Diff: main.cpp

Revision:

1:6c219a7a64a1

Parent:

0:667ac0287afa

--- a/main.cpp	Mon Mar 22 16:57:58 2021 +0000
+++ b/main.cpp	Mon Mar 22 20:38:46 2021 +0000
@@ -1,4 +1,4 @@
-// Lab 9 Task 1
+// Lab 9 Task 2-4
 
 #include "mbed.h"
 #include "C12832_lcd.h"
@@ -23,7 +23,7 @@
 
 Serial pc(USBTX,USBRX);   // Serial comms object
 
-
+int state;  // Store program state - Display temp in 1=Celsius 2=Fahrenheit
 
 char welcome_str[] ="Lab Number 9";   // Welcome string
 
@@ -31,14 +31,23 @@
 // ***** Function prototypes *****
 // Just specify the data types that are used by each function
 //
-void pulse_LCD(DigitalOut);
-
-
+void pulse_LCD(DigitalOut, int);  // Pulse the LED a number of times
 
 
 
 int main() 
 {
+    // local variables
+    float temp_c = 0;  // Initialse variable for current temperature in Celsius
+    float temp_f = 0;  // Current temperature in Fahrenheit
+    
+    int serial_char = 0;  // Character buffer from serial port
+    
+    // Initialise global variables
+    state = 1;   // Display temperature in Celsius
+    
+  
+    
     if (t_sensor.open()) // Initialise temp sensor by calling .open()
     {
         //pc.printf("LM75B Device detected!\n"); // Debug message
@@ -50,31 +59,84 @@
     
     while(1) 
     {
-        pulse_LCD(led_1);  // Pulse LED 1
+        if(pb_centre==1) // Center push button pressed
+        {
+            // pulse_LCD(led_1);  // Pulse LED 1 to help debug
+            
+            if(state==1) // Toggle program state from (1 to 2) or (2 to 1)
+                state=2;  
+            else if(state==2) 
+                state=1;
+            
+            while(pb_centre) // loop while centr push button is held down
+            {}
+        }
+        
+        
+        // Check if data waiting in serial port buffer
+        if(pc.readable())
+        {
+            serial_char = pc.getc();  // Display chararacter on 7 segment
+                
+            if(serial_char=='C' || serial_char=='c')
+            {               
+                pc.printf("Temp = %.2f C \n", temp_c ); 
+            }
+            else if(serial_char=='F' || serial_char=='f')
+            {               
+                pc.printf("Temp = %.2f F \n", temp_f ); 
+            }
+            else if(serial_char>='0' && serial_char<='9')
+            {               
+                int pulse_cnt = serial_char-48; // Convert ASCII char to number
+                
+                pulse_LCD(led_1, pulse_cnt);  // Pulse the LED x times
+            }
+        }
+        
+        
+        
+        
+       
         
         lcd.cls();   // Clear the LCD Display
         
         lcd.locate(35,1);  //  Locate cursor to text row 1 on LCD (col, row)       
-        lcd.printf("%s", welcome_str);  //
+        lcd.printf("Lab Number: 9");  //
         
         lcd.locate(35,10);  //  Locate cursor to test row 2 on LCD (col, row)
              
-        // Read temp from sensor and display temperature in Celsius
-        lcd.printf("Temp = %.2f C", (float)t_sensor.temp() ); 
+        // Read temperature from sensor in Celsius
+        temp_c = t_sensor.temp(); 
+        
+        temp_f = (temp_c * 1.8)+32;  // Calculate Fahrenheit
         
-        wait(0.5);  // Pause
+        if(state==1)
+        {
+            lcd.printf("Temp = %.2f C ", temp_c ); 
+        }
+        else if(state==2)
+        {
+            lcd.printf("Temp = %.2f F ", temp_f ); 
+        }
+        
+        
+        
+        wait(0.1);  // Pause
         
     }
 }
 
 
-// Pulse the specified LED on and off
+// Pulse the specified LED on and off a fixed number of times (count)
 //
-void pulse_LCD(DigitalOut led_pin)
+void pulse_LCD(DigitalOut led_pin, int count)
 {
-    led_pin = 1;
-    wait(0.2);
-    led_pin = 0;
-    wait(0.2);
+    for( int i = 0; i< count; i++)
+    {
+        led_pin = 1;
+        wait(0.2);
+        led_pin = 0;
+        wait(0.2);
+    }
 }
-