added basic code

1 files changed, 46 insertions, 0 deletions

diff --git a/arduino/libraries/Bluefruit52Lib/examples/Hardware/digital_interrupt_deferred/digital_interrupt_deferred.ino b/arduino/libraries/Bluefruit52Lib/examples/Hardware/digital_interrupt_deferred/digital_interrupt_deferred.ino
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+++ b/arduino/libraries/Bluefruit52Lib/examples/Hardware/digital_interrupt_deferred/digital_interrupt_deferred.ino
@@ -0,0 +1,46 @@
+/*********************************************************************
+ This is an example for our Feather Bluefruit modules
+
+ Pick one up today in the adafruit shop!
+
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+/*
+ * This sketch demonstrate how to pass ISR_DEFFERED as additional parameter
+ * to defer callback from ISR context with attachInterrupt
+ */
+#include <Arduino.h>
+
+int interruptPin = A0;
+
+void setup()
+{
+  Serial.begin(115200);
+
+  pinMode(interruptPin, INPUT_PULLUP);
+
+  // ISR_DEFERRED flag cause the callback to be deferred from ISR context
+  // and invoked within a callback thread.
+  // It is required to use ISR_DEFERRED if callback function take long time 
+  // to run e.g Serial.print() or using any of Bluefruit API() which will
+  // potentially call rtos API
+  attachInterrupt(interruptPin, digital_callback, ISR_DEFERRED | CHANGE);
+}
+
+void loop()
+{
+  // nothing to do
+}
+
+void digital_callback(void)
+{
+  Serial.print("Pin value: ");
+  Serial.println(digitalRead(interruptPin));
+}