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unit UsCounter

ti.mcu.cc23xx/UsCounter.em
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package ti.mcu.cc23xx

from em.hal import UsCounterI

import Mcu

module UsCounter: UsCounterI

end

def start()
    ^^SysTick->CTRL = (1 << SysTick_CTRL_CLKSOURCE_Pos) | (1 << SysTick_CTRL_ENABLE_Pos)^^
    ^^SysTick->LOAD = 0xFFFFFF^^
    ^^SysTick->VAL = 0^^
end

def stop()
    auto lr = <uint32>^^SysTick->LOAD^^
    auto vr = <uint32>^^SysTick->VAL^^
    auto dt = (((lr - vr) << 1) / (Mcu.mclkFrequency / 1000000)) >> 1
    ^^SysTick->CTRL = 0^^
    return dt
end