【OpenHarmony开发样例】基于全志XR806开发板开发的智能体重秤

电源

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

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

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

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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/

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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

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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" ]
}

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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",
]

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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" ]
}

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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"
]
}

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修改iot_link中的部分文件

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。
3. static int __socket_connect(Network *n, const char *host, int port)
4. {
5. ...
6. int tmpfd = socket(AF_INET,SOCK_STREAM,0); // to skip fd = 0;
7. fd = socket(AF_INET,SOCK_STREAM,0);
8. if(fd == -1) {
9. return ret;
10. }
11. close(tmpfd); // to skip fd = 0;
12. ...
13. }
15. 系统setsockopt函数未适配，因此需要做下面的修改：
17. static int __socket_read(void *ctx, unsigned char *buf, int len, int timeout)
18. {
19. int fd;
20. int ret = 0;
21. #if 0
22. struct timeval timedelay = {timeout / 1000, (timeout % 1000) * 1000};
23. if(NULL== uf)
24. {
25. return ret;
26. }
28. fd = (int)(intptr_t)ctx; ///< socket could be zero
30. if (timedelay.tv_sec < 0 || (timedelay.tv_sec == 0 && timedelay.tv_usec <= 0))
31. {
32. timedelay.tv_sec = 0;
33. timedelay.tv_usec = 100;
34. }
36. if(0 != setsockopt(fd,SOL_SOCKET,SO_RCVTIMEO,&timedelay,sizeof(struct timeval)))
37. {
38. return ret; //could not support the rcv timeout
39. }
40. int bytes = 0;
41. while (bytes < len) {
42. int rc = recv(fd, &buf[bytes], (size_t)(len - bytes), 0);
43. printf("[%s|%s|%d]fd = %d, rc = %dn", __FILE__,__func__,__LINE__, fd, rc);
44. if (rc == -1) {
45. if (errno != EAGAIN && errno != EWOULDBLOCK) {
46. bytes = -1;
47. }
48. break;
49. } else if (rc == 0) {
50. bytes = 0;
51. break;
52. } else {
53. bytes += rc;
54. }
55. }
56. return bytes;
57. #else
58. int bytes = 0;
59. fd_set fdset;
61. struct timeval timedelay = {timeout / 1000, (timeout % 1000) * 1000};
62. if(NULL== buf)
63. {
64. return ret;
65. }
67. fd = (int)(intptr_t)ctx; ///< socket could be zero
69. if (timedelay.tv_sec < 0 || (timedelay.tv_sec == 0 && timedelay.tv_usec <= 0))
70. {
71. timedelay.tv_sec = 0;
72. timedelay.tv_usec = 100;
73. }
74. timedelay.tv_sec = 2;
75. FD_ZERO(&fdset);
76. FD_SET(fd, &fdset);
78. ret = select(fd + 1, &fdset, NULL, NULL, &timedelay);
79. if (ret > 0) {
80. while (bytes < len) {
81. int rc = recv(fd, &buf[bytes], (size_t)(len - bytes), 0);
82. // printf("[%s|%s|%d]fd = %d, rc = %d, errno=%d(%s)n", __FILE__,__func__,__LINE__, fd, rc,errno, strerror(errno));
83. if (rc == -1) {
84. if (errno != EAGAIN && errno != EWOULDBLOCK) {
85. bytes = -1;
86. }
87. break;
88. } else if (rc == 0) {
89. bytes = 0;
90. break;
91. } else {
92. bytes += rc;
93. }
94. }
95. }
97. return bytes;
98. #endif
99. }
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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：
1. #define MBEDTLS_LOG LINK_LOG_DEBUG
2. #ifndef mbedtls_calloc
3. #define mbedtls_calloc calloc
4. #endif
5. #ifndef mbedtls_free
6. #define mbedtls_free free
7. #endif
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系统部分mbedtls接口不一致，固需要注释部分接口代码：
1. mbedtls_ssl_context dtls_ssl_new(dtls_establish_info_s *info, char plat_type)
2. {
3. ...
4. if (info->psk_or_cert == VERIFY_WITH_PSK)
5. {
6. /*
7. if ((ret = mbedtls_ssl_conf_psk(conf,
8. info->v.p.psk,
9. info->v.p.psk_len,
10. info->v.p.psk_identity,
11. strlen((const char *)info->v.p.psk_identity))) != 0)
12. {
13. MBEDTLS_LOG("mbedtls_ssl_conf_psk failed: -0x%x", -ret);
14. goto exit_fail;
15. }
16. */
17. }
18. ...
19. }
21. int dtls_shakehand(mbedtls_ssl_context *ssl, const dtls_shakehand_info_s *info)
22. {
23. ...
24. if (MBEDTLS_SSL_IS_CLIENT == info->client_or_server)
25. {
26. ret = mbedtls_net_connect(server_fd, info->u.c.host, info->u.c.port, info->udp_or_tcp);
27. if( 0 != ret)
28. {
29. ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
30. goto exit_fail;
31. }
32. }
33. else
34. {
35. //server_fd = (mbedtls_net_context*)atiny_net_bind(NULL, info->u.s.local_port, MBEDTLS_NET_PROTO_UDP);
36. ///< --TODO ,not implement yet
37. }
38. ...
39. }
41. void dtls_init(void)
42. {
43. (void)mbedtls_platform_set_calloc_free(calloc, free);
44. (void)mbedtls_platform_set_snprintf(snprintf);
45. // (void)mbedtls_platform_set_printf(printf);
46. }
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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：
1. int dtls_imp_init(void)
2. {
3. int ret =-1;
5. // (void)mbedtls_platform_set_calloc_free(calloc, free);
6. // (void)mbedtls_platform_set_snprintf(snprintf);
7. // (void)mbedtls_platform_set_printf(printf);
8. ret = dtls_al_install(&s_mbedtls_io);
10. return ret;
11. }
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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)：
1. // add this for "timersub" && "timeradd"
2. #ifndef timersub
3. #define timersub(s,t,a) (void) ( (a)->tv_sec = (s)->tv_sec - (t)->tv_sec,
4. ((a)->tv_usec = (s)->tv_usec - (t)->tv_usec) < 0 &&
5. ((a)->tv_usec += 1000000, (a)->tv_sec--) )
6. #endif
7. #ifndef timeradd
8. #define timeradd(s,t,a) (void) ( (a)->tv_sec = (s)->tv_sec + (t)->tv_sec,
9. ((a)->tv_usec = (s)->tv_usec + (t)->tv_usec) >= 1000000 &&
10. ((a)->tv_usec -= 1000000, (a)->tv_sec++) )
11. #endif
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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):
1. #define INVALID_SOCKET SOCKET_ERROR
2. // #include
3. #include
4. #include
5. // #include
6. // #include
7. // #include
8. // #include
9. #include
10. #include
11. #include
12. #include
13. #include
14. #include
15. #endif
17. #if defined(WIN32)
18. #include
19. #else
20. // #include
21. // #include
22. #endif
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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。
1. 文件一 third_party/iot_link/network/dtls/dtls_al/dtls_al.c
2. #if 0
3. __attribute__((weak)) int dtls_imp_init(void)
4. {
5. LINK_LOG_DEBUG("%s:###please implement dtls by yourself####",__FUNCTION__);
6. return -1;
7. }
8. #endif
9. extern int dtls_imp_init(void);
11. 文件二 third_party/iot_link/network/mqtt/mqtt_al/mqtt_al.c
12. #if 0
13. __attribute__((weak)) int mqtt_imp_init(void)
14. {
15. LINK_LOG_DEBUG("%s:###please implement mqtt by yourself####",__FUNCTION__);
16. return -1;
17. }
18. #endif
19. extern int mqtt_imp_init(void);
21. 文件三 third_party/iot_link/oc_mqtt/oc_mqtt_al/oc_mqtt_al.c
22. #if 0
23. __attribute__ ((weak)) int oc_mqtt_imp_init(void)
24. {
25. LINK_LOG_DEBUG("%s:###please implement oc mqtt by yourself####",__FUNCTION__);
26. return 0;
27. }
29. __attribute__ ((weak)) int oc_mqtt_demo_main(void)
30. {
31. LINK_LOG_WARN("Please implement the oc mqtt v5 demo yourself");
32. return -1;
33. }
34. #endif
35. extern int oc_mqtt_demo_main(void);
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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;
}

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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。
1. // 拷贝gpio驱动
2. cp -af device/soc/allwinner/xradio/drivers/gpio/gpio_xradio.* driver/adpater/platform/gpio
4. // 修改driver/adpater/platform/gpio/BUILD.gn文件，加上gpio_xradio的编译
6. hdf_driver(module_name) {
7. sources = []
8. if (defined(LOSCFG_SOC_COMPANY_BESTECHNIC)) {
9. sources += [ "gpio_bes.c" ]
10. }
12. if (defined(LOSCFG_SOC_COMPANY_ALLWINNER)) {
13. sources += [ "gpio_xradio.c" ]
14. }
16. include_dirs = [ "." ]
17. }
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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：
1. /* Xradio internal codec sound card enable/disable */
2. #define PRJCONF_INTERNAL_SOUNDCARD_EN 0
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