started rewriting the manual_control Arduino sketch

manual_control_new/manual_control_new.ino

@@ -0,0 +1,148 @@
+/*
+ * getMode function has been taken from https://forum.arduino.cc/t/check-current-pinmode/232140
+ */
+#define UNKNOWN_PIN 0xFF
+#define TX_PIN 1
+#define RX_PIN 0
+
+uint8_t getMode(uint8_t pin){
+  uint8_t bitmask = digitalPinToBitMask(pin);
+  uint8_t port = digitalPinToPort(pin);
+
+  // I don't see an option for mega to return this, but whatever...
+  if (port == NOT_A_PIN) return UNKNOWN_PIN;
+
+  // Is there a bit we can check?
+  if (bitmask == 0) return UNKNOWN_PIN;
+
+  // Is there only a single bit set?
+  if (bitmask & bitmask - 1) return UNKNOWN_PIN;
+
+  volatile uint8_t *reg, *out;
+  reg = portModeRegister(port);
+  out = portOutputRegister(port);
+
+  if (*reg & bitmask)
+    return OUTPUT;
+  else if (*out & bitmask)
+    return INPUT_PULLUP;
+  else
+    return INPUT;
+}
+
+uint8_t toggleState(uint8_t pin){
+  uint8_t mode = getMode(pin);
+  switch (mode){
+    case OUTPUT:
+      if (digitalRead(pin) == HIGH){
+        digitalWrite(pin, LOW);
+        return LOW;
+      } else {
+        digitalWrite(pin, HIGH);
+        return HIGH;
+      }
+    case INPUT_PULLUP:
+      pinMode(pin, INPUT);
+      return LOW;
+    case INPUT:
+      pinMode(pin, INPUT_PULLUP);
+      return HIGH;
+    default:
+      return UNKNOWN_PIN;
+  } 
+}
+
+uint8_t toogleMode(uint8_t pin){
+  uint8_t mode = getMode(pin);
+  // declared here bc it won’t let me inside the switch/case statement
+  uint8_t state;
+  switch (mode){
+    case OUTPUT:
+      state = digitalRead(pin);
+      pinMode(pin, INPUT);
+      digitalWrite(pin, state);
+      return getMode(pin); // probably sacrificed performance for readability here
+    case INPUT_PULLUP:
+      pinMode(pin, OUTPUT);
+      digitalWrite(pin, HIGH);
+      return OUTPUT;
+    case INPUT:
+      pinMode(pin, OUTPUT);
+      digitalWrite(pin, LOW);
+      return OUTPUT;
+    default:
+      return UNKNOWN_PIN;
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void setup(){
+  Serial.begin(115200);
+  // set all pins to input and low
+  for (uint8_t i; i<NUM_DIGITAL_PINS; i++){
+    Serial.print(".");
+    if (i==TX_PIN || i==RX_PIN);
+    else pinMode(i, INPUT);
+  }
+  Serial.print(".");
+  pinMode(LED_BUILTIN, OUTPUT); // set LED to output bc having it as an input would make little sense
+  while (Serial.available() > 0){
+    Serial.print(".");
+    Serial.read();
+  }
+  Serial.print("s\r\n");
+}
+
+/*
+
+status (output from serial line)
+  <letter of command> command acknowledgement
+  . internal operation or waiting
+  <data>
+  s success
+  e error
+  \n ready
+commands (input to serial line)
+  R pseudo-reset
+    run setup again
+  h show help
+  m set mode
+    usage: followed by two digit pin number and o or i
+    set a pin to input or output mode
+    "pinMode"
+  x toggle mode
+    usage: followed by two digit pin number
+    toggle a pin's mode
+    enables pullup resistor for previously high output pins
+    sets output high for previous input pins with pullup enabled
+  a analog read
+    usage: followed by two digit analog pin number
+    returns state of an analog pin
+    pin number will be converted to digital pin automatically
+  r read
+    usage: followed by pin number
+    returns state of a pin
+    "digitalRead"
+  w write
+    usage: followed by two digit pin number and h or l
+    sets a pin to the desired state
+    sets pullup resistor for input pins
+    "digitalWrite"
+  p write pwm
+    usage: followed by two digit pin number and three digit value between 000 and 255
+    "analogWrite"
+  t toggle pin state
+    usage: followed by two digit pin number
+    toggles state of output pins
+    toggles pullup resistor for input pins
+  q lock
+    lock the Arduino's state by running an infinite loop
+*/
+
+void loop(){
+}