4 files changed, 105 insertions, 1 deletions
diff --git a/usb-i2c-sl018/Makefile b/usb-i2c-sl018/Makefile
index 3199ff0..811648f 100644
--- a/usb-i2c-sl018/Makefile
+++ b/usb-i2c-sl018/Makefile
@@ -23,7 +23,7 @@
 
 NAME := tuer-rfid
 BOARD_TYPE := teensy2
-OBJ := $(NAME).o
+OBJ := $(NAME).o heartbeat.o
 LIBS := util led lufa-descriptor-usbserial
 EXTERNAL_LIBS := lufa
 
diff --git a/usb-i2c-sl018/heartbeat.c b/usb-i2c-sl018/heartbeat.c
new file mode 100644
index 0000000..6822320
--- /dev/null
+++ b/usb-i2c-sl018/heartbeat.c
@@ -0,0 +1,68 @@
+/*
+ *  spreadspace avr utils
+ *
+ *
+ *  Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+ *                     Othmar Gsenger <otti@wirdorange.org>
+ *
+ *  This file is part of spreadspace avr utils.
+ *
+ *  spreadspace avr utils is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  spreadspace avr utils is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <avr/sfr_defs.h>
+#include <avr/interrupt.h>
+
+#include "led.h"
+#include "heartbeat.h"
+
+#define HEARTBEAT_DURATION 10 // *10 ms, duration of heartbeat pulse
+#define HEARTBEAT_DELAY 200   // *10 ms, 1/heartbeat-frequency
+uint8_t heartbeat_cnt = 0;                    
+uint8_t heartbeat_flag;
+
+// while running this gets called every ~10ms
+ISR(TIMER0_COMPA_vect)
+{
+  heartbeat_cnt++;
+  if(heartbeat_cnt == HEARTBEAT_DURATION)
+    heartbeat_flag = 0;
+  else if(heartbeat_cnt >= HEARTBEAT_DELAY) {
+    heartbeat_flag = 1;
+    heartbeat_cnt = 0;
+  }
+}
+
+void init_heartbeat(void)
+{
+  led_off();
+  heartbeat_cnt = 0;
+  heartbeat_flag = 1;
+
+  // timer 2: ~10 ms, timebase for heartbeat signal
+  TCCR0A = 1<<WGM01;                    // OC0A and OC0B as normal output, WGM = 2 (CTC)
+  TCCR0B = 1<<CS02 | 1<<CS00;           // Prescaler 1:1024
+  OCR0A = 155;        // (1+155)*1024 = 159744 -> ~10 ms @ 16 MHz
+  //OCR2A = 194;        // (1+194)*1024 = 199680 -> ~10 ms @ 20 MHz
+  TCNT2 = 0;          // reseting timer
+  TIMSK0 = 1<<OCIE0A; // enable Interrupt
+}
+
+void handle_heartbeat(void)
+{
+  if(heartbeat_flag)
+    led_on();
+  else
+    led_off();
+}
diff --git a/usb-i2c-sl018/heartbeat.h b/usb-i2c-sl018/heartbeat.h
new file mode 100644
index 0000000..2ad7166
--- /dev/null
+++ b/usb-i2c-sl018/heartbeat.h
@@ -0,0 +1,30 @@
+/*
+ *  spreadspace avr utils
+ *
+ *
+ *  Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+ *                     Othmar Gsenger <otti@wirdorange.org>
+ *
+ *  This file is part of spreadspace avr utils.
+ *
+ *  spreadspace avr utils is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  spreadspace avr utils is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef R3TUER_heatbeat_h_INCLUDED
+#define R3TUER_heatbeat_h_INCLUDED
+
+void init_heartbeat(void);
+void handle_heartbeat(void);
+
+#endif
diff --git a/usb-i2c-sl018/tuer-rfid.c b/usb-i2c-sl018/tuer-rfid.c
index 91906bf..153371f 100644
--- a/usb-i2c-sl018/tuer-rfid.c
+++ b/usb-i2c-sl018/tuer-rfid.c
@@ -32,6 +32,8 @@
 #include "util.h"
 #include "led.h"
 
+#include "heartbeat.h"
+
 #include "LUFA/Drivers/Peripheral/TWI.h"
 #include "LUFA/Drivers/Peripheral/Serial.h"
 #include "LUFA/Drivers/Misc/RingBuffer.h"
@@ -434,6 +436,8 @@ int main(void)
   sei();
   Serial_Init(115200,false);
   Serial_CreateStream(&serial_stream);
+
+  init_heartbeat();
   
   sl018_reset();
   for(;;) {
@@ -449,5 +453,7 @@ int main(void)
       if(card_status)
         handle_card();
     }
+
+    handle_heartbeat();
   }
 }