Linux系统中用DNW向ARM开发板下载程序

在Linux下通过dnw来给开发板发送程序。包括驱动程序代码：secbulk.c，应用程序代码：dnw.c。只能运行在32位系统上，在64位系统上提示错误：DNW download Data size is too big。

dnw源代码：

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

const char* dev = "/dev/secbulk0";

int main(int argc, char* argv[])
{
unsigned char* file_buffer = NULL;

long int addr  =  0;

if( 3 != argc )    {
printf("Usage: dwn <filename> address\n");
return 1;
}

int fd = open(argv[1], O_RDONLY);
if(-1 == fd) {
printf("Can not open file - %s\n", argv[1]);
return 1;
}
addr = strtol((char *) argv[2] ,NULL, 16);

printf("addr = %lx \n", addr);

// get file size
struct stat file_stat;
if( -1 == fstat(fd, &file_stat) ) {
printf("Get file size filed!\n");
return 1;
}

file_buffer = (unsigned char*)malloc(file_stat.st_size+10);
if(NULL == file_buffer) {
printf("malloc failed!\n");
goto error;
}
//memset(file_buffer, '\0', sizeof(file_buffer)); // bad code ! corrected by Qulory
memset(file_buffer, '\0', sizeof(char)*(file_stat.st_size+10));

// the first 8 bytes in the file_buffer is reserved, the last 2 bytes also;
if( file_stat.st_size !=  read(fd, file_buffer+8, file_stat.st_size))    {
printf("Read file failed!\n");
goto error;
}

printf("File name : %s\n", argv[1]);
printf("File size : %ld bytes\n", file_stat.st_size);// off_t is long int

int fd_dev = open(dev, O_WRONLY);
if( -1 == fd_dev)    {
printf("Can not open %s\n", dev);
goto error;
}

/*
* Note: the first 4 bytes store the dest addr ;
* the following 4 bytes store the file size ;
* and the last 2 bytes store the sum of each bytes of the file ;
*/
*((unsigned long*)file_buffer) = addr;     //load address
*((unsigned long*)file_buffer+1) = file_stat.st_size+10;    //file size
unsigned short sum = 0;
int i;
for(i=8; i<file_stat.st_size+8; i++)    {
sum += file_buffer[i];
}

*((unsigned short*)(file_buffer+8+file_stat.st_size)) = sum;

printf("Start Sending data...\n");
size_t remain_size = file_stat.st_size+10;
size_t block_size = 512;
size_t written = 0;
while(remain_size > 0)    {
size_t to_write = remain_size > block_size ? block_size:remain_size;
size_t real_write = write(fd_dev, file_buffer+written, to_write);
if( to_write != real_write)    {
printf(" write  /dev/secbulk0 failed!");
return 1;
}
remain_size -= to_write;
written += to_write;
printf("\rSent %lu%% \t %lu bytes !", written*100/(file_stat.st_size+10),  written);
fflush(stdout);

}

printf("OK\n");
return 0;

error:
if(-1 != fd_dev) {
close(fd_dev);
}
if(fd != -1)  {
close(fd);
}
if( NULL != file_buffer ) {
free(file_buffer);
}
return -1;
}

secbulk.c源代码：

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/slab.h>

#define BULKOUT_BUFFER_SIZE 512
char *bulkout_buffer;
struct usb_device *udev;
__u8 bulk_out_endaddr;

static struct usb_device_id dnw_id_table [] = {
{ USB_DEVICE(0x5345, 0x1234) },
{ }
};

static int dnw_open(struct inode* inode, struct file *file)
{
bulkout_buffer = kmalloc(BULKOUT_BUFFER_SIZE,GFP_KERNEL);
return 0;
}

static int dnw_release (struct inode* inode, struct file *file)
{
kfree(bulkout_buffer);
return 0;
}

static ssize_t dnw_write(struct file *file, const char __user *buf, size_t len, loff_t *pos)
{
size_t to_write;
size_t total_write = 0;
size_t act_len;

while(len>0)
{
to_write = min(len,(size_t)BULKOUT_BUFFER_SIZE);

copy_from_user(bulkout_buffer,buf+total_write,to_write);

usb_bulk_msg(udev,usb_sndbulkpipe(udev,bulk_out_endaddr),bulkout_buffer,to_write,&act_len,3*HZ);

len -= to_write;
total_write += to_write;
}

return total_write;
}

static struct file_operations dnw_ops =
{
.owner =    THIS_MODULE,
.write =    dnw_write,
.open =        dnw_open,
.release =    dnw_release,
};

static struct usb_class_driver dnw_class = {
.name =        "secbulk%d",
.fops =        &dnw_ops,
.minor_base =    100,
};

static int dnw_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
/* œÓ¿ÚÉèÖÃÃèÊö */
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
int i;

interface = intf->cur_altsetting;

for(i=0;i<interface->desc.bNumEndpoints;i++)
{
endpoint = &interface->endpoint[i].desc;
if(usb_endpoint_is_bulk_out(endpoint))
{
bulk_out_endaddr =     endpoint->bEndpointAddress;
break;
}

}

usb_register_dev(intf,&dnw_class);

udev = usb_get_dev(interface_to_usbdev(intf));

}

static void dnw_disconnect(struct usb_interface *intf)
{
usb_deregister_dev(intf,&dnw_class);
}

struct usb_driver dnw_driver = {
.name        = "dnw",   /* Çý¶¯Ãû */
.probe        = dnw_probe, /* ²¶»ñº¯Êý */
.disconnect    = dnw_disconnect, /* жÔغ¯Êý */
.id_table    = dnw_id_table, /* É豞Áбí */
};

int dnw_init( void )
{
usb_register( &dnw_driver );
return 0;
}

void dnw_exit( void )
{
usb_deregister(&dnw_driver);
}

module_init(dnw_init);
module_exit(dnw_exit);
MODULE_LICENSE("GPL");

Makefile代码：

obj-m := secbulk.o

KDIR := /lib/modules/`uname -r`/build
PWD := $(shell pwd)

all:
make -C $(KDIR) M=$(PWD) modules

clean:
rm *.o* *.s* *.ko* *.mod.* *.k*