test232.c

Serial port funtions to allow non-blocking read and write (hardware UART). Useful for debugging without changing all the timing, and for general use of serial port. (by Jonathan Bisson).

/********************************************************************
    Filename:   test232.c
    Created:    Sunday, October 12, 2003
    Author(s):  Jonathan Bisson
    History:
    
    Purpose:    Test file for serialCom.c
                Empty RX buffer on timer0 interrupt and echo
                the caracters received

    Copyrights(c) 2003
*********************************************************************/

#include <system.h>
#include "test232.h"
#include "serialCom.h"

#pragma CLOCK_FREQ 20000000

asm {
list p=16F877
__config H'3F72' ;UNPROTECT&HS&WDTDIS&PWRTEN&BORDIS&LVPDIS&DUNPROT&WRTEN&DEBUGDIS
}

short   i16_Timer0Counter;
char    i8_Tasks[TASKS_LIMIT];
char    i8_TasksCounter;

void on_init( void )
{
    i8_TasksCounter = 0;

    //All used pins as ouput
    porta = 0x00;
    trisa = 0x00;
    portb = 0xFF;
    trisb = 0x00;
    portc = 0x00;
    trisc = 0x80;
    portd = 0x00;
    trisd = 0x00;
    porte = 0x00;
    trise = 0x00;

    //Timer0
    option_reg = 0xD7;      //Internal, prescalar = 1:256
    tmr0 = 0;
    set_bit( intcon, T0IE );

    //SerialPort init
    serialInit();

    enable_interrupt( PEIE );
    enable_interrupt( GIE );
}


void on_timer0( void )
{
    if (getRxByteCount() > 0)
    {
        sendHex(getRxByteCount());
        sendString(" byte(s): ");
        while(getRxByteCount() > 0)
        {
            putChar(getChar());
        }
        sendString("\r\n");
    }

}
void on_idle( void )
{

}

void interrupt( void )
{
    if ( intcon&0x20 && intcon&0x04 )
    {
        tmr0 = 0;
        clear_bit( intcon, T0IF );
        if ( ++i16_Timer0Counter >= 77 )
        {
            i16_Timer0Counter = 0;
            if ( i8_TasksCounter < TASKS_LIMIT )
                i8_Tasks[i8_TasksCounter++] = TASK_TIMER0;
        }
    }

    //serialPort interrupt functions
    interruptTx();
    interruptRx();

}

main()
{
    char tmr01;
    char tmr02;
    on_init();

    tmr01 = tmr0;
    sendHex(0xff);
    tmr02 = tmr0;
    sendString("\n\r");
    sendHex(tmr02-tmr01);
    sendString("\n\r");

    sendString("\n\rInit done\n\r");
    while (getTxByteCount() != 0);      //Wait to be sure that the String is send without
                                        //buffer overwrite (blocking)

    sendString("This string is to long so many caracters will be overwrite in the circular buffer\n\r");

    for (;;)
    {
        while ( i8_TasksCounter )
        {
            switch( i8_Tasks[--i8_TasksCounter] )
            {
            case TASK_TIMER0:
                on_timer0();
                break;
            }
        }
        on_idle();
    }
}
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