帮我写一个用粤嵌gec6818开发板写的密码锁代码

好的，我可以给你提供一个简单的密码锁代码示例，基于粤嵌 GEC6818 开发板和 C 语言开发。

首先，需要使用 GPIO 来控制锁的开关状态，使用 UART 来接收用户输入的密码。以下是代码示例：

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>

#define GPIO_BASE 0xE0200000
#define GPIO_SIZE 0x1000
#define GPH2CON *(volatile unsigned int *)(gpio_base+0x0C40)
#define GPH2DAT *(volatile unsigned int *)(gpio_base+0x0C44)

#define UART_BASE 0xEE000000
#define UART_SIZE 0x1000
#define ULCONn *(volatile unsigned int *)(uart_base+0x0000)
#define UCONn *(volatile unsigned int *)(uart_base+0x0004)
#define UFCONn *(volatile unsigned int *)(uart_base+0x0008)
#define UMCONn *(volatile unsigned int *)(uart_base+0x000C)
#define UTRSTATn *(volatile unsigned int *)(uart_base+0x0010)
#define UERSTATn *(volatile unsigned int *)(uart_base+0x0014)
#define UFSTATn *(volatile unsigned int *)(uart_base+0x0018)
#define UMSTATn *(volatile unsigned int *)(uart_base+0x001C)
#define UTXHn *(volatile unsigned char *)(uart_base+0x0020)
#define URXHn *(volatile unsigned char *)(uart_base+0x0024)
#define UBRDIVn *(volatile unsigned int *)(uart_base+0x0028)
#define UFRACVALn *(volatile unsigned int *)(uart_base+0x002C)

#define UART_BAUD_RATE 9600

int main(int argc, char **argv) {
    // 初始化 GPIO
    int gpio_fd = open("/dev/mem", O_RDWR|O_SYNC);
    if (gpio_fd < 0) {
        perror("open failed");
        return -1;
    }
    void *gpio_map = mmap(NULL, GPIO_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, gpio_fd, GPIO_BASE);
    if (gpio_map == MAP_FAILED) {
        perror("mmap failed");
        close(gpio_fd);
        return -1;
    }
    volatile unsigned int *gpio_base = (volatile unsigned int *)gpio_map;
    GPH2CON = 0x00001111; // 设置 GPH2 为输出模式

    // 初始化 UART
    int uart_fd = open("/dev/ttySAC1", O_RDWR|O_NOCTTY);
    if (uart_fd < 0) {
        perror("open failed");
        close(gpio_fd);
        munmap((void *)gpio_base, GPIO_SIZE);
        return -1;
    }
    struct termios uart_cfg;
    tcgetattr(uart_fd, &uart_cfg);
    uart_cfg.c_cflag = B115200|CS8|CLOCAL|CREAD;
    uart_cfg.c_iflag = IGNPAR;
    uart_cfg.c_oflag = 0;
    uart_cfg.c_lflag = 0;
    tcflush(uart_fd, TCIFLUSH);
    tcsetattr(uart_fd, TCSANOW, &uart_cfg);
    UBRDIVn = 50; // 设置波特率为 9600bps

    // 设置密码
    char password[6] = "123456";

    // 读取用户输入的密码
    char input[6];
    memset(input, 0, sizeof(input));
    int i = 0;
    while (1) {
        if (UTRSTATn & (1 << 0)) {
            char c = URXHn;
            if (c == '\r' || c == '\n') {
                break;
            }
            if (i < 5) {
                input[i++] = c;
            }
        }
    }

    // 比较密码
    if (strcmp(password, input) == 0) {
        GPH2DAT = 0x0002; // 开锁
        sleep(1);
        GPH2DAT = 0x0001; // 锁上
    } else {
        printf("Wrong password!\n");
    }

    // 关闭文件和解除内存映射
    close(uart_fd);
    close(gpio_fd);
    munmap((void *)gpio_base, GPIO_SIZE);

    return 0;
}

注意：以上代码只是一个简单的示例，实际应用中需要进行更多的错误处理和优化。同时，为了保证代码的安全性和稳定性，建议您在开发过程中遵循相关规范和要求。