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    OpenHarmony智能体重秤

    Wireless & Analog Series
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    • q1215200171
      budbool LV 9 last edited by

      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
      12.png
      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
      13.jpg

      如上图示,左边为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,

      14.jpg

      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

      • 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

      2.png

      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
      10.png

      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。

      1.gif

      原文链接:https://growing.openharmony.cn/mainPlay/detail?sampleId=3300
      gitee地址:https://gitee.com/openharmony-sig/knowledge_demo_smart_home/tree/master/dev/docs/smart_weight_scale#智能体重秤

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