帮我写一个用粤嵌gec6818开发板写的密码锁的程序

好的，以下是一个使用粤嵌gec6818开发板的密码锁的示例程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "stm32f4xx.h"
#include "stm32f4xx_conf.h"
#include "usart.h"
#include "delay.h"
#include "key.h"
#include "led.h"
#include "lcd.h"
#include "sim900a.h"
#include "password.h"


#define PASSWORD_LENGTH 6
#define MAX_PASSWORD_ATTEMPTS 3

volatile uint8_t g_password[PASSWORD_LENGTH] = {1, 2, 3, 4, 5, 6};
volatile uint8_t g_password_index = 0;
volatile uint8_t g_password_attempts = 0;
volatile uint8_t g_lock_open = 0;

int main(void)
{
    delay_init();
    usart_init();
    key_init();
    led_init();
    lcd_init();
    sim900a_init();

    lcd_show_string(0, 0, "Welcome to Password Lock!");

    while (1)
    {
        if (g_lock_open)
        {
            lcd_show_string(0, 1, "Lock Open!");
            led_on(LED_GREEN);
        }
        else
        {
            lcd_show_string(0, 1, "Lock Closed");
            led_off(LED_GREEN);
        }

        if (!sim900a_check_sms())
        {
            continue;
        }

        char *sms_content = sim900a_read_sms();
        if (sms_content != NULL && strncmp(sms_content, "OPEN", 4) == 0)
        {
            g_lock_open = 1;
            sim900a_send_sms("Lock Opened!");
        }
        else if (sms_content != NULL && strncmp(sms_content, "CLOSE", 5) == 0)
        {
            g_lock_open = 0;
            sim900a_send_sms("Lock Closed!");
        }
        else if (sms_content != NULL && strncmp(sms_content, "PWD", 3) == 0)
        {
            char *password_str = strtok(sms_content + 3, ",");
            uint8_t password[PASSWORD_LENGTH];
            uint8_t password_index = 0;
            while (password_str != NULL && password_index < PASSWORD_LENGTH)
            {
                password[password_index] = atoi(password_str);
                password_str = strtok(NULL, ",");
                password_index++;
            }

            if (password_index == PASSWORD_LENGTH && memcmp(password, g_password, PASSWORD_LENGTH) == 0)
            {
                g_password_attempts = 0;
                g_password_index = 0;
                g_lock_open = 1;
                sim900a_send_sms("Lock Opened!");
            }
            else
            {
                g_password_attempts++;
                if (g_password_attempts >= MAX_PASSWORD_ATTEMPTS)
                {
                    sim900a_send_sms("Too many password attempts! Lock closed!");
                    g_lock_open = 0;
                }
                else
                {
                    sim900a_send_sms("Wrong password! Please try again");
                }
            }
        }

        delay_ms(1000);
    }
}

这个程序使用了粤嵌gec6818开发板上的各种模块，包括LCD显示、LED灯、SIM900A模块等。它实现了一个简单的密码锁，可以通过短信远程控制开锁，同时还支持密码开锁。在实际应用中，可以根据需要对密码锁进行二次开发，增加更多的功能。