From 5afa7988fcaae365795bcc612107ceb6846bb674 Mon Sep 17 00:00:00 2001
From: Wilhelm Westermark <willd@kth.se>
Date: Mon, 14 Nov 2016 00:36:59 +0100
Subject: [PATCH] Updated version with proper challenge/response code

---
 RPi/i2c_challenge.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/RPi/i2c_challenge.c b/RPi/i2c_challenge.c
index ea5d48d..cd4a114 100644
--- a/RPi/i2c_challenge.c
+++ b/RPi/i2c_challenge.c
@@ -1,4 +1,4 @@
-O/*
+/*
 *i2ctest.c
 *	Raspberry Pi I2C test using wiringPi library.
 *
@@ -35,28 +35,24 @@ int main (int argc, char *argv[])
         }
         else
         {
-		while(data != 6) {
-			wiringPiI2CWrite(fd, send);
+		delay(1);
+		while(1) {
+		wiringPiI2CWrite(fd, send);
                         data=wiringPiI2CRead(fd);
+                        printf(" Received data=%d\n", data);
                         if(data==-1)
                         {
                                 printf("No data\n");
                                 //return -1;
                         }
-			else if(data == send*3) {
-				printf("Sending challenge");
-				wiringPiI2CWrite(fd, 4);
-			}
-			else if(data == 6) {
-				printf("Read proper response \n");
+			else if(data == 17) {
+				printf("Exit code received \n");
 				break;
 			}
-                        else
-                        {
-                                //print data
-				printf("Waiting to send challenge");
-                        }
-                        printf(" data=%d\n", data);				
+                        else if(data != 0) {
+				printf("Sending response %d\n", data+3 );
+				wiringPiI2CWrite(fd, data+3);
+                        } 
 			
                 }
         }