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