ESE519
new
Dependencies: mbed
Diff: main.cpp
- Revision:
- 1:461a4f04db9b
- Parent:
- 0:89cc1300ce7e
- Child:
- 2:94a34bcf8f09
diff -r 89cc1300ce7e -r 461a4f04db9b main.cpp
--- a/main.cpp Tue Feb 17 21:31:58 2015 +0000
+++ b/main.cpp Thu Feb 19 18:33:11 2015 +0000
@@ -5,13 +5,16 @@
//Initialize serial comms
Serial pc(USBTX, USBRX);
-PwmOut PWMh(p26);
-PwmOut PWMl(p21);
+PwmOut PWMh(p22);
+//because both use same ticker make a new manual pmw
+DigitalOut PWMl(p21);
+Ticker PWMcont;
+//PwmOut PWMl(p21);
-DigitalOut row1(p25);
-DigitalOut row2(p22);
-DigitalOut row3(p23);
-DigitalOut row4(p24);
+DigitalOut row1(p26);
+DigitalOut row2(p23);
+DigitalOut row3(p24);
+DigitalOut row4(p25);
DigitalIn col1(p20);
DigitalIn col2(p19);
@@ -23,6 +26,9 @@
map<int, char> keypadMap;
map<int, char *> dtmfMap;
+//global
+int on = 0;
+
//Mores Code -> Character Map
void init(){
keypadMap[0x11]='1';
@@ -60,6 +66,13 @@
dtmfMap[0x88]="1633,941"; //D
}
+void flip() {
+ if(on == 1)
+ PWMl = !PWMl;
+ else
+ PWMl = 0;
+}
+
int main() {
init();
//Initialize rows to 0
@@ -67,66 +80,96 @@
row2 = 0;
row3 = 0;
row4 = 0;
+ PWMl = 0;
t1.start();
int cur_input = 0x00;
int prev_input = 0x00;
+
+ //main loop
while(1) {
- //make all rows 0 to add stability
- row1 = 0;
- row2 = 0;
- row3 = 0;
- row4 = 0;
- //Keep each led lit for 4ms
- switch(t1.read_ms()%4){
- case 0:
- row1 = 1;
- cur_input |= 0x10;
- break;
- case 1:
- row2 = 1;
- cur_input |= 0x20;
- break;
- case 2:
- row3 = 1;
- cur_input |= 0x40;
- break;
- case 3:
- row4 = 1;
- cur_input |= 0x80;
- break;
- }
- if(col1 == 1)
- cur_input |= 0x01;
- else if(col2 == 1)
- cur_input |= 0x02;
- else if(col3 == 1)
- cur_input |= 0x04;
- else if(col4 == 1)
- cur_input |= 0x08;
- else cur_input = 0;
+
+
+ //If there was no previous input than switch rows
+ if(prev_input == 0){
+ //make all rows 0 to add stability
+ row1 = 0;
+ row2 = 0;
+ row3 = 0;
+ row4 = 0;
+ //Keep each pin on for 4ms
+ //"turn on" appropriat bit in map when on.
+ switch(t1.read_ms()%4){
+ case 0:
+ row1 = 1;
+ cur_input |= 0x10;
+ break;
+ case 1:
+ row2 = 1;
+ cur_input |= 0x20;
+ break;
+ case 2:
+ row3 = 1;
+ cur_input |= 0x40;
+ break;
+ case 3:
+ row4 = 1;
+ cur_input |= 0x80;
+ break;
+ }
+ }
+
+
-
- if(cur_input) {
- if(cur_input != prev_input) {
- char c = keypadMap[cur_input]; //assign charcter based on input
- if(c != 0){
- pc.printf("%c\r",c); //print input and char
+
+ //Check each colum to see if it is high
+ //if it is "turn on" that respective bit
+ if(col1 == 1)
+ cur_input |= 0x01;
+ else if(col2 == 1)
+ cur_input |= 0x02;
+ else if(col3 == 1)
+ cur_input |= 0x04;
+ else if(col4 == 1)
+ cur_input |= 0x08;
+ else cur_input = 0; //Detect button release or no input set input to 0
+
+ //If curr input is non zero continue
+ if(cur_input) {
+ if(cur_input != prev_input) {
+ char c = keypadMap[cur_input]; //assign charcter based on input
+ if(c != 0){
+ pc.printf("%c\r",c); //print input and char
+ }
+ float freqh,freql;
+ char *freq = dtmfMap[cur_input];
+ sscanf(freq,"%f,%f",&freqh,&freql);
+ pc.printf("High:%f, Low:%f\r",freqh,freql);
+
+
+
+ //PWMl.period(1/freql); // set PWM period to user specified for low tone
+ //PWMl=0.5; // set duty cycle to 50%
+ on = 1;
+ PWMcont.attach(&flip, (1/freql)); // the address of the function to be attached (flip) and the interval (1/freql)
+
+ PWMh.period(1/freqh); // set PWM period to user specified for high tone
+ PWMh=0.5; // set duty cycle to 50%
+
+ }
+
}
- float freqh,freql;
- char *freq = dtmfMap[cur_input];
- sscanf(freq,"%f,%f",&freqh,&freql);
- pc.printf("High:%f, Low:%f\r",freqh,freql);
- PWMh.period(1/freqh); // set PWM period to user specified
- PWMh=0.5; // set duty cycle to 50%
- PWMl.period(1/freql); // set PWM period to user specified
- PWMl=0.5; // set duty cycle to 50%
- prev_input = cur_input;
- }
-
+ //Turn off pulse width modulation if curr input is 0
+ else {
+ PWMh = 0.0;
+ //PWMl = 0.0;
+ on = 0;
+ }
+
+
+ //Maintain the past input
+ prev_input = cur_input;
+
+
}
- else {
- PWMh = 0.0;
- PWMl = 0.0;
- }
- }
+
}
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