Reception in software UART

// timerTest.c - simple test program for the  Microchip PICDEM mechatronics board
//
// interrupts 0.1mSec blinks a LED

// connect terminal emulator program to COMM port at 57600 baud

#include <htc.h>
#include "uart.h"


// Setup configuration bits
__CONFIG (EC & WDTDIS & PWRTDIS  & UNPROTECT &  MCLREN & BORDIS & FCMEN & IESOEN);

volatile int tenthMillSecCounter=0;               // incremented every 10mSec

// Timer 0 is programmed to interrupt every 0.1mSeconds
//  T0 clock is FOSC/4 = 200000
//  with 1:2 prescaler decrements 2000000/2 times / second
//  to get an interrupt every  0.1 mSec the calculation for TMR0 overflow from 0xFF to 0 is
//    count = 255 - 1000000/10000 = 255 - 100
//    i.e. for 0.1mSec counter is
#define tenthMillSec 155
static void interrupt isr(void)
{
    if (T0IF)                           // A TMR0 interupt occurred
    {
        TMR0=tenthMillSec;                // increment counters every .1 mSec
        tenthMillSecCounter++;
    }
    T0IF=0;                             // clear TMR0 interrupt flag
}

// delay for count tenths of a second
void tenthMilliSecondDelay(int count)
{
    tenthMillSecCounter=0;                         // zero counter
    while( tenthMillSecCounter  < count) ;    // wait
}
        
        
// initalise clock, set port A for digital input, set up timer 0, etc
void systemInitialise(void)
{
        OSCCON=0x70;             // Fosc use oscillator 8MHz
        ANSEL=0;                 // set digital inputs
        OPTION=0x80;             // TMR0 RATE 1:2
        TMR0=tenthMillSec;       // initialise timer 0 counter
        T0IE = 1;                // enable interrupt on TMR0 overflow from 0xFF to 0
        GIE = 1;                 // Global interrupt enable
 }



//extern int tenMillSecCounter, second, tenthsSecond;
// test program 
void main(void)
{
        int i=0, t, adc;
        char ch='0';
        systemInitialise();
        UARTInitialise();       // initalise UART for rS232 serial output
        TRISA1=1;               // RA1 is switch input
        TRISD6=0;               // RD6 is LED output
        TRISD5=0;               // RD5 is LED output
        RD6=1;                  // set LED
        putString("\n\rTest program for Microchp PICDEM mechatronics board\n\r\n\r");
        putString("\n\r");
        while(1)
        {                                        
             putchar(ch);
             if(ch++ == '9') ch='0';
             RD6=!RD6;                                     // invert LED to blink it
             tenthMilliSecondDelay(10000);
       }
}