OpenHarmony項(xiàng)目實(shí)戰(zhàn)：智能體重秤

一、簡(jiǎn)介

本demo基于OpenHarmony3.1Beta版本開發(fā)，該樣例能夠接入數(shù)字管家應(yīng)用，通過(guò)數(shù)字管家應(yīng)用監(jiān)測(cè)體重秤上報(bào)數(shù)據(jù)，獲得當(dāng)前測(cè)量到的體重，身高，并在應(yīng)用端形成一段時(shí)間內(nèi)記錄的體重值，以折線圖的形式表現(xiàn)出來(lái)，根據(jù)計(jì)算的BMI值來(lái)提醒當(dāng)前身體健康狀態(tài)，推送健康小知識(shí)。

1.交互流程

交互圖

如上圖所示，智能體重稱整體方案原理圖可以大致分成：智能體重稱設(shè)備、數(shù)字管家應(yīng)用、云平臺(tái)三部分。智能體重稱通過(guò)MQTT協(xié)議連接華為IOT物聯(lián)網(wǎng)平臺(tái)，從而實(shí)現(xiàn)命令的接收和屬性上報(bào)。 關(guān)于智能設(shè)備接入華為云IoT平臺(tái)的詳細(xì)細(xì)節(jié)可以參考 連接IOT云平臺(tái)指南；智能設(shè)備同數(shù)字管家應(yīng)用之間的設(shè)備模型定義可以參考profile .

2.實(shí)物簡(jiǎn)介

如上圖示，左邊為全志xr806模組，右邊為超聲波測(cè)距模塊，echo腳連接PA19，Triq腳連接PA20,Vcc腳連接5V電源，Gnd腳接地，

如上圖示，右邊為稱重模塊，clk腳接PB15，dt腳接PB14，vcc腳接5V，gnd腳接地，稱重傳感器紅色線接E+，黑色線接E-，白色線接A-，綠色線接A+

左邊xr806模塊左下角k1按鍵，長(zhǎng)按k1按鍵不放，同時(shí)上電，4-5秒后松開按鍵，可以清除已保存得配網(wǎng)信息

xr806模塊，在設(shè)備正常工作后，按k1按鍵，可以初始化當(dāng)前得重量為0，高度為0

二、 快速上手

1.硬件準(zhǔn)備

全志xr806模組

hcsr04超聲波模塊

hx711稱重模塊帶支架托盤

預(yù)裝HarmonyOS手機(jī)一臺(tái)

2、環(huán)境準(zhǔn)備

參照文檔: XR806快速上手指導(dǎo)文檔

3、編譯前準(zhǔn)備

設(shè)備側(cè)代碼下載
具體倉(cāng)庫(kù)地址：https://gitee.com/openharmony-sig/knowledge_demo_smart_home/

下載方式：使用git 命令下載，指令如下（用戶也可以根據(jù)需要將該倉(cāng)庫(kù)fork到自己的目錄下后進(jìn)行下載）

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

代碼拷貝

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代碼下載替換

當(dāng)前官方soc代碼由于DHCP暫未適配，所以暫時(shí)不支持AP模式，這時(shí)需要下載并替換之前SOC代碼。如果官方soc代碼已修復(fù)該問(wèn)題，可忽略此步驟。

git clone https://gitee.com/moldy-potato-chips/xr806_-ap_mode.git
mv ~/openharmony/device/soc/allwinner ~/allwinner.org			// 不建議直接刪除，
cp -raf xr806_-ap_mode ~/openharmony/device/soc/allwinner

整合并修改完成后的目錄結(jié)構(gòu)如下圖

修改文件

修改編譯依賴
打開 device/soc/allwinner/xradio/xr806/BUILD.gn，添加應(yīng)用依賴(deps字段):

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

修改編譯方式
將demo依賴的庫(kù)編譯方式(static_library)修改為(source_set):
具體依賴查看demo_smart_weight_scale目錄下的BUILD.gn:

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

其中//third_party/cJSON目錄下的BUILD.gn建議參照下面的修改:

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

third_party/iot_link目錄下的各級(jí)使用到的BUILD.gn也需要將編譯方式修改為source_set，或者將所有需要編譯的文件放在iot_link目錄的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",
        "http://third_party/mbedtls/include/",
        "http://third_party/mbedtls/include/",
        "http://third_party/cJSON",
        "http://kernel/liteos_m/components/cmsis/2.0",
        "http://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

測(cè)試發(fā)現(xiàn)，當(dāng)fd為0的時(shí)候，在執(zhí)行recv時(shí)會(huì)立馬返回-1，因此做下面規(guī)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;
	...
}

系統(tǒng)setsockopt函數(shù)未適配，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 = %dn", __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

在文件頂部添加打印函數(shù)定義以及添加mbedtls_calloc以及mbedtls_free的定義，否則編譯會(huì)提示錯(cuò)誤：

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

系統(tǒng)部分mbedtls接口不一致，固需要注釋部分接口代碼：

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()函數(shù)中，也需要注釋掉未實(shí)現(xiàn)的接口，否則編譯報(bào)錯(cuò)：

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中添加對(duì)應(yīng)timersub和timeradd的實(shí)現(xiàn)(系統(tǒng)中未實(shí)現(xiàn)該函數(shù))：

// 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.編譯中會(huì)有部分頭文件提示找不到，這個(gè)時(shí)候直接將其注釋即可

(iot_link/network/mqtt/paho_mqtt/port/paho_osdepends.h):

#define INVALID_SOCKET SOCKET_ERROR
// #include 
#include 
#include 
// #include 
// #include 
// #include 
// #include 
#include 
#include 
#include 
#include 
#include 
#include 
#endif

#if defined(WIN32)
#include 
#else
// #include 
// #include 
#endif

5.因?yàn)槿跻脤?dǎo)致無(wú)法鏈接相關(guān)符號(hào)，因此需要注釋以下幾個(gè)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?yàn)镚PIO框架修改了設(shè)備驅(qū)動(dòng)注冊(cè)的管腳號(hào)，導(dǎo)致應(yīng)用無(wú)法根據(jù)HCS的引腳操作對(duì)應(yīng)的GPIO，此問(wèn)題已經(jīng)提issue，如果該問(wèn)題已解決，可以忽略此步驟。

打開drivers/framework/support/platform/src/gpio/gpio_manager.c，將cntlr->start = start；注釋即可。

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;
}

將對(duì)應(yīng)的驅(qū)動(dòng)文件復(fù)制到drvier對(duì)應(yīng)目錄：

因?yàn)橹鱾}(cāng)代碼中未將對(duì)應(yīng)的驅(qū)動(dòng)文件合并到driver/adpater/platform對(duì)應(yīng)的目錄下，固需要手動(dòng)將文件拷貝到對(duì)應(yīng)目錄。若主倉(cāng)已合入，可忽略此步驟。

// 拷貝gpio驅(qū)動(dòng)
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的編譯

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 = [ "." ]
}

為了節(jié)省ram資源，可以把無(wú)用的資源先關(guān)閉，如關(guān)閉內(nèi)部codec，將 device/soc/allwinner/xradio/xr806/project/prj_config.h中的PRJCONF_INTERNAL_SOUNDCARD_EN設(shè)置為0，如下：

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

4、代碼編譯

#首先可以查看一下hb的版本，如果hb版本為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根目錄執(zhí)行

pip3 uninstall ohos_build
pip3 install build/li

編譯命令：
hb set  // 如果是第一次編譯，Input code path 命令行中鍵入"./" 指定OpenHarmony工程編譯根目錄后 回車，

如下圖所示，使用鍵盤上下鍵選中wifi_skylark

hb build // 如果需要全量編譯，可以添加-f 選項(xiàng)

生成的固件保存在out/xradio/smart_weight_scale目錄下

5、固件燒錄

參照文檔: XR806快速上手指導(dǎo)文檔

6、設(shè)備配網(wǎng)

在設(shè)備上電前需準(zhǔn)備好安裝了數(shù)字管家應(yīng)用的HarmonyOS手機(jī)，詳情見數(shù)字管家應(yīng)用開發(fā), 并在設(shè)置中開啟手機(jī)的NFC功能；

寫設(shè)備NFC標(biāo)簽，詳細(xì)操作見設(shè)備NFC標(biāo)簽指導(dǎo)文檔;

燒錄完成后，上電。開發(fā)者在觀察開發(fā)板上狀態(tài)LED燈以８Hz的頻率閃爍時(shí)，將手機(jī)上半部靠近開發(fā)板NFC標(biāo)簽處(無(wú)NFC標(biāo)簽的可用NFC貼紙?zhí)娲?；

碰一碰后手機(jī)將自動(dòng)拉起數(shù)字管家應(yīng)用并進(jìn)入配網(wǎng)狀態(tài);

配網(wǎng)過(guò)程中需要 連接設(shè)備的AP熱點(diǎn)，然后填寫需要配置的wifi的密碼;

最后點(diǎn)擊配置，手機(jī)會(huì)將ssid以及對(duì)應(yīng)的密碼通過(guò)AP熱點(diǎn)發(fā)送到設(shè)備。

審核編輯 黃宇