Revision 0:2d148f94a249, committed 2015-11-06

Comitter:

rgaribay

Date:

Fri Nov 06 17:22:55 2015 +0000

Commit message:

First example on buttons. Untested.

Changed in this revision

diff -r 000000000000 -r 2d148f94a249 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 06 17:22:55 2015 +0000
@@ -0,0 +1,107 @@
+// Quick example on buttons
+// By Fernando R.
+
+#include "mbed.h"
+#include <iostream>
+
+#define DEBOUNCE_MS 25
+
+DigitalIn button(PTE1);
+DigitalOut ledRed(LED_RED);
+DigitalOut ledGreen(LED_GREEN);
+DigitalOut ledBlue(LED_BLUE);
+
+enum State {
+    VERDE,
+    AMARILLO,
+    ROJO,
+};
+
+
+State nextState(State currentState);
+void executeState(State state);
+
+int main() {
+    State currentState;
+    while (1) {
+        if (button) {
+            currentState = nextState(currentState);
+        }
+        executeState(currentState);
+    }
+}
+
+int main_alternative_for_only_once_on_press() {
+    State currentState;
+    int buttonThisCycle = 0;
+    int buttonPreviousCycle = 0;
+
+    while (1) {
+        buttonThisCycle = button;
+        if (buttonThisCycle && !buttonPreviousCycle) {
+            currentState = nextState(currentState);
+        }
+        executeState(currentState);
+        buttonPreviousCycle = buttonThisCycle;
+    }
+}
+
+int main_alternative_for_only_once_on_press_with_debounce() {
+    State currentState;
+    int buttonThisCycle = 0;
+    int buttonPreviousCycle = 0;
+    Timer t;
+    unsigned int timeLastPress = 0;
+    t.start();
+
+    while (1) {
+        buttonThisCycle = button;
+        if (buttonThisCycle && !buttonPreviousCycle) {
+            int timeSinceLastPress = t.read_ms() - timeLastPress;
+            if (timeSinceLastPress > DEBOUNCE_MS) {
+                timeLastPress = t.read_ms();
+                currentState = nextState(currentState);
+            }
+        }
+        executeState(currentState);
+        buttonPreviousCycle = buttonThisCycle;
+    }
+}
+
+State nextState(State currentState) {
+    switch (currentState) {
+    case VERDE:
+        return AMARILLO;
+        break;
+    case AMARILLO:
+        return ROJO;
+        break;
+    case ROJO:
+        return VERDE;
+        break;
+    default:
+        std::cerr << "Invalid State";
+    }
+}
+
+void executeState(State state) {
+    switch (state) {
+    case VERDE:
+        ledRed = 1;
+        ledGreen = 0;
+        ledBlue = 1;
+        break;
+    case AMARILLO:
+        ledRed = 0;
+        ledGreen = 0;
+        ledBlue = 1;
+        break;
+    case ROJO:
+        ledRed = 0;
+        ledGreen = 1;
+        ledBlue = 1;
+        break;
+    default:
+        std::cerr << "Invalid State";
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 2d148f94a249 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Nov 06 17:22:55 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/9296ab0bfc11
\ No newline at end of file