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，
![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
- 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
![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);
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;
}
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]()
本文整理自：https://bbs.aw-ol.com/topic/1116/
作者@budbool
