mirror of https://github.com/irmen/ksim65.git
68 lines
1.8 KiB
Kotlin
68 lines
1.8 KiB
Kotlin
package razorvine.ksim65.components
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import java.time.LocalDate
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import java.time.LocalTime
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/**
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* A real-time time of day clock.
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* (System timers are elsewhere)
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*
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* reg. value
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* ---- ----------
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* 00 year (lsb)
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* 01 year (msb)
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* 02 month, 1-12
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* 03 day, 1-31
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* 04 hour, 0-23
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* 05 minute, 0-59
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* 06 second, 0-59
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* 07 millisecond, 0-999 (lsb)
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* 08 millisecond, 0-999 (msb)
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*/
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class RealTimeClock(startAddress: Address, endAddress: Address) : MemMappedComponent(startAddress, endAddress) {
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init {
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require(endAddress - startAddress + 1 == 9) { "rtc needs exactly 9 memory bytes" }
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}
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override fun clock() {
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/* not updated on clock pulse */
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}
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override fun reset() {
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/* never reset */
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}
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override operator fun get(address: Address): UByte {
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return when (address - startAddress) {
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0x00 -> {
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val year = LocalDate.now().year
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(year and 255).toShort()
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}
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0x01 -> {
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val year = LocalDate.now().year
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(year ushr 8).toShort()
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}
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0x02 -> LocalDate.now().monthValue.toShort()
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0x03 -> LocalDate.now().dayOfMonth.toShort()
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0x04 -> LocalTime.now().hour.toShort()
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0x05 -> LocalTime.now().minute.toShort()
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0x06 -> LocalTime.now().second.toShort()
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0x07 -> {
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val ms = LocalTime.now().nano / 1000
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(ms and 255).toShort()
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}
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0x08 -> {
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val ms = LocalTime.now().nano / 1000
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(ms ushr 8).toShort()
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}
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else -> 0xff
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}
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}
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override operator fun set(address: Address, data: UByte) {
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/* real time clock can't be set */
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}
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}
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