/*
    XW511.c: Demo program for XW511i

    Compiler: BC++ 3.1
              Turbo C++ 1.01 (3.01)
          
    Compile mode: large

    Project: XW511.c
             ..\..\lib\upac5000.lib
     
    Hardware: uPAC-5000 + XW511i

    [Sep 11, 2017]
*/

#include <stdlib.h>
#include <mem.h>
#include "..\..\lib\uPAC5000.h"

void main(void)
{
    char buf[128];
    unsigned long mytimeticks;
    int i, iOption, iQuit=0;
    char getChar;
    
    InitLib();
    
    // install the driver for the COM port for COM3 to COM6 in the interrupt vector, 
    // which means that all COM ports use the interrupt mechanism to read and write data
    InstallCom(3, 115200l, 8, 0, 1);
    InstallCom(4, 115200l, 8, 0, 1);
    InstallCom(5, 115200l, 8, 0, 1);
    InstallCom(6, 115200l, 8, 0, 1);
    
    Puts("\n");
    Puts("*******************************************\n");
    Puts("|   Demo program for uPAC-5000 + XW511i   |\n");
    Puts("|                                         |\n");
    Puts("|              [Sep 11, 2017]             |\n");
    Puts("*******************************************\n");
    
    while(!iQuit) {
        Puts("\n");
        Puts("1) COM3 <-> COM4\n");
        Puts("2) COM5 <-> COM6\n");
        Puts("\n");
        Puts("0) Quit demo program\n\n");
        Puts("Choose an option and press [Enter]: ");
        Scanf("%d", &iOption);
        Puts("\n");
        
        switch(iOption) {
            case 1:
                ClearCom(4); // clear all data in input buffer of COM4
                ToComBufn(3, "hello world", 11); // send n bytes of data via COM3
                
                memset(buf, 0, sizeof(buf));
                
                mytimeticks = GetTimeTicks();
                for(i=0; i < 11; ) {
                    if(IsCom(4)) { // check whether there is any data in the input buffer of COM4
                        buf[i++] = ReadCom(4); // read one byte of data from the input buffer of COM4
                    }
                    
                    if(GetTimeTicks() - mytimeticks > 20) {
                        i=0;
                        break;
                    }
                }
                
                if(i==0) {
                    Print("timeout\n");
                }
                else {
                    buf[i] = '\0'; // add a null character at the end of a string
                    Print("Received \"%s\" via COM4\n", buf);
                }
                
                break;
                
            case 2:
                ClearCom(6); // clear all data in input buffer of COM6
                ToComStr(5, "hello world\r"); // send a string (ending with '\0') via COM5
                
                memset(buf, 0, sizeof(buf));
                
                i=0;
                getChar='\0';
                mytimeticks = GetTimeTicks();
                do {
                    if(IsCom(6)) {
                        getChar = ReadCom(6);
                        buf[i++] = getChar;
                    }
                    
                    if(GetTimeTicks() - mytimeticks > 20) {
                        i=0;
                        break;
                    }
                } while(getChar != '\r');
                
                if(i==0) {
                    Print("timeout\n");
                }
                else {
                    buf[i - 1] = '\0'; // replace the character '\r' with '\0'
                    Print("Received \"%s\" via COM6\n", buf);
                }
                break;
                
            case 0:
                iQuit=1;
                
                // If the program calls InstallCom, 
                // the RestoreCom must be called to restore the COM Port setting before exiting the program
                RestoreCom(3);
                RestoreCom(4);
                RestoreCom(5);
                RestoreCom(6);
                break;
                
            default:
                break;
        }
        
        if(!iQuit) {
            Puts("\r\nPress any key to continue...\n");
            Getch();
        }
    }
}