Diff: main.cpp

Revision:

0:ab735a18a219

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 07 20:22:25 2020 +0000
@@ -0,0 +1,330 @@
+/*
+A 7-segment display is actually just 8 LEDs in a single package. We can
+therefore connect each LED pin to an mbed pin to display a chosen number.
+*/
+
+
+#include "mbed.h"
+DigitalOut A(p5);
+DigitalOut B(p6);
+DigitalOut C(p7);
+DigitalOut D(p8);
+DigitalOut E(p9);
+DigitalOut F(p10);
+DigitalOut G(p11);
+DigitalOut DP(p12);
+int main()
+{
+    A=1;
+    B=1;
+    C=1;
+    D=1;
+    E=0;
+    F=0;
+    G=1;
+    DP=0;
+}
+
+
+/*
+*/
+// program code for Exercise 2
+#include "mbed.h"
+BusOut Seg1(p5,p6,p7,p8,p9,p10,p11,p12); // ABCDEFGDP
+int main()
+{
+    while (1) { // infinite loop
+        Seg1=0x3F; // 00111111 binary LEDs to '0'
+        wait(0.2);
+        Seg1=0x06; // 00000110 binary LEDs to '1'
+        wait(0.2);
+        Seg1=0x5B; // 01011011 binary LEDs to '2'
+        wait(0.2);
+        Seg1=0x4F; // 01001111 binary LEDs to '3'
+        wait(0.2);
+        Seg1=0x66; // 01100110 binary LEDs to '4'
+        wait(0.2);
+        Seg1=0x6D; // 01101101 binary LEDs to '5'
+        wait(0.2);
+        Seg1=0x7D; // 01111101 binary LEDs to '6'
+        wait(0.2);
+        Seg1=0x07; // 00000111 binary LEDs to '7'
+        wait(0.2);
+        Seg1=0x7F; // 01111111 binary LEDs to '8'
+        wait(0.2);
+        Seg1=0x6F; // 01101111 binary LEDs to '9'
+        wait(0.2);
+    }
+}
+
+
+
+
+/*
+FUNCTIONS
+Return_type function_name (variable_type_1 variable_name_1, variable_type_2 variable_name_2,…)
+{
+... C code here
+... C code here
+}
+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;
+}
+
+*/
+
+
+#include "mbed.h"
+BusOut Seg1(p5,p6,p7,p8,p9,p10,p11,p12);// A,B,C,D,E,F,G,DP
+char SegConvert(char SegValue); // function
+prototype
+int main()   // main program
+{
+    while (1) { // infinite loop
+        for (char i=0; i<10; i++) {
+            Seg1=SegConvert(i);
+            wait(0.2);
+        }
+    }
+}
+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;
+}
+
+/*
+Reusing functions to reduce programming effort
+*/
+
+// main program code for Exercise 4
+#include "mbed.h"
+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);
+char SegConvert(char SegValue); // function prototype
+int main()   // main program
+{
+    while (1) { // infinite loop
+        for (char j=0; j<10; j++) { // counter loop 1
+            Seg2=SegConvert(j); // tens column
+            for (char i=0; i<10; i++) { // counter loop 2
+                Seg1=SegConvert(i); // units column
+                wait(0.2);
+            }
+        }
+    }
+}
+// SegConvert function here...
+
+
+/*
+Building complex mbed projects withfunctions
+*/
+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
+
+/*
+Create a new project and add the following to your main.cpp file:
+*/
+
+#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
+    }
+}
+// add function code here...
+
+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 numerical 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)
+}
+// copy SegConvert function here too...
+
+/*
+Creating a modular program
+*/
+
+// main.cpp file for Exercise 6
+#include "mbed.h"
+#include "HostIO.h"
+#include "SegDisplay.h"
+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
+    }
+}
+
+// SegDisplay.cpp file for Exercise 6
+#include "SegDisplay.h"
+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)
+{
+    Seg1=SegConvert(0); // initialise to zero
+    Seg2=SegConvert(0); // initialise to zero
+}
+char SegConvert(char SegValue)   // function 'SegConvert'
+{
+    char SegByte=0x00;
+    switch (SegValue) { //DP G F E D C B A
+        case 0 :
+            SegByte = 0x3F;
+            break; // 0 0 1 1 1 1 1 1 binary
+        case 1 :
+            SegByte = 0x06;
+            break; // 0 0 0 0 0 1 1 0 binary
+        case 2 :
+            SegByte = 0x5B;
+            break; // 0 1 0 1 1 0 1 1 binary
+        case 3 :
+            SegByte = 0x4F;
+            break; // 0 1 0 0 1 1 1 1 binary
+        case 4 :
+            SegByte = 0x66;
+            break; // 0 1 1 0 0 1 1 0 binary
+        case 5 :
+            SegByte = 0x6D;
+            break; // 0 1 1 0 1 1 0 1 binary
+        case 6 :
+            SegByte = 0x7D;
+            break; // 0 1 1 1 1 1 0 1 binary
+        case 7 :
+            SegByte = 0x07;
+            break; // 0 0 0 0 0 1 1 1 binary
+        case 8 :
+            SegByte = 0x7F;
+            break; // 0 1 1 1 1 1 1 1 binary
+        case 9 :
+            SegByte = 0x6F;
+            break; // 0 1 1 0 1 1 1 1 binary
+    }
+    return SegByte;
+}
+
+/*
+SegDisplay.h should be as follows:
+*/
+
+// SegDisplay.h file for Exercise 6
+#ifndef SEGDISPLAY_H
+#define SEGDISPLAY_H
+#include "mbed.h"
+extern BusOut Seg1; // allow Seg1 to be manipulated by other files
+extern BusOut Seg2; // allow Seg2 to be manipulated by other files
+void SegInit(void); // function prototype
+char SegConvert(char SegValue); // function prototype
+#endif
+
+/*
+The HostIO.cpp should therefore be as follows:
+*/
+
+#include "HostIO.h"
+#include "SegDisplay.h" // allow access to functions and objects in SegDisplay.cpp
+Serial pc(USBTX, USBRX); // communication to host PC
+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 numerical 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)
+}
+
+/*
+HostIO.h should be as follows:
+*/
+#ifndef HOSTIO_H
+#define HOSTIO_H
+#include "mbed.h"
+extern Serial pc; // allow pc to be manipulated by other files
+void HostInit(void); // function prototype
+char GetKeyInput(void); // function prototype
+#endif
+