一、简介

本demo基于OpenHarmony3.1Beta版本开发，该样例能够接入数字管家应用，通过数字管家应用监测体重秤上报数据，获得当前测量到的体重，身高，并在应用端形成一段时间内记录的体重值，以折线图的形式表现出来，根据计算的BMI值来提醒当前身体健康状态，推送健康小知识。

1.交互流程

交互图

如上图所示，智能体重称整体方案原理图可以大致分成：智能体重称设备、数字管家应用、云平台三部分。智能体重称通过MQTT协议连接华为IOT物联网平台，从而实现命令的接收和属性上报。 关于智能设备接入华为云IoT平台的详细细节可以参考 连接IOT云平台指南；智能设备同数字管家应用之间的设备模型定义可以参考profile .

2.实物简介

如上图示，左边为全志xr806模组，右边为超声波测距模块，echo脚连接PA19，Triq脚连接PA20,Vcc脚连接5V电源，Gnd脚接地，

如上图示，右边为称重模块，clk脚接PB15，dt脚接PB14，vcc脚接5V，gnd脚接地，称重传感器红色线接E+，黑色线接E-，白色线接A-，绿色线接A+

左边xr806模块左下角k1按键，长按k1按键不放，同时上电，4-5秒后松开按键，可以清除已保存得配网信息

xr806模块，在设备正常工作后，按k1按键，可以初始化当前得重量为0，高度为0

二、 快速上手

1.硬件准备

• 全志xr806模组
• hcsr04超声波模块
• hx711称重模块带支架托盘
• 预装HarmonyOS手机一台

2、环境准备
参照文档: XR806快速上手指导文档

3、编译前准备

设备侧代码下载
具体仓库地址：https://gitee.com/openharmony-sig/knowledge_demo_smart_home/

下载方式：使用git 命令下载，指令如下（用户也可以根据需要将该仓库fork到自己的目录下后进行下载）

cd ~ git clone git@gitee.com:openharmony-sig/knowledge_demo_smart_home.git 

代码拷贝

cp -rfa ~/knowledge_demo_smart_home/dev/team_x ~/openharmony/vendor/ cp -rfa ~/knowledge_demo_smart_home/dev/third_party/iot_link ~/openharmony/third_party/ 

SOC代码下载替换
当前官方soc代码由于DHCP暂未适配，所以暂时不支持AP模式，这时需要下载并替换之前SOC代码。如果官方soc代码已修复该问题，可忽略此步骤。

git clone https://gitee.com/moldy-potato-chips/xr806_-ap_mode.git mv ~/openharmony/device/soc/allwinner ~/allwinner.org // 不建议直接删除， cp -raf xr806_-ap_mode ~/openharmony/device/soc/allwinner 

整合并修改完成后的目录结构如下图

修改文件

• 修改编译依赖
  打开 device/soc/allwinner/xradio/xr806/BUILD.gn，添加应用依赖(deps字段):

module_group(module_name) { modules = [ "src", "project", "include", ] configs = [ ":SdkLdCconfig", ] deps = [ "//vendor/team_x/smart_weight_scale/demo_smart_weight_scale:smart_weight_scale" ] } 

• 修改编译方式
  将demo依赖的库编译方式(static_library)修改为(source_set):
  具体依赖查看demo_smart_weight_scale目录下的BUILD.gn:

deps = [ "../../common/iot_wifi_xradio:iot_wifi", "../../common/iot_cloud:iot_cloud", "//third_party/cJSON:cjson", "../../common/iot_boardbutton_xradio:iot_boardbutton", "../../common/iot_boardled_xradio:iot_boardled_xradio", ] 

其中//third_party/cJSON目录下的BUILD.gn建议参照下面的修改:

source_set("cJSON") { sources = [ "cJSON.c", "cJSON_Utils.c", ] ldflags = [ "-lm" ] } 

third_party/iot_link目录下的各级使用到的BUILD.gn也需要将编译方式修改为source_set，或者将所有需要编译的文件放在iot_link目录的BUILD.gn中，如下：

source_set("iot_link") { sources = [ "link_log/link_log.c", "link_misc/link_random.c", "link_misc/link_ring_buffer.c", "link_misc/link_string.c", "network/dtls/dtls_al/dtls_al.c", "network/dtls/mbedtls/mbedtls_port/dtls_interface.c", "network/dtls/mbedtls/mbedtls_port/mbed_port.c", "network/dtls/mbedtls/mbedtls_port/timing_alt.c", "network/mqtt/mqtt_al/mqtt_al.c", "network/mqtt/paho_mqtt/port/paho_mqtt_port.c", "network/mqtt/paho_mqtt/port/paho_osdepends.c", "network/mqtt/paho_mqtt/paho/MQTTClient-C/src/MQTTClient.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTConnectClient.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTConnectServer.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTDeserializePublish.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTFormat.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTPacket.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTSerializePublish.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTSubscribeClient.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTSubscribeServer.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTUnsubscribeClient.c", "network/mqtt/paho_mqtt/paho/MQTTPacket/src/MQTTUnsubscribeServer.c", "oc_mqtt/oc_mqtt_al/oc_mqtt_al.c", "oc_mqtt/oc_mqtt_profile_v5/oc_mqtt_profile.c", "oc_mqtt/oc_mqtt_profile_v5/oc_mqtt_profile_package.c", "oc_mqtt/oc_mqtt_profile_v5/oc_mqtt_event.c", "oc_mqtt/oc_mqtt_tiny_v5/oc_mqtt_tiny.c", "oc_mqtt/oc_mqtt_tiny_v5/hmac.c", "queue/queue.c", ] cflags = [ "-Wno-unused-variable" ] cflags += [ "-Wno-unused-but-set-variable" ] cflags += [ "-Wno-sign-compare" ] cflags += [ "-Wno-unused-parameter" ] cflags += [ "-Wno-unused-function" ] ldflags = [ "-Wl,-rpath-link=//device/xradio/xr806/xr_skylark/lib" ] ldflags += [ "-lmbedtls" ] include_dirs = [ "inc", "link_log", "link_misc", "queue", "oc_mqtt/oc_mqtt_tiny_v5", "oc_mqtt/oc_mqtt_profile_v5", "oc_mqtt/oc_mqtt_al", "network/dtls/mbedtls/mbedtls_port", "network/mqtt/paho_mqtt/port", "network/mqtt/paho_mqtt/paho/MQTTClient-C/src", "network/mqtt/paho_mqtt/paho/MQTTPacket/src", "//third_party/mbedtls/include/", "//third_party/mbedtls/include/", "//third_party/cJSON", "//kernel/liteos_m/components/cmsis/2.0", "//device/xradio/xr806/xr_skylark/include/net/mbedtls-2.2.0/", ] defines = [ "MQTTCLIENT_PLATFORM_HEADER=paho_osdepends.h", "WITH_DTLS", "MBEDTLS_AES_ROM_TABLES", "MBEDTLS_CONFIG_FILE=\"los_mbedtls_config_dtls.h\"", "CONFIG_DTLS_MBEDTLS_CERT", "CONFIG_DTLS_MBEDTLS_PSK", "CFG_MBEDTLS_MODE=PSK_CERT", "CONFIG_OC_MQTT_TINY_ENABLE=1" ] } 

• 修改iot_link中的部分文件
  1.third_party/iot_link/network/mqtt/paho_mqtt/port/paho_mqtt_port.c

测试发现，当fd为0的时候，在执行recv时会立马返回-1，因此做下面规避操作。

static int __socket_connect(Network *n, const char *host, int port) { ... int tmpfd = socket(AF_INET,SOCK_STREAM,0); // to skip fd = 0; fd = socket(AF_INET,SOCK_STREAM,0); if(fd == -1) { return ret; } close(tmpfd); // to skip fd = 0; ... } 

系统setsockopt函数未适配，因此需要做下面的修改：

static int __socket_read(void *ctx, unsigned char *buf, int len, int timeout) { int fd; int ret = 0; #if 0 struct timeval timedelay = {timeout / 1000, (timeout % 1000) * 1000}; if(NULL== uf) { return ret; } fd = (int)(intptr_t)ctx; ///< socket could be zero if (timedelay.tv_sec < 0 || (timedelay.tv_sec == 0 && timedelay.tv_usec <= 0)) { timedelay.tv_sec = 0; timedelay.tv_usec = 100; } if(0 != setsockopt(fd,SOL_SOCKET,SO_RCVTIMEO,&timedelay,sizeof(struct timeval))) { return ret; //could not support the rcv timeout } int bytes = 0; while (bytes < len) { int rc = recv(fd, &buf[bytes], (size_t)(len - bytes), 0); printf("[%s|%s|%d]fd = %d, rc = %d\n", __FILE__,__func__,__LINE__, fd, rc); if (rc == -1) { if (errno != EAGAIN && errno != EWOULDBLOCK) { bytes = -1; } break; } else if (rc == 0) { bytes = 0; break; } else { bytes += rc; } } return bytes; #else int bytes = 0; fd_set fdset; struct timeval timedelay = {timeout / 1000, (timeout % 1000) * 1000}; if(NULL== buf) { return ret; } fd = (int)(intptr_t)ctx; ///< socket could be zero if (timedelay.tv_sec < 0 || (timedelay.tv_sec == 0 && timedelay.tv_usec <= 0)) { timedelay.tv_sec = 0; timedelay.tv_usec = 100; } timedelay.tv_sec = 2; FD_ZERO(&fdset); FD_SET(fd, &fdset); ret = select(fd + 1, &fdset, NULL, NULL, &timedelay); if (ret > 0) { while (bytes < len) { int rc = recv(fd, &buf[bytes], (size_t)(len - bytes), 0); // printf("[%s|%s|%d]fd = %d, rc = %d, errno=%d(%s)\n", __FILE__,__func__,__LINE__, fd, rc,errno, strerror(errno)); if (rc == -1) { if (errno != EAGAIN && errno != EWOULDBLOCK) { bytes = -1; } break; } else if (rc == 0) { bytes = 0; break; } else { bytes += rc; } } } return bytes; #endif } 

2.third_party/iot_link/network/dtls/mbedtls/mbedtls_port/dtls_interface.c

在文件顶部添加打印函数定义以及添加mbedtls_calloc以及mbedtls_free的定义，否则编译会提示错误：

#define MBEDTLS_LOG LINK_LOG_DEBUG #ifndef mbedtls_calloc #define mbedtls_calloc calloc #endif #ifndef mbedtls_free #define mbedtls_free free #endif 

系统部分mbedtls接口不一致，固需要注释部分接口代码：

mbedtls_ssl_context dtls_ssl_new(dtls_establish_info_s *info, char plat_type) { ... if (info->psk_or_cert == VERIFY_WITH_PSK) { /* if ((ret = mbedtls_ssl_conf_psk(conf, info->v.p.psk, info->v.p.psk_len, info->v.p.psk_identity, strlen((const char *)info->v.p.psk_identity))) != 0) { MBEDTLS_LOG("mbedtls_ssl_conf_psk failed: -0x%x", -ret); goto exit_fail; } */ } ... } int dtls_shakehand(mbedtls_ssl_context *ssl, const dtls_shakehand_info_s *info) { ... if (MBEDTLS_SSL_IS_CLIENT == info->client_or_server) { ret = mbedtls_net_connect(server_fd, info->u.c.host, info->u.c.port, info->udp_or_tcp); if( 0 != ret) { ret = MBEDTLS_ERR_NET_CONNECT_FAILED; goto exit_fail; } } else { //server_fd = (mbedtls_net_context*)atiny_net_bind(NULL, info->u.s.local_port, MBEDTLS_NET_PROTO_UDP); ///< --TODO ,not implement yet } ... } void dtls_init(void) { (void)mbedtls_platform_set_calloc_free(calloc, free); (void)mbedtls_platform_set_snprintf(snprintf); // (void)mbedtls_platform_set_printf(printf); } 

在iot_link/network/dtls/mbedtls/mbedtls_port/mbed_port.c文件中的dtls_imp_init()函数中，也需要注释掉未实现的接口，否则编译报错：

int dtls_imp_init(void) { int ret =-1; // (void)mbedtls_platform_set_calloc_free(calloc, free);  // (void)mbedtls_platform_set_snprintf(snprintf); // (void)mbedtls_platform_set_printf(printf); ret = dtls_al_install(&s_mbedtls_io); return ret; } 

3.在文件iot_link/network/mqtt/paho_mqtt/port/paho_osdepends.c中添加对应timersub和timeradd的实现(系统中未实现该函数)：

// add this for "timersub" && "timeradd" #ifndef timersub #define timersub(s,t,a) (void) ( (a)->tv_sec = (s)->tv_sec - (t)->tv_sec, \ ((a)->tv_usec = (s)->tv_usec - (t)->tv_usec) < 0 && \ ((a)->tv_usec += 1000000, (a)->tv_sec--) ) #endif #ifndef timeradd #define timeradd(s,t,a) (void) ( (a)->tv_sec = (s)->tv_sec + (t)->tv_sec, \ ((a)->tv_usec = (s)->tv_usec + (t)->tv_usec) >= 1000000 && \ ((a)->tv_usec -= 1000000, (a)->tv_sec++) ) #endif 

4.编译中会有部分头文件提示找不到，这个时候直接将其注释即可

(iot_link/network/mqtt/paho_mqtt/port/paho_osdepends.h): #define INVALID_SOCKET SOCKET_ERROR // #include <sys/socket.h> #include <sys/param.h> #include <sys/time.h> // #include <netinet/in.h> // #include <netinet/tcp.h> // #include <arpa/inet.h> // #include <netdb.h> #include <stdio.h> #include <unistd.h> #include <errno.h> #include <fcntl.h> #include <string.h> #include <stdlib.h> #endif #if defined(WIN32) #include <Iphlpapi.h> #else // #include <sys/ioctl.h> // #include <net/if.h> #endif 

5.因为弱引用导致无法链接相关符号，因此需要注释以下几个文件中的弱引用。

文件一 third_party/iot_link/network/dtls/dtls_al/dtls_al.c #if 0 __attribute__((weak)) int dtls_imp_init(void) { LINK_LOG_DEBUG("%s:###please implement dtls by yourself####",__FUNCTION__); return -1; } #endif extern int dtls_imp_init(void); 文件二 third_party/iot_link/network/mqtt/mqtt_al/mqtt_al.c #if 0 __attribute__((weak)) int mqtt_imp_init(void) { LINK_LOG_DEBUG("%s:###please implement mqtt by yourself####",__FUNCTION__); return -1; } #endif extern int mqtt_imp_init(void); 文件三 third_party/iot_link/oc_mqtt/oc_mqtt_al/oc_mqtt_al.c #if 0 __attribute__ ((weak)) int oc_mqtt_imp_init(void) { LINK_LOG_DEBUG("%s:###please implement oc mqtt by yourself####",__FUNCTION__); return 0; } __attribute__ ((weak)) int oc_mqtt_demo_main(void) { LINK_LOG_WARN("Please implement the oc mqtt v5 demo yourself"); return -1; } #endif extern int oc_mqtt_demo_main(void); 

• 修改GPIO查找方式

因为GPIO框架修改了设备驱动注册的管脚号，导致应用无法根据HCS的引脚操作对应的GPIO，此问题已经提issue，如果该问题已解决，可以忽略此步骤。

打开drivers/framework/support/platform/src/gpio/gpio_manager.c，将cntlr->start = start；注释即可。

static int32_t GpioManagerAdd(struct PlatformManager *manager, struct PlatformDevice *device) { uint16_t start; struct GpioCntlr *cntlr = CONTAINER_OF(device, struct GpioCntlr, device); if ((start = GpioCntlrQueryStart(cntlr, &manager->devices)) >= GPIO_NUM_MAX) { PLAT_LOGE("GpioCntlrAdd: query range for start:%d fail:%d", cntlr->start, start); return HDF_ERR_INVALID_PARAM; } // cntlr->start = start; DListInsertTail(&device->node, &manager->devices); PLAT_LOGI("%s: start:%u count:%u", __func__, cntlr->start, cntlr->count); return HDF_SUCCESS; } 

• 将对应的驱动文件复制到drvier对应目录：

因为主仓代码中未将对应的驱动文件合并到driver/adpater/platform对应的目录下，固需要手动将文件拷贝到对应目录。若主仓已合入，可忽略此步骤。

// 拷贝gpio驱动 cp -af device/soc/allwinner/xradio/drivers/gpio/gpio_xradio.* driver/adpater/platform/gpio // 修改driver/adpater/platform/gpio/BUILD.gn文件，加上gpio_xradio的编译 hdf_driver(module_name) { sources = [] if (defined(LOSCFG_SOC_COMPANY_BESTECHNIC)) { sources += [ "gpio_bes.c" ] } if (defined(LOSCFG_SOC_COMPANY_ALLWINNER)) { sources += [ "gpio_xradio.c" ] } include_dirs = [ "." ] } 

为了节省ram资源，可以把无用的资源先关闭，如关闭内部codec，将 device/soc/allwinner/xradio/xr806/project/prj_config.h中的PRJCONF_INTERNAL_SOUNDCARD_EN设置为0，如下：

/* Xradio internal codec sound card enable/disable */ #define PRJCONF_INTERNAL_SOUNDCARD_EN 0 

4、代码编译

#首先可以查看一下hb的版本，如果hb版本为0.4.4版本就不需要更新。 

查看hb版本

hb --version

更新hb, 以下指令需要在openharmony SDK根目录执行

pip3 uninstall ohos_build
pip3 install build/li

 编译命令： hb set // 如果是第一次编译，Input code path 命令行中键入"./" 指定OpenHarmony工程编译根目录后 回车， 

如下图所示，使用键盘上下键选中wifi_skylark

hb build // 如果需要全量编译，可以添加-f 选项 

生成的固件保存在out/xradio/smart_weight_scale目录下

5、固件烧录

参照文档: XR806快速上手指导文档

6、设备配网

在设备上电前需准备好安装了数字管家应用的HarmonyOS手机，详情见数字管家应用开发, 并在设置中开启手机的NFC功能；

写设备NFC标签，详细操作见设备NFC标签指导文档;

烧录完成后，上电。开发者在观察开发板上状态LED灯以８Hz的频率闪烁时，将手机上半部靠近开发板NFC标签处(无NFC标签的可用NFC贴纸替代)；

碰一碰后手机将自动拉起数字管家应用并进入配网状态;

配网过程中需要 连接设备的AP热点，然后填写需要配置的wifi的密码;

最后点击配置，手机会将ssid以及对应的密码通过AP热点发送到设备。

本文整理自：https://bbs.aw-ol.com/topic/1116/

作者@budbool