// File Name : main.c
// Programmed by Hyun Jee
// Program Date : Tue., Jan. 11, 2005
//
#include <GC80C520_PL44I.H>
#include "timer.h"

//----------- ADC header file ------------//


/* LCD Commands*/
#define DISPLAY_ON1		0x0C	/* display on, cursor off, blink off */
#define DISPLAY_ON2		0x0D	/* display on, cursor off, blink on */
#define DISPLAY_ON3		0x0E	/* display on, cursor on, blink off */
#define DISPLAY_ON4		0x0F	/* display on, cursor on, blink on */
#define DISPLAY_OFF		0x08	/* display off, cursor off, blink off */
#define CLEAR_DISPLAY	0x01
#define CLEAR_DISPLAY2	0x00
#define RETURN_HOME 	0x02	/* to first position on display */
#define ENTRY_MODE1 	0X06	/* entry mode: incrmnt +1, not shift */
#define ENTRY_MODE2 	0X07	/* entry mode: incrmnt +1, shift */
#define ROTATE_RIGHT	0X14	/* Cursor rotate right */
#define ROTATE_LEFT		0X10	/* Cursor rotate left */
#define FUNCTION_SET1 	0X30	/* 8 bit interface, 5x7 dots, 1 lines */
#define FUNCTION_SET2 	0X38	/* 8 bit interface, 5x7 dots, 2 lines */
#define DDRAM_ADDR_EVEN	0x80	/* DDRAM Initialize */
#define DDRAM_ADDR_ODD 	0xC0	/* DDRAM Initialize */


// Declaration of the Variables
xdata unsigned char *pcode;				  // for External Memory
data unsigned char  temp1;				  // for Temporary Data
data unsigned char  temp;				  
data unsigned char  i;					  // for Loop Parameters
data unsigned char  p;					  // for Loop Parameters
data unsigned char	port_change;		  // for PORT Display Delection
data unsigned char	port_value_change;	  // for PORT Value Update Change
data unsigned char	port_display_change;  // for PORT Display Selection

unsigned int	loop_cnt;			// for Loop Parameter    @ timer0
unsigned char	display_count;		// for Display Parameter @timer0
unsigned char	received_data;		// for received data from UART RX pin (RX : Receive Side)


// Prototype Functions
// 1. System Initialization
void initialize(void);

// 2. Led Output
//void output_led(void);

// Sub Function : 8.  void msec(int) {
/* delay function for m seconds */
void msec(int Delay)
{
	int i, j;
	for(j=0; j<Delay; j++)
		for (i=0; i<100; i++);
}

// Sub Function : 9.  void delay_lcd(unsigned int) {
void delay_lcd(unsigned int t) {

//	unsigned int i;
	for(i=0; i<t; i++);
}

// 3. delay fuction
//void delay (int);
// Sub Function - 2. void initialize_lcd(void)
void initialize_lcd(void) {
	// pcode = 0xFFXX : PORTA (and Character LCD Display Databus)
	// pcode = 0xF9XX : LCD_CON[0] (LCD_RW)
	// pcode = 0xF8XX : LCD_CON[1] (LCD_EN)
	// pcode = 0xF7XX : LCD_CON[2] (LCD_RS)

	pcode =(unsigned char xdata *)0xF200;
	*(pcode) = 0x00;		// LCD_RW = 0;
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x00;		// LCD_EN = 0;
	pcode = (unsigned char xdata *)0xF000;
	*(pcode) = 0x00;		// LCD_RS = 0;

	msec(50);


	pcode = (unsigned char xdata *)0xF300;
	*(pcode) = FUNCTION_SET2;
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x01;		// LCD_EN = 1;
	*(pcode) = 0x00;		// LCD_EN = 0;


	delay_lcd(45);
	delay_lcd(45);


	pcode = (unsigned char xdata *)0xF300;
	*(pcode) = DISPLAY_ON1;
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x01;		// LCD_EN = 1;
	*(pcode) = 0x00;		// LCD_EN = 0;

	
	delay_lcd(255);
	delay_lcd(225);


	pcode = (unsigned char xdata *)0xF300;
	*(pcode) = CLEAR_DISPLAY;
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x01;		// LCD_EN = 1;
	*(pcode) = 0x00;		// LCD_EN = 0;

	
	delay_lcd(255);
	delay_lcd(225);


	pcode = (unsigned char xdata *)0xF300;
	*(pcode) = ENTRY_MODE1;
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x01;		// LCD_EN = 1;
	*(pcode) = 0x00;		// LCD_EN = 0;


	delay_lcd(255);
	delay_lcd(225);
	


	pcode = (unsigned char xdata *)0xF000;
	*(pcode) = 0x01;		// LCD_RS = 1;
	
	msec(50);

} // End: void initialize_lcd(void)


// Sub Function - 3. void clearscreen_lcd(void)
void clearscreen_lcd(void) {
	// pcode = 0xFFXX : PORTA (and Character LCD Display Databus)
	// pcode = 0xF9XX : LCD_CON[0] (LCD_RW)
	// pcode = 0xF8XX : LCD_CON[1] (LCD_EN)
	// pcode = 0xF7XX : LCD_CON[2] (LCD_RS)

	pcode =(unsigned char xdata *)0xF000;
	*(pcode) = 0x00;		// LCD_RS = 0;

	pcode = (unsigned char xdata *)0xF300;
	*(pcode) = CLEAR_DISPLAY;
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x01;		// LCD_EN = 1;
	*(pcode) = 0x00;		// LCD_EN = 0;

	pcode = (unsigned char xdata *)0xF000;
	*(pcode) = 0x01;		// LCD_RS = 1;

	
	delay_lcd(255);

	
} // End: void clearscreen_lcd(void)

// Sub Function : 6.  void PutChar(unsigned char) {
void PutChar(unsigned char c) {
	pcode = (unsigned char xdata *)0xF000;
	*(pcode) = 0x01;		// LCD_RS = 1;

	pcode = (unsigned char xdata *)0xF300;
	*(pcode) = c;
	
	pcode = (unsigned char xdata *)0xF100;
	*(pcode) = 0x01;		// LCD_EN = 1;
	*(pcode) = 0x00;		// LCD_EN = 0;
	pcode = (unsigned char xdata *)0xF000;
	*(pcode) = 0x00;		// LCD_RS = 0;
	delay_lcd(45);
	delay_lcd(45);
	delay_lcd(45);
	delay_lcd(45);
}



// Main Function
//
void main(void) {

	initialize();
	
	initialize_lcd();

	clearscreen_lcd();

	
	loop_cnt = 0;

	TR1 = 1;	// Timer1 Start (Enable)
	TR0 = 1;	// Timer0 Start (Enable)

	
	while(1){
		temp = 0;
	}

	
} // End: void Main(void)



// Sub Function - 1. void initialize(void)
void initialize(void) {

	// *Fosc = 11.0592MHz
	
	//----------------------------------------------------	
	TMOD  = 0x22; 	// Timer 0/1 : Mode 2<Auto Reload>
					
    
	TH0   = 0x78;   // TH0 for Auto-reload
					// (Fosc/11.0592MHz)^-1*(256-TH0) = Timing Duty
					// When Fosc = 11.0592MHz and TH0 = 0x78,
					// Timing Duty is 0.125msec (124.7 usec)
		
	
	TF0 = 0;
	
	ET0 = 1;		// Timer 0 Interrupt Enable
	
	
	//----------------------------------------------------
	SM0 = 0;		// SM0,SM1 = [0,1] : UART Mode 1 (8-bit UART)
	SM1 = 1;
	
	//CKCON |= 0x10;	// T1M = 1;
		
	TH1   = 0xFD;	// Refer to the UART table at Brief Manual of MiDAS1.0 Family.
		
	REN	  = 1;		// Reception Enable 
	
	TF1   = 0;		  
	
	PS    = 1;		// UART Priority Enable
	
	ES    = 1;		// UART Interrupt (Commnucation) Enable	
	
	
	
	//----------------------------------------------------
	EA =  1;		// All Interrupts Enable
	
	
	//----------------------------------------------------
	// The Initialization of Variables
	pcode = (unsigned char xdata *)0x0000;
	display_count = 0;
	loop_cnt = 0;

} // End: void initialize(void)






// Sub Function : Timer 0 Interrupt
void timer0_int(void) interrupt TF0_VECTOR {
	
	
	// 7-segment Display	
	if (loop_cnt == 4000) {	 // 2000 : 0.25sec, 4000 : 0.50sec (Time Duty : 0.125msec)

		loop_cnt = 0;
		
		switch (display_count) {
			case 0 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D0;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 1 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D1;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 2 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D2;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 3 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D3;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 4 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D4;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
				
			case 5 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D5;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 6 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D6;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
				
				
			case 7 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D7;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 8 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D8;		// Refer to timer.h file about MACRO "D0".
				display_count++;
				break;
								
			case 9 :
				pcode = (unsigned char xdata *) 0xF600;		// Port B (7-segment Display)
				*(pcode) = D9;		// Refer to timer.h file about MACRO "D0".
				display_count = 0;
				break;							
		}
		
	}
	
	loop_cnt++;
	TF0 = 0;					 // Timer 0 Overflow Falg Clear

}



// Sub Function : UART Interrupt (Serial Communication)
void uart_int(void) interrupt SIO_VECTOR {

	while (1) {
	
		if (TI) {				// Transmit Mode
			TI = 0;
			break;
			
		} else if (RI) {		// Receive Mode
			received_data = SBUF;
			
			SBUF = received_data; // Resend to Serial Port
			
			PutChar(received_data);

			if(received_data == 0x03)	// ctrl+c input
				clearscreen_lcd();	
			
			RI = 0;
			break;		
		}
	}
	
}