Diff: main.cpp

Revision:

0:fa9255e09139

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Feb 10 11:17:24 2021 +0000
@@ -0,0 +1,133 @@
+#include "mbed.h"
+
+Serial pc(USBTX, USBRX);    //create serail comms object
+ 
+BusOut LED_Disp(p7,p11,p9,p8,p5,p6,p10,p12);
+
+//digital inputs
+DigitalIn slide_button(p17);    // set p17 high if buttons controls 7 seg
+DigitalIn slide_putty(p18); 
+ 
+// interrupts in
+InterruptIn button_up(p14);             //assign interrupt to 14 and 15
+InterruptIn button_down(p15);
+ 
+ // digital outputs
+ DigitalOut test_blink(LED1);
+ 
+ // general global variable
+int counter1;                 //global counter value
+ 
+void Increment_up(void);        //ISR to be assigned to button_up interrupt
+void Increment_down(void);      
+void DisplayNumber(int);        //function to display number on seven segment
+ 
+int main()
+{
+    int putty_char;       // charqacter read from putty as integer (ASCII)
+    
+    button_up.rise(&Increment_up);     //attach adress of ISR to interrupt
+    button_down.rise(&Increment_down);
+    
+    counter1 = 0;                    // Initialise global counter variable
+    putty_char = '0';                //initialize local putty character variable
+    DisplayNumber(0);                // on start up the display is 0 
+    
+    while(1)
+    {
+        if(slide_putty == 1)
+        {
+            if(pc.readable()==1)      // check for character on serial port
+            {
+                putty_char = pc.getc();   // read character from putty
+                
+                pc.putc(putty_char);      // echo character back to putty
+                
+                // check if within number range
+                if (putty_char >= '0' && putty_char <= '9')
+                {
+                    test_blink = 1;      // test sequence
+                    wait(0.2);
+                    test_blink = 0;
+                    
+                    DisplayNumber (putty_char-48);    // convert ASKII character to number
+                }
+            }
+        }
+    }
+}
+            
+ 
+// Interrupt function to increment counter
+void Increment_up(void)
+{
+    if(slide_putty)       // Return to main if slide switch is in putty position
+        return;
+    
+    counter1++;    //increment counter
+    
+    if(counter1 <0)   // check for min value
+        counter1 = 0;
+        
+    if(counter1 >9)    //check for max value
+        counter1 = 9;
+        
+    DisplayNumber(counter1);        //display counter1 number on seven segment
+    wait(0.3);                         //debounce timer
+    
+}
+ 
+void Increment_down(void)
+{
+    if(slide_putty)
+        return;
+    
+    counter1--;
+    
+    if(counter1 <0)   
+        counter1 = 0;
+        
+    if(counter1 >9)    
+        counter1 = 9;
+        
+    DisplayNumber(counter1);        
+    wait(0.3); 
+}
+ 
+//funtion to display counter1 on seven segment
+void DisplayNumber(int num)
+{
+    switch(num)
+    {
+        case 0:
+            LED_Disp = ~0x3F;
+            break;
+        case 1:
+            LED_Disp = ~0x06;
+            break;
+        case 2:
+            LED_Disp = ~0x5B;
+            break;
+        case 3:
+            LED_Disp = ~0x4F;
+            break;
+        case 4:
+            LED_Disp = ~0x66;
+            break;
+        case 5:
+            LED_Disp = ~0x6D;
+            break;
+        case 6:
+            LED_Disp = ~0x7D;
+            break; 
+        case 7:
+            LED_Disp = ~0x07;
+            break;
+        case 8:
+            LED_Disp = ~0x7F;
+            break;
+        case 9:
+            LED_Disp = ~0x67;
+            break; 
+    }
+}
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