實驗原理：
STM32的實時時鐘（RTC）是一個獨立的定時器，有一組連續計數的
計數器，通過軟體來對其進行相關的配置，可以提供時鐘功能，通過修改計
數器的的值，可以調整時鐘。最終通過emWin在螢幕上進行顯示。
示例截圖：
原始碼下載連結：
連結：http://pan.baidu.com/s/1sloF1fv 密碼：gtwo
GMT43購買連結：
核心程式碼：
static void frame_process(void) { RTC_TimeTypeDef rtc_time; RTC_DateTypeDef rtc_date; typedef struct { int x; int y; }POINT_T; float temp; static POINT_T ph0,ph0_bak,ph1,ph1_bak,pm0,pm0_bak, pm1,pm1_bak, ps0,ps0_bak, ps1,ps1_bak; int second_bak = 0; int minute_bak = 0; int hour_bak = 0; int year_bak = 0; int month_bak = 0; int date_bak = 0; int week_bak = 0; char buffer[10]; GUI_CURSOR_Show(); WM_SetCreateFlags(WM_CF_MEMDEV); GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbwindow, WM_HBKWIN, 0, 0); WM_SetCallback(WM_HBKWIN, NULL); add_widget(); WM_SetCallback(WM_HBKWIN, &_cbDialog); while(1){ RTC_GetTime(RTC_Format_BIN,&rtc_time);//»ñÈ¡RTCʱ¼ä RTC_GetDate(RTC_Format_BIN,&rtc_date);//»ñÈ¡RTCÈÕÆÚ if(second_bak != rtc_time.RTC_Seconds){ sprintf(buffer,"%02d",rtc_time.RTC_Seconds); TEXT_SetText(h_text_4, buffer); second_bak = rtc_time.RTC_Seconds; } if(minute_bak != rtc_time.RTC_Minutes){ sprintf(buffer,"%02d",rtc_time.RTC_Minutes); TEXT_SetText(h_text_3, buffer); minute_bak = rtc_time.RTC_Minutes; } if(hour_bak != rtc_time.RTC_Hours){ sprintf(buffer,"%02d",rtc_time.RTC_Hours); TEXT_SetText(h_text_2, buffer); hour_bak = rtc_time.RTC_Hours; } if(year_bak != rtc_time.RTC_Seconds){ sprintf(buffer,"20%02d",rtc_date.RTC_Year); TEXT_SetText(h_text_5, buffer); year_bak = rtc_date.RTC_Year; } if(month_bak != rtc_date.RTC_Month){ sprintf(buffer,"%02d",rtc_date.RTC_Month); TEXT_SetText(h_text_6, buffer); month_bak = rtc_date.RTC_Month; } if(date_bak != rtc_date.RTC_Date){ sprintf(buffer,"%02d",rtc_date.RTC_Date); TEXT_SetText(h_text_7, buffer); date_bak = rtc_date.RTC_Date; } if(week_bak != rtc_date.RTC_WeekDay){ switch(rtc_date.RTC_WeekDay){ case 1: TEXT_SetText(h_text_8, "ÐÇ ÆÚ Ò»"); break; case 2: TEXT_SetText(h_text_8, "ÐÇ ÆÚ ¶þ"); break; case 3: TEXT_SetText(h_text_8, "ÐÇ ÆÚ Èý"); break; case 4: TEXT_SetText(h_text_8, "ÐÇ ÆÚ ËÄ"); break; case 5: TEXT_SetText(h_text_8, "ÐÇ ÆÚ Îå"); break; case 6: TEXT_SetText(h_text_8, "ÐÇ ÆÚ Áù"); break; case 7: TEXT_SetText(h_text_8, "ÐÇ ÆÚ ÈÕ"); break; default: break; } week_bak = rtc_date.RTC_WeekDay; } //¸üÐÂÖ¸ÕëλÖà temp = ((rtc_time.RTC_Hours + rtc_time.RTC_Minutes / 60.) / 12.)* 2 * PI; ph0.x = 26 * sin(temp); ph0.y = 26 * cos(temp); ph1.x = 5 * sin(temp); ph1.y = 5 * cos(temp); temp = (rtc_time.RTC_Minutes / 60.) * 2 * PI; pm0.x = 36 * sin(temp); pm0.y = 36 * cos(temp); pm1.x = 5 * sin(temp); pm1.y = 5 * cos(temp); temp = (rtc_time.RTC_Seconds / 60.) * 2 * PI; ps0.x = 50 * sin(temp); ps0.y = 50 * cos(temp); ps1.x = 5 * sin(temp); ps1.y = 5 * cos(temp); //ÃëÕëÏÔʾ if(ps0.x != ps0_bak.x || ps0.y != ps0_bak.y){ GUI_SetPenSize(1); GUI_SetColor(GUI_BLACK); GUI_DrawLine(tx(ps0_bak.x,60), ty(ps0_bak.y,110), tx(ps1_bak.x,60), ty(ps1_bak.y,110)); GUI_SetColor(GUI_WHITE); GUI_SetFont(GUI_FONT_20B_ASCII); GUI_DispStringAt("12",50,60); GUI_DispStringAt("3",99,102); GUI_DispStringAt("9",11,102); GUI_DispStringAt("6",56,142); GUI_SetPenSize(3); GUI_SetColor(GUI_WHITE); GUI_DrawLine(tx(pm0.x,60), ty(pm0.y,110), tx(pm1.x,60), ty(pm1.y,110)); GUI_SetPenSize(3); GUI_SetColor(GUI_WHITE); GUI_DrawLine(tx(ph0.x,60), ty(ph0.y,110), tx(ph1.x,60), ty(ph1.y,110)); GUI_SetPenSize(1); GUI_SetColor(GUI_RED); GUI_DrawLine(tx(ps0.x,60), ty(ps0.y,110), tx(ps1.x,60), ty(ps1.y,110)); } //·ÖÕëÏÔʾ if(pm0.x != pm0_bak.x || pm0.y != pm0_bak.y){ GUI_SetPenSize(3); GUI_SetColor(GUI_BLACK); GUI_DrawLine(tx(pm0_bak.x,60), ty(pm0_bak.y,110), tx(pm1_bak.x,60), ty(pm1_bak.y,110)); GUI_SetPenSize(3); GUI_SetColor(GUI_WHITE); GUI_DrawLine(tx(pm0.x,60), ty(pm0.y,110), tx(pm1.x,60), ty(pm1.y,110)); } //ʱÕëÏÔʾ if(ph0.x != ph0_bak.x || ph0.y != ph0_bak.y){ GUI_SetPenSize(3); GUI_SetColor(GUI_BLACK); GUI_DrawLine(tx(ph0_bak.x,60), ty(ph0_bak.y,110), tx(ph1_bak.x,60), ty(ph1_bak.y,110)); GUI_SetPenSize(3); GUI_SetColor(GUI_WHITE); GUI_DrawLine(tx(ph0.x,60), ty(ph0.y,110), tx(ph1.x,60), ty(ph1.y,110)); } GUI_SetColor(GUI_WHITE); GUI_DrawCircle(tx(0,60), ty(0,110), 3); GUI_DrawCircle(tx(0,60), ty(0,110), 4); ps0_bak.x = ps0.x; ps0_bak.y = ps0.y; ps1_bak.x = ps1.x; ps1_bak.y = ps1.y; pm0_bak.x = pm0.x; pm0_bak.y = pm0.y; pm1_bak.x = pm1.x; pm1_bak.y = pm1.y; ph0_bak.x = ph0.x; ph0_bak.y = ph0.y; ph1_bak.x = ph1.x; ph1_bak.y = ph1.y; GUI_Exec(); } }