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XR806不仅硬件功能多，XR806也提供了功能极其丰富的SDK，几天体验下来非常容易上手。常见的功能几乎都有相应的cmd或demo实现，HAL也做得非常全面，非常适合快速开发。这一点超级好评！本文章要实现的无线OTA也基于该SDK。

环境搭建

本实验主机环境为ubuntu，并基于freertos sdk开发，这里不详述，全志在线以及其他文章有很多介绍了。 https://xr806.docs.aw-ol.com/

无线OTA简述

OTA全称空中下载技术，及通过网络在线更新软件。当产品发布以后，若能支持网络升级，那将省去不少人力。所以OTA对于物联网产品是十分重要的功能。XR806 SDK中提供了两种升级方式：通过文件系统升级；通过http网络升级。同时也提供了完整的分区备份/校验/加密等功能，使得升级功能不容易被入侵。

无线OTA实验步骤

hello_demo工程位于project/demo/hello_demo。该工程虽然只在main.c中打印了"hello world"，看似功能简单。但它其实还支持许多cmd，位于project/demo/hello_demo/command.c：

static const struct cmd_data g_main_cmds[] = {#if PRJCONF_NET_EN{ "net",     cmd_net_exec, CMD_DESC("network command") },#endif{ "mem",     cmd_mem_exec, CMD_DESC("memory command") },{ "heap",    cmd_heap_exec, CMD_DESC("heap use information command") },{ "thread",  cmd_thread_exec, CMD_DESC("thread information command") },{ "upgrade", cmd_upgrade_exec, CMD_DESC("upgrade command") },{ "reboot",  cmd_reboot_exec, CMD_DESC("reboot command") },#ifdef CONFIG_OTA{ "ota",     cmd_ota_exec, CMD_DESC("over the airtechnology upgrade commands") },#endif{ "pm",      cmd_pm_exec, CMD_DESC("power management command") },{ "efpg",    cmd_efpg_exec, CMD_DESC("efpg command") },{ "help",    cmd_main_help_exec, CMD_DESC(CMD_HELP_DESC) },};

我们需要在menuconfig中使能OTA和NET（默认已经全部支持）。所以hello_demo工程默认是支持http网络以及OTA功能，基础条件都具备，接下来看看该如何使用。

1. 使用phoenixMC工具编译烧录hello工程

sudo ./phoenixMC -i ../out/xr_system.img

烧录完成：  打开串口查看日志：  

sudo minicom -D /dev/ttyUSB0 -b 115200

2. 修改hello工程，编译生成即将要升级的固件

修改hello.c，将打印修改为“OTA OK!”

 int main(void){platform_init();while (1) {OS_Sleep(10);printf("OTA OK! @ %u sec\n", OS_GetTicks());  //修改打印}return 0;}

重新编译

yhz@lab:~/work/misc/xr806_sdk$ make buildyhz@lab:~/work/misc/xr806_sdk$ md5sum out/xr_system.img6e79ddbdad10928c16a50805c2ca0f1c  out/xr_system.img

3. 使用net cmd命令连接wifi

 Set STA mode：  $ net mode sta<ACK> 200 OK[net INF] no need to switch wlan mode 0Enable STA：  $ net sta enable<ACK> 200 OKConfig SAT：  $ net sta config dmesg-4g 88880000    //wifi名称和密码<ACK> 200 OKConnect wifi：  $ net sta connect<ACK> 200 OKen1: Trying to associate with 34:ca:81:89:da:fc (SSID='dmesg-4g' freq=2462 MHz)en1: WPA: Key negotiation completed with 34:ca:81:89:da:fc [PTK=CCMP GTK=CCMP]en1: CTRL-EVENT-CONNECTED - Connection to 34:ca:81:89:da:fc completed [id=0 id_str=][net INF] msg <wlan connected>[net INF] netif is link up[net INF] start DHCP...WAR drop=1135, fctl=0x00d0.[net INF] netif (IPv4) is up[net INF] address: 192.168.10.5[net INF] gateway: 192.168.10.1[net INF] netmask: 255.255.255.0[net INF] msg <network up>Check：  $ net ifconfig status<ACK> 200 en1 up, address:192.168.10.5 gateway:192.168.10.1 netmask:255.255.255.0$ net ping 192.168.10.11<ACK> 200 OKPING 192.168.10.11 108 bytes of data.100 bytes from 192.168.10.11: icmp_seq=1    time=9 ms100 bytes from 192.168.10.11: icmp_seq=2    time=6 ms100 bytes from 192.168.10.11: icmp_seq=3    time=14 ms--- 192.168.10.11 ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 3029msrtt min/avg/max/mdev = 6/9/14/8 ms

至此，wifi配置完成，xr806已成功联网。接下来配置镜像服务器。  

4. 使用apache2搭建http服务器

 sudo apt-get updatesudo apt install apache2sudo ufw app listsudo ufw allow 'Apache'sudo systemctl status apache2

整个搭建过程很简单。apache2的默认文件位置位于/var/www/html/目录下。
给该文件夹增加权限：

sudo chmod 777 -R /var/www/html/

这样服务器环境就搭建好了，将待OTA的镜像放到/var/www/html/目录下：

  yhz@lab:~/work/misc/xr806_sdk$ cp out/xr_system.img /var/www/html/yhz@lab:~/work/misc/xr806_sdk$yhz@lab:~/work/misc/xr806_sdk$ md5sum /var/www/html/xr_system.img6e79ddbdad10928c16a50805c2ca0f1c  /var/www/html/xr_system.img

5. 开始OTA

在第三步中我们已经连接了wifi，此时xr806可以从服务器获取新的镜像。使用ota命令开始升级：

 $ ota http http://192.168.10.11/xr_system.img<ACK> 200 OKOTA: erase flash...OTA: start loading image...Hello world! @ 41063083 secOTA: loading image (50 KB)...OTA: loading image (101 KB)...OTA: loading image (150 KB)...OTA: loading image (200 KB)...OTA: loading image (251 KB)...OTA: loading image (300 KB)...OTA: loading image (350 KB)...OTA: loading image (401 KB)...OTA: loading image (450 KB)...OTA: loading image (500 KB)...OTA: loading image (551 KB)...OTA: loading image (600 KB)...OTA: loading image (651 KB)...OTA: loading image (701 KB)...OTA: loading image (750 KB)...OTA: loading image (801 KB)...OTA: loading image (850 KB)...OTA: loading image (901 KB)...OTA: loading image (951 KB)...OTA: loading image (1000 KB)...OTA: finish loading image(0x000fab60)OTA: finish checkinuse default flash chip mJedec 0x0[FD I]: mode: 0x10, freq: 96000000Hz, drv: 0[FD I]: jedec: 0x0, suspend_support: 1mode select:ewlan information===================================================firmware:version : R0-XR_C07.08.52.67_ULP_R_02.132 Jan 10 2023 19:14:11-Y02.132buffer  : 8driver:version : XR_V02.06.10mac address:in use        : 0c:69:88:39:e6:01in use        : 0c:69:88:39:e6:02====================================================================wlan mode:aplatform information===============================================XR806 SDK v1.2.2  Oct 24 2023 00:13:09 62800400heap space [0x216014, 0x24bc00), size 220140cpu  clock 160000000 HzHF   clock  40000000 Hzsdk option:XIP           : enableINT LF OSC    : enableINT LDO       : selectINT LDO / EXT PWR: enableSIP flash     : enablemac address:efuse         : 80:74:84:05:b2:56in use        : 0c:69:88:39:e6:01====================================================================$$ OTA OK! @ 10165 sec$ OTA OK! @ 20165 sec

至此，OTA升级完毕。

感慨一下，xr806的硬件和SDK功能很强大，开发起来真的很快~~~!