292 of 307
ZBasic System Library 282 ZX Microcontroller Family UpdateRTC Type Subroutine Invocation UpdateRTC(fastTicks) Parameter Method Type Description fastTicks ByVal int16 The number of fast ticks to add to the RTC. Discussion This subroutine can be used to update the RTC with the number of fast ticks missed during a long operation performed with interrupts disabled. In order to determine the number of fast ticks that are missed, your code must periodically check the interrupt flag of the RTC timer and, if it is set, increment a local counter value and then reset the interrupt flag. Example ' This example is for ZX devices that use Timer0 for the RTC timer. Atomic Dim missedTicks as UnsignedInteger Const TickFlag as Byte = &H02 missedTicks = 0 Do ' place code here that performs one iteration of a ' long process and eventually exits the loop ' check the RTC flag, reset it If (CBool(Register.TIFR0 And TickFlag)) Then missedTicks = missedTicks + 1 Register.TIFR0 = TickFlag End If Loop Call UpdateRTC(missedTicks) Call Yield() End Atomic See Also Yield