/***************************************************************************
                          test.c  -  description
                             -------------------
    begin                : Sun Sep 3 2000
    copyright            : (C) 2000 by William Rachelson
    email                : gurufool@cc.gatech.edu
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "ezusb.h"

// ---------------------------------------------------------------------------
// Defines.
// ---------------------------------------------------------------------------
#define FALSE 0
#define TRUE  1
#define LOW   0
#define HIGH  1


// ---------------------------------------------------------------------------
// Function prototypes.
// ---------------------------------------------------------------------------
void init_ser( void );
void ser_printString(char *);
void ser_putc(unsigned char);

// ---------------------------------------------------------------------------
// Global variable definitions.
// ---------------------------------------------------------------------------
unsigned char xdata ser_txIndexIn;
unsigned char xdata ser_txIndexOut;

unsigned char xdata ser_txBuffer[0x100];
unsigned char xdata ser_rxBuffer[0x100];

static bit ser_txBusy;




//------------------------------------------------------------------
// Main routine here
//------------------------------------------------------------------
void
main( void )
{   
	init_ser();	// Initialize serial ops.
	ser_printString("HELLO WORLD");
}

// ---------------------------------------------------------------------------
//  Initialize serial operations.
// ---------------------------------------------------------------------------
void
init_ser( void )
{
	//Disable Serial Ints
	ES0 = FALSE;

	//Initialize local vars
	ser_txBusy     = 0;
	ser_txIndexIn  = 0;
	ser_txIndexOut = 0;

	/* Setup baud and port */
	//	PORTBCFG |= 0xC;	//PORTBCFG RxD1 and TxD1 HIGH
	//	SCON1	= 0x50;	// Mode 1

	PORTCCFG |= 3;
	SM0 = 0; SM1 = 1;    // Mode 1
	SM2 = 1;              // RI on valid STOP only
	REN = 1;              // Receive Enabled


	// Timer 2 setup
	TCLK = 1;		// Use the Timer 2 for the Tx clk
	RCLK = 1;		// Use the Timer 2 for the Rx clk
	C_T2 = 0;		// Use it as a timer, not counter
	TH2 = 0xFF;		// Set the counter to reload soon
	TL2 = 0xFF;
	//RCAP2H = 0xFF;		// 19.2kHz
	//RCAP2L = 0xD9;
	RCAP2H = 0xFF; RCAP2L = 0xB2;		// 9.6kHz
	TR2 = 1;		// Start the Timer 2 running
	TI = 0;		// Clear the transmit flag

	//	SMOD1	= 1;	//Double Baud rate
	//	TMOD	= 0x20;	// Timer 1, mode 2, 8-bit reload.
	//	T1M	= 1;		//Use Clock 24/4
	//	TH1 = 0xD9;		// 9600 baud
	//	TR1 = 1;		// Timer 1 run.
	//	PS1 = TRUE;	// High priority.

	ES0 = TRUE;		// Enable serial interrupt.
	//Enable Interrupts
	EA = 1;
}

void
ser_interrupt_handler(void) interrupt 4 using 1        //change me for uart1/0!
{
	ES0 = 0;

	if (TI)
	{
		TI = 0;
		if (ser_txIndexIn == ser_txIndexOut)
		{
			ser_txBusy = 0;
		}
		else
		{
			SBUF0 = ser_txBuffer[ser_txIndexOut++];
		}
	}

	//clear recv ints and ignore them
	if (RI)
	{
		RI = 0;
	}

	ES0 = 1;
}

void
ser_putc(unsigned char c)
{
	ES0 = 0;

	if (ser_txBusy)
	{
		ser_txBuffer[ser_txIndexIn++] = c;
	}
	else
	{
		ser_txBusy = 1;
		SBUF0 = c;
	}

	ES0 = 1;
}

void
ser_printString(char *String)
{
  while (*String)
	{
		ser_putc(*String++);
	}
}