From 0e60b9ba972b37dff95a67bcf6710dbe176aec21 Mon Sep 17 00:00:00 2001
From: Andrea Manni <andrea@piffa.net>
Date: Fri, 3 Feb 2017 20:03:09 +0100
Subject: [PATCH] interrupts
---
.../base/base.ino} | 8 +++-
.../interrupts/debounce/debounce.ino | 44 ++++++++++++++++++
.../interrupts/doppia_ISR/doppia_ISR.ino | 38 ++++++++++++++++
.../interrupt_base_volatile.ino | 45 +++++++++++++++++++
.../input_interrupt_0/input_interrupt_0.ino | 31 -------------
.../input_interrupt_1_debounce.ino | 41 -----------------
6 files changed, 134 insertions(+), 73 deletions(-)
rename advanced_projects/{interrupt_base/interrupt_base.ino => interrupts/base/base.ino} (81%)
create mode 100644 advanced_projects/interrupts/debounce/debounce.ino
create mode 100644 advanced_projects/interrupts/doppia_ISR/doppia_ISR.ino
create mode 100644 advanced_projects/interrupts/interrupt_base_volatile/interrupt_base_volatile.ino
delete mode 100644 interrupts/input_interrupt_0/input_interrupt_0.ino
delete mode 100644 interrupts/input_interrupt_1_debounce/input_interrupt_1_debounce.ino
diff --git a/advanced_projects/interrupt_base/interrupt_base.ino b/advanced_projects/interrupts/base/base.ino
similarity index 81%
rename from advanced_projects/interrupt_base/interrupt_base.ino
rename to advanced_projects/interrupts/base/base.ino
index 6118c0b..9b23dc6 100644
--- a/advanced_projects/interrupt_base/interrupt_base.ino
+++ b/advanced_projects/interrupts/base/base.ino
@@ -1,4 +1,10 @@
-// sketch 03_01_interrupts
+/*
+ * Interrupt base
+ *
+ * Utilizzo di un interrupt ala Arduino per intercettare
+ * la pressione di un bottone.
+ *
+ */
int ledPin = 13;
diff --git a/advanced_projects/interrupts/debounce/debounce.ino b/advanced_projects/interrupts/debounce/debounce.ino
new file mode 100644
index 0000000..0857296
--- /dev/null
+++ b/advanced_projects/interrupts/debounce/debounce.ino
@@ -0,0 +1,44 @@
+/*
+ Interrupts : input deboounce
+
+ Utilizzare un interrupt per intercettare
+ l'input di un interruttore momentaneo.
+
+ Debounce software nella funzione richiamata.
+ Per debounce hardware: http://www.all-electric.com/schematic/debounce.htm
+
+ */
+
+int ledPin = 13;
+volatile int state = LOW;
+
+void setup()
+{
+ pinMode(ledPin, OUTPUT);
+ pinMode(2, INPUT_PULLUP);
+ attachInterrupt(0, blink, FALLING);
+}
+
+void loop()
+{
+ //digitalWrite(ledPin, state);
+ delay(10000); // Mette in pausa Arduino per 10sec
+}
+
+// Funzioni
+void blink()
+// Modifica dello stato del LED
+{
+ static unsigned long last_interrupt_time = 0;
+ // This is not supposed to be global
+ // as it's olny accesed inside this ISR
+
+ // If interrupts come faster than 20ms, assume it's a bounce and ignore
+ if (millis() - last_interrupt_time > 20)
+ { // Azione da intraprendere
+ state = !state;
+ digitalWrite(ledPin, state);
+ last_interrupt_time = millis();
+ }
+}
+
diff --git a/advanced_projects/interrupts/doppia_ISR/doppia_ISR.ino b/advanced_projects/interrupts/doppia_ISR/doppia_ISR.ino
new file mode 100644
index 0000000..8577def
--- /dev/null
+++ b/advanced_projects/interrupts/doppia_ISR/doppia_ISR.ino
@@ -0,0 +1,38 @@
+/*
+ * Interrupt doppia ISR
+ *
+ * Utilizzo di un interrupt ala Arduino per intercettare
+ * la pressione di un bottone.
+ *
+ * Doppia ISR: la prima ISR intercetta FALLING
+ * e riconfigura l'interrupt con RISING a una seconda
+ * ISR che a sua volta ripristina il comportamento
+ * precedente.
+ */
+
+int ledPin = 13;
+
+void setup()
+{
+ pinMode(ledPin, OUTPUT);
+ pinMode(2, INPUT_PULLUP);
+ attachInterrupt(0, eventoFall, FALLING);
+ // Partiamo intercettanto un interrupt FALLING
+}
+
+void loop()
+{
+// Tutto avviene nelle ISRs
+}
+
+void eventoFall() // Sempre VOID
+{
+ digitalWrite(ledPin, HIGH);
+ attachInterrupt(0, eventoRise, RISING);
+}
+
+void eventoRise() // Sempre VOID
+{
+ digitalWrite(ledPin, LOW);
+ attachInterrupt(0, eventoFall, FALLING);
+}
diff --git a/advanced_projects/interrupts/interrupt_base_volatile/interrupt_base_volatile.ino b/advanced_projects/interrupts/interrupt_base_volatile/interrupt_base_volatile.ino
new file mode 100644
index 0000000..6dff6fe
--- /dev/null
+++ b/advanced_projects/interrupts/interrupt_base_volatile/interrupt_base_volatile.ino
@@ -0,0 +1,45 @@
+/*
+ * Interrupt doppia ISR
+ *
+ * Utilizzo di un interrupt ala Arduino per intercettare
+ * la pressione di un bottone.
+ *
+ * Doppia ISR: la prima ISR intercetta FALLING
+ * e riconfigura l'interrupt con RISING a una seconda
+ * ISR che a sua volta ripristina il comportamento
+ * precedente.
+ */
+
+const byte ledPin = 13;
+const byte interruptPin = 2; // Arduino 328 / 168
+volatile boolean state = 0 ; // volatile evita che la variabile possa
+// avere valori diversi in SRAM e in un registro,
+// evita che il compilatore in fase di ottimizzazioe la consideri
+// come const nel loop()
+
+void setup()
+{
+ pinMode(ledPin, OUTPUT);
+ pinMode(interruptPin, INPUT_PULLUP); // Vedi: digitalPinToInterrupt()
+ attachInterrupt(0, eventoFall, FALLING);
+ // Partiamo intercettanto un interrupt FALLING
+}
+
+void loop()
+{
+ digitalWrite(ledPin, state);
+ // La variabile state viene richiamata fuori dalla ISR
+ // quindi deve essere dichiarata volatile
+}
+
+void eventoFall() // Sempre VOID
+{
+state = HIGH ;
+ attachInterrupt(0, eventoRise, RISING);
+}
+
+void eventoRise() // Sempre VOID
+{
+state = LOW ;
+ attachInterrupt(0, eventoFall, FALLING);
+}
diff --git a/interrupts/input_interrupt_0/input_interrupt_0.ino b/interrupts/input_interrupt_0/input_interrupt_0.ino
deleted file mode 100644
index 80d1d17..0000000
--- a/interrupts/input_interrupt_0/input_interrupt_0.ino
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- Interrupts : input
-
- Utilizzare un interrupt per intercettare
- l'input di un interruttore momentaneo
-
- */
-
-int ledPin = 13;
-volatile int state = LOW;
-
-void setup()
-{
- pinMode(ledPin, OUTPUT);
- pinMode(2, INPUT_PULLUP);
- attachInterrupt(0, blink, FALLING);
-}
-
-void loop()
-{
- //digitalWrite(ledPin, state);
- delay(10000); // Mette in pausa Arduino per 10sec
-}
-
-// Funzioni
-void blink()
-// Modifica dello stato del LED
-{
- state = !state;
- digitalWrite(ledPin, state);
-}
diff --git a/interrupts/input_interrupt_1_debounce/input_interrupt_1_debounce.ino b/interrupts/input_interrupt_1_debounce/input_interrupt_1_debounce.ino
deleted file mode 100644
index 9361345..0000000
--- a/interrupts/input_interrupt_1_debounce/input_interrupt_1_debounce.ino
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- Interrupts : input deboounce
-
- Utilizzare un interrupt per intercettare
- l'input di un interruttore momentaneo.
-
- Debounce software nella funzione richiamata.
- Per debounce hardware: http://www.all-electric.com/schematic/debounce.htm
-
- */
-
-int ledPin = 13;
-volatile int state = LOW;
-
-void setup()
-{
- pinMode(ledPin, OUTPUT);
- pinMode(2, INPUT_PULLUP);
- attachInterrupt(0, blink, FALLING);
-}
-
-void loop()
-{
- //digitalWrite(ledPin, state);
- delay(10000); // Mette in pausa Arduino per 10sec
-}
-
-// Funzioni
-void blink()
-// Modifica dello stato del LED
-{
- static unsigned long last_interrupt_time = 0;
- // If interrupts come faster than 200ms, assume it's a bounce and ignore
- if (millis() - last_interrupt_time > 200)
- { // Azione da intraprendere
- state = !state;
- digitalWrite(ledPin, state);
- }
- last_interrupt_time = millis();
-}
-
--
2.39.2