//------------------------------------------------------------------------------------
// Hello.c
//------------------------------------------------------------------------------------
//8051 Test program to demonstrate serial port I/O.  This program writes a message on
//the console using the printf() function, and reads characters using the getchar()
//function.  An ANSI escape sequence is used to clear the screen if a '2' is typed.
//A '1' repeats the message and the program responds to other input characters with
//an appropriate message.
//
//Any valid keystroke turns on the green LED on the board; invalid entries turn it off
//------------------------------------------------------------------------------------
// Includes
//------------------------------------------------------------------------------------
#include <c8051f120.h>
#include <stdio.h>
#include "putget.h"

//------------------------------------------------------------------------------------
// Global Constants
//------------------------------------------------------------------------------------
#define EXTCLK      22118400            // External oscillator frequency in Hz
#define SYSCLK      49766400            // Output of PLL derived from (EXTCLK * 9/4)
#define BAUDRATE    115200              // UART baud rate in bps

//------------------------------------------------------------------------------------
// Function Prototypes
//------------------------------------------------------------------------------------
void main(void);
void SYSCLK_INIT(void);
void PORT_INIT(void);
void UART0_INIT(void);

//------------------------------------------------------------------------------------
// MAIN Routine
//------------------------------------------------------------------------------------
void main(void)
{
    char c;

    WDTCN = 0xDE;                       // Disable the watchdog timer
    WDTCN = 0xAD;

    PORT_INIT();                        // Initialize the Crossbar and GPIO
    SYSCLK_INIT();                      // Initialize the oscillator
    UART0_INIT();                       // Initialize UART0

    SFRPAGE = UART0_PAGE;               // Direct output to UART0

	printf("\033[33;44m");
    printf("\033[2J");                  // Erase screen & move cursor to home position
    printf("\033[2;25H");                  // row 2 col 20
	printf("Type <ESC> to end the program\n");
    printf("\033[13;25r");                  // scroll section 13-25



	c = getchar();
	printf("\033[13;1H");			// jump to begining of scroll section
	while(c!= 0x1B){



		if(c<' ' || c > '~'){
			printf("Character %02X is \033[4mnot printable\033[0;33;44m\n\r",c);// escape is for underline / reset


		}else{
			printf("\033[s");// save
			printf("\033[6;1H");// line 6
			printf("Keyboard character is \033[37m%c\033[33m.\n",c);// print key line, key is white

			printf("\033[u");// load
		}

		c = getchar();

    }

}

//------------------------------------------------------------------------------------
// SYSCLK_Init
//------------------------------------------------------------------------------------
//
// Initialize the system clock to use a 22.1184MHz crystal as its clock source
//
void SYSCLK_INIT(void)
{
    int i;
    char SFRPAGE_SAVE;

    SFRPAGE_SAVE = SFRPAGE;             // Save Current SFR page

    SFRPAGE = CONFIG_PAGE;
    OSCXCN  = 0x67;                     // Start ext osc with 22.1184MHz crystal
    for(i=0; i < 256; i++);             // Wait for the oscillator to start up
    while(!(OSCXCN & 0x80));
    CLKSEL  = 0x01;
    OSCICN  = 0x00;

    SFRPAGE = CONFIG_PAGE;
    PLL0CN  = 0x04;
    SFRPAGE = LEGACY_PAGE;
    FLSCL   = 0x10;
    SFRPAGE = CONFIG_PAGE;
    PLL0CN |= 0x01;
    PLL0DIV = 0x04;
    PLL0FLT = 0x01;
    PLL0MUL = 0x09;
    for(i=0; i < 256; i++);
    PLL0CN |= 0x02;
    while(!(PLL0CN & 0x10));
    CLKSEL  = 0x02;

    SFRPAGE = SFRPAGE_SAVE;             // Restore SFR page
}

//------------------------------------------------------------------------------------
// PORT_Init
//------------------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports
//
void PORT_INIT(void)
{
    char SFRPAGE_SAVE;

    SFRPAGE_SAVE = SFRPAGE;             // Save Current SFR page

    SFRPAGE  = CONFIG_PAGE;
    XBR0     = 0x04;                    // Enable UART0
    XBR1     = 0x00;
    XBR2     = 0x40;                    // Enable Crossbar and weak pull-up
    P0MDOUT |= 0x01;                    // Set TX0 on P0.0 pin to push-pull
    P1MDOUT |= 0x40;                    // Set green LED output P1.6 to push-pull

    SFRPAGE  = SFRPAGE_SAVE;            // Restore SFR page
}

//------------------------------------------------------------------------------------
// UART0_Init
//------------------------------------------------------------------------------------
//
// Configure the UART0 using Timer1, for <baudrate> and 8-N-1
//
void UART0_INIT(void)
{
    char SFRPAGE_SAVE;

    SFRPAGE_SAVE = SFRPAGE;             // Save Current SFR page

    SFRPAGE = TIMER01_PAGE;
    TMOD   &= ~0xF0;
    TMOD   |=  0x20;                    // Timer1, Mode 2, 8-bit reload
    TH1     = -(SYSCLK/BAUDRATE/16);    // Set Timer1 reload baudrate value T1 Hi Byte
    CKCON  |= 0x10;                     // Timer1 uses SYSCLK as time base
    TL1     = TH1;
    TR1     = 1;                        // Start Timer1

    SFRPAGE = UART0_PAGE;
    SCON0   = 0x50;                     // Mode 1, 8-bit UART, enable RX
    SSTA0   = 0x10;                     // SMOD0 = 1
    TI0     = 1;                        // Indicate TX0 ready

    SFRPAGE = SFRPAGE_SAVE;             // Restore SFR page
}