解决自动化测试设备掉线：软件方案

草帽路飞UU 发表于 2017-6-29 09:14:06

本着折腾精神，这几天收集了一些软件方案，现总结下，方便碰到同样问题的小伙伴参考。
windows软件解决方案
[*]命令行实现：

[*]参考：> http://digital.ni.com/public.nsf/allkb/1D120A90884C25AF862573A700602459
[*]原理：使用devcon工具，重启设备
[*]代码： devcon restart *设备实例路径*
设备实例路径查看办法：win+r打开运行窗口 ——> 输入devmgmt.msc打开设备管理器 ——> 选择你的设备双击 ——> 切换到属性tab页 ——> 在属性下拉框选择设备实例路径
https://testerhome.com/uploads/photo/2017/d89bab6f-d24a-4aeb-bf0b-74e02ac5cc69.png%21large
linux/ubuntu软件解决方案
[*]python代码实现：

[*]原理：ioctl
[*]代码：
# coding:utf-8
import os
import fcntl
import subprocess
USBDEVFS_RESET = ord('U') << (4 * 2) | 20
def get_adb_usb_devices():
lines = os.popen('lsusb').readlines()
target_lines = []
for line in lines:
   if 'MediaTek' in line or 'Spreadtrum' in line or 'Qualcomm' in line:
         target_lines.append(line)
adb_usb_devices = []
for line in target_lines:
   parts = line.split()
   # print parts
   bus = parts
   dev = parts[:3]
   adb_usb_devices.append('/dev/bus/usb/%s/%s' % (bus, dev))
return adb_usb_devices
def send_reset(adb_device_path):
fd = os.open(adb_device_path, os.O_WRONLY)
print fd
try:
   ret = fcntl.ioctl(fd, USBDEVFS_RESET, 0)
finally:
   os.close(fd)
if ret < 0:
   return False
else:
   return True
def main():
# 请求root权限
if (os.getuid() != 0):
   exe = subprocess.Popen(['sudo', 'python', __file__])
   exe.wait()
   exit(1)
# 打印信息
print '-' * 75
print 'Usage : USB device Reset Tool for android QCom|Sprd|MTK device'
print 'Coder: Wanyor'
print '-' * 75
adb_usb_devices = get_adb_usb_devices()
print 'usb:', adb_usb_devices
for adb_device_path in adb_usb_devices:
            if (send_reset(adb_device_path)):
               print 'Reset {0} Success!'.format(adb_device_path)
            else:
               print 'Reset {0} Fail!'.format(adb_device_path)
if __name__ == '__main__':
main()
[*]c语言编写cli程序实现：

[*]原理：ioctl
[*]代码：
usbreset.c

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
int main(int argc, char **argv)
{
const char *filename;
int fd;
int rc;
if (argc != 2) {
   fprintf(stderr, "Usage: usbreset device-filename\n");
   return 1;
}
filename = argv;
fd = open(filename, O_WRONLY);
if (fd < 0) {
   perror("Error opening output file");
   return 1;
}
printf("Resetting USB device %s\n", filename);
rc = ioctl(fd, USBDEVFS_RESET, 0);
if (rc < 0) {
   perror("Error in ioctl");
   return 1;
}
printf("Reset successful\n");
close(fd);
return 0;
}
然后用gcc usbreset.c -o usbreset编译下，sudo chmod a+x usbreset给cli程序执行权限即可运行，参数为设备的挂载路径（例如：/dev/bus/usb/002/007）
设备挂载路径查看办法：lsusb即可查看
跨平台解决方案
[*]libusb库实现：

[*]原理：libusb自带usb_reset函数，写个c代码调用下就可以了
[*]代码：
usbreset.c
#include <stdio.h>
#include <stdlib.h>
#include <libusb-1.0/libusb.h>
//compile: gcc usbreset.c -o usbreset -lusb-1.0
//usage: ./usbreset 2
//use lsusb to check out the bus number and device number
struct libusb_device_handle *devh;
struct libusb_device *dev;
struct libusb_device **devs;

void resetUSB() {

int success;
int bpoint = 0;

do {
   success = libusb_reset_device(devh);
   if ((bpoint % 10) == 0) {
         printf(".");
   }

   ++bpoint;

   if (bpoint > 100) {
         success = 1;
   }
} while (success < 0);

if (success) {
   printf("nreset usb device failed:%dn", success);
} else {
   printf("nreset usb device okn");
}
｝
struct libusb_device* search_device(int _busNum, int _devNum) {

libusb_device *l_dev;
int i = 0;
int l_busNum, l_devNum;

while ((l_dev = devs) != NULL) {
   printf("check against %d devicen", i);
   l_busNum =(int) libusb_get_bus_number(l_dev);
   l_devNum =(int) libusb_get_device_address(l_dev);
   printf("bus number: %d; device number: %dn", l_busNum, l_devNum);
   if ((l_busNum == _busNum) && (l_devNum == _devNum)) {
         printf("found devicen");
         return l_dev;
   }
}
return NULL;
}
int main(int argc, char **argv) {
//parse the input parameters to get the bus number and device number
int l_busNum, l_devNum;
int l_ret;
printf("program started!n");
if (argc < 3) {
   printf("not enough arguments!n");
   printf("usage: ./usbreset <bus number> <dev number>n");
   return 0;
}
printf("bus number: %sn", argv);
printf("dev number: %sn", argv);

l_busNum = atoi(argv);
l_devNum = atoi(argv);
printf("bus number: %d; dev number: %dn", l_busNum, l_devNum);

l_ret = libusb_init(NULL);
if (l_ret < 0) {
   return l_ret;
}
l_ret = libusb_get_device_list(NULL, &devs);
if (l_ret < 0) {
   return (int) l_ret;
}
dev = search_device(l_busNum, l_devNum);
if (dev == NULL) {
   printf("device not foundn");
   return 0;
}
l_ret = libusb_open(dev, &devh);
if (l_ret == 0) {
   printf("got the usb handle successfully.n");
} else {
   printf("error getting usb handle.n");
}
//reset the usb device
resetUSB();
//free the device list
libusb_free_device_list(devs, 1);
libusb_exit(NULL);
return 0;
}使用gcc usbreset.c -o usbreset -lusb-1.0编译下，sudo chmod a+x usbreset给cli程序执行权限即可运行，参数为设备的bus id和device id
跨平台方案也可以使用python的libusb的cython封装写，各位小伙伴可自由尝试。
汇报完毕，硬件方案正在买元件，画pcb，找时间再更..

乐哈哈yoyo 发表于 2017-6-29 09:49:35

我认为adb掉线的原因是电源供电不足，这是其一，后面我在STF官网上面看到他们的分析另一个原因是usb3.0驱动与adb间的问题，只要选择使用usb2.0的usb-hub就可以了。已经通过实践证明，双管齐下后usb都很正常。

八戒你干嘛 发表于 2017-6-29 09:50:22

乐哈哈yoyo 发表于 2017-6-29 09:49
我认为adb掉线的原因是电源供电不足，这是其一，后面我在STF官网上面看到他们的分析另一个原因是usb3.0驱 ...

嗯，见解很到位！

八戒你干嘛 发表于 2017-6-29 09:50:27

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解决自动化测试设备掉线：软件方案