Linux下DNW源码及安装

1.首先要安装libusb-dev这个库,执行“sudo apt-get install libusb-dev”，装完之后就编译一个下载工具，网上有个牛人提供了一个。代码如下：

CODE:

/*
* dnw.c linux main file. This depends on libusb.
* Author: Fox <[e-mail]>
* License: GPL
*/
#include <stdio.h>
#include <usb.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define QQ2440_SECBULK_IDVENDOR 0x5345
#define QQ2440_SECBULK_IDPRODUCT 0x1234


struct usb_dev_handle * open_port()
{
    struct usb_bus *busses, *bus;

    usb_init();
    usb_find_busses();
    usb_find_devices();

    busses = usb_get_busses();
    for(bus=busses;bus;bus=bus->next)
    {
        struct usb_device *dev;
        for(dev=bus->devices;dev;dev=dev->next)
        {
            printf("idVendor:0x%x\t,ipProduct:0x%x\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
            if( QQ2440_SECBULK_IDVENDOR==dev->descriptor.idVendor&& QQ2440_SECBULK_IDPRODUCT==dev->descriptor.idProduct)
            {
                printf("Target usb device found!\n");
                struct usb_dev_handle *hdev = usb_open(dev);
                if(!hdev)
                {
                    perror("Cannot open device");
                }
                else
                {
                    if(0!=usb_claim_interface(hdev, 0))
                    {
                        perror("Cannot claim interface");
                        usb_close(hdev);
                        hdev = NULL;
                    }
                }
                return hdev;
            }
        }
    }

    printf("Target usb device not found!\n");

    return NULL;
}

void usage(void)
{
    printf("Usage: dnw \n\n");
}

unsigned char* prepare_write_buf(char *filename, unsigned int *len)
{
    unsigned char *write_buf = NULL;
    struct stat fs;

    int fd = open(filename, O_RDONLY);
    if(-1==fd)
    {
        perror("Cannot open file");
        return NULL;
    }
    if(-1==fstat(fd, &fs))
    {
        perror("Cannot get file size");
        goto error;
    }
    write_buf = (unsigned char*)malloc(fs.st_size+10);
    if(NULL==write_buf)
    {
        perror("malloc failed");
        goto error;
    }

    if(fs.st_size != read(fd, write_buf+8, fs.st_size))
    {
        perror("Reading file failed");
        goto error;
    }

    printf("Filename : %s\n", filename);
    printf("Filesize : %d bytes\n", fs.st_size);

    *((u_int32_t*)write_buf) = 0x30000000; //download address
    *((u_int32_t*)write_buf+1) = fs.st_size + 10; //download size;

    *len = fs.st_size + 10;
    return write_buf;

error:
    if(fd!=-1)
        close(fd);
    if(NULL!=write_buf)
        free(write_buf);
    fs.st_size = 0;
    return NULL;
}

int main(int argc, char *argv[])
{
    if(2!=argc)
    {
        usage();
        return 1;
    }

    struct usb_dev_handle *hdev = open_port();
    if(!hdev)
    {
        return 1;
    }

    unsigned int len = 0;
    unsigned char* write_buf = prepare_write_buf(argv[1], &len);
    if(NULL==write_buf)
        return 1;

    unsigned int remain = len;
    unsigned int towrite;
    printf("Writing data ...\n");
    while(remain)
    {
        towrite = remain>512 ? 512 : remain;
        if(towrite != usb_bulk_write(hdev, 0x03, write_buf+(len-remain), towrite, 3000))
        {
            perror("usb_bulk_write failed");
            break;
        }
        remain-=towrite;
        printf("\r%d%\t %d bytes ", (len-remain)*100/len, len-remain);
        fflush(stdout);
    }
    if(0==remain)
        printf("Done!\n");
    return 0;
}

2.把它保存为文件dnw.c,编译“gcc dnw2.c -o dnw -lusb”，编译完得到的dnw就是usb下载的PC端了。下载时用“dnw ”下载文件到板上。也可生成的链接文件“sudo ln -s ./dnw /usr/sbin/dnw”，这样在编译完要下载文件就可以直接下载了。