StephanRichter/Nano-485
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Signed-off-by: Stephan Richter <s.richter@srsoftware.de>
This commit is contained in:
Stephan Richter
2023-12-03 12:11:16 +01:00
parent ca66b1c380
commit 0ce4f0cd4d
10 changed files with 152 additions and 285 deletions
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95
BiDi/BiDi.ino
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/* RS 485-Implementierung, die sowohl Schreiben als auch Lesen kann */
/* Basis für andere Projekte */
#define BUTTON 2
#define RECEIVE 3
#define RECEIVE_ENABLE 4
#define SEND 5
#define SEND_ENABLE 6
#define MAX_LEN 128
void setup() {
// Buttons connected to analog input lines
pinMode(A0,INPUT_PULLUP);
pinMode(A1,INPUT_PULLUP);
pinMode(A2,INPUT_PULLUP);
pinMode(A3,INPUT_PULLUP);
pinMode(A4,INPUT_PULLUP);
pinMode(A5,INPUT_PULLUP);
pinMode(A6,INPUT_PULLUP);
pinMode(A7,INPUT_PULLUP);
// Currently, all buttons are also connected via a diode to an interruptable pin, to notify on input changes.
// This interruptable pin should be assgined to BUTTON
pinMode(BUTTON,INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(BUTTON),button,FALLING); // interrupt for button change
// Set up pins for RS485 connection
pinMode(RECEIVE, INPUT);
pinMode(RECEIVE_ENABLE, OUTPUT);
pinMode(SEND, OUTPUT);
pinMode(SEND_ENABLE, OUTPUT);
attachInterrupt(digitalPinToInterrupt(RECEIVE),receive,CHANGE); // interrupt for incoming RS485 traffic
reset485();
buttons = 0x0;
}
void button() {
buttons = 0xFF ^ (digitalRead(A7)<<7 | digitalRead(A6)<<6 | digitalRead(A5)<<5 | digitalRead(A4)<<4 | digitalRead(A3)<<3 | (!digitalRead(A2))<<2 | digitalRead(A1)<<1 | digitalRead(A0));
}
void receive(){
bool received_bit = digitalRead(RECEIVE);
curr = micros();
duration = curr - last;
Serial.print("Input switched to ");
Serial.print(received_bit?"H":"L");
Serial.print(" after ");
Serial.print(duration);
Serial.println(" ticks");
last = curr;
if (duration > MAX_TICKS) reset485();
received_bit = !received_bit; // received_bit is the current value, the duration of the previous value (=inverted) has been measured
duration /= BASE;
while (duration > 0){
byte_idx--;
recv |= received_bit<<byte_idx;
if (byte_idx == 0) {
msg[msg_idx] = recv;
msg_idx++;
byte_idx = 8;
if (recv == 0x00) message_received();
}
duration--;
}
}
void reset485(){
byte_idx = 8;
msg_idx = 0;
recv=0x0;
}
void message_received(){
for (int i=0; i<MAX_LEN; i++) message[i]=msg[i];
reset485();
}
void button_pressed(int i){
Serial.println("not implemented");
}
void loop(){
if (buttons>0){
for (int i=0; i<7; i++){
if (buttons & (1<<i)) button_pressed(i);
}
}
if (message[0] != 0x0){
Serial.print("Received '");
Serial.print(message);
Serial.println("'");
message[0] = 0x0;
}
}

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61
Receiver/Receiver.ino
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// Für Controllino könnte man benutzen: sRx = 20, sTx = 21, enable = 53
int sTx = 2;
int sRx = 3;
long base = 100;
long rst = base*10; // reset
boolean bt = false;
long dif = 0;
long lt = 0;
long now = 0;
char rcv = 0;
int idx = 0;
String message;
void setup(){
pinMode(sRx,INPUT);
pinMode(sTx,OUTPUT);
attachInterrupt(digitalPinToInterrupt(sRx),change485,CHANGE);
Serial.begin(115200);
Serial.println("Receiver ready");
}
void reset485(long dif){
rcv = 0;
idx = -1;
message.reserve(32);
}
void change485(){
bool bt = digitalRead(sRx);
now = micros();
dif = now - lt;
lt = now;
if (dif > rst){
reset485(dif);
} else {
handle485(!bt,dif);
}
}
void handle485(boolean bt, long dif){
long count = dif/base;
for (int i=0; i<count; i++) push485(bt);
}
void push485(boolean bt){
if (idx>=0) rcv |= bt<<idx;
idx++;
if (idx == 8){
if (rcv == 13) {
Serial.println(message);
message = "";
} else {
message+=rcv;
}
idx =0;
rcv =0;
}
}
void loop(){}

129
Sender/Sender.ino
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// Breadboard
//int enable = 2;
//int sTx = 4;
//int sRx = 5;
// RS485-Nano Revision 1.0
int enable = 9;
int sTx = 8;
int sRx = 3;
// Für Controllino könnte man benutzen: sRx = 20, sTx = 21, enable = 53
int in1 = 4; // o
int in2 = 5; // |o
int in3 = 6; // ||o
int in4 = 7; // |||o
// ↓↓↓↓
int irq = 2;// ←++++
long base = 1000;
int id = 0;
int baud = 115200;
char c;
int counter = 0;
bool reg1=false,reg2=false,reg3=false,reg4=false;
void setup(){
Serial.begin(baud);
pinMode(A0,INPUT);
id = analogRead(A0);
pinMode(enable,OUTPUT);
digitalWrite(enable,LOW);
pinMode(sTx,OUTPUT);
digitalWrite(sTx,LOW);
pinMode(in1,INPUT);
pinMode(in2,INPUT);
pinMode(in3,INPUT);
pinMode(in4,INPUT);
pinMode(irq,INPUT);
attachInterrupt(digitalPinToInterrupt(irq),interrupt,RISING);
pinMode(sRx,INPUT);
Serial.print("Baud rate set to ");
Serial.println(baud);
Serial.print("Initialized Arduino #");
Serial.println(id);
}
void interrupt(){
Serial.println("Interrupt");
reg1 = digitalRead(in1);
reg2 = digitalRead(in2);
reg3 = digitalRead(in3);
reg4 = digitalRead(in4);
}
bool sendBit(bool bt){
digitalWrite(sTx,bt);
delayMicroseconds(80);
if (digitalRead(sTx) != bt) return false;
delayMicroseconds(base-80);
return true;
}
bool sendChar(char c){
return sendBit(c & 0x01)
&& sendBit(c & 0x02)
&& sendBit(c & 0x04)
&& sendBit(c & 0x08)
&& sendBit(c & 0x10)
&& sendBit(c & 0x20)
&& sendBit(c & 0x40)
&& sendBit(c & 0x80);
}
bool sendString(String s){
Serial.print("Sending '"+s+"'…");
boolean busy = false;
for (int i = 0; i<11; i++){
if (!digitalRead(sRx)) {
if (!busy){
Serial.print("busy…");
busy = true;
}
i = 0; // wait for free line
}
delayMicroseconds(base);
}
digitalWrite(enable,HIGH);
bool success = sendBit(0); // erste Flanke erzeugen
if (success) {
for (char c : s){
if (!sendChar(c)){
success = false;
break;
}
}
}
success = success && sendChar(13);
success = success && sendBit(1); // letzte Flanke erzeugen
digitalWrite(enable,LOW);
Serial.println(success ? "success" : "failed");
return success;
}
void loop(){
if (reg1){
reg1 = false;
sendString("t:02:01");
}
if (reg2){
reg2 = false;
sendString("t:02:02");
}
if (reg3){
reg3 = false;
sendString("t:02:03");
}
if (reg4){
reg4 = false;
sendString("t:02:04");
}
}

56
Software/LCDReceiver/LCDReceiver.ino Normal file
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/*
* Demonstrates how to use LCDisplay in conjunction with SoftRS485:
*
* The main _loop_ of this program listens on the RS485 bus.
* Whenever a message is received from the bus, it is displayed on the LCD.
*/
// include the library code:
#include <LiquidCrystal.h>
#include <SoftRS485.h>
#define Max485_RO 3 // read-output of Max485
#define Max485_RE 5 // not-read-enable of Max485
#define Max485_DE 9 // data enable of Max485
#define Max485_DI 8 // data input of Max485
#define LCD_RS 4
#define LCD_EN 6
#define LCD_D4 7
#define LCD_D5 11
#define LCD_D6 12
#define LCD_D7 13
// initialize the library by associating any needed LCD interface pin with the arduino pin number it is connected to
LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7);
void setup() {
Serial.begin(115200);
init485(Max485_RO,Max485_RE,Max485_DE,Max485_DI); // library initialization:
invert485polarity(true);
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
Serial.println("LCDReceive 1.2");
lcd.print("LCDReceive 1.2");
}
void loop() {
if (available485()) {
String s = get485message();
Serial.println(s);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print(s);
if (s.length()>16) {
lcd.setCursor(0, 1);
s=s.substring(16);
s.trim();
lcd.print(s);
}
}
}

0
ManualSend/ManualSend.ino → Software/ManualSend/ManualSend.ino
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0
ManualSend/Readme.md → Software/ManualSend/Readme.md
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96
Software/Sender/Sender.ino Normal file
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/*
* Demonstrates how to use LCDisplay in conjunction with SoftRS485:
*
* The main _loop_ of this program listens on the RS485 bus.
* Whenever a message is received from the bus, it is displayed on the LCD.
*/
// include the library code:
#include <SoftRS485.h>
#define PROGRAM "RS485-Nano 2.0.1"
#define BTN_INT 2 // button interrupt pin
#define Max485_RO 3 // read-output of Max485
#define Max485_RE 5 // not-read-enable of Max485
#define Max485_DE 9 // data enable of Max485
#define Max485_DI 8 // data input of Max485
#define TRESHOLD 100000 // 100ms
#define ID 0
// 0=Test
// 1=Arbeitszimmer
// 2=Küche
// 3=Bad
//#define LOG_TO_SERIAL
#define SEND_485
boolean states[8];
unsigned long times[8];
void setup() {
Serial.begin(115200);
init485(Max485_RO,Max485_RE,Max485_DE,Max485_DI); // library initialization:
pinMode(BTN_INT,INPUT_PULLUP);
pinMode(14,INPUT_PULLUP);
pinMode(15,INPUT_PULLUP);
pinMode(16,INPUT_PULLUP);
pinMode(17,INPUT_PULLUP);
pinMode(18,INPUT_PULLUP);
pinMode(19,INPUT_PULLUP);
pinMode(20,INPUT_PULLUP);
pinMode(21,INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(2),isr,CHANGE);
// Print a message to the LCD.
Serial.println(PROGRAM);
#ifdef LOG_TO_SERIAL
Serial.println("14 15 16 17 18 19 20 21");
#endif
}
void isr(){
states[0] = !digitalRead(14);
states[1] = !digitalRead(15);
states[2] = !digitalRead(16);
states[3] = !digitalRead(17);
states[4] = !digitalRead(18);
states[5] = !digitalRead(19);
states[6] = !(analogRead(20)>200);
states[7] = !(analogRead(21)>200);
#ifdef LOG_TO_SERIAL
for (int i=0;i<8;i++){
Serial.print(" "); Serial.print(states[i]); Serial.print(" ");
}
Serial.println();
#endif
}
#ifdef SEND_485
void send(int btn){
String s = "{nano:"+String(ID)+",btn:"+String(btn)+"}";
for (int i = 0; i<10; i++){
if (send485(s.c_str())) break;
Serial.println("collision detected, trying again:");
}
}
#endif
void loop(){
unsigned long now = micros();
for (int i=0;i<8;i++){
if (states[i]){
if (now - times[i] > TRESHOLD){
#ifdef SEND_485
send(i+1);
#endif
times[i] = now;
}
states[i] = 0;
}
}
}