OpenHarmony南向开发案例:【智能体重秤】

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。

2.实物简介

实物图

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

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

3.实物操作体验

操作图

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

鸿蒙开发文档参考:qr23.cn/AKFP8k点击或者复制转到即可。

搜狗高速浏览器截图20240326151547.png

设备侧代码下载

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

10

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/lite
```

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

2

 
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
  1. 在设备上电前需准备好安装了数字管家应用的HarmonyOS手机, 并在设置中开启手机的NFC功能;
  2. 写设备NFC标签;
  3. 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);
  4. 碰一碰后手机将自动拉起数字管家应用并进入配网状态;
  5. 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;
  6. 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。

配网动图

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