[RVB2601 Creative Application Development] 6. Online Weather Clock Draft Version
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1. Description
Basic functions of Internet weather clock:
1. RTC real-time clock display and automatic time synchronization upon power on
2. Real-time weather information display
3. Future weather forecast (the plan is to provide weather forecast for the next 3 days, but I found that the free version of YY Weather can only forecast the weather for the current day and the next day )
In fact, the function is quite simple, it just took a long time to set up WiFi networking and NTP. Although NTP can currently synchronize time, it still feels imperfect.
2. Software modules/open source libraries used
1. u8g2 open source graphics library for display
2. cJSON open source library for parsing data in JSON format
3. MulitButton open source library for button operation
4. At the OS level, a software timer is used to periodically obtain and display time, with a period of 1s;
Message queues are used to implement cross-task communication and transmit weather data;
Events are used for task synchronization.
3. Key Functions
1. NTP network time synchronization
Regarding the NTP issue, several big guys in the forum have already written a manual to avoid pitfalls. There will be basically no problem with the configuration according to their posts.
I use version 7.4.6 of the ntp component, and I can't get version 7.4.3 to work.
The current version sometimes takes several attempts to succeed, and I have built a retry mechanism in my own code.
After ntp time synchronization is completed, set the event to let the GUI task area obtain the time for display:
static void network_event(uint32_t event_id, const void *param, void *context)
{
switch(event_id) {
case EVENT_NETMGR_GOT_IP:
LOGD(TAG, "net got ip");
do
{
ntp_status = ntp_sync_time(NULL);
}while(ntp_status != 0);
/*设置事件标志(0x00000001), 或操作*/
aos_event_set(&ntp_complete_event, EVENT_FLAG_1, AOS_EVENT_OR);
//cjson_test ();
break;
case EVENT_NETMGR_NET_DISCON:
LOGD(TAG, "net disconnect");
break;
}
/*do exception process */
app_exception_event(event_id);
}
2. GUI Tasks
The GUI task is to receive messages from the message queue and display different contents according to the message type.
The main body is as follows:
while (1) {
//button_test();
button_ticks();
//check data receive
if(0 != aos_queue_is_valid(&queue_weather))
{
if(0 == aos_queue_recv(&queue_weather, 5, queue_msg, &quene_size))
{
if(display_page == 1)//显示时钟
{
rtc_display_control(queue_msg);
}
else if(display_page == 2)//显示实时天气
{
weather_real_time_display(queue_msg);
}
else if((display_page == 3) || (display_page == 4))//显示预报天气
{
weather_forecast_display(queue_msg);
}
}
}
}
3. Buttons
The button operation transplanted the MultiButton library, and only used the click events of two onboard buttons, one for page up and one for page down:
//按键事件的callback
static void BTN1_SINGLE_Click_Handler(void* btn)
{
char temp[50];
display_page++;
if(display_page > 4)
{
display_page = 1;
}
if(display_page == 1)
{
temp[0] = 50;//切到第一屏
temp[1] = '\0';
if(0 != aos_queue_send(&queue_weather, temp, sizeof(temp)))
{
printf("send display_page error-->button2 singel click\n");
}
}
else if(display_page == 2)//实时天气获取与显示
{
quest_weather();
}
else if((display_page >= 3) && (display_page <=4 ))//未来某天天气预报
{
quest_weather_forecast();
}
}
//按键事件的callback
static void BTN2_SINGLE_Click_Handler(void* btn)
{
char temp[50];
if(display_page > 1)
{
display_page--;
if(display_page == 1)
{
temp[0] = 50;//切到第一屏
temp[1] = '\0';
if(0 != aos_queue_send(&queue_weather, temp, sizeof(temp)))
{
printf("send display_page error-->button2 singel click\n");
}
}
else if(display_page == 2)//实时天气获取与显示
{
quest_weather();
}
else if((display_page >= 3) && (display_page <=4 ))//未来某天天气预报
{
quest_weather_forecast();
}
}
}
4. Effect display
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