Struct circuit_playground_express::SYST

pub struct SYST { /* fields omitted */ }

SysTick: System Timer

Methods

impl SYST

pub fn clear_current(&mut self)

Clears current value to 0

After calling clear_current(), the next call to has_wrapped() will return false.

pub fn disable_counter(&mut self)

Disables counter

pub fn disable_interrupt(&mut self)

Disables SysTick interrupt

pub fn enable_counter(&mut self)

Enables counter

NOTE The reference manual indicates that:

"The SysTick counter reload and current value are undefined at reset, the correct initialization sequence for the SysTick counter is:

• Program reload value
• Clear current value
• Program Control and Status register"

The sequence translates to self.set_reload(x); self.clear_current(); self.enable_counter()

pub fn enable_interrupt(&mut self)

Enables SysTick interrupt

pub fn get_clock_source(&mut self) -> SystClkSource

Gets clock source

NOTE This takes &mut self because the read operation is side effectful and can clear the bit that indicates that the timer has wrapped (cf. SYST.has_wrapped)

pub fn get_current() -> u32

Gets current value

pub fn get_reload() -> u32

Gets reload value

pub fn get_ticks_per_10ms() -> u32

Returns the reload value with which the counter would wrap once per 10 ms

Returns 0 if the value is not known (e.g. because the clock can change dynamically).

pub fn has_reference_clock() -> bool

Checks if an external reference clock is available

pub fn has_wrapped(&mut self) -> bool

Checks if the counter wrapped (underflowed) since the last check

NOTE This takes &mut self because the read operation is side effectful and will clear the bit of the read register.

pub fn is_counter_enabled(&mut self) -> bool

Checks if counter is enabled

NOTE This takes &mut self because the read operation is side effectful and can clear the bit that indicates that the timer has wrapped (cf. SYST.has_wrapped)

pub fn is_interrupt_enabled(&mut self) -> bool

Checks if SysTick interrupt is enabled

NOTE This takes &mut self because the read operation is side effectful and can clear the bit that indicates that the timer has wrapped (cf. SYST.has_wrapped)

pub fn is_precise() -> bool

Checks if the calibration value is precise

Returns false if using the reload value returned by get_ticks_per_10ms() may result in a period significantly deviating from 10 ms.

pub fn set_clock_source(&mut self, clk_source: SystClkSource)

Sets clock source

pub fn set_reload(&mut self, value: u32)

Sets reload value

Valid values are between 1 and 0x00ffffff.

NOTE To make the timer wrap every N ticks set the reload value to N - 1

impl SYST

pub fn ptr() -> *const RegisterBlock

Returns a pointer to the register block

Trait Implementations

impl Send for SYST

impl Deref for SYST

type Target = RegisterBlock

The resulting type after dereferencing.

fn deref(&self) -> &<SYST as Deref>::Target

Dereferences the value.