Revision 2:75fb721a5b86, committed 2015-02-17

Comitter:

yifeng021

Date:

Tue Feb 17 18:48:53 2015 +0000

Parent:

1:1260dba917b0

Commit message:

part3 ticker 2-17-2015 1:50pm uploaded by Yifeng

Changed in this revision

--- a/main.cpp	Fri Feb 13 19:53:09 2015 +0000
+++ b/main.cpp	Tue Feb 17 18:48:53 2015 +0000
@@ -1,7 +1,13 @@
+// This version does not work.
+// The issue is: if I only scan first row, it works. However, when I essentially copy
+// the first case to the rest of the cases(or rows), program does not recognize any
+// input anymore.
+
 #include "mbed.h"
 #include "string.h"
 // speaker sound effect demo using PWM hardware output
-PwmOut speaker(p21);//pwm output
+PwmOut keytone_row(p21);//pwm output for key tone table row freq
+PwmOut keytone_col(p22);//pwm output for key tone table column freq
 Serial usb(USBTX, USBRX);//serial comm
 DigitalOut row8(p8);//pin8 on keypad board->row1(top)
 DigitalOut row1(p5);//pin1 ...->row2
@@ -11,14 +17,12 @@
 InterruptIn col6(p28);//pin6->column 2
 InterruptIn col5(p29);//pin5->column 3
 InterruptIn col3(p30);//pin3->column 4
-
-unsigned short global_timer;//global variable
-unsigned short global_key_index;//global variable, value range:0 - 15, represents for 16 keys
+Ticker t;
 
-extern "C" void TIMER0_IRQHandler (void);
-void timer0_init(void);//initialize timer0
-void play_tone(int freq, int dur);//takes in frequency & duration and plays the tone accodingly
-bool check_buffer_format(char *buffer);//check input string format
+int global_key_index;//global variable, value range:0 - 15, represents for 16 keys
+unsigned short global_flag_row;
+int global_count;
+
 // The following functions determine which key is pressed by changing global variable 'global_key_index'
 void key_1();
 void key_2();
@@ -37,192 +41,187 @@
 void key_pd();
 void key_D();
 
+void scan_row();
+void print_key();
+void key_release();
+
 int main()
 {
-    timer0_init();
-    global_timer = 0;
-    row8 = 0;
-    row1 = 0;
-    row2 = 0;
-    row4 = 0;
+    //usb.printf("hello world!");
+    float dur_row = 4000.0; //time to scan each row in us
+    global_count = 0;
+    global_flag_row = 0;
+    global_key_index = 16;
+    
+    row8 = 1;
+    row1 = 1;
+    row2 = 1;
+    row4 = 1;
+    
+    t.attach_us(&scan_row, dur_row);
     
     while (1) {
-        if (global_timer < 4) {
-            //set row1 to high for 4ms
-            row8 = 1;
-            //scan 4 columns
-            col3.fall(&key_1);
-            col5.fall(&key_2);
-            col6.fall(&key_3);
-            col7.fall(&key_A);    
-        }
-        if (global_timer >= 4 && global_timer < 8){
-            //set row2 to high for 4ms
-            row8 = 0;
-            row2 = 0;
-            row4 = 0;
-            row1 = 1;
-            //scan 4 columns
-            col3.fall(&key_4);
-            col5.fall(&key_5);
-            col6.fall(&key_6);
-            col7.fall(&key_B); 
-        }
-        if (global_timer >= 8 && global_timer < 12) {
-            //set row3 high for 4ms
-            row8 = 0;
-            row1 = 0;
-            row4 = 0;
-            row2 = 1;
-            //scan 4 columns
-            col3.fall(&key_7);
-            col5.fall(&key_8);
-            col6.fall(&key_9);
-            col7.fall(&key_C); 
-        }
-        if (global_timer >= 12 && global_timer < 16) {
-            //set row4 high for 4ms
-            row8 = 0;
-            row1 = 0;
-            row2 = 0;
-            row4 = 1;
-            //scan 4 columns
-            col3.fall(&key_str);
-            col5.fall(&key_0);
-            col6.fall(&key_pd);
-            col7.fall(&key_D); 
-        }
-        if (global_timer >= 16) {
-            row8 = 0;
-            row1 = 0;
-            row2 = 0;
-            row4 = 0;
-            global_timer = 0;
-        }
+        usb.printf("%d",global_key_index);
+        //print_key();
+        //wait(0.2);
     }
 }
 
-//source: https://developer.mbed.org/users/microguy/notebook/timer0-example-code/
-extern "C" void TIMER0_IRQHandler (void)
-{
-if((LPC_TIM0->IR & 0x01) == 0x01)   // if MR0 interrupt, proceed
-    {
-    LPC_TIM0->IR |= 1 << 0;         // Clear MR0 interrupt flag
-    global_timer++;                  //increment timer_count
-    }
-}
-
-//source: https://developer.mbed.org/users/microguy/notebook/timer0-example-code/
-// This function initializes timer0
-void timer0_init(void)
-{
-    LPC_SC->PCONP |=1<1;            //timer0 power on
-    LPC_TIM0->MR0 = 23980;          //1 msec(verified with oscilloscope)
-    LPC_TIM0->MCR = 3;              //interrupt and reset control
-                                    //3 = Interrupt & reset timer0 on match
-                                    //1 = Interrupt only, no reset of timer0
-    NVIC_EnableIRQ(TIMER0_IRQn);    //enable timer0 interrupt
-    LPC_TIM0->TCR = 1;              //enable Timer0
-    printf("Done timer_init\n\r");
-}
-
-// This function plays a tone for a certain duration
-void play_tone(int freq, int dur)
-{
-    speaker.period(1.0/freq); // 500hz period
-    speaker = 0.2; //50% duty cycle - max volume
-    wait(dur/1000.0);
-    speaker=0.0; // turn off audio
-}
-
-// This function checks the user input format of frequency & duration
-bool check_buffer_format(char *buffer)
-{
-    bool flag = true;//true - valid input; false - invalid input
-    int buffer_length = strlen(buffer);
-    int i = 0;
-    for (i=0; i<buffer_length; i++) {
-        //check if buffer[0:2] & buffer[4:6] are #s
-        if (i==0 || i==1 || i==2 || i==4 || i==5 || i==6){
-            if (buffer[i] < '0' || buffer[i] > '9'){
-                flag = false;
-                }
-            }
-        //check if buffer[3] is a 'space'
-        else if (i==3){
-            if (buffer[i] != ' '){
-            flag = false;
-            }
-        }
-    }
-    return flag;
-}
-
 // The following functions determine which key is pressed by changing global variable 'global_key_index'
 //indice:
 //key-[index]
 //1-[0],2-[1],3-[2],A-[3],4-[4],5-[5],6-[6],B-[7],7-[8],8-[9],9-[10],C-[11],*-[12],0-[13],#-[14],D-[15] 
-void key_1(){
-    global_key_index = 0;
-    printf("1 is pressed!\n");
-}
-void key_2(){
-    global_key_index = 1;
-    printf("2 is pressed!\n");
-}
-void key_3(){
-    global_key_index = 2;
-    printf("3 is pressed!\n");
-}
-void key_A(){
-    global_key_index = 3;
-    printf("A is pressed!\n");
-}
-void key_4(){
-    global_key_index = 4;
-    printf("4 is pressed!\n");
-}
-void key_5(){
-    global_key_index = 5;
-    printf("5 is pressed!\n");
-}
-void key_6(){
-    global_key_index = 6;
-    printf("6 is pressed!\n");
-}
-void key_B(){
-    global_key_index = 7;
-    printf("B is pressed!\n");
+void key_1(){global_key_index = 0;}
+void key_2(){global_key_index = 1;}
+void key_3(){global_key_index = 2;}
+void key_A(){global_key_index = 3;}
+void key_4(){global_key_index = 4;}
+void key_5(){global_key_index = 5;}
+void key_6(){global_key_index = 6;}
+void key_B(){global_key_index = 7;}
+void key_7(){global_key_index = 8;}
+void key_8(){global_key_index = 9;}
+void key_9(){global_key_index = 10;}
+void key_C(){global_key_index = 11;}
+void key_str(){global_key_index = 12;}
+void key_0(){global_key_index = 13;}
+void key_pd(){global_key_index = 14;}
+void key_D(){global_key_index = 15;}
+
+void scan_row()
+{
+    global_flag_row = global_count % 4;
+    switch(global_flag_row) {
+        case 0:
+            //printf("case0");
+            row8 = 0;
+            row1 = 1;
+            row2 = 1;
+            row4 = 1;
+            col3.rise(&key_1);
+            col5.rise(&key_2);
+            col6.rise(&key_3);
+            col7.rise(&key_A);
+            col3.fall(&key_release);
+            col5.fall(&key_release);
+            col6.fall(&key_release);
+            col7.fall(&key_release);
+            break;
+        
+        case 1:
+            //printf("case1");
+            row8 = 1;
+            row1 = 0;
+            row2 = 1;
+            row4 = 1;
+            /*
+            col3.rise(&key_4);
+            col5.rise(&key_5);
+            col6.rise(&key_6);
+            col7.rise(&key_B);
+            col3.fall(&key_release);
+            col5.fall(&key_release);
+            col6.fall(&key_release);
+            col7.fall(&key_release);
+            */
+            break;
+        case 2:
+            //printf("case2");
+            row8 = 1;
+            row1 = 1;
+            row2 = 0;
+            row4 = 1;
+            /*
+            col3.rise(&key_7);
+            col5.rise(&key_8);
+            col6.rise(&key_9);
+            col7.rise(&key_C);
+            col3.fall(&key_release);
+            col5.fall(&key_release);
+            col6.fall(&key_release);
+            col7.fall(&key_release);
+            */
+            break;
+        case 3:
+            //printf("case3");
+            row8 = 1;
+            row1 = 1;
+            row2 = 1;
+            row4 = 0;
+            /*
+            col3.rise(&key_str);
+            col5.rise(&key_0);
+            col6.rise(&key_pd);
+            col7.rise(&key_D);
+            col3.fall(&key_release);
+            col5.fall(&key_release);
+            col6.fall(&key_release);
+            col7.fall(&key_release);
+            */
+            break;
+            
+    }
+    global_count += 1;
 }
-void key_7(){
-    global_key_index = 8;
-    printf("7 is pressed!\n");
-}
-void key_8(){
-    global_key_index = 9;
-    printf("8 is pressed!\n");
-}
-void key_9(){
-    global_key_index = 10;
-    printf("9 is pressed!\n");
-}
-void key_C(){
-    global_key_index = 11;
-    printf("C is pressed!\n");
+
+void print_key()
+{
+    switch(global_key_index) {
+        case 0:
+            usb.printf("1");
+            break;
+        case 1:
+            usb.printf("2");
+            break;
+        case 2:
+            usb.printf("3");
+            break;
+        case 3:
+            usb.printf("A");
+            break;
+        case 4:
+            usb.printf("4");
+            break;
+        case 5:
+            usb.printf("5");
+            break;
+        case 6:
+            usb.printf("6");
+            break;
+        case 7:
+            usb.printf("B");
+            break;
+        case 8:
+            usb.printf("7");
+            break;
+        case 9:
+            usb.printf("8");
+            break;
+        case 10:
+            usb.printf("9");
+            break;
+        case 11:
+            usb.printf("C");
+            break;
+        case 12:
+            usb.printf("*");
+            break;
+        case 13:
+            usb.printf("0");
+            break;
+        case 14:
+            usb.printf("#");
+            break;
+        case 15:
+            usb.printf("D");
+            break;
+        case 16:
+            //usb.printf("default!");
+            break;
+    }
 }
-void key_str(){
-    global_key_index = 12;
-    printf("* is pressed!\n");
-}
-void key_0(){
-    global_key_index = 13;
-    printf("0 is pressed!\n");
+
+void key_release()
+{
+    global_key_index = 16;
 }
-void key_pd(){
-    global_key_index = 14;
-    printf("# is pressed!\n");
-}
-void key_D(){
-    global_key_index = 15;
-    printf("D is pressed!\n");
-}
\ No newline at end of file