Diff: main.cpp

Revision:

0:98c914fd9dae

Child:

1:fe2e90c1c706

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jun 18 14:21:36 2020 +0000
@@ -0,0 +1,157 @@
+#include "mbed.h"
+#include "GUI.h"
+#include "mbed_events.h"
+#include "ntp-client/NTPClient.h"
+Thread netTimeThreadHandle;
+WiFiInterface *wifi;
+#define MBED_CONF_APP_WIFI_SSID "brackenhillc"
+#define MBED_CONF_APP_WIFI_PASSWORD "1broches"
+EventQueue *displayQueue;
+Semaphore WiFiSemaphore;
+/******************************************************************************************
+*
+* Display Functions
+*
+********************************************************************************************/
+#define DISP_LEFTMARGIN 10
+#define DISP_TOPMARGIN 4
+#define DISP_LINESPACE 2
+// updateDisplayWiFiStatus
+// Used to display the wifi status
+void updateDisplayWiFiStatus(char *status)
+{
+    GUI_SetFont(GUI_FONT_16_1);
+    GUI_DispStringAt(status,DISP_LEFTMARGIN, DISP_TOPMARGIN);
+    free(status);
+}
+// updateDisplayWiFiConnectAttempts
+// This function displays the number of attempted connections
+void updateDisplayWiFiConnectAttempts(int count)
+{
+    char buffer[128];
+    snprintf(buffer,sizeof(buffer),"WiFi Connect Attempts = %d",count);
+    GUI_SetFont(GUI_FONT_16_1);
+    GUI_DispStringAt(buffer,DISP_LEFTMARGIN, DISP_TOPMARGIN + (GUI_GetFontSizeY()+DISP_LINESPACE) );
+}
+// updateDisplayNTPFailed
+// updates the display with the number of time the NTP Server has been called
+// and got a failed response
+void updateDisplayNTPFailed(void)
+{
+    static int count=0;
+    char buffer[128];
+    count = count + 1;
+    snprintf(buffer,sizeof(buffer),"NTP Update Failure = %d\n",count);
+    GUI_SetFont(GUI_FONT_16_1);
+    GUI_DispStringHCenterAt(buffer,LCD_GetXSize()/2,LCD_GetYSize() - 2*GUI_GetFontSizeY()); // near the bottom
+}
+// updateDisplayNTPCount
+// updates the display with the number of time the NTP Server has been called
+void updateDisplayNTPCount(void)
+{
+    static int count=0;
+    char buffer[128];
+    count = count + 1;
+    snprintf(buffer,sizeof(buffer),"NTP Updates = %d\n",count);
+    GUI_SetFont(GUI_FONT_16_1);
+    GUI_DispStringHCenterAt(buffer,LCD_GetXSize()/2,LCD_GetYSize() - GUI_GetFontSizeY()); // near the bottom
+}
+// updateDisplayTime
+// This function updates the time on the screen
+void updateDisplayTime()
+{
+    time_t rawtime;
+    struct tm * timeinfo;
+    char buffer [128];
+    time (&rawtime);
+    //rawtime = rawtime - (4*60*60); // UTC - 4hours ... serious hack which only works in summer
+    rawtime = rawtime + 3600;
+    timeinfo = localtime (&rawtime);
+    strftime (buffer,sizeof(buffer),"%r",timeinfo);
+    GUI_SetFont(GUI_FONT_32B_1);
+    GUI_DispStringHCenterAt(buffer,LCD_GetXSize()/2,LCD_GetYSize()/2 - GUI_GetFontSizeY()/2);
+    strftime (buffer,sizeof(buffer),"%D",timeinfo);
+    GUI_SetFont(GUI_FONT_32B_1);
+    GUI_DispStringHCenterAt(buffer,LCD_GetXSize()/2,LCD_GetYSize()/2 - GUI_GetFontSizeY()/2 + 40);
+}
+/******************************************************************************************
+* NTPTimeThread
+* This thread calls the NTP Timeserver to get the UTC time
+* It then updates the time in the RTC
+* And it updates the display by adding an event to the display queue
+********************************************************************************************/
+void NTPTimeThread()
+{
+    static time_t old_timestamp = 0, timestamp;
+    NTPClient ntpclient(wifi);
+    while(1) {
+        if(wifi->get_connection_status() == NSAPI_STATUS_GLOBAL_UP) {
+            timestamp = ntpclient.get_timestamp();
+            if (timestamp < old_timestamp) {
+                displayQueue->call(updateDisplayNTPFailed);
+            } else {
+                set_time(timestamp);
+                displayQueue->call(updateDisplayNTPCount);
+            }
+        }
+        old_timestamp = timestamp;
+        ThisThread::sleep_for(300000); // Goto the NTP server every 5 minutes
+    }
+}
+/******************************************************************************************
+*
+* Main & WiFi Thread
+*
+********************************************************************************************/
+// wifiStatusCallback
+// Changes the display when the wifi status is changed
+void wifiStatusCallback(nsapi_event_t status, intptr_t param)
+{
+    const int buffSize=40;
+    char *statusText;
+    statusText = (char *)malloc(buffSize);
+    switch(param) {
+        case NSAPI_STATUS_LOCAL_UP:
+            snprintf(statusText,buffSize,"WiFi IP = %s",wifi->get_ip_address());
+            break;
+        case NSAPI_STATUS_GLOBAL_UP:
+            snprintf(statusText,buffSize,"WiFi IP = %s",wifi->get_ip_address());
+            break;
+        case NSAPI_STATUS_DISCONNECTED:
+            WiFiSemaphore.release();
+            snprintf(statusText,buffSize,"WiFi Disconnected");
+            break;
+        case NSAPI_STATUS_CONNECTING:
+            snprintf(statusText,buffSize,"WiFi Connecting");
+            break;
+        default:
+            snprintf(statusText,buffSize,"Not Supported");
+            break;
+    }
+    displayQueue->call(updateDisplayWiFiStatus,statusText);
+}
+int main()
+{
+    int wifiConnectionAttempts;
+    int ret;
+    GUI_Init();
+    displayQueue = mbed_event_queue();
+    displayQueue->call_every(1000, &updateDisplayTime);
+    wifi = WiFiInterface::get_default_instance();
+    wifi->attach(&wifiStatusCallback);
+    while(1) {
+        wifiConnectionAttempts = 1;
+        do {
+            ret = wifi->connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2);
+            displayQueue->call(updateDisplayWiFiConnectAttempts,wifiConnectionAttempts);
+            if (ret != 0) {
+                wifiConnectionAttempts += 1;
+                ThisThread::sleep_for(2000); // If for some reason it doesnt work wait 2s and try again
+            }
+        } while(ret !=0);
+// If the NTPThread is not running... then start it up
+        if(netTimeThreadHandle.get_state() == Thread::Deleted)
+            netTimeThreadHandle.start(NTPTimeThread);
+        WiFiSemaphore.acquire();
+    }
+}
\ No newline at end of file