Revision 0:7da792c21683, committed 2017-07-13

Comitter:

noutram

Date:

Thu Jul 13 14:48:19 2017 +0000

Child:

1:2efb658a2ace

Commit message:

updated for mbed-os 5.5

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jul 13 14:48:19 2017 +0000
@@ -0,0 +1,129 @@
+#include "mbed.h"
+
+DigitalOut  red_led(D7);
+DigitalOut  yellow_led(D6);
+DigitalOut  green_led(D5);
+DigitalIn   SW1(D4);
+DigitalIn   SW2(D3);
+
+//This is the solution based on the proposed flowchart.
+
+class SwitchState {
+    private:
+    //Enumerated type (integer)
+    enum STATE { WAITING4PRESS=1, WAITING4BOUNCE_RISING=2, WAITING4RELEASE=4, WAITING4BOUNCE_FALLING=8 };
+    
+    STATE state;        //Current state in the FSM
+    DigitalIn& sw;      //Reference to a GPIO Input
+    DigitalOut& led;    //Reference to a GPIO Output
+    Timer tmr;          //Internal timer used for debounce
+
+    //Toggle the LED state
+    void toggleLed() {
+        led = !led;
+    }
+    
+    //Next state (circular pattern)
+    void gotoNextState() {
+        state = (state  >> 3) | ((state << 1) & 0b1111);    
+    }
+    
+    //Constructor    
+    public:
+    SwitchState(DigitalIn& gpioIn, DigitalOut& gpioOut) : sw(gpioIn), led(gpioOut) {
+        state = WAITING4PRESS;
+        tmr.stop();
+        tmr.reset();
+    }
+    
+    //Update the state using polling
+    void updateState()
+    {
+        switch (state) {
+            
+        //Waiting for switch to be pressed
+        case WAITING4PRESS:
+
+            if (sw == 1) {
+                //Output: start timer
+                tmr.reset();
+                tmr.start();
+                
+                //Next state
+                gotoNextState(); 
+                puts("Entering state: WAITING4BOUNCE_RISING");
+            } 
+            break;
+            
+        //Waiting for 50ms to elapse
+        case WAITING4BOUNCE_RISING:      
+            if (tmr.read_ms() > 50) {
+                //Outputs: Stop timer
+                tmr.stop();
+                //Next state
+                gotoNextState();  
+                puts("Entering state: WAITING4RELEASE");                
+            }    
+            break;
+        
+        //Waiting for switch to be released
+        case WAITING4RELEASE:
+            if (sw == 0) {
+                //Outputs: Toggle the LED and start timer
+                toggleLed();
+                tmr.reset();
+                tmr.start();                
+                //Next state
+                gotoNextState(); 
+                puts("Entering state: WAITING4BOUNCE_FALLING");  
+            } 
+            break;
+            
+        //Waiting 50ms for switch bounce         
+        case WAITING4BOUNCE_FALLING:
+            if (tmr.read_ms() > 50) {
+                //Outputs: Reset timer 1
+                tmr.stop();
+                tmr.reset();
+                
+                //Next state:
+                gotoNextState();
+                puts("Entering state: WAITING4PRESS"); 
+            }
+            break;
+            
+        default:
+            //Something has gone very wrong
+            tmr.stop();
+            tmr.reset();
+            led = 0;
+            state = WAITING4PRESS;
+            puts("ERROR");
+            break;
+        
+        } //end switch        
+        
+    }
+};
+
+
+int main() {
+    
+    //Initial logging message
+    puts("START");
+    
+    //Create two objects using different inputs and outputs
+    SwitchState s1(SW1, red_led);
+    SwitchState s2(SW2, green_led);
+
+    //Main Polling Loop
+    while (true) {
+                
+        s1.updateState();
+        s2.updateState();
+                
+    } //end while
+
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Jul 13 14:48:19 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#8828635da469162cf2854b5287561c663fb96e72