systick.h — Maple v0.0.11 Documentation

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# `systick.h`

[Stub] support.

## Library Documentation

> Various system timer definitions.

> Defines

> > SYSTICK_BASE

> >   SysTick register map base pointer.

> > SYSTICK_CSR_COUNTFLAG

> > SYSTICK_CSR_CLKSOURCE

> > SYSTICK_CSR_CLKSOURCE_EXTERNAL

> > SYSTICK_CSR_CLKSOURCE_CORE

> > SYSTICK_CSR_TICKINT

> > SYSTICK_CSR_TICKINT_PEND

> > SYSTICK_CSR_TICKINT_NO_PEND

> > SYSTICK_CSR_ENABLE

> > SYSTICK_CSR_ENABLE_MULTISHOT

> > SYSTICK_CSR_ENABLE_DISABLED

> > SYSTICK_CVR_NOREF

> > SYSTICK_CVR_SKEW

> > SYSTICK_CVR_TENMS

> Functions

> > uint32 systick_uptime(void )

> >   Returns the system uptime, in milliseconds.

> > void systick_init(uint32 reload_val)

> >   Initialize and enable SysTick.

> >   Clocks the system timer with the core clock, turns it on, and enables interrupts.

> >   Parameters:

> >   - `reload_val` -

> >     Appropriate reload counter to tick every 1 ms.

> > void systick_disable()

> >   Clock the system timer with the core clock, but don’t turn it on or enable interrupt.

> > void systick_enable()

> >   Clock the system timer with the core clock and turn it on; interrupt every 1 ms, for systick_timer_millis.

> > uint32 systick_get_count(void )

> >   Returns the current value of the SysTick counter.

> > uint32 systick_check_underflow(void )

> >   Check for underflow.

> >   This function returns 1 if the SysTick timer has counter to 0 since the last time it was called. However, any reads of any part of the SysTick Control and Status Register SYSTICK_BASE->CSR will interfere with this functionality. See the ARM Cortex M3 Technical Reference Manual for more details (e.g. Table 8-3 in revision r1p1).

> Variables

> > uint32 systick_uptime_millis

> >   System elapsed time, in milliseconds.

> class systick_reg_map

> > SysTick register map type.

> > Public Members

> > > __io uint32 CSR

> > >   Control and status register.

> > > __io uint32 RVR

> > >   Reload value register.

> > > __io uint32 CNT

> > >   Current value register (“count”).

> > > __io uint32 CVR

> > >   Calibration value register.

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