HWA
Bare metal programming with style
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(systick,irq)
(systick,tenms)
(systick,onems)
According to PM0056, the _stka
class SysTick timer has a tenms
logical register that holds the factory calibration value for a 10 ms period.
In fact, for the STM32F103, the value of tenms
is 9000. Then, the calibration value minus 1 gives a 1 ms period (yes, ONE ms) when the SysTick is clocked at 9 MHz (72 MHz / 8).
For that reason, HWA also provides a onems
logical register that is the same as tenms
but maybe less confusing.