mirror of https://github.com/irmen/ksim65.git
35 lines
1.0 KiB
Kotlin
35 lines
1.0 KiB
Kotlin
package razorvine.ksim65.components
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import razorvine.ksim65.IHostInterface
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/**
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* Simple keyboard for text entry.
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* The keyboard device itself takes care of decoding the keys,
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* this device simply produces the actual keys pressed.
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* There's NO support right now to detect keydown/keyup events or the
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* state of the shift/control/function keys.
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*
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* reg. value
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* ---- ---------
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* 00 character from keyboard, 0 = no character/key pressed
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*/
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class Keyboard(startAddress: Address, endAddress: Address, private val host: IHostInterface) :
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MemMappedComponent(startAddress, endAddress) {
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init {
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require(endAddress-startAddress+1 == 1) { "keyboard needs exactly 1 memory byte" }
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}
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override fun clock() {}
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override fun reset() {}
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override operator fun get(offset: Int): UByte {
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return when (offset) {
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0x00 -> host.keyboard()?.code?.toShort() ?: 0
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else -> 0xff
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}
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}
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override operator fun set(offset: Int, data: UByte) { /* read-only device */ }
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}
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