ai co the giai thich dum em doan ma code ve con chuong trình RFID

[vinh172001]

#include <16f877a.h>
//#include <def_16f877a.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP,NOBROWNOUT,PUT

#define RF_RDY_CLK PIN_C0 // External interrupt used to read clock
#define RF_SHD PIN_C1 // High disables the antenna signal
#define RF_MOD PIN_C3 // High does 100% modulation
#define RF_DEMOD_OUT PIN_C2 // Data read in interrupt service routine

#include <em4095.c> // Controls the reader IC
#include <em4102.c> // Allows reading 4102 transponders
#use delay(clock=12000000)
#use rs232(baud=9600, xmit=PIN_c6,rcv=PIN_c7)
#define LCD_ENABLE_PIN PIN_B3 ////
#define LCD_RS_PIN PIN_B1 ////
#define LCD_RW_PIN PIN_B2 ////
#define LCD_DATA4 PIN_B4 ////
#define LCD_DATA5 PIN_B5 ////
#define LCD_DATA6 PIN_B6 ////
#define LCD_DATA7 PIN_B7
#include <lcd.c>

//#byte trisb = 0x86
//#bit trisb5 = trisb.5
//#byte PORTB = 0x6
//#bit rb5 = PORTB.5
#Byte PORTA = 0x5
#bit Butt1 = PORTA.0
#bit Butt2 = PORTA.1
#bit Butt3 = PORTA.2
#bit Led1 = PORTA.3
#bit Led2 = PORTA.4
#bit Led3 = PORTA.5

#byte PORTE = 0x9
#bit Tran1 = PORTE.0
#bit Tran2 = PORTE.1

#define x_ON 1
#define x_OFF 0

int8 msg[32];

void main()
{
int8 customerCode;
int32 tagNum;
//trisb5=0;
lcd_init();
set_tris_a(0x7);
Set_tris_e(0);
rf_init(); // Initialize the RF reader // khoi tao em4095 trong thu vien em4095.c
rf_powerUp(); // Power up the antenna // phát sóng tan so 125khz
printf(lcd_putc,"\fSystem ready...");
delay_ms(1000);
while(1) {
if(read_4102(msg))
{
customerCode = msg[0];// gan 1byte la ma khach hang
tagNum = make32(msg[1], msg[2], msg[3], msg[4]);// gan 4byte tiep theo la UIA
sprintf(msg,"Customer Code: %u\n\r", customerCode);
puts(msg);
printf(lcd_putc,"\fC Code:%u\n",customerCode);
sprintf(msg, "Tag Number: %lu\n\n\r", tagNum);
puts(msg);
printf(lcd_putc,"T No:%lu",tagNum);
Led1 = x_ON;
Tran1 = x_ON;
Tran2 = x_ON;
delay_ms(1000);
Led1 = x_OFF;
Tran1 = x_OFF;
Tran2 = x_OFF;
}
}
}