Diff: main.cpp

Revision:

6:4c46c5ba3aa3

Parent:

5:0406c84a3d6f

Child:

7:90c8a704c9f0

--- a/main.cpp	Thu Nov 10 19:50:13 2016 +0000
+++ b/main.cpp	Thu Nov 17 19:34:57 2016 +0000
@@ -1,14 +1,52 @@
+void SegInit(void); // function to initialise 7-seg displays
+void HostInit(void); // function to initialise the host terminal
+char GetKeyInput(void); // function to get a keyboard input from the terminal
+char SegConvert(char SegValue); // function to convert a number to a 7-segment byte
 #include "mbed.h"
-InterruptIn button(p18); // Interrupt on digital pushbutton input p18
-DigitalOut led1(p5); // digital out to p5
-Timer debounce; // define debounce timer
-void toggle(void); // function prototype
-int main() {
-debounce.start();
-button.rise(&toggle); // attach the address of the toggle
-} // function to the rising edge
-void toggle() {
-if (debounce.read_ms()>200) // only allow toggle if debounce timer
-led1=!led1; // has passed 200 ms
-debounce.reset(); // restart timer when the toggle is performed
+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