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85 lines
2.3 KiB
85 lines
2.3 KiB
/*// 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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