查看“LTT-MX8M-EVM100 开发板 linux 4.14.98使用手册”的源代码

===阅读指导===

蓝色字体为调试终端的信息，其中 “ # ” 或“ > ”开头的为用户输入的指令。
<pre style="color: #3e45a9">
# cd ~/work
> boot
</pre>

===SD卡测试===
系统启动后将SD卡插入到Micro SD卡槽【J26】中，系统会自动将其挂载到/run/media目录下，在插入SD卡的同时，在系统终端会打印出SD卡相关信息：
<pre style="color: #3e45a9">
[  418.785224] mmc1: host does not support reading read-only switch, assuming write-enable
[  418.931992] mmc1: new ultra high speed SDR104 SDHC card at address 0007
[  418.940000] mmcblk1: mmc1:0007 SD32G 29.0 GiB 
[  418.947404]  mmcblk1: p1
[  419.146762] FAT-fs (mmcblk1p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
</pre>
可通过df命令查看SD卡挂载位置:
<pre style="color: #3e45a9">
# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       2.3G  1.9G  235M  89% /
devtmpfs        237M  4.0K  237M   1% /dev
tmpfs           494M     0  494M   0% /dev/shm
tmpfs           494M  8.5M  485M   2% /run
tmpfs           494M     0  494M   0% /sys/fs/cgroup
tmpfs           494M     0  494M   0% /tmp
tmpfs           494M  156K  493M   1% /var/volatile
/dev/mmcblk0p1   64M   41M   24M  64% /run/media/mmcblk0p1
tmpfs            99M     0   99M   0% /run/user/0
/dev/mmcblk1p1   29G  2.3G   27G   8% /run/media/mmcblk1p1
</pre>
可通过如下命令查看、读写当前SD卡的内容：
<pre style="color: #3e45a9">
# ls /run/media/mmcblk2p1/     #查看SD卡的内容
# cd /run/media/mmcblk2p1/     #进入SD卡目录
# touch test                   #创建test文件
# rm test                      #删除test文件
</pre>
<br/>

===USB HOST 测试===
以U盘为例，将U盘插入USB HOST接口【J20、J21、J22、J23】其中任意一个，系统会默认将U盘挂载在/run/media目录下，并打印如下消息：
<pre style="color: #3e45a9">
[  766.582245] usb 1-1.4: new high-speed USB device number 7 using xhci-hcd
[  766.700039] usb-storage 1-1.4:1.0: USB Mass Storage device detected
[  766.711958] scsi host0: usb-storage 1-1.4:1.0
[  767.744766] scsi 0:0:0:0: Direct-Access     Generic  Flash Disk       8.07 PQ: 0 ANSI: 4
[  767.755868] sd 0:0:0:0: [sda] 15728640 512-byte logical blocks: (8.05 GB/7.50 GiB)
[  767.764424] sd 0:0:0:0: [sda] Write Protect is off
[  767.770329] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[  767.785294]  sda: sda1
[  767.791353] sd 0:0:0:0: [sda] Attached SCSI removable disk
[  768.254786] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
</pre>
可通过df命令查看U盘挂载位置：
<pre style="color: #3e45a9">
# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       2.3G  1.9G  235M  89% /
devtmpfs        237M  4.0K  237M   1% /dev
tmpfs           494M     0  494M   0% /dev/shm
tmpfs           494M  8.5M  485M   2% /run
tmpfs           494M     0  494M   0% /sys/fs/cgroup
tmpfs           494M     0  494M   0% /tmp
tmpfs           494M  168K  493M   1% /var/volatile
/dev/mmcblk0p1   64M   41M   24M  64% /run/media/mmcblk0p1
tmpfs            99M     0   99M   0% /run/user/0
/dev/sda1       7.5G  1.7G  5.9G  22% /run/media/sda1
</pre>
通过如下命令查看、读写U盘内容：
<pre style="color: #3e45a9">
 # ls /run/media/sda1/        #查看U盘的内容
 # cd /run/media/sda1/        #进入U盘目录
 # touch test                 #创建test文件
 # rm test                    #删除test文件
</pre>

===以太网测试===
使用网线将开发板的网口【P3】与PC机的网口连接，设置PC机的IP地址为192.168.1.115，子网掩码为：255.255.255.0

配置开发板的网络，如下：
<pre style="color: #3e45a9">
# ifconfig eth0 192.168.1.200 netmask 255.255.255.0     #配置开发板IP地址与PC机在同一网段
# ping 192.168.1.115                                    #通过ping命令进行本地网络测试
</pre>

如需连接外网，需根据路由器网关进行配置，如下：
<pre style="color: #3e45a9">
# route add default gw 192.168.1.1       #设置默认路由网关
# ping www.baidu.com                     #通过ping命令进行互联网测试
</pre>	

<br/>

===串口测试===
===录音/播放测试===
测试前将耳机与MIC分别插入对应的连接器。 

'''录音测试'''
<pre style="color: #3e45a9">
 # arecord -Dhw:0,0 -d 10 -f cd -r 44100 -c 2 -t wav test.wav
</pre>
'''播放测试'''
<pre style="color: #3e45a9">
 # aplay test.wav
</pre>
注意：aplay不能播放MP3

</br>

===多媒体播放测试===
使用gplay-1.0播放器进行测试，gplay-1.0使用说明：

:h 显示操作帮助
:p 播放命令
:s 停止命令
:a 暂停/继续命令
:v 音量设置
:m 静音或去除静音
:>下一个视频文件
:<上一个视频文件
:r 重复播放或单次播放
:t 旋转视频播放
:i 多媒体文件信息。


'''测试方法'''
<pre style="color: #3e45a9">
# gplay-1.0  /unit_tests/test.mp4                #MP4播放
# gplay-1.0 /unit_tests/test.mp3                 #MP3播放
</pre>
<br/>

===时钟测试===
通过向RTC写/读时间，以及断电，重启后查看系统时间同步情况来验证RTC功能

开发板【J16】安装装纽扣电池<br/>
*查看系统时间：
<pre style="color: #3e45a9">
 # date
 Mon Aug 12 05:18:57 UTC 2019                   #当前系统时间
</pre>
*查看硬件时间：
<pre style="color: #3e45a9">
 # hwclock 
 Mon Aug 3 06:28:06 2019  0.000000 seconds      #当前硬件时间
</pre>
*设置系统时间：
<pre style="color: #3e45a9">
 # date -s "2019-10-10 09:51:50"
 Thu Oct 10 09:51:50 UTC 2019                   #设置系统时间
</pre>
*将系统时间写入硬件时间：
<pre style="color: #3e45a9">
 # hwclock -w                                   #同步硬件时间
</pre>
断电重启后，查看系统时间和硬件时间，时间同步说明设置成功。

<br/>
===4G测试===
开发板适配EC20模块，连接到USB HOST接口，出现如下打印信息，表示设备被识别
<pre style="color: #3e45a9">
[  417.527881] usb 1-1.3: new high-speed USB device number 7 using xhci-hcd
[  417.658627] option 1-1.3:1.0: GSM modem (1-port) converter detected
[  417.665572] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
[  417.673175] option 1-1.3:1.1: GSM modem (1-port) converter detected
[  417.683067] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
[  417.690636] option 1-1.3:1.2: GSM modem (1-port) converter detected
[  417.700455] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
[  417.707938] option 1-1.3:1.3: GSM modem (1-port) converter detected
[  417.717527] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
</pre>
*拨号上网
<pre style="color: #3e45a9">
  # pppd call quectel-ppp
</pre>
串口输出如下信息：
<pre style="color: #3e45a9">
 pppd options in effect:
debug           # (from /etc/ppp/peers/quectel-ppp)
persist         # (from /etc/ppp/peers/quectel-ppp)
maxfail 0               # (from /etc/ppp/peers/quectel-ppp)
dump            # (from /etc/ppp/peers/quectel-ppp)
noauth          # (from /etc/ppp/peers/quectel-ppp)
user card               # (from /etc/ppp/peers/quectel-ppp)
password ??????         # (from /etc/ppp/peers/quectel-ppp)
remotename 3gppp                # (from /etc/ppp/peers/quectel-ppp)
/dev/ttyUSB3            # (from /etc/ppp/peers/quectel-ppp)
115200          # (from /etc/ppp/peers/quectel-ppp)
lock            # (from /etc/ppp/peers/quectel-ppp)
connect chat -s -v -f /etc/ppp/peers/quectel-chat-connect               # (from /etc/ppp/peers/quectel-ppp)
disconnect chat -s -v -f /etc/ppp/peers/quectel-chat-disconnect         # (from /etc/ppp/peers/quectel-ppp)
nocrtscts               # (from /etc/ppp/peers/quectel-ppp)
local           # (from /etc/ppp/peers/quectel-ppp)
lcp-echo-failure 12             # (from /etc/ppp/peers/quectel-ppp)
lcp-echo-interval 5             # (from /etc/ppp/peers/quectel-ppp)
hide-password           # (from /etc/ppp/peers/quectel-ppp)
ipcp-accept-local               # (from /etc/ppp/peers/quectel-ppp)
ipcp-accept-remote              # (from /etc/ppp/peers/quectel-ppp)
ipparam 3gppp           # (from /etc/ppp/peers/quectel-ppp)
noipdefault             # (from /etc/ppp/peers/quectel-ppp)
ipcp-max-failure 10             # (from /etc/ppp/peers/quectel-ppp)
defaultroute            # (from /etc/ppp/peers/quectel-ppp)
usepeerdns              # (from /etc/ppp/peers/quectel-ppp)
noccp           # (from /etc/ppp/peers/quectel-ppp)
</pre>
*使用ifconfig -a指令查看是否有ppp0设备，如果有说明拨号成功
<pre style="color: #3e45a9">
 # ifconfig -a
</pre>
<pre style="color: #3e45a9">
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.250.22.175  P-t-P:10.64.64.64  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:374 (374.0 B)  TX bytes:700 (700.0 B
</pre>
*使用Ping指令测试网络
 # ping www.baidu.com

===M.2接口测试===
===BT测试===
开发板提供⼀个WiFi/BT模块Fn-link6222b，wifi型号为QCA6714，蓝牙是串口模块，与
ttymxc2相连，本章用开发板蓝牙连接PC端蓝牙来测试蓝牙功能

测试前连接天线到U5，以免信号弱导致无法连接
*绑定串口
:使用hciattch命令 来绑定ttymxc2串口，命令如下
 rtk_hciattach -n -s 115200 ttymxc2 rtk_h5 &
*打开wlan
:可以用rfkill unblock 0 或者rfkill unblock wlan。 测试时，请先关闭wlan，再打开
<pre style="color: #3e45a9">
# rfkill list
0: hci0: bluetooth
        Soft blocked: yes
        Hard blocked: no

# rfkill unblock 0
# rfkill list     
0: hci0: bluetooth
        Soft blocked: no
        Hard blocked: no
</pre>
*连接蓝牙
:使用bluetoothctl工具来控制蓝牙进行扫描和连接。
{| class="wikitable"
|-
! 功能 || 指令
|-
| 扫描 || scan on
|-
| 查看扫描设备|| devices
|-
| 配对 || pair
|-
| 连接 || connect
|-
|}
<pre style="color: #3e45a9">
# bluetoothctl
Agent registered
[bluetooth]# scan on
Discovery started
[CHG] Controller 0C:9A:42:5D:43:23 Discovering: yes
[NEW] Device 38:E6:0A:58:25:BD  LTT
[NEW] Device 30:AE:A4:2B:99:C1 30-AE-A4-2B-99-C1
[NEW] Device 5B:6E:C4:1F:52:45 VISG20000008636
[NEW] Device 55:19:AD:39:69:2F 55-19-AD-39-69-2F
[NEW] Device 88:2D:53:94:68:A1 xiaodu-A2-1171
[bluetooth]# devices 
Device 43:84:80:8E:20:FC 43-84-80-8E-20-FC
Device 30:AE:A4:2B:99:C1 30-AE-A4-2B-99-C1
Device 5B:6E:C4:1F:52:45 VISG20000008636
Device 55:19:AD:39:69:2F 55-19-AD-39-69-2F
Device 38:E6:0A:58:25:BD  LTT
[bluetooth]# pair 38:E6:0A:58:25:BD 
Attempting to pair with 38:E6:0A:58:25:BD
[CHG] Device 38:E6:0A:58:25:BD Connected: yes
Request confirmation
[agent] Confirm passkey 776119 (yes/no): yes
[ LTT]# 
</pre>
*输入quit退出bluetoothctl工具

===WIFI测试===
===MIPI-CSI测试===
===MIPI-DSI测试===
===HDMI测试===