Design of Fingerprint Recognition System Based on Single Chip Microcomputer

1. Circuit Design

This circuit consists of a minimum system board, LCD1602 liquid crystal module and AS608 fingerprint module.

2. Operation Effect

3. Main Code

/*Want more projects private wo!!!*/

#include "sys.h"

#include "delay.h"

#include "usart.h"

#include "lcd.h"

#include "key.h"

#include "touch.h"   

#include "malloc.h" 

#include "usmart.h"  

#include "MMC_SD.h"   

#include "ff.h"  

#include "exfuns.h"    

#include "fontupd.h"

#include "text.h"

#include "usart2.h"

#include "AS608.h"

#include "timer.h"

#define usart2_baund 57600 //Serial port 2 baud rate, change according to the baud rate of the fingerprint module

SysPara AS608Para; //Fingerprint module AS608 parameters

u16 ValidN; //Number of valid templates in the module

u8** kbd_tbl;

const u8* kbd_menu[15]={"del_fp"," : ","add_fp","1","2","3","4","5","6","7","8","9","DEL","0","Enter",}; //Key table

const u8* kbd_delFR[15]={"BACK"," : ","del_all","1","2","3","4","5","6","7","8","9","DEL","0","Enter",}; //Key table

void Add_FR(void); //Record fingerprint

void Del_FR(void); //Delete fingerprint

void press_FR(void);//Swipe fingerprint

void ShowErrMessage(u8 ensure);//Display confirmation code error message

void AS608_load_keyboard(u16 x,u16 y,u8 **kbtbl); //load virtual keyboard

u8 AS608_get_keynum(u16 x,u16 y);//Get the keyboard number

u16 GET_NUM(void); //Get the value  

int main(void)

{  

u8 ensure;

u8 key_num;

char *str;

  Stm32_Clock_Init(9); //System clock settings

delay_init(72);   //delay initialization

uart_init(72,115200); //Serial port 1 initialization, used to support USMART    

LCD_Init(); //Initialize LCD 

KEY_Init(); //Key initialization       

usmart_dev.init(72); //initialize usmart

  usart2_init(36,usart2_baund); //Initialize serial port 2 for communication with fingerprint module

PS_StaGPIO_Init();   //Initialize FR read status pin

tp_dev.init(); //Touch screen initialization

  mem_init(); //Initialize memory pool     

  exfuns_init(); //Apply for memory for fatfs related variables  

  f_mount(fs[1],"1:",1); //Mount FLASH.

POINT_COLOR=RED;

while(font_init()) //Check font library

{     

LCD_ShowString(60,50,240,16,16,"Font Error!");

delay_ms(200);   

LCD_Fill(60,50,240,66,WHITE); //Clear display

delay_ms(200);

}

if(!(tp_dev.touchtype&0x80))//If it is a resistive screen

{

Show_Str_Mid(0,30,"Adjust the touch screen?",16,240);

POINT_COLOR=BLUE;

Show_Str_Mid(0,60,"YES: KEY1 NO: KEY0",16,240);

while(1)

{

key_num=KEY_Scan(0);

if(key_num==KEY0_PRES)

break;

if(key_num==KEY1_PRES)

{

LCD_Clear(WHITE);

TP_Adjust();  //Screen calibration 

TP_Save_Adjdata(); //Save calibration parameters

break;

}

}

}

/*Load fingerprint recognition experiment interface*/

LCD_Clear(WHITE);

POINT_COLOR=RED;

Show_Str_Mid(0,0,"AS608 Fingerprint module test",16,240);          

Show_Str_Mid(0,20,"Author: @ALIENTEK",16,240);      

  POINT_COLOR=BLUE;

Show_Str_Mid(0,40,"Connect with AS608....",16,240);

while(PS_HandShake(&AS608Addr)) //Handshake with AS608 module

{

LCD_Fill(0,40,240,80,WHITE);

Show_Str_Mid(0,40,"Cannot connect with AS608!",16,240);

delay_ms(1000);

LCD_Fill(0,40,240,80,WHITE);

Show_Str_Mid(0,40,"Try to connect again....",16,240);

delay_ms(1000);   

}

LCD_Fill(0,40,240,320,WHITE);

Show_Str_Mid(0,40,"Connect success!",16,240);//Communication successful

str = mymalloc(30);

sprintf(str,"Baudrate:%d Addr:%x",usart2_baund,AS608Addr);//Display baud rate

Show_Str(0,60,240,16,(u8*)str,16,0);

delay_ms(100);

ensure=PS_ValidTempleteNum(&ValidN); //Read the number of fingerprints in the library

if(ensure!=0x00)

ShowErrMessage(ensure); //Show confirmation code error message

ensure=PS_ReadSysPara(&AS608Para); //Read AS608 module parameters 

if(ensure==0x00)

{

mymemset(str,0,50);

sprintf(str,"RemainNum:%d Level:%d",AS608Para.PS_max-ValidN,AS608Para.PS_level); //Display the number of remaining fingerprints and security level

Show_Str(0,80,240,16,(u8*)str,16,0);

}

else

ShowErrMessage(ensure);

myfree(str);

AS608_load_keyboard(0,170,(u8**)kbd_menu); //Load virtual keyboard

while(1)

{

key_num=AS608_get_keynum(0,170);

if(key_num)

{

if(key_num==1)Del_FR(); //delete fingerprint

if(key_num==3)Add_FR(); //Record fingerprint

}

if(PS_Sta) //Check PS_Sta status, if a finger is pressed

{

press_FR(); //Swipe fingerprint

}  

}

}