Diff: main.cpp

Revision:

0:f64b05ad6b04

Child:

1:aa56bae2dac7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jan 24 13:44:23 2016 +0000
@@ -0,0 +1,40 @@
+
+#include "mbed.h"
+/** 08_led_switch
+ * Sitch on/off LED1 by a pushbutton tied between D3 and GND
+ * The program implements a very simple inite State Machine (FSM) model
+ *
+ * Hardware requirements:
+ *  - FRDM-KL25Z board
+ *  - A pusbutton between D3 (PTA12) and GND
+ */
+DigitalIn SW1(D3,PullUp);
+DigitalOut LED_1(LED_RED);
+
+typedef enum  {                         //Set of possible states
+    STATE_WAIT_FOR_PRESS,
+    STATE_WAIT_FOR_RELEASE
+} state_t;
+
+
+int main()
+{
+    //Define initial state
+    state_t mystate = STATE_WAIT_FOR_PRESS;
+    LED_1 = 1;                          //LED off at start
+    while (true) {
+        switch(mystate) {
+            case STATE_WAIT_FOR_PRESS:
+                if (SW1==0)  {          //if button pressed
+                    LED_1 = !LED_1;     //toggle LED_1
+                    mystate = STATE_WAIT_FOR_RELEASE;
+                }
+                break;
+            case STATE_WAIT_FOR_RELEASE:
+                if (SW1==1) {       //if button released
+                    mystate = STATE_WAIT_FOR_PRESS;
+                }
+        }
+        wait_ms(20);            //debounce delay
+    }
+}
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