_IRQHandler

Definition at line 28 of file driver_pit.c.

PIT_SOURCE_CLOCK

#define PIT_SOURCE_CLOCK   CLOCK_GetFreq(kCLOCK_BusClk)

Definition at line 33 of file driver_pit.c.

Referenced by pit_init().

Function Documentation

pit_init()

void pit_init

(

uint32_t

microseconds

)

Definition at line 44 of file driver_pit.c.

References BUS_CLK_FREQ, CTIMER, PIT_IRQ_ID, and PIT_SOURCE_CLOCK.

PIT_LED_HANDLER()

void PIT_LED_HANDLER

(

void

)

Definition at line 37 of file driver_pit.c.

References pitIsrFlag.

Variable Documentation

pitIsrFlag

volatile bool pitIsrFlag = false

Definition at line 35 of file driver_pit.c.

Referenced by PIT_LED_HANDLER().