driver_systick.c File Reference

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Macros
#define	SYST_CSR   SysTick->CTRL
#define	SYST_RVR   SysTick->LOAD
#define	SYST_CVR   SysTick->VAL

Functions
void	ARM_systick_enable (void)
void	ARM_systick_start_ticks (int32 *pstart)
int32	ARM_systick_elapsed_ticks (int32 start_ticks)
void	ARM_systick_delay_ms (uint32 iSystemCoreClock, uint32 delay_ms)

Macro Definition Documentation

#define SYST_CSR   SysTick->CTRL

Definition at line 38 of file driver_systick.c.

Referenced by ARM_systick_enable().

#define SYST_CVR   SysTick->VAL

Definition at line 40 of file driver_systick.c.

Referenced by ARM_systick_elapsed_ticks(), and ARM_systick_start_ticks().

#define SYST_RVR   SysTick->LOAD

Definition at line 39 of file driver_systick.c.

Referenced by ARM_systick_elapsed_ticks(), and ARM_systick_enable().

Function Documentation

void ARM_systick_delay_ms	(	uint32	iSystemCoreClock,
		uint32	delay_ms
	)

Definition at line 75 of file driver_systick.c.

Referenced by initializeFusionEngine().

{
    int32 istart_ticks; // start ticks on entry
    int32 ielapsed_ticks;   // elapsed ticks
    int16 i;        // loop counter

    // loop for requested number of ms
    for (i = 0; i < delay_ms; i++)
    {
        // loop until 1ms has elapsed
        ARM_systick_start_ticks(&istart_ticks);
        do
        {
            ielapsed_ticks = ARM_systick_elapsed_ticks(istart_ticks);
        } while (ielapsed_ticks < iSystemCoreClock / 1000);
    }

    return;
}

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int32 ARM_systick_elapsed_ticks

(

int32

start_ticks

)

Definition at line 64 of file driver_systick.c.

Referenced by ARM_systick_delay_ms(), and fFuseSensors().

{
    int32 elapsed_ticks;

    // subtract the stored start ticks and check for wraparound down through zero
    elapsed_ticks = start_ticks - (SYST_CVR & 0x00FFFFFF);
    if (elapsed_ticks < 0) elapsed_ticks += SYST_RVR;

    return elapsed_ticks;
}

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void ARM_systick_enable

(

void

)

Definition at line 47 of file driver_systick.c.

Referenced by initializeFusionEngine().

{
    SYST_CSR = 0x5u;        // enable systick from internal clock
    SYST_RVR = 0x00FFFFFFu; // set reload to maximum 24 bit value
    return;
}

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void ARM_systick_start_ticks

(

int32 *

pstart

)

Definition at line 55 of file driver_systick.c.

Referenced by ARM_systick_delay_ms(), and fFuseSensors().

{
    // store the 24 bit systick timer
    *pstart = SYST_CVR & 0x00FFFFFF;

    return;
}

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