Diff: main.cpp
- Revision:
- 1:e004fff01d0d
- Parent:
- 0:cfa060762ad7
--- a/main.cpp Tue Feb 17 20:35:43 2015 +0000
+++ b/main.cpp Tue Feb 24 19:02:54 2015 +0000
@@ -1,72 +1,246 @@
#include "mbed.h"
-PwmOut buzzer(p21);
-PwmOut speaker(p26);
+//Defining the keypad rows as outputs and columns as inputs
+Serial pc(USBTX, USBRX);
+DigitalOut row2(p17);
+DigitalOut row3(p12);
+DigitalOut row4(p15);
+DigitalOut row1(p18);
+
+DigitalIn column1(p16);
+DigitalIn column2(p14);
+DigitalIn column3(p13);
+DigitalIn column4(p12);
-Serial pc(USBTX, USBRX);
-DigitalOut cols[4]= {p20,p19,p18,p17};
-InterruptIn rows[4]={p25,p22,p23,p24};
+DigitalOut buzzer(p22);
+
+//defining tickers
+Ticker rowsTick;
+Ticker tick;
+
+//function to flip the buzzer value for generating sounds
+int i = 0;
+
+//function to flip the buzzer value
+void outFreq(){
+ buzzer =! buzzer;
+ }
-double HZc[] = { 1209.0, 1336.0, 1477.0, 1633.0}; // Colum
-double HZr[] = {697.0, 770.0, 852.0, 941.0}; //Row
-char Keytable[] = { '1', '2', '3', 'A',
- '4', '5', '6', 'B',
- '7', '8', '9', 'C',
- '*', '0', '#', 'D'
- };
-
-void start(int row){
- double high = 0, low = 0;
- if(rows[row].read() == 0) return;
- for(int i = 0; i < 4; ++i){
- cols[i].write(0);
- if(rows[row].read() == 0){
- high = HZc[i];
- low = HZr[row];
- pc.printf("input row %d col %d %c \n", row, i, Keytable[row * 4 + i]);
- break;
+//defining class for sound
+class Speaker
+{
+public:
+ Speaker(PinName pin) : inpPin(pin) {
+ }
+//function to play the sound for according to the key pressed
+ void Output(float frequency, float sound) {
+ inpPin.period(1.0/frequency);
+ inpPin = sound;
+ }
+ //defining the inpPin as PwmOut so that microcontroller recoginses it
+ PwmOut inpPin;
+};
+
+//iterating over the rows in a cycle
+void row_press()
+ {
+ if(i < 4)
+ {
+ i++;
}
- }
- buzzer.period(low);
- speaker.period(high);
- buzzer = 0.5;
- speaker = 0.5;
-}
-
-void stop(){
- buzzer.period(0);
- speaker.period(0);
- buzzer = 0;
- speaker = 0;
- for(int i = 0; i < 4; ++i) cols[i] = 1;
+ else
+ {
+ i = 1;
+ }
}
-
+int main(){
-void row0Rise(){
- start(0);
-}
-void row1Rise(){
- start(1);
-}
-void row2Rise(){
- start(2);
-}
-void row3Rise(){
- start(3);
-}
+//initializing all rows to zero
+ Speaker speaker1(p21);
+ row1 = 0;
+ row2 = 0;
+ row3 = 0;
+ row4 = 0;
+
+//calling a ticker once every 4ms
+
+ rowsTick.attach_us(&row_press, 4000);
-void rowFall(){
- stop();
-}
-
-int main() {
- rows[0].rise(&row0Rise);
- rows[1].rise(&row1Rise);
- rows[2].rise(&row2Rise);
- rows[3].rise(&row3Rise);
- for(int i = 0; i < 4; ++i) rows[i].fall(&rowFall);
- while(1) {
- ;
+ while(1){
+ //checking each row and creating the sound accordingly
+ // Check for Row 1
+ if(i == 1){
+ row1 = 1;
+ if(column1 == 1){
+
+ speaker1.Output(1209, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/697.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ pc.printf("1");
+ tick.detach();
+ }
+ else if(column2 == 1){
+ speaker1.Output(1336, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/697.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ pc.printf("2");
+ }
+ else if(column3 == 1){
+ speaker1.Output(1477, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/697.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ pc.printf("3");
+ }
+ else if(column4 == 1){
+ pc.printf("A");
+ speaker1.Output(1633, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/697.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ row1 = 0;
+ }
+ // Check for Row 2
+ if(i == 2){
+
+ row2 = 1;
+
+ if(column1 == 1){
+ pc.printf("4");
+ speaker1.Output(1209, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/770.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column2 == 1){
+ pc.printf("5");
+ speaker1.Output(1336, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/770.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column3 == 1){
+ pc.printf("6");
+ speaker1.Output(1477, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/770.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column4 == 1){
+ pc.printf("B");
+ speaker1.Output(1633, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/770.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ row2 = 0;
+ }
+ // Check for Row 3
+ if(i == 3){
+
+ row3 = 1;
+
+ if(column1 == 1){
+ pc.printf("7");
+ speaker1.Output(1209, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/852.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column2 == 1){
+ pc.printf("8");
+ speaker1.Output(1336, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/852.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column3 == 1){
+ pc.printf("9");
+ speaker1.Output(1477, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/852.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column4 == 1){
+ pc.printf("C");
+ speaker1.Output(1633, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/852.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ row3 = 0;
+ }
+
+ // Check for Row 4
+ if(i == 4){
+
+ row4 = 1;
+
+ if(column1 == 1){
+ pc.printf("*");
+ speaker1.Output(1209, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/941.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column2 == 1){
+ pc.printf("0");
+ speaker1.Output(1336, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/941.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column3 == 1){
+ pc.printf("#");
+ speaker1.Output(1477, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/941.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ else if(column4 == 1){
+ pc.printf("D");
+ speaker1.Output(1633, 0.5);
+ buzzer = 0;
+ tick.attach(&outFreq, 0.5/941.0);
+ wait_ms(16);
+ speaker1.Output(0, 0.0);
+ tick.detach();
+ }
+ row4 = 0;
+ }
}
-}
+
+}
\ No newline at end of file
Wenrui Meng
