——来自迪文开发者论坛
本期为大家推送迪文开发者论坛获奖开源案例——基于T5L的便携功率计解决方案。该方案通过智能屏串口进行通信，实时接收监测到的电流、电压和功率数据，并同步显示在屏幕上，使用户可以直观地监测电气参数状态。此外，该方案还支持WiFi联网，无论是手机、PC还是其他移动设备，用户均可轻松访问电气数据，大幅提升了数据管理的便捷性与灵活性。适用于电气工程、智能家居和工业自动化等领域。
【演示视频】
完整开发资料含迪文屏DGUS工程资料与C51代码，获取方式：
1. 前往迪文开发者论坛获取：http://inforum.dwin.com.cn:20080/forum.php?mod=viewthread&tid=10600&extra=&_dsign=e227a7c6
2. 微信公众号中回复“便携功率计”获取。
【UI素材展示】
【GUI工程设计】
【程序代码设计】
主控板将I2C采集的电流、电压和功率数据，通过串口发送给迪文智能屏，同时通过UDP将数据发送至上位机，部分参考代码如下：
static void wifi_event_handler(void* arg, esp_event_base_t event_base,int32_t event_id, void* event_data)
{
if (event_id == WIFI_EVENT_AP_STACONNECTED)
{
wifi_event_ap_staconnected_t* event = (wifi_event_ap_staconnected_t*) event_data;
ESP_LOGI(TAG, "station "MACSTR" join, AID=%d",MAC2STR(event->mac), event->aid);
}
else if (event_id == WIFI_EVENT_AP_STADISCONNECTED)
{
wifi_event_ap_stadisconnected_t* event = (wifi_event_ap_stadisconnected_t*) event_data;
ESP_LOGI(TAG, "station "MACSTR" leave, AID=%d",MAC2STR(event->mac), event->aid);
}
}
void wifi_init_softap(void)
{
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_ap();
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,ESP_EVENT_ANY_ID,&wifi_event_handler,NULL,NULL));
wifi_config_t wifi_config =
{
.ap = {
.ssid = EXAMPLE_ESP_WIFI_SSID,
.ssid_len = strlen(EXAMPLE_ESP_WIFI_SSID),
.channel = EXAMPLE_ESP_WIFI_CHANNEL,
.password = EXAMPLE_ESP_WIFI_PASS,
.max_connection = EXAMPLE_MAX_STA_CONN,
.authmode = WIFI_AUTH_WPA_WPA2_PSK
},
};
if (strlen(EXAMPLE_ESP_WIFI_PASS) == 0)
{
wifi_config.ap.authmode = WIFI_AUTH_OPEN;
}
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_config));
ESP_ERROR_CHECK(esp_wifi_start());
ESP_LOGI(TAG, "wifi_init_softap finished. SSID:%s password:%s channel:%d",
EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS, EXAMPLE_ESP_WIFI_CHANNEL);
}
esp_ip4_addr_t ip_addr;
static void udp_server_task(void *pvParameters)
{
// 将IPv4地址转换为字符串格式的IP地址
char ip_addr_str[INET_ADDRSTRLEN];
inet_ntoa_r(ip_addr.addr, ip_addr_str, sizeof(ip_addr_str));
// 设置广播地址和接收方的端口号
struct sockaddr_in broadcast_addr =
{
.sin_addr.s_addr = ip_addr.addr | htonl(0xFF), //广播地址，其类型为uint32_t
.sin_family = AF_INET,
.sin_port = htons(BROADCAST_PORT),
};
// 将广播地址转换为字符串
ESP_LOGI(TAG, "broadcast_addr IP: %s", inet_ntoa(broadcast_addr.sin_addr.s_addr));
// Create a socket for UDP broadcast
int broadcast_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (broadcast_socket < 0)
{
ESP_LOGE(TAG, "Failed to create socket: %d", broadcast_socket);
goto error;
}
// 设置套接字选项以启用地址重用
int reuseEnable = 1;
setsockopt(broadcast_socket, SOL_SOCKET, SO_REUSEADDR, &reuseEnable, sizeof(reuseEnable));
// 使能广播
int broadcast_enable = 1;
if (setsockopt(broadcast_socket, SOL_SOCKET, SO_BROADCAST, &broadcast_enable, sizeof(broadcast_enable)) < 0) {
ESP_LOGE(TAG, "Failed to enable broadcasting");
close(broadcast_socket);
goto error;
}
// Send the broadcast message every BROADCAST_INTERVAL_MS milliseconds
while (1) {
// 创建一个 JSON 对象，并添加三个属性
cJSON *json = cJSON_CreateObject();
cJSON_AddStringToObject(json, "device", "EZPower");
cJSON_AddStringToObject(json, "ip", ip_addr_str);
cJSON_AddNumberToObject(json, "port", 3334);
// 将 JSON 数据转换为字符串
char *json_str = cJSON_Print(json);
ESP_LOGI(TAG, "Broadcasting message: %s", json_str);
dwin_screen_send(json_str, strlen(json_str));
int ret = sendto(broadcast_socket, json_str, strlen(json_str), 0, (struct sockaddr *)&broadcast_addr, sizeof(broadcast_addr));
if (ret < 0)
{
ESP_LOGE(TAG, "Failed to send broadcast message: %d", ret);
}
cJSON_Delete(json);
free(json_str);
vTaskDelay(2000 / portTICK_PERIOD_MS);
}
error:
vTaskDelete(NULL);
}
void app_main(void)
{
//Initialize NVS
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
ESP_LOGI(TAG, "ESP_WIFI_MODE_AP");
wifi_init_softap();
ip_addr.addr = 0xFF04A8C0;
dwin_init();
xTaskCreate(udp_server_task, "udp_server", 4096, (void*)AF_INET, 5, NULL);
}
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