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實(shí)時(shí)時(shí)鐘（RTC）的主要功能是在系統掉電的情況下，利用后備電源使時(shí)鐘繼續運行，從而不會(huì )丟失時(shí)間信息。 s3c2440內部集成了RTC模塊，而且用起來(lái)也十分簡(jiǎn)單。其內部的寄存器BCDSEC，BCDMIN，BCDHOUR，BCDDAY，BCDDATE，BCDMON和BCDYEAR分別存儲了當前的秒，分，小時(shí)，星期，日，月和年，表示時(shí)間的數值都是BCD碼。這些寄存器的內容可讀可寫(xiě)，并且只有在寄存器RTCCON的第0位為1時(shí)才能進(jìn)行讀寫(xiě)操作。為了防止誤操作，當不進(jìn)行讀寫(xiě)時(shí)，要把該位清零。當讀取這些寄存器時(shí)，能夠獲知當前的時(shí)間；當寫(xiě)入這些寄存器時(shí)，能夠改變當前的時(shí)間。另外需要注意的是，因為有所謂的“一秒誤差”，因此當讀取到的秒為0時(shí)，需要重新再讀取一遍這些寄存器的內容，才能保證時(shí)間的正確。 下面是一個(gè)程序，可以在LCD上顯示當前時(shí)間，如果按下按鍵，中斷產(chǎn)生，會(huì )更新LCD上的時(shí)間。如果不通過(guò)按鍵，直接刷屏，會(huì )造成閃爍。 #include "Font_Libs.h" #include "2440addr.h" #define _ISR_STARTADDRESS 0x33ffff00 #define pISR_EINT0 (*(unsigned *)(_ISR_STARTADDRESS+0x20)) //垂直同步信號的脈寬、后肩和前肩 #define VSPW 15 #define VBPD 3 #define VFPD 5 //水平同步信號的脈寬、后肩和前肩 #define HSPW 8 #define HBPD 58 #define HFPD 15 #define CLKVAL 10 #define HOZVAL 319 #define LINEVAL 239 #define PWREN 1 #define MMODE 0 #define PNRMODE 3 #define BPPMODE 13 #define INVVCLK 0 #define INVVD 0 #define INVVDEN 0 #define U32 unsigned int #define M5D(n) ((n) & 0x1fffff) #define PAGEWIDTH 320 #define OFFSIZE 0 #define LCD_XSIZE 320 #define LCD_YSIZE 240 #define SCR_XSIZE 320 #define SCR_YSIZE 240 #define INVVLINE 1 #define INVVFRAME 1 #define BPP24BL 0 #define BSWP 0 #define HWSWP 0 volatile U32 LCD_BUFFER[240][320]; unsigned char data_buffer[7] = {5*16+1,1*16+7,1*16+9,2*16+6,7,1*16+2,1*16+0}; unsigned char *temp; unsigned char str0[] = "當前時(shí)間為"; unsigned char str1[] = "年"; unsigned char str2[] = "月"; unsigned char str3[] = "日"; unsigned char str[][7] = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"}; U32 flag; void Init_LCD(){ rLCDCON1=(CLKVAL＜＜8)|(MMODE＜＜7)|(PNRMODE＜＜5)|(BPPMODE＜＜1)|0; //設置CLKVAL，VCLK=HCLK/[(CLKVAL+1)*2],決定VM的觸發(fā)方式，選擇顯示模式和BPP模式，暫時(shí)不要開(kāi)啟LCD，因為還沒(méi)有設置好 rLCDCON2=(VBPD＜＜24)|(LINEVAL＜＜14)|(VFPD＜＜6)|(VSPW); //rLCDCON2，rLCDCON3和rLCDCON4主要設置時(shí)序 rLCDCON3=(HBPD＜＜19)|(HOZVAL＜＜8)|(HFPD); rLCDCON4=(HSPW); rLCDCON5 = (BPP24BL＜＜12) | (INVVCLK＜＜10) | (INVVLINE＜＜9) | (INVVFRAME＜＜8) | (0＜＜7) | (INVVDEN＜＜6) | (PWREN＜＜3) |(BSWP＜＜1) | (HWSWP); //INVVLINE和INVVFRAME需要進(jìn)行翻轉，因為CPU發(fā)出的是正脈沖，LCD使用的是負脈沖，所以要改變極性，PWREN使能電源信號 rLCDSADDR1=(((U32)LCD_BUFFER＞＞22)＜＜21)|M5D((U32)LCD_BUFFER＞＞1); rLCDSADDR2=M5D(((U32)LCD_BUFFER+(SCR_XSIZE*SCR_YSIZE*4))＞＞1 ); rLCDSADDR3=PAGEWIDTH*32/16; rLCDINTMSK|=(3); rTCONSEL = 0; rGPCUP = 0x0; rGPDCON = 0xaaaaaaaa; rGPCCON = 0xaaaa02a9; rGPDUP = 0x0; rGPGUP=rGPGUP&("(1＜＜4))|(1＜＜4); rGPGCON=rGPGCON&("(3＜＜8))|(3＜＜8); rLCDCON1 |= 1; //使能數據輸出和LCD控制信號 } void Paint_background(U32 c, U32 startx, U32 starty, U32 endx, U32 endy){ U32 i,j; for(j = starty; j ＜ endy; j++) for(i = startx; i ＜ endx; i++) LCD_BUFFER[j][ i] = c; } void SetTime(){ rRTCCON |= 0x1; rBCDSEC = data_buffer[0]; rBCDMIN = data_buffer[1]; rBCDHOUR = data_buffer[2]; rBCDDATE = data_buffer[3]; rBCDDAY = data_buffer[4]; rBCDMON = data_buffer[5]; rBCDYEAR = data_buffer[6]; rRTCCON &= 0xfe; } void GetTime(){ rRTCCON |= 0x1; data_buffer[0] = rBCDSEC; data_buffer[1] = rBCDMIN; data_buffer[2] = rBCDHOUR; data_buffer[3] = rBCDDATE; data_buffer[4] = rBCDDAY; data_buffer[5] = rBCDMON; data_buffer[6] = rBCDYEAR; rRTCCON &= 0xfe; if(data_buffer[0] == 0){ rRTCCON |= 0x1; data_buffer[0] = rBCDSEC; data_buffer[1] = rBCDMIN; data_buffer[2] = rBCDHOUR; data_buffer[3] = rBCDDATE; data_buffer[4] = rBCDDAY; data_buffer[5] = rBCDMON; data_buffer[6] = rBCDYEAR; rRTCCON &= 0xfe; } } void Paint_text(U32 x, U32 y, U32 color, unsigned char ch[]){ int i, j, test,t = 0; for(i = 0; i ＜ 16; i++){ test = 0x80; for(j = 0; j ＜ 16; j++){ if(j == 8){ test = 0x80; t++; } if(ch[t] & test) LCD_BUFFER[x+i][y+j] = color; test ＞＞= 1; } t++; } } void Paint_Ascii(U32 x, U32 y, U32 color, unsigned char ch[]){ int i, j, test; for(i = 0; i ＜ 16; i++){ test = 0x80; for(j = 0; j ＜ 8; j++){ if(test & ch[ i]) LCD_BUFFER[x+i][y+j] = color; test ＞＞= 1; } } } //2010年12月26日星期日19:17:51 void ShowTime(){ U32 qh, wh; unsigned char s0,s1; int i, t, k; char h, l; GetTime(); //當前時(shí)間為 for(i = 0,t = 0, k = 0; i ＜ 5; i++){ s0 = str0[t]; s1 = str0[t+1]; qh = s0-0xa0; wh = s1-0xa0; temp = & __HZK[((qh-1)*94+wh-1)*32]; Paint_text(100,k,0x0,temp); t = t + 2; k += 16; } //: temp = &__ASCII[':'*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //20 temp = &__ASCII['2'*16]; Paint_Ascii(100,k,0x0,temp); k+=8; temp = &__ASCII['0'*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //10 h = (data_buffer[6]＞＞4)+48; temp = &__ASCII[h*16]; Paint_Ascii(100,k,0x0,temp); k+=8; l = (data_buffer[6]&0x0f)+48; temp = &__ASCII[l*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //年 qh = str1[0]-0xa0; wh = str1[1]-0xa0; temp = & __HZK[((qh-1)*94+wh-1)*32]; Paint_text(100,k,0x0,temp); k+=16; //12 h = (data_buffer[5]＞＞4)+48; temp = &__ASCII[h*16]; Paint_Ascii(100,k,0x0,temp); k+=8; l = (data_buffer[5]&0xf)+48; temp = &__ASCII[l*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //月 qh = str2[0]-0xa0; wh = str2[1]-0xa0; temp = & __HZK[((qh-1)*94+wh-1)*32]; Paint_text(100,k,0x0,temp); k+=16; //26 h = (data_buffer[3]＞＞4)+48; temp = &__ASCII[h*16]; Paint_Ascii(100,k,0x0,temp); k+=8; l = (data_buffer[3]&0xf)+48; temp = &__ASCII[l*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //日 qh = str3[0]-0xa0; wh = str3[1]-0xa0; temp = & __HZK[((qh-1)*94+wh-1)*32]; Paint_text(100,k,0x0,temp); k+=16; //星期日 for(i = 0,t = 0; i ＜ 3; i++){ s0 = str[0][t]; s1 = str[0][t+1]; qh = s0-0xa0; wh = s1-0xa0; temp = & __HZK[((qh-1)*94+wh-1)*32]; Paint_text(100,k,0x0,temp); t = t + 2; k += 16; } //19:17:51 //19 h = (data_buffer[2]＞＞4)+48; temp = &__ASCII[h*16]; Paint_Ascii(100,k,0x0,temp); k+=8; l = (data_buffer[2]&0xf)+48; temp = &__ASCII[l*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //: temp = &__ASCII[':'*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //17 h = (data_buffer[1]＞＞4)+48; temp = &__ASCII[h*16]; Paint_Ascii(100,k,0x0,temp); k+=8; l = (data_buffer[1]&0xf)+48; temp = &__ASCII[l*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //: temp = &__ASCII[':'*16]; Paint_Ascii(100,k,0x0,temp); k+=8; //51 h = (data_buffer[0]＞＞4)+48; temp = &__ASCII[h*16]; Paint_Ascii(100,k,0x0,temp); k+=8; l = (data_buffer[0]&0xf)+48; temp = &__ASCII[l*16]; Paint_Ascii(100,k,0x0,temp); k+=8; } void __irq Key_ISR(void){ rSRCPND |= 1; //SRCPND 通過(guò)寫(xiě)入數據清零，如果不清零，會(huì )反復進(jìn)行請求 rINTPND |= 1; //INDPND 通過(guò)置1清零 flag = 1; } int Main(){ flag = 0; rGPFCON &= 0xfffc; //0 rGPFCON |= 1＜＜1; rGPFUP = 0xfe; rSRCPND |= 1＜＜0; rINTPND |= 1＜＜0; rINTMSK &= "(0x1＜＜0); //開(kāi)中斷 pISR_EINT0 = (U32)Key_ISR; Init_LCD(); Paint_background(0xffffff,0,0,320,240); SetTime(); ShowTime(); while(1){ if(flag){ Paint_background(0xffffff,0,0,320,240); ShowTime(); flag = 0; } } } 李萬(wàn)鵬 |
