Page 196 - ARM Based Microcontroller Projects Using MBED

182 8. INTERMEDIATE LEVEL PROJECTS

/******************************************************************

EVENT COUNTER
=============
In this program teh user button is used to simulate the occurence
of external events. Every time the button is pressed a count is
incremented by one. The total count is displayed on the PC screen.
Author: Dogan Ibrahim
Date : August 2018
File : SerialEvents
********************************************************************/
#include "mbed.h"
Serial MyPC(USBTX, USBRX);
DigitalIn button(BUTTON1);

//
// Clear the screen
//
void clrscr()
{
char clrscr[] = {0x1B, '[', '2' , 'J',0};
MyPC.printf(clrscr);
}
//
// Home the cursor
//
void homescr()
{
char homescr[] = {0x1B, '[' , 'H' , 0};
MyPC.printf(homescr);
}
//
// Goto specified line and column
//
void gotoscr(int line, int column)
{
char scr[] = {0x1B, '[', 0x00, ';' ,0x00, 'H', 0};
scr[2] = line;
scr[4] = column;
MyPC.printf(scr);
}

int main()
{
int Count = 0; // Initialzie Count

clrscr(); // Clear the screen
homescr(); // Home the cursor
MyPC.printf("\n\rEvent Counter"); // Display heading
MyPC.printf("\n\r==============\n\r");
FIG. 8.44 Program listing.
(Continued)