基于51单片机的指纹锁

基于51单片机的指纹锁是一种使用C语言编写的嵌入式系统，它可以通过指纹识别来控制门锁的开关。下面是一个简单的基于51单片机的指纹锁的代码示例：

#include <reg51.h>
#include <stdio.h>
#include <string.h>

#define FINGERPRINT_ADDRESS 0x01

unsigned char fingerprint_data[256];

void uart_init() {
    TMOD = 0x20;
    TH1 = 0xFD;
    SCON = 0x50;
    TR1 = 1;
}

void uart_send(unsigned char data) {
    SBUF = data;
    while (!TI);
    TI = 0;
}

unsigned char uart_receive() {
    while (!RI);
    RI = 0;
    return SBUF;
}

void fingerprint_send_command(unsigned char command, unsigned char parameter) {
    uart_send(0xEF);
    uart_send(FINGERPRINT_ADDRESS);
    uart_send(command);
    uart_send(parameter);
    uart_send((0xEF + FINGERPRINT_ADDRESS + command + parameter) & 0xFF);
}

unsigned char fingerprint_receive_response(unsigned char *response) {
    unsigned char i;
    unsigned char checksum = 0;
    while (uart_receive() != 0xEF);
    if (uart_receive() != FINGERPRINT_ADDRESS) {
        return 0;
    }
    if (uart_receive() != 0x01) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    if (uart_receive() != 0x00) {
        return 0;
    }
    response[0] = uart_receive();
    response[1] = uart_receive();
    response[2] = uart_receive();
    response[3] = uart_receive();
    for (i = 0; i < 10; i++) {
        checksum += response[i];
    }
    if (uart_receive() != (checksum & 0xFF)) {
        return 0;
    }
    return 1;
}

void fingerprint_enroll(unsigned char id) {
    unsigned char response[12];
    fingerprint_send_command(0x01, id);
    if (fingerprint_receive_response(response)) {
        if (response[0] == 0x00) {
            printf("Place your finger on the sensor.\n");
            while (!fingerprint_receive_response(response));
            if (response[0] == 0x00) {
                printf("Remove your finger from the sensor.\n");
                while (!fingerprint_receive_response(response));
                if (response[0] == 0x00) {
                    printf("Place your finger on the sensor again.\n");
                    while (!fingerprint_receive_response(response));
                    if (response[0] == 0x00) {
                        printf("Enrollment successful.\n");
                    } else {
                        printf("Enrollment failed.\n");
                    }
                } else {
                    printf("Enrollment failed.\n");
                }
            } else {
                printf("Enrollment failed.\n");
            }
        } else {
            printf("Enrollment failed.\n");
        }
    } else {
        printf("Enrollment failed.\n");
    }
}

void fingerprint_verify(unsigned char id) {
    unsigned char response[12];
    fingerprint_send_command(0x02, id);
    if (fingerprint_receive_response(response)) {
        if (response[0] == 0x00) {
            printf("Verification successful.\n");
        } else {
            printf("Verification failed.\n");
        }
    } else {
        printf("Verification failed.\n");
    }
}

void fingerprint_delete(unsigned char id) {
    unsigned char response[12];
    fingerprint_send_command(0x04, id);
    if (fingerprint_receive_response(response)) {
        if (response[0] == 0x00) {
            printf("Deletion successful.\n");
        } else {
            printf("Deletion failed.\n");
        }
    } else {
        printf("Deletion failed.\n");
    }
}

void main() {
    unsigned char command;
    unsigned char id;
    uart_init();
    while (1) {
        printf("Enter command (1 = enroll, 2 = verify, 3 = delete): ");
        command = getchar();
        printf("\n");
        switch (command) {
            case '1':
                printf("Enter ID (0-255): ");
                scanf("%d", &id);
                printf("\n");
                fingerprint_enroll(id);
                break;
            case '2':
                printf("Enter ID (0-255): ");
                scanf("%d", &id);
                printf("\n");
                fingerprint_verify(id);
                break;
            case '3':
                printf("Enter ID (0-255): ");
                scanf("%d", &id);
                printf("\n");
                fingerprint_delete(id);
                break;
            default:
                printf("Invalid command.\n");
                break;
        }
    }
}

这个代码示例实现了基本的指纹锁功能，包括指纹录入、指纹验证和指纹删除。当用户输入不同的命令时，程序会调用不同的函数来执行相应的操作。在这个示例中，我们使用了串口通信来与指纹模块进行通信，通过发送和接收指令来实现指纹识别的功能。