Yifeng Yuan
part3 update
Diff: main.cpp
- Revision:
- 2:75fb721a5b86
- Parent:
- 1:1260dba917b0
--- 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