Diff: main.cpp

Revision:

0:2963997f2a2f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Nov 17 18:04:17 2016 +0000
@@ -0,0 +1,75 @@
+#include "mbed.h"
+Serial pc(USBTX, USBRX); // comms to host PC
+BusOut Seg1(p5,p6,p7,p8,p9,p10,p11,p12); // A,B,C,D,E,F,G,DP
+BusOut Seg2(p13,p14,p15,p16,p17,p18,p19,p20); // A,B,C,D,E,F,G,DP
+void SegInit(void); // function prototype
+void HostInit(void); // function prototype
+char GetKeyInput(void); // function prototype
+char SegConvert(char SegValue); // function prototype
+char data1, data2; // variable declarations
+int main()   // main program
+{
+    SegInit(); // call function to initialise the 7-seg displays
+    HostInit(); // call function to initialise the host terminal
+    while (1) { // infinite loop
+        data2 = GetKeyInput(); // call function to get 1st key press
+        Seg2=SegConvert(data2); // call function to convert and output
+        data1 = GetKeyInput(); // call function to get 2nd key press
+        Seg1=SegConvert(data1); // call function to convert and output
+        pc.printf(" "); // display spaces between 2 digit numbers
+    }
+}
+
+void SegInit(void)
+{
+    Seg1=SegConvert(0); // initialise to zero
+    Seg2=SegConvert(0); // initialise to zero
+}
+void HostInit(void)
+{
+    pc.printf("\n\rType two digit numbers to be displayed on the 7-seg display\n\r");
+}
+char GetKeyInput(void)
+{
+    char c = pc.getc(); // get keyboard data (note num. ascii range 0x30-0x39)
+    pc.printf("%c",c); // print ascii value to host PC terminal
+    return (c&0x0F); // return value as non-ascii (bitmask c with value 0x0F)
+}
+
+char SegConvert(char SegValue)   // function 'SegConvert'
+{
+    char SegByte=0x00;
+    switch (SegValue) { //DPGFEDCBA
+        case 0 :
+            SegByte = 0x3F;
+            break; // 00111111 binary
+        case 1 :
+            SegByte = 0x06;
+            break; // 00000110 binary
+        case 2 :
+            SegByte = 0x5B;
+            break; // 01011011 binary
+        case 3 :
+            SegByte = 0x4F;
+            break; // 01001111 binary
+        case 4 :
+            SegByte = 0x66;
+            break; // 01100110 binary
+        case 5 :
+            SegByte = 0x6D;
+            break; // 01101101 binary
+        case 6 :
+            SegByte = 0x7D;
+            break; // 01111101 binary
+        case 7 :
+            SegByte = 0x07;
+            break; // 00000111 binary
+        case 8 :
+            SegByte = 0x7F;
+            break; // 01111111 binary
+        case 9 :
+            SegByte = 0x6F;
+            break; // 01101111 binary
+    }
+    return SegByte;
+}
\ No newline at end of file