MacintoshKeyboardRemapper/Macintosh.ino

159 lines
3.8 KiB
Arduino
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2019-09-27 22:15:00 +00:00
void mac_detect_ready_to_send_cmd() {
if (!mac_ready_detected) {
pinMode(DATA_MAC, INPUT);
if (digitalRead(DATA_MAC) == LOW) {
mac_ready_detected = true;
}
} else {
if (mac_delay_start == 0) {
mac_delay_start = micros();
}
if (micros() - mac_delay_start >= MAC_DETECT_READY_USEC) {
mac_reset();
macintosh_state = READ_CMD;
}
}
}
void mac_detect_ready_to_recv_data() {
if (mac_delay_start == 0) {
mac_delay_start = micros();
pinMode(DATA_MAC, INPUT);
}
if (micros() - mac_delay_start >= 400) {
if (digitalRead(DATA_MAC) == HIGH) {
macintosh_state = WRITE_DATA;
} else {
macintosh_state = DETECT_READY_FOR_CMD;
}
mac_reset();
}
}
void mac_read_data() {
if (!mac_clock_started) {
pinMode(DATA_MAC, INPUT);
mac_clock_state = LOW;
mac_clock_started = true;
}
if (mac_clock_state == LOW) {
if (mac_clock_delay_start == 0) {
digitalWrite(CLK_MAC, LOW);
mac_clock_delay_start = micros();
}
if (micros() - mac_clock_delay_start >= CLOCK_READ_LOW_USEC) {
mac_clock_state = HIGH;
mac_clock_delay_start = 0;
}
}
if (mac_clock_state == HIGH) {
if (mac_clock_delay_start == 0) {
digitalWrite(CLK_MAC, HIGH);
mac_clock_delay_start = micros();
if (digitalRead(DATA_MAC) == HIGH) {
mac_data_read |= 1<<(7 - mac_clock_count);
}
}
if (micros() - mac_clock_delay_start >= CLOCK_READ_HIGH_USEC) {
if (mac_clock_count < 7) {
mac_clock_state = LOW;
mac_clock_delay_start = 0;
mac_clock_count++;
} else {
last_mac_cmd = mac_data_read;
mac_reset();
macintosh_state = DETECT_READY_FOR_DATA;
}
}
}
}
void mac_write_data() {
if (!mac_clock_started) {
if (last_mac_cmd == INQUIRY_CMD && kbd_last_data_read_index == -1) {
if (mac_cmd_response_delay_start == 0) {
mac_cmd_response_delay_start = millis();
}
if (millis() - mac_cmd_response_delay_start >= MAC_RESP_DELAY_MSEC) {
goto WRITE_MAC;
} else {
return;
}
} else {
WRITE_MAC:
mac_data_write = mac_cmd_response_data();
if (mac_data_write == BAD_CMD) {
mac_reset();
macintosh_state = DETECT_READY_FOR_CMD;
return;
} else {
pinMode(DATA_MAC, OUTPUT);
mac_clock_state = LOW;
mac_clock_started = true;
}
}
}
if (mac_clock_state == LOW) {
if (mac_clock_delay_start == 0) {
digitalWrite(CLK_MAC, LOW);
mac_clock_delay_start = micros();
digitalWrite(DATA_MAC, mac_data_write>>(7 - mac_clock_count) & 1 > 0);
}
if (micros() - mac_clock_delay_start >= CLOCK_WRITE_LOW_USEC) {
mac_clock_state = HIGH;
mac_clock_delay_start = 0;
}
}
if (mac_clock_state == HIGH) {
if (mac_clock_delay_start == 0) {
digitalWrite(CLK_MAC, HIGH);
mac_clock_delay_start = micros();
}
if (micros() - mac_clock_delay_start >= CLOCK_WRITE_HIGH_USEC) {
if (mac_clock_count < 7) {
mac_clock_state = LOW;
mac_clock_delay_start = 0;
mac_clock_count++;
} else {
digitalWrite(DATA_MAC, HIGH);
mac_reset();
macintosh_state = DETECT_READY_FOR_CMD;
}
}
}
}
byte mac_cmd_response_data() {
switch (last_mac_cmd) {
case MODEL_NUMBER_CMD:
return model_number;
case TEST_CMD:
return TEST_ACK;
case INSTANT_CMD:
case INQUIRY_CMD:
if (kbd_last_data_read_index == -1) {
return NULL_TRANSITION;
}
byte inquiry_data = kbd_last_data_read[0];
kbd_last_data_read[0] = kbd_last_data_read[1];
kbd_last_data_read[1] = kbd_last_data_read[2];
kbd_last_data_read[2] = kbd_last_data_read[3];
kbd_last_data_read_index -= 1;
return remap(inquiry_data);
}
}