added debug to timer0

[svn42.git] / firmware / tuer.pde

diff --git a/firmware/tuer.pde b/firmware/tuer.pde
index 1808c88..c949297 100644 (file)
--- a/firmware/tuer.pde
+++ b/firmware/tuer.pde
@@ -22,6 +22,13 @@ byte next_led = 0;
 
 #define MANUAL_OPEN_PIN 12  // keys for manual open and close
 #define MANUAL_CLOSE_PIN 13 // 
+#define DEBOUNCE_DELAY 625  // * 16us = 10ms
+#define DEBOUNCE_IDLE 0     // currently no debouncing
+#define DEBOUNCE_OPEN 1     // debouncing open key
+#define DEBOUNCE_CLOSE 2    // debouncing close key
+#define DEBOUNCE_FINISHED 4 // debouncing finished
+byte debounce_state;
+int debounce_cnt = 0;
 
 #define IDLE 0      // close and open may be called
 #define OPENING 1   // opening, only 's' command is allowed
@@ -76,9 +83,12 @@ void init_manual()
 
   pinMode(MANUAL_CLOSE_PIN, INPUT);     // set pin to input
   digitalWrite(MANUAL_CLOSE_PIN, HIGH); // turn on pullup resistors  
+
+  debounce_state = DEBOUNCE_IDLE;
+  debounce_cnt = DEBOUNCE_DELAY;
 }
 
-boolean manual_open()
+boolean manual_open_pressed()
 {
   if(digitalRead(MANUAL_OPEN_PIN))
      return false;
@@ -86,7 +96,7 @@ boolean manual_open()
   return true;
 }
 
-boolean manual_close()
+boolean manual_close_pressed()
 {
   if(digitalRead(MANUAL_CLOSE_PIN))
      return false;
@@ -94,6 +104,97 @@ boolean manual_close()
   return true;
 }
 
+void start_debounce_timer()  // this breaks millis() function, but who cares
+{
+  debounce_cnt = DEBOUNCE_DELAY;
+
+  TCCR0A = 0;         // no prescaler, WGM = 0 (normal)
+  TCCR0B = 1<<CS00;   // 
+  OCR0A = 255;        // 1+255 = 256 -> 16us @ 16 MHz
+  TCNT0 = 0;          // reseting timer
+  TIMSK0 = 1<<OCF0A;  // enable Interrupt
+
+}
+
+void stop_debounce_timer()
+{
+  // timer0
+  TCCR0B = 0; // no clock source
+  TIMSK0 = 0; // disable timer interrupt
+}
+
+ISR(TIMER0_COMPA_vect)
+{
+  if((debounce_state & DEBOUNCE_OPEN && manual_open_pressed()) ||
+     (debounce_state & DEBOUNCE_CLOSE && manual_close_pressed())) {
+    if(debounce_cnt) {
+      debounce_cnt--;
+      return;
+    }
+    debounce_state |= DEBOUNCE_FINISHED;
+
+    if(digitalRead(HEARTBEAT_PIN))
+      digitalWrite(HEARTBEAT_PIN, LOW);
+    else
+      digitalWrite(HEARTBEAT_PIN, HIGH);
+  }
+  debounce_cnt = DEBOUNCE_DELAY;
+}
+
+boolean manual_open()
+{
+  if(manual_open_pressed()) {
+    if(debounce_state & DEBOUNCE_CLOSE) {
+      stop_debounce_timer();
+      debounce_state = DEBOUNCE_IDLE;
+      return false;
+    }
+
+    if(debounce_state == DEBOUNCE_IDLE) {
+      debounce_state = DEBOUNCE_OPEN;
+      start_debounce_timer();
+    }
+    else if(debounce_state & DEBOUNCE_FINISHED) {
+      stop_debounce_timer();
+      debounce_state = DEBOUNCE_IDLE;
+      return true;
+    }
+  }
+  else {
+    stop_debounce_timer();
+    debounce_state = DEBOUNCE_IDLE;
+  }
+
+  return false;
+}
+
+boolean manual_close()
+{
+  if(manual_close_pressed()) {
+    if(debounce_state & DEBOUNCE_OPEN) {
+      stop_debounce_timer();
+      debounce_state = DEBOUNCE_IDLE;
+      return false;
+    }
+
+    if(debounce_state == DEBOUNCE_IDLE) {
+      debounce_state = DEBOUNCE_CLOSE;
+      start_debounce_timer();
+    }
+    else if(debounce_state & DEBOUNCE_FINISHED) {
+      stop_debounce_timer();
+      debounce_state = DEBOUNCE_IDLE;
+      return true;
+    }
+  }
+  else {
+    stop_debounce_timer();
+    debounce_state = DEBOUNCE_IDLE;
+  }
+
+  return false;
+}
+
 //********************************************************************//
 
 void reset_stepper()
@@ -317,11 +418,13 @@ void init_heartbeat()
   pinMode(HEARTBEAT_PIN, OUTPUT);
   reset_heartbeat();
   // timer 2: ~10 ms, timebase for heartbeat signal
+/*
   TCCR2A = 1<<WGM21;                    // prescaler 1:1024, WGM = 2 (CTC)
   TCCR2B = 1<<CS22 | 1<<CS21 | 1<<CS20; // 
   OCR2A = 155;        // (1+155)*1024 = 159744 -> ~10 ms @ 16 MHz
   TCNT2 = 0;          // reseting timer
   TIMSK2 = 1<<OCIE2A; // enable Interrupt
+*/
   heartbeat_on();
 }