Diff: main.cpp

Revision:

0:8ccb53688328

Child:

1:9840610e5ff2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Mar 03 15:10:39 2017 +0000
@@ -0,0 +1,48 @@
+/* ELEC1620 Application Board Example
+
+Example of using getc to receive data from the PC to control
+the application board
+
+(c) Dr Craig A. Evans, University of Leeds, Feb 2017
+
+*/
+
+#include "mbed.h"
+#include "ShiftReg.h"  // include ShiftReg library
+
+ShiftReg shift;  // create ShiftReg object
+Serial pc(USBTX,USBRX);  
+
+int main()
+{
+    // values for 0 - 9 in hex
+    int seven_seg_array [] = {
+        0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67
+    };
+
+    // write 0 to 7-seg to turn it off
+    shift.write(0x00);
+
+    while(1) {
+
+        // readable tells us if a character is waiting to be read
+        if ( pc.readable() ) {
+            // if one is there, then read in using getc
+            char c = pc.getc();    
+            
+            // check if it is a digit that has been received - note ' ' for char
+            if (c >= '0' && c <= '9') {
+                // the received char is in ASCII so convert to int by substracting
+                // the ASCII value of '0'
+                int value = c - '0';
+                
+                // make that value appear on the 7-seg display
+                shift.write(seven_seg_array [value]);
+                
+            }
+            
+        }
+        
+
+    }
+}