Bhakti Kulkarni
Plays the happy birthday song music on the speaker.
Dependencies: DebounceInterrupts mbed
Revision 0:33ad8330e62d, committed 2014-06-10
- Comitter:
- bhakti08
- Date:
- Tue Jun 10 21:53:29 2014 +0000
- Commit message:
- Happy Birthday Song using mbed;
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DebounceInterrupts.lib Tue Jun 10 21:53:29 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/bhakti08/code/DebounceInterrupts/#96a51b236ba0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedIn.cpp Tue Jun 10 21:53:29 2014 +0000
@@ -0,0 +1,93 @@
+#include "DebouncedIn.h"
+#include "mbed.h"
+
+/*
+ * Constructor
+ */
+DebouncedIn::DebouncedIn(PinName in)
+ : _in(in) {
+
+ // reset all the flags and counters
+ _samples = 0;
+ _output = 0;
+ _output_last = 0;
+ _rising_flag = 0;
+ _falling_flag = 0;
+ _state_counter = 0;
+
+ // Attach ticker
+ _ticker.attach(this, &DebouncedIn::_sample, 0.005);
+}
+
+void DebouncedIn::_sample() {
+
+ // take a sample
+ _samples = _samples >> 1; // shift left
+
+ if (_in) {
+ _samples |= 0x80;
+ }
+
+ // examine the sample window, look for steady state
+ if (_samples == 0x00) {
+ _output = 0;
+ }
+ else if (_samples == 0xFF) {
+ _output = 1;
+ }
+
+
+ // Rising edge detection
+ if ((_output == 1) && (_output_last == 0)) {
+ _rising_flag++;
+ _state_counter = 0;
+ }
+
+ // Falling edge detection
+ else if ((_output == 0) && (_output_last == 1)) {
+ _falling_flag++;
+ _state_counter = 0;
+ }
+
+ // steady state
+ else {
+ _state_counter++;
+ }
+
+ // update the output
+ _output_last = _output;
+
+}
+
+
+
+// return number of rising edges
+int DebouncedIn::rising(void) {
+ int return_value = _rising_flag;
+ _rising_flag = 0;
+ return(return_value);
+}
+
+// return number of falling edges
+int DebouncedIn::falling(void) {
+ int return_value = _falling_flag;
+ _falling_flag = 0;
+ return(return_value);
+}
+
+// return number of ticsk we've bene steady for
+int DebouncedIn::steady(void) {
+return(_state_counter);
+}
+
+// return the debounced status
+int DebouncedIn::read(void) {
+ return(_output);
+}
+
+// shorthand for read()
+DebouncedIn::operator int() {
+ return read();
+}
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedIn.h Tue Jun 10 21:53:29 2014 +0000
@@ -0,0 +1,31 @@
+#include "mbed.h"
+
+ class DebouncedIn {
+ public:
+ DebouncedIn(PinName in);
+
+ int read (void);
+ operator int();
+
+ int rising(void);
+ int falling(void);
+ int steady(void);
+
+ private :
+ // objects
+ DigitalIn _in;
+ Ticker _ticker;
+
+ // function to take a sample, and update flags
+ void _sample(void);
+
+ // counters and flags
+ int _samples;
+ int _output;
+ int _output_last;
+ int _rising_flag;
+ int _falling_flag;
+ int _state_counter;
+
+ };
+
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Jun 10 21:53:29 2014 +0000
@@ -0,0 +1,47 @@
+/****************************************************************************************/
+/* IO DEVICES ASSIGNMENT 6 */
+/*This program uses the PWM output to generate a "HAPPY BIRTHDAY" Tone on the speaker */
+/****************************************************************************************/
+
+#include "mbed.h"
+
+// ms
+#define A4 440
+#define B4b 446
+#define C4 261
+#define C4_1 130
+#define C5 523
+#define D4 293
+#define D4b 277
+#define E4 329
+#define F4 349
+#define G4 392
+
+PwmOut buzzer(p26);
+
+
+float notes[] = {C4_1,C4,D4,C4,F4,E4,C4_1,C4,D4,C4,G4,F4,C4_1,C4,C5,A4,F4,E4,D4,B4b,B4b,A4,F4,G4,F4};
+
+
+float interval[] = {4, 4, 8, 8, 8, 10, 4, 4, 8, 8, 8, 10, 4, 4, 8, 8, 8, 8, 8, 4, 4, 8, 8, 8, 12};
+
+int main() {
+ while (1) {
+ for (int i=0;i<=24;i++) {
+ buzzer.period((1/notes[i])); // set PWM period
+ buzzer=0.5; // set duty cycle
+ wait(0.8*interval[i]/10); // hold for beat period
+ }
+ buzzer = 0;
+ wait(5);
+ }
+}
+
+
+/****************************************************************************************/
+/* TESTING */
+/****************************************************************************************/
+
+/*1. Power up the mbed, load the program and press the reset button. The tone should play*/
+/* as long as the mbed is powered up. PASS*/
+/*****************************************************************************************/
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Jun 10 21:53:29 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/0b3ab51c8877 \ No newline at end of file