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86 lines
2.3 KiB
86 lines
2.3 KiB
12 months ago
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/*// This sketch allows manual setting of the RS485-connected pins via serial terminal commands
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Commands are:
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r+ – enable read mode (^RE ← LOW)
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r- – disable read mode (^RE ← HIGH)
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w+ – enable write mode (DE ← HIGH)
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w- – disable write mode (DE ← LOW)
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h – send HIGH level on DI
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l – send LOW level on DI
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//*/
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#if defined(ARDUINO_AVR_UNO)
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#define RS485_RO 5
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#define RS485_RE 4
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#define RS485_DE 3
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#define RS485_DI 2
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#define BOARD "Arduino Uno"
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#endif
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#if defined(ARDUINO_AVR_NANO)
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#define RS485_RO 3
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#define RS485_RE 2
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#define RS485_DE 4
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#define RS485_DI 5
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#define BOARD "Arduino Nano"
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#endif
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String command = "";
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bool doPrint = false;
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// the setup function runs once when you press reset or power the board
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void setup() {
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// initialize digital pin LED_BUILTIN as an output.
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pinMode(RS485_RO, INPUT);
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pinMode(RS485_RE, OUTPUT);
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pinMode(RS485_DE, OUTPUT);
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pinMode(RS485_DI, OUTPUT);
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digitalWrite(RS485_RE,LOW);
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digitalWrite(RS485_DE,LOW);
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digitalWrite(RS485_DI,LOW);
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Serial.begin(115200);
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Serial.println(F("this is Projekte/Arduino/MAX485/ManualSend"));
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Serial.println(F("send any of the followning commands:"));
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Serial.println(F("- r+ (enable read)\n- r- (disable read)\n- w+ (enable write)\n- w- (disable write)\n- h (for high)\n- l (for low)"));
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}
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// the loop function runs over and over again forever
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void loop() {
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while (Serial.available()){
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char inChar = (char)Serial.read();
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if (inChar == '\n') {
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process(command);
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command = "";
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doPrint = true;
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} else {
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command += inChar;
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}
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}
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if (doPrint){
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printState();
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delay(1000);
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}
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}
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void printState(){
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Serial.print("RE = ");
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Serial.print(1-digitalRead(RS485_RE));
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Serial.print(", DE = ");
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Serial.print(digitalRead(RS485_DE));
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Serial.print(", DI = ");
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Serial.print(digitalRead(RS485_DI));
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Serial.print(", RO = ");
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Serial.println(digitalRead(RS485_RO));
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}
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void process(String command){
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Serial.print(F("received:"));
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Serial.println(command);
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if (command == "r+") digitalWrite(RS485_RE,LOW);
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if (command == "r-") digitalWrite(RS485_RE,HIGH);
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if (command == "w+") digitalWrite(RS485_DE,HIGH);
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if (command == "w-") digitalWrite(RS485_DE,LOW);
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if (command == "h") digitalWrite(RS485_DI,HIGH);
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if (command == "l") digitalWrite(RS485_DI,LOW);
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printState();
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}
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