标签 RPi 下的文章

在某东入手了一块Tenda W311M USB无线网卡准备给RPi使用。插上之后lsusb查看
```sh
pi@raspberrypi:~ $ lsusb
Bus 001 Device 004: ID 148f:7601 Ralink Technology, Corp.
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
```
识别为148f:7601，搜索得知是MT7601，小米wifi2 小度wifi 360wifi等也使用同样的芯片。

普通的STA模式即接收模式现在（4.1.19-v7+）应该免驱了，ifconfig后也确实出现了wlan0，但似乎没有AP的驱动。

经搜索发现[一篇文章](http://blog.csdn.net/sumang_87/article/details/38168877 "一篇文章")，按照其中的步骤做
```sh
pi@raspberrypi:~/Downloads/mi $ git clone https://github.com/eywalink/mt7601u.git
....
pi@raspberrypi:~/Downloads/mi $ cd mt7601u/
pi@raspberrypi:~/Downloads/mi/mt7601u $ sudo ./miwifi_build.sh
```
make时出现错误
```sh
Makefile:387: recipe for target 'LINUX' failed
```
原因是没有linux-headers，而apt源中只有3.x.x版本的。当前版本的可以从[https://github.com/raspberrypi/](https://github.com/raspberrypi/ "https://github.com/raspberrypi/")或者使用[rpi-source](https://github.com/notro/rpi-source/wiki "rpi-source")获得。
```sh
sudo wget https://raw.githubusercontent.com/notro/rpi-source/master/rpi-source -O /usr/bin/rpi-source && sudo chmod +x /usr/bin/rpi-source && /usr/bin/rpi-source -q --tag-update
sudo rpi-source
```
这时应该可以make成功了。<span style="color: #ccffcc;">~~我已经忘了还遇到了哪些问题。~~></span>
此处略去dhcpd的安装和配置
```sh
pi@raspberrypi:~/Downloads/mi/mt7601u $ sudo ./miwifi_work.sh
#或者手动卸载sta和加载ap驱动
pi@raspberrypi:~ $sudo ifconfig wlan0 down
pi@raspberrypi:~ $sudo rmmod mt7601u
pi@raspberrypi:~ $sudo sudo modprobe rtnet7601Uap
pi@raspberrypi:~ $sudo modprobe mt7601Uap
pi@raspberrypi:~ $sudo modprobe rtutil7601Uap
pi@raspberrypi:~ $sudo ifconfig ra0 up

pi@raspberrypi:~ $iwconfig
```
iwconfig看了一下就懵逼了，一共ra0-ra15有16个interface，essid为HT_AP0、HT_AP1、HT_AP2…，并且其他设备并搜不到，打开日志一看有如下之类的错误
```sh
Qidx(0), not enough space in MgmtRing, MgmtRingFullCount=1!
Qidx(0), not enough space in MgmtRing, MgmtRingFullCount=2!
Qidx(0), not enough space in MgmtRing, MgmtRingFullCount=3!
Qidx(0), not enough space in MgmtRing, MgmtRingFullCount=4!
#或是
kernel: [47203.620633] no file read method
kernel: [47203.620657] Read file “/etc/Wireless/RT2870AP/RT2870AP.dat” failed(errCode=-1)!
kernel: [47203.620670] 1. Phy Mode = 6
kernel: [47203.620678] 2. Phy Mode = 6
kernel: [47203.620687] NVM is Efuse and its size =1d[1e0-1fc]
kernel: [47203.630202] ERROR!!! MT7601 E2PROM: WRONG VERSION 0xd, should be 12
kernel: [47203.645531] 3. Phy Mode = 6
kernel: [47203.645545] AntCfgInit: primary/secondary ant 0/1
kernel: [47203.849695] RTMPSetPhyMode: channel is out of range, use first channel=0
```
第一种错误的我没验证过的方法是[这个](http://blog.csdn.net/bbandxq521/article/details/5997419 "这个")

第二种错误就是没有成功读取配置文件，这时候驱动就使用默认的配置如ssid为HT_APx，相关源码如下
```c
//ap.c Line 164
for (apidx=0; apidx<pAd->ApCfg.BssidNum; apidx++)
    {
        MULTISSID_STRUCT *pMbss = &pAd->ApCfg.MBSSID[apidx];

if ((pMbss->SsidLen <= 0) || (pMbss->SsidLen > MAX_LEN_OF_SSID))
        {
            NdisMoveMemory(pMbss->Ssid, "HT_AP", 5);
            pMbss->Ssid[5] = '0'+apidx;
            pMbss->SsidLen = 6;
        }
//.......................................
```
哦那就看看怎么让它读配置。Read file failed的错误来自于这
```c
//rt_profile.c Line 181
    if (src && *src)
    {
        RtmpOSFSInfoChange(&osFSInfo, TRUE);
        srcf = RtmpOSFileOpen(src, O_RDONLY, 0);
        if (IS_FILE_OPEN_ERR(srcf)) 
        {
            DBGPRINT(RT_DEBUG_ERROR, ("Open file \"%s\" failed!\n", src));
        }
        else 
        {
            retval =RtmpOSFileRead(srcf, buffer, MAX_INI_BUFFER_SIZE);
            if (retval > 0)
            {
                RTMPSetProfileParameters(pAd, buffer);
                retval = NDIS_STATUS_SUCCESS;
            }
            else
                DBGPRINT(RT_DEBUG_ERROR, ("Read file \"%s\" failed(errCode=%d)!\n", src, retval));

retval = RtmpOSFileClose(srcf);
            if ( retval != 0)
            {
                retval = NDIS_STATUS_FAILURE;
                DBGPRINT(RT_DEBUG_ERROR, ("Close file \"%s\" failed(errCode=%d)!\n", src, retval));
            }
        }
        
        RtmpOSFSInfoChange(&osFSInfo, FALSE);
    }

#ifdef HOSTAPD_SUPPORT
        for (i = 0; i < pAd->ApCfg.BssidNum; i++)
        {
            pAd->ApCfg.MBSSID[i].Hostapd=FALSE;
            DBGPRINT(RT_DEBUG_TRACE, ("Reset ra%d hostapd support=FLASE", i));
            
        }
#endif /*HOSTAPD_SUPPORT */
```
那就是RtmpOSFileRead()没有读取到文件，这个函数在/src/os/linux/rt_linux.c里
```c
//rt_linux.c Line 1162
int RtmpOSFileRead(RTMP_OS_FD osfd, char *pDataPtr, int readLen)
{
    /* The object must have a read method */
    if (osfd->f_op && osfd->f_op->read) {
        return osfd->f_op->read(osfd, pDataPtr, readLen, &osfd->f_pos);
    } else {
        DBGPRINT(RT_DEBUG_ERROR, ("no file read method\n"));
        return -1;
    }
}
```
也正是这里报的no file read method错误。检查 osfd->f_op 和 osfd->f_op->read 发现后者为空，即没有read函数来读取文件。

在[这里](http://lkml.iu.edu/hypermail/linux/kernel/1506.3/02378.html "这里")和[这里](http://stackoverflow.com/questions/33183923/ "这里")看到用`ssize_t vfs_read(struct file* filp, char __user* buffer, size_t len, loff_t* pos);`替换`ssize_t read()`：
```c
int RtmpOSFileRead(RTMP_OS_FD osfd, char *pDataPtr, int readLen)
{
    DBGPRINT(RT_DEBUG_ERROR, ("add: %p %p\n", osfd->f_op, osfd->f_op->read));
        /* The object must have a read method */
        if (osfd->f_op /*&& osfd->f_op->read*/) {
                //return osfd->f_op->read(osfd, pDataPtr, readLen, &osfd->f_pos);
                return vfs_read(osfd, pDataPtr, readLen, &osfd->f_pos);
        } else {
                DBGPRINT(RT_DEBUG_ERROR, ("no file read method\n"));
                return -1;
        }
}
```
重新编译和加载后
```sh
pi@raspberrypi:~/Downloads/mi/mt7601u $ iwconfig
ppp0      no wireless extensions.

ra0       RTWIFI SoftAP  ESSID:"FREE-WIFI"
          Mode:Managed  Channel=11  Access Point: C8:3A:35:CC:ED:B2
          Bit Rate=150 Mb/s

lo        no wireless extensions.

eth0      no wireless extensions.
```
[![](http://lo-li.net/wp-content/uploads/2016/03/1361093046-169x300.jpg)](http://lo-li.net/wp-content/uploads/2016/03/1361093046-169x300.jpg)

标签 RPi 下的文章

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