$/***$ RFID.c

$*$ COMP $551$ LAB $11$ RFID Module

$*$ PIC$18$F$458$ Microchip MPLAB C$18$

$*$ Lakshya Kapoor $(10323795)$ & Sharath Varma Nallapuraju $(10317230)$

$*$ December $8,2023$

$*$ This program is about running the RFID Module

$*$ This program is strictly in my own work. Any material

$*$ beyond course learning materials that is taken from

$*$ the Web or other sources is properly cited, giving

$*$ credit to the original author$($s$).$

$***/$

#include

#include "millis$\_551.$h$"$

#pragma config OSC $=$ HS$,$ OSCS $=$ OFF

#pragma config PWRT $=$ OFF, BOR $=$ ON$,$ BORV $=45$

#pragma config WDT $=$ OFF

#pragma config DEBUG $=$ OFF, LVP $=$ OFF, STVR $=$ OFF

$//$ Boolean values

#define FALSE $(0)$

#define TRUE $(!$FALSE$)$

$//$ LCD CMD and DATA pins

#define CMD$\_$PIN PORTBbits.RB$0$

#define RW$\_$PIN PORTBbits.RB$1$

#define EN$\_$PIN PORTBbits.RB$2$

#define CMD$\_$PORT PORTB

#define CMD$\_$PORT$\_$TRIS TRISB

#define CMD$\_$PORT$\_$TRIS$\_$VALUE $(($unsigned char$)$~$0$x$07)$

$//$ Data

#define DATA$\_$PORT PORTD

#define DATA$\_$PORT$\_$TRIS TRISD

$//$ Important constants

#define NCHARS $12//$ number of digits in RFID code

#define BAUD$\_$DIVISOR $129//$ value for baud rate generator $($BRGH $=1)$

const unsigned char data$[]=""$;

enum State

$\{$

WAIT,

RECEIVING,

DISPLAY

$\}$;

enum State state $=$ WAIT;

unsigned int deadline $=0$;

$//$ Function prototypes

void lcd$\_$ini$($void$)$; $//$ initialize LCD module

void delay$\_$ms$($unsigned int milliseconds$)$; $//$ YOU FILL IN OTHER LCD FUNCTIONS FROM LAB $10$

const unsigned char BANNER$[]=$ "LAKSHYA $3795"$; $//$ Define message array

unsigned char card$\_$id$[$NCHARS$]$; $//$ Define "card$\_$ID$"$ array

unsigned int char$\_$counter $=0$;

void delay$\_$ms$($unsigned int milliseconds$)$

$\{$

unsigned int deadline $=$ millis$()+$ milliseconds;

while$($millis$()<$ deadline$)$ ;

$\}$

void lcdcmd$($unsigned char command$)$

$\{$

CMD$\_$PIN $=0$;

delay$\_$ms$(2)$;

RW$\_$PIN $=0$;

delay$\_$ms$(2)$;

EN$\_$PIN $=1$;

delay$\_$ms$(2)$;

PORTD $=$ command;

delay$\_$ms$(2)$;

EN$\_$PIN $=0$;

delay$\_$ms$(2)$;

$\}$

void lcddata$($unsigned char data$)$

$\{$

CMD$\_$PIN $=1$;

delay$\_$ms$(2)$;

RW$\_$PIN $=0$;

delay$\_$ms$(2)$;

EN$\_$PIN $=1$;

delay$\_$ms$(2)$;

PORTD $=$ data;

delay$\_$ms$(2)$;

EN$\_$PIN $=0$;

delay$\_$ms$(2)$;

$\}$

void printer$($const char $*$ const text, unsigned char startPos$)$

$\{$

int i;

lcdcmd$($startPos$)$;

delay$\_$ms$(2)$;

for $($i $=0$; text$[$i$]$; i$++)$

$\{$

lcddata$($text$[$i$])$;

delay$\_$ms$(2)$;

$\}$

$\}$ You will combine part of lab $11$ and part of lab $10$ for this bonus assignment. It will require use

of RFID and a state machine to receive and display the card ID on the second line as in lab $10,$

but the $$OK$$ or $$BAD$$ display will be delayed unGl aHer a Gmer counts down on the $1$st line

$($similar to Lab $10).$

To accomplish this you will have to modify the state machine as follows:

In the DISPLAY state, you should only display the ID $($DO NOT PRINT OK or BAD$),$ and set a $2$

second Gmer deadline.

If another character is received within $2$ seconds, go back to RECEIVING state as in Lab $11.$

If the deadline elapses, instead of moving to WAIT state, move to a new COUNTDOWN state.

In the COUNTDOWN state, display a count down of $5$ to $0((1)/(2)$ second delay between counts$)$ on

the top line in the first two character locaGons. Leave one space, then display the same number

in binary, one bit per character space as $1$ or $0.$

As you are displaying the countdown on the top line, on the bo$\backslash$om line, draw a progress bar

with a single character. At $5,$ the line is blank, at $0$ the line is filled $($all $16$ characters$).$ In

between, the line is proporGonal to the number. Hint: try with the filled rectangle character $0$xff

Once the countdown has completed, display $$OK$$ or $$BAD$$ as appropriate on the first line, then

move to the WAIT state. Implement this question in the above given given code provided by me$.$