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Use BACK state; accept other ACKs at any time.

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This commit is contained in:
Thomas Harte 2024-03-23 21:02:35 -04:00
parent 55f92e2411
commit 0e07f802ac
1 changed files with 37 additions and 31 deletions
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68
Machines/Acorn/Archimedes/Keyboard.hpp
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@ -17,9 +17,13 @@ struct Keyboard {
Keyboard(HalfDuplexSerial &serial) : serial_(serial) {}
void set_key_state(int row, int column, bool is_pressed) {
// if(!scan_keyboard_) return;
// TODO: scan_keyboard_ seems to end up in the wrong state. Investigate.
if(!scan_keyboard_) return;
// Don't waste bandwidth on repeating facts.
if(states_[row][column] == is_pressed) return;
states_[row][column] = is_pressed;
// Post new key event.
const uint8_t prefix = is_pressed ? 0b1100'0000 : 0b1101'0000;
enqueue(static_cast<uint8_t>(prefix | row), static_cast<uint8_t>(prefix | column));
consider_dequeue();
@ -43,6 +47,14 @@ struct Keyboard {
}
switch(phase_) {
case Phase::ExpectingACK:
if(input != NACK && input != SMAK && input != MACK && input != SACK) {
reset();
break;
}
phase_ = Phase::Idle;
[[fallthrough]];
case Phase::Idle:
switch(input) {
case RQID: // Post keyboard ID.
@ -58,14 +70,29 @@ struct Keyboard {
enqueue(0, 0);
break;
case NACK:
scan_keyboard_ = scan_mouse_ = false;
break;
case SMAK:
scan_keyboard_ = scan_mouse_ = true;
break;
case MACK:
scan_keyboard_ = false;
scan_mouse_ = true;
break;
case SACK:
scan_keyboard_ = true;
scan_mouse_ = false;
break;
default:
if((input & 0b1111'0000) == 0b0100'0000) {
// RQPD; request to echo the low nibble.
serial_.output(KeyboardParty, 0b1110'0000 | (input & 0b1111));
}
if(!(input & 0b1111'1000)) {
} else if(!(input & 0b1111'1000)) {
// LEDS: should set LEd outputs.
} else {
reset();
}
break;
}
@ -94,32 +121,9 @@ struct Keyboard {
reset();
break;
}
dequeue_next();
phase_ = Phase::ExpectingACK;
break;
case Phase::ExpectingACK:
switch(input) {
default:
reset();
break;
case NACK:
scan_keyboard_ = scan_mouse_ = false;
break;
case SMAK:
scan_keyboard_ = scan_mouse_ = true;
break;
case MACK:
scan_keyboard_ = false;
scan_mouse_ = true;
break;
case SACK:
scan_keyboard_ = true;
scan_mouse_ = false;
break;
}
phase_ = Phase::Idle;
break;
}
consider_dequeue();
@ -127,14 +131,16 @@ struct Keyboard {
}
void consider_dequeue() {
if(phase_ == Phase::Idle) {
dequeue_next();
if(phase_ == Phase::Idle && dequeue_next()) {
phase_ = Phase::ExpectingBACK;
}
}
private:
HalfDuplexSerial &serial_;
bool states_[16][16]{};
bool scan_keyboard_ = false;
bool scan_mouse_ = false;
enum class Phase {