Struct atsam4sd32c_pac::SYST [−][src]
pub struct SYST { /* fields omitted */ }
Expand description
SysTick: System Timer
Implementations
Clears current value to 0
After calling clear_current()
, the next call to has_wrapped()
will return false
.
Disables counter
Disables SysTick interrupt
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()
Enables SysTick interrupt
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
)
Gets current value
Gets reload value
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).
Checks if an external reference clock is available
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.
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
)
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
)
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.
Sets clock source
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
Pointer to the register block
Returns a pointer to the register block (to be deprecated in 0.7)