driver_pit.h File Reference

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Functions
void	pit_init (uint32_t microseconds)

Variables
volatile bool	pitIsrFlag

Detailed Description

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.h.

Function Documentation

void pit_init

(

uint32_t

microseconds

)

Definition at line 62 of file driver_pit.c.

Referenced by main().

{
    /* initialize PIT */
    pit_config_t    pitConfig;                  // Declare KSDK PIT configuration structure
    PIT_GetDefaultConfig(&pitConfig);           // Fill out that structure with defaults
    PIT_Init(PIT, &pitConfig);                  // PIT is declared by the KSDK
    // We choose to use Channel 0 of the PIT.  That can obviously be changed
    PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, USEC_TO_COUNT(microseconds, PIT_SOURCE_CLOCK));
    PIT_EnableInterrupts(PIT, kPIT_Chnl_0, kPIT_TimerInterruptEnable);
    EnableIRQ(PIT_IRQ_ID);
    PIT_StartTimer(PIT, kPIT_Chnl_0);
}

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Variable Documentation

volatile bool pitIsrFlag

Definition at line 53 of file driver_pit.c.

Referenced by main(), and PIT_LED_HANDLER().