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- UID
- 1023166
- 性别
- 男
- 来自
- 燕山大学
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实时时钟（RTC）的主要功能是在系统掉电的情况下，利用后备电源使时钟继续运行，从而不会丢失时间信息。
s3c2440内部集成了RTC模块，而且用起来也十分简单。其内部的寄存器BCDSEC，BCDMIN，BCDHOUR，BCDDAY，BCDDATE，BCDMON和BCDYEAR分别存储了当前的秒，分，小时，星期，日，月和年，表示时间的数值都是BCD码。这些寄存器的内容可读可写，并且只有在寄存器RTCCON的第0位为1时才能进行读写操作。为了防止误操作，当不进行读写时，要把该位清零。当读取这些寄存器时，能够获知当前的时间；当写入这些寄存器时，能够改变当前的时间。另外需要注意的是，因为有所谓的“一秒误差”，因此当读取到的秒为0时，需要重新再读取一遍这些寄存器的内容，才能保证时间的正确。
下面是一个程序，可以在LCD上显示当前时间，如果按下按键，中断产生，会更新LCD上的时间。如果不通过按键，直接刷屏，会造成闪烁。
#include "Font_Libs.h"
#include "2440addr.h"
#define _ISR_STARTADDRESS 0x33ffff00
#define pISR_EINT0 (*(unsigned *)(_ISR_STARTADDRESS+0x20))
//垂直同步信号的脉宽、后肩和前肩
#define VSPW 15
#define VBPD 3
#define VFPD 5
//水平同步信号的脉宽、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[] = "当前时间为";
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; //设置CLKVAL，VCLK=HCLK/[(CLKVAL+1)*2],决定VM的触发方式，选择显示模式和BPP模式，暂时不要开启LCD，因为还没有设置好
rLCDCON2=(VBPD＜＜24)|(LINEVAL＜＜14)|(VFPD＜＜6)|(VSPW); //rLCDCON2，rLCDCON3和rLCDCON4主要设置时序
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需要进行翻转，因为CPU发出的是正脉冲，LCD使用的是负脉冲，所以要改变极性，PWREN使能电源信号
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; //使能数据输出和LCD控制信号
}
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();
//当前时间为
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 通过写入数据清零，如果不清零，会反复进行请求
rINTPND |= 1; //INDPND 通过置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); //开中断
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;
}
}
} |
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