From d0f3647d26529a5fa7e9e936d7933d6a18e9c6b2 Mon Sep 17 00:00:00 2001
From: Jared <jared@elab.kth.se>
Date: Sat, 4 Feb 2017 19:44:25 +0000
Subject: [PATCH] Almost working version

---
 RPi/i2c_challenge.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/RPi/i2c_challenge.c b/RPi/i2c_challenge.c
index 679cac8..114515d 100644
--- a/RPi/i2c_challenge.c
+++ b/RPi/i2c_challenge.c
@@ -23,7 +23,7 @@
 #include <wiringPiI2C.h>
 
 uint8_t solve_challenge(uint8_t arg) {
-  return (arg >> 3) ^ (arg << 3);
+  return (arg >> 3);
 }
 
 uint8_t parse_int(const char *s) { // Convert string to hex
@@ -67,8 +67,11 @@ int main(int argc, char *argv[]) {
   delay(1);
 
   challenge = wiringPiI2CRead(fd);
+  printf("Received %d\n", challenge);
   response = solve_challenge(challenge);
-  wiringPiI2CWrite(fd, response);
+  printf("Sending %d\n", response);
+  delay(100);
+  wiringPiI2CWrite(fd, (uint8_t)response);
 
   return 0;
 }