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--- en:c_16x2lcd_interrupt [2015/05/08 18:41]
john1117
+++ en:c_16x2lcd_interrupt [2015/05/08 18:42] (current)
john1117
@@ Line 1: / Line 1: @@
+====== Button Interrupt example ======
+  gcc -o wiring_isr wiring_isr.c -lwiringPi -lpthread
+  ./wiring_isr
+Push your SW1 on 16x2lcd board
+<file c wiring_isr.c>
+#include <stdio.h>
+#include <wiringPi.h>
+int volatile btnCounter;
+void myInterrupt(void)
+{
+        btnCounter++;
+}
+int main(void)
+{
+        if (wiringPiSetup() < 0) {
+                printf("wiringPiSetup error.\n");
+                return 1;
+        }
+        if (wiringPiISR(5, INT_EDGE_FALLING, &myInterrupt) < 0) {
+                printf("wiringPiISR error.\n");
+                return 1;
+        }
+        while(1) {
+                printf("%d\n", btnCounter);
+                delay(1000);
+        }
+        return 0;
+}
+</file>