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key press instructions

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Jairinho 2022-02-28 13:00:58 -03:00
parent 232661bbbe
commit 43c17693a9
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GPG Key ID: 954589B18A21D5B6
2 changed files with 18 additions and 0 deletions
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2
chip8/chip8.go
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@ -129,7 +129,9 @@ func (emulator *Emulator) Cycle() {
case 0xE: case 0xE:
switch instruction & 0x00FF { switch instruction & 0x00FF {
case 0x9E: // SKP Vx case 0x9E: // SKP Vx
emulator.SkipKeyPressed(x)
case 0xA1: // SKNP Vx case 0xA1: // SKNP Vx
emulator.SkipKeyNotPressed(x)
} }
case 0xF: case 0xF:
switch instruction & 0x00FF { switch instruction & 0x00FF {

16
chip8/instructions.go
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@ -227,3 +227,19 @@ func (emulator *Emulator) Draw(x uint8, y uint8, n uint8) {
} }
} }
} }
// Skip next instruction if key with the value of Vx is pressed.
//
// Checks the keyboard, and if the key corresponding to the value of Vx
// is currently in the down position, PC is increased by 2.
func (emulator *Emulator) SkipKeyPressed(x uint8) {
// TODO: implement input
}
// Skip next instruction if key with the value of Vx is not pressed.
//
// Checks the keyboard, and if the key corresponding to the value of Vx
// is currently in the up position, PC is increased by 2.
func (emulator *Emulator) SkipKeyNotPressed(x uint8) {
// TODO: implement input
}