Craig Evans / Mbed 2 deprecated ELEC2645_InterruptIn

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Dependencies:   mbed

Diff: main.cpp

Revision:
2:20e71c579204
Parent:
1:58d6707580cb
Child:
3:6cc7d6600a30
--- a/main.cpp	Tue Jan 05 17:00:56 2016 +0000
+++ b/main.cpp	Tue Jan 05 17:38:13 2016 +0000
@@ -17,7 +17,8 @@
 DigitalOut red_led(LED_RED);
 
 // flag - must be volatile as changes within ISR
-volatile int sw2_flag = 0;
+// g_ prefix makes it easier to distinguish it as global
+volatile int g_sw2_flag = 0;
 
 // function prototypes
 void sw2_isr();
@@ -37,8 +38,8 @@
     while (1) {
 
         // check if flag i.e. interrupt has occured
-        if (sw2_flag) {
-            sw2_flag = 0;  // if it has, clear the flag
+        if (g_sw2_flag) {
+            g_sw2_flag = 0;  // if it has, clear the flag
 
             // DO TASK HERE
         }
@@ -52,5 +53,5 @@
 // SW2 event-triggered interrupt
 void sw2_isr()
 {
-    sw2_flag = 1;   // set flag in ISR
+    g_sw2_flag = 1;   // set flag in ISR
 }