Update README.md

Author: souravbaghz

docs/en/README.md

@@ -38,7 +38,7 @@ Testes with Arduino Nano Only.
 
 ## Usage
 
-Example
+Upload the below sketch to work with CANHacker Windows:
 
 ```
 #include <can.h>
@@ -49,29 +49,80 @@ Example
 #include <lib.h>
 
 #include <SPI.h>
+#include <SoftwareSerial.h>
 
 const int SPI_CS_PIN = 10;
 const int INT_PIN = 2;
 
+const int SS_RX_PIN = 3;
+const int SS_TX_PIN = 4;
+
 CanHackerLineReader *lineReader = NULL;
 CanHacker *canHacker = NULL;
 
+SoftwareSerial softwareSerial(SS_RX_PIN, SS_TX_PIN);
+
 void setup() {
     Serial.begin(115200);
     while (!Serial);
     SPI.begin();
+    softwareSerial.begin(115200);
 
     Stream *interfaceStream = &Serial;
+    Stream *debugStream = &softwareSerial;
+    
     
-    canHacker = new CanHacker(interfaceStream, NULL, SPI_CS_PIN);
+    canHacker = new CanHacker(interfaceStream, debugStream, SPI_CS_PIN);
+    //canHacker->enableLoopback(); // uncomment this for loopback
     lineReader = new CanHackerLineReader(canHacker);
     
     pinMode(INT_PIN, INPUT);
 }
 
 void loop() {
-    canHacker->processInterrupt();
-    lineReader->process();
+    CanHacker::ERROR error;
+  
+    if (digitalRead(INT_PIN) == LOW) {
+        error = canHacker->processInterrupt();
+        handleError(error);
+    }
+
+    error = lineReader->process();
+    handleError(error);
+}
+
+void handleError(const CanHacker::ERROR error) {
+
+    switch (error) {
+        case CanHacker::ERROR_OK:
+        case CanHacker::ERROR_UNKNOWN_COMMAND:
+        case CanHacker::ERROR_NOT_CONNECTED:
+        case CanHacker::ERROR_MCP2515_ERRIF:
+        case CanHacker::ERROR_INVALID_COMMAND:
+            return;
+
+        default:
+            break;
+    }
+  
+    softwareSerial.print("Failure (code ");
+    softwareSerial.print((int)error);
+    softwareSerial.println(")");
+
+    digitalWrite(SPI_CS_PIN, HIGH);
+    pinMode(LED_BUILTIN, OUTPUT);
+  
+    while (1) {
+        int c = (int)error;
+        for (int i=0; i<c; i++) {
+            digitalWrite(LED_BUILTIN, HIGH);
+            delay(500);
+            digitalWrite(LED_BUILTIN, LOW);
+            delay(500);
+        }
+        
+        delay(2000);
+    } ;
 }
 ```