Diff: main.cpp

Revision:

0:7c6b15d40e00

Child:

1:1260dba917b0

diff -r 000000000000 -r 7c6b15d40e00 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Feb 12 23:52:52 2015 +0000
@@ -0,0 +1,205 @@
+#include "mbed.h"
+#include "string.h"
+// speaker sound effect demo using PWM hardware output
+PwmOut speaker(p21);
+Serial usb(USBTX, USBRX);
+DigitalOut row8(p8);
+DigitalOut row1(p5);
+DigitalOut row2(p6);
+DigitalOut row4(p7);
+InterruptIn col7(p27);
+InterruptIn col6(p28);
+InterruptIn col5(p29);
+InterruptIn col3(p30);
+
+unsigned short global_timer;//global variable
+unsigned short global_key_index;
+
+extern "C" void TIMER0_IRQHandler (void);
+void timer0_init(void);
+void play_tone(int freq, int dur);
+bool check_buffer_format(char *buffer);
+//void scan_all_rows();
+void key_1();
+void key_2();
+void key_3();
+void key_A();
+
+
+
+int main()
+{
+    //printf("Gello world!\n");
+    
+    //en8.rise(&check_row8);
+    //en1.rise(&check_row1);
+    //en2.rise(&check_row2);
+    //en4.rise(&check_row4);
+    global_timer = 0;
+    row8 = 0;
+    row1 = 0;
+    row2 = 0;
+    row4 = 0;
+    
+    while (1) {
+        if (global_timer < 4) {
+            row8 = 1;
+            col3.rise(&key_1);
+            col5.rise(&key_2);
+            col6.rise(&key_3);
+            col7.rise(&key_A);
+        }
+        else if (global_timer < 8){
+            row8 = 0;
+            row1 = 1;
+        }
+        else if (global_timer < 12) {
+            row1 = 0;
+            row2 = 1;
+        }
+        else if (global_timer < 16) {
+            row2 = 0;
+            row4 = 1;
+        }
+        else {
+            row4 = 0;
+            global_timer = 0;
+        }
+    }
+            
+
+    
+    /*
+    while (1) {   
+        speaker = 0.0;
+        int freq = 0; 
+        int dur = 0;
+        int i;
+        const int buffer_length = 7; //this is the actual buffer length, excluding the '\0' in the end
+        bool flag = true;
+        char buffer[128];
+        usb.gets(buffer, buffer_length+1);
+        //usb.puts(buffer);
+        //check if input is valid
+        if (check_buffer_format(buffer) == false){
+            printf("Invalid input format, please re-enter:\n");
+            continue;
+            }
+            
+            
+        
+        //convert input string to two numbers, freq & dur
+        for (i=0; i < buffer_length; i++) {
+            //flag indicades whether the string represents frequency or duration
+            if (buffer[i] == ' ') {
+                flag = false;
+                continue;
+            }
+            if (flag) {
+                freq *= 10;
+                freq += buffer[i] - '0';
+            } else {
+                dur *= 10;
+                dur += buffer[i] - '0';
+            }
+        }
+        //usb.printf("freq: %d; dur: %d\n", freq, dur);
+        play_tone(freq, dur);
+    }
+    */
+}
+
+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
+    }
+}
+
+void timer0_init(void)
+{
+    LPC_SC->PCONP |=1<1;            //timer0 power on
+    LPC_TIM0->MR0 = 23980;          //1 msec(needs to be verified)
+    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");
+}
+
+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
+}
+
+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;
+}
+
+/*
+void scan_all_rows()
+{
+    timer0_init();
+    global_timer = 0;
+    while(1)
+    {
+        en8.fall(&check_row8);
+        if (global_timer > 4) {
+            en1.fall(&check_row1);
+            //scan next row
+            if (global_timer > 8) {
+                en2.fall(&check_row2);
+                //scan next row
+                if (global_timer > 12) {
+                    en4.fall(&check_row4);
+                    if (global_timer > 16) {
+                        break;
+                    }
+                }
+            }
+        }
+    }
+    usb.printf("row %d is pressed!\n",global_row_index);
+    global_timer = 0;
+}
+*/
+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");
+}
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