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// Sample communication Code for RS 485 Shield with Arduino Mega 2560
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#define RS485_OE_1 22 //RS485 CH#1 Output Enable => pin 22 for CH#1
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#define Snd_485 HIGH
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#define Rcv_485 LOW
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void RS485_setup(){
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Serial1.setTimeout(300);
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Serial1.begin(9600);
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pinMode(RS485_OE_1, OUTPUT);
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delay(10);
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digitalWrite(RS485_OE_1, Rcv_485);
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}
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void send_485(){
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if(!Wait_485){
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String message = read_buff(Buff_485_Wr);
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if(message != ""){
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//save sent message info. for received data processing
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latest_sent_msg = message;
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message += CRLF;
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digitalWrite(RS485_OE_1, Snd_485); delay(5);
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Serial1.print(message);
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returnTime = millis();
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Serial1.flush();
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digitalWrite(RS485_OE_1, Rcv_485); delay(5);
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Wait_485 = true;
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Wait_485_cnt = 0;
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}
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else{
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//Serial.println("Free");
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}
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}
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}
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int recieve_485(){
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// Timeout code
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if(Wait_485){
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Wait_485_cnt++;
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if(Wait_485_cnt > 25){ // Timeout = periodic(20ms) x 25 = 500 msec
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Serial.println("485 not responced... (Timeout)");
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if((latest_sent_msg == MC9_10_PV) ||(latest_sent_msg == MC9_10_SV)){
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timeoutMC9();
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}
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latest_sent_msg = "";
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Wait_485 = false;
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Wait_485_cnt = 0;
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numOf485--;
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return 0;
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}
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}
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// Receive pv data
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while(Wait_485 && (Serial1.available() > 0)) {
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char c = Serial1.read();
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write_buff_c(Buff_485_Rd, c);
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}
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String message = read_buff(Buff_485_Rd);
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if(message != ""){
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numOf485--;
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if((latest_sent_msg == MC9_10_PV) ||(latest_sent_msg == MC9_10_SV)){
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saveMC9(message);
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}
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else{
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Serial.print("485 rcv : ");
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Serial.println(message);
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}
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Wait_485 = false;
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Wait_485_cnt = 0;
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}
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return 1;
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}
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/* For Test from PC */
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void recieve_485_0(){
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// Receive pv data
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while(Serial.available() > 0) {
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char c = Serial.read();
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IdeSerial += c;
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}
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if(IdeSerial.endsWith("\n")){
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IdeSerial.replace(CRLF,"");
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IdeSerial += sumMC9(IdeSerial);
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IdeSerial = "" + IdeSerial + CRLF;
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write_buff_first(Buff_485_Wr, IdeSerial);
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IdeSerial = "";
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}
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}
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