132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
const int statePin = 3; // Connect LattePanda's S3 pin to Arduino's D3
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const int resetPin = 4; // Connect LattePanda's RST pin to Arduino's D4
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const int D10 = 10;
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const int D11 = 11;
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const int D12 = 12;
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bool watchdogActive = false;
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unsigned long lastReceivedTime;
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unsigned long currentTime;
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bool lastLEDState = LOW;
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unsigned long lastLEDTime;
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unsigned long currentLEDTime;
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void setup()
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{
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite (LED_BUILTIN, LOW);
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lastLEDTime = millis ();
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pinMode(statePin, INPUT); // Set as input to read the state pin's level
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pinMode(resetPin, INPUT); // By default, the RST pin on LattePanda is 3.3V. Initialize Arduino pin as INPUT to match this level.
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pinMode(D10, OUTPUT);
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pinMode(D11, OUTPUT);
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pinMode(D12, OUTPUT);
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Serial.begin(9600);
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}
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void loop()
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{
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//-- Check to see if it's time to change the LED state.
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currentLEDTime = millis ();
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if (currentLEDTime > lastLEDTime) //-- Check for millis overflow
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{
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if (currentLEDTime - lastLEDTime > 1000U)
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{
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if (lastLEDState == LOW)
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{
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digitalWrite (LED_BUILTIN, HIGH);
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lastLEDState = HIGH;
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}
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else
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{
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digitalWrite (LED_BUILTIN, LOW);
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lastLEDState = LOW;
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}
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lastLEDTime = millis ();
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}
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}
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else
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lastLEDTime = currentLEDTime;
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// Check if the watchdog should be activated
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if (digitalRead (statePin) == HIGH)
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{
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if (Serial.available () > 0)
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{
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char receivedChar = Serial.read ();
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if (receivedChar == 'A')
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{
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watchdogActive = true;
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lastReceivedTime = millis();
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}
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else if (receivedChar == 'Q')
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{
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watchdogActive = false;
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}
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else if (receivedChar == '0')
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{
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digitalWrite (D10, LOW);
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digitalWrite (D11, LOW);
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digitalWrite (D12, LOW);
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}
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else if (receivedChar == '1')
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{
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digitalWrite (D10, LOW);
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digitalWrite (D11, LOW);
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digitalWrite (D12, LOW);
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digitalWrite (D10, HIGH);
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}
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else if (receivedChar == '2')
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{
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digitalWrite (D10, LOW);
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digitalWrite (D11, LOW);
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digitalWrite (D12, LOW);
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digitalWrite (D11, HIGH);
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}
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else if (receivedChar == '3')
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{
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digitalWrite (D10, LOW);
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digitalWrite (D11, LOW);
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digitalWrite (D12, LOW);
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digitalWrite (D10, HIGH);
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digitalWrite (D11, HIGH);
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}
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else if (receivedChar == '4')
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{
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digitalWrite (D10, LOW);
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digitalWrite (D11, LOW);
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digitalWrite (D12, LOW);
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digitalWrite (D12, HIGH);
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}
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}
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}
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else
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{
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watchdogActive = false;
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}
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// If watchdog is active and 's' character isn't received within 1 minute, reboot LattePanda board
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currentTime = millis ();
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if (currentTime > lastReceivedTime) //-- Check for millis overflow and wait for the next cycle if it has
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{
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if (watchdogActive && (currentTime - lastReceivedTime > 60000U))
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{
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pinMode(resetPin,OUTPUT); // Set pin to OUTPUT mode
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digitalWrite(resetPin, LOW); // Pull down the RST pin to reboot the LattePanda board
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delay(50); // Maintain a LOW level for 50ms
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pinMode(resetPin, INPUT); // Set pin back to INPUT mode to match default 3.3V level of LattePanda's RST pin
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watchdogActive = false; // Stop the watchdog function after rebooting the LattePanda board
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}
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}
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}
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