MacintoshKeyboardRemapper/Keyboard.ino
2019-10-16 22:26:42 +02:00

98 lines
2.7 KiB
C++

void send_data_to_kbd(byte data, kbd_state next_state) {
if (!kbd_clock_detected) {
pinMode(DATA_KBD, OUTPUT);
digitalWrite(DATA_KBD, LOW);
kbd_clock_read = digitalRead(CLK_KBD);
if (kbd_clock_read == LOW) {
kbd_clock_detected = true;
kbd_clock_state=LOW;
} else {
check_kbd_clock_start();
return;
}
}
digitalWrite(DATA_KBD, data>>(7 - kbd_clock_count) & 1);
kbd_clock_read = digitalRead(CLK_KBD);
if (kbd_clock_read != kbd_clock_state) {
kbd_clock_transition_start = 0;
kbd_clock_state = kbd_clock_read;
if (kbd_clock_state == LOW) {
kbd_clock_count++;
}
if (kbd_clock_state == HIGH && kbd_clock_count == 7) {
digitalWrite(DATA_KBD, HIGH);
kbd_reset();
keyboard_state = next_state;
}
} else {
check_clock_transition();
}
}
void read_data_from_kbd(kbd_state next_state) {
if (!kbd_clock_detected) {
pinMode(DATA_KBD, INPUT);
kbd_clock_read = digitalRead(CLK_KBD);
if (kbd_clock_read == LOW) {
kbd_clock_detected = true;
kbd_clock_state=LOW;
} else {
check_kbd_clock_start();
return;
}
}
kbd_clock_read = digitalRead(CLK_KBD);
if (kbd_clock_read != kbd_clock_state) {
kbd_clock_transition_start = 0;
kbd_clock_state = kbd_clock_read;
if (kbd_clock_state == HIGH) {
if (digitalRead(DATA_KBD) == HIGH) {
kbd_data_read |= 1<<(7 - kbd_clock_count);
}
}
if (kbd_clock_state == LOW) {
kbd_clock_count++;
}
if (kbd_clock_state == HIGH && kbd_clock_count == 7) {
if (keyboard_state == READ_MODEL_NUMBER) {
model_number = kbd_data_read;
} else if (kbd_data_read != TEST_ACK && kbd_data_read != TEST_NAK) {
kbd_last_data_read_index = (kbd_last_data_read_index + 1) % KBD_BUFFER_SIZE;
kbd_last_data_read[kbd_last_data_read_index] = kbd_data_read;
}
/*if (kbd_data_read != NULL_TRANSITION && kbd_data_read != TEST_ACK) {
Serial.print("Data read: ");
Serial.println(kbd_data_read, BIN);
}*/
kbd_reset();
keyboard_state = next_state;
}
} else {
check_clock_transition();
}
}
void check_kbd_clock_start() {
if (kbd_clock_start == 0) {
kbd_clock_start = millis();
} else if (millis() - kbd_clock_start >= CLOCK_START_MSEC) {
//Serial.println("Failed to receive clock signal, resetting");
kbd_hard_reset();
}
}
void check_clock_transition() {
if (kbd_clock_transition_start == 0) {
kbd_clock_transition_start = micros();
} else if (micros() - kbd_clock_transition_start >= CLOCK_TRANSITION_USEC) {
//Serial.println("Failed to receive proper clock signal, resetting");
kbd_hard_reset();
}
}