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楼主 |
发表于 2011-7-11 10:35:11
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对不起，millwood老师，先把你的程序整理一下，因为在0124x768显示单注释行被分为两行，或者直接用/* */好点
//time keeping on 8051
//tmr0 runs as a 16-bit rtc (black roman approach)
//tmr1 controls the 7-segment display
#include<regx51.h> //we use keil c51
#include "gpio.h"
#include <intrins.h>
//hardware configuration
#define _7SEG_PORT P2 //7seg connection, active low
#define _7SEG_DDR P2
#define _7SEGs 0xff
#define _7SEG_OFF(segs) {_7SEG_PORT= (segs);} //turn on segments, active low
#define _7SEG_ON(segs) {_7SEG_PORT=~(segs);} //turn off segments
#define DIG_PORT P3 //digits connection, active high
#define DIG_DDR P3
#define DIGs 0xff
#define DIG_ON(digs) {DIG_PORT= (digs);} //turn on digs, active high
#define DIG_OFF(digs) {DIG_PORT=~(digs);} //turn off digs
#define HALF_SEC (500000ul) //half a second, in us
#define FULL_SEC (2*HALF_SEC) //a full second, in us
#define TMR0_PERIOD HALF_SEC //tmr0's period
#define TMR1_PERIOD 1000ul //tmr1's period
#define TMR0_ERROR 0 //tmr0 error term
//end hardware configuration
#define F_CPU 2000000ul //cpu frequency, in hz
#define DLY_MS 100 //delay cycles to achieve 1ms at 1MIPS
#define MSB(word_t) ((word_t) >> 8) //word_t's most significant byte
#define LSB(word_t) ((word_t) & 0x00ff) //word_t's least significant byte
typedef struct {
unsigned char half_sec; //half second
unsigned char sec; //second
unsigned char fen; //minute
unsigned char shi; //hour
} _time_type;
//global variables
unsigned long _time_counter=0; //time counter, in timer ticks
unsigned short _tmr1_period; //tmr1 period
_time_type _time={ //time for time keeping
0, 59, 59, 23}; //23:59:59:0
unsigned char vRAM[8]; //display buffer
unsigned char disp_on_off,disp,i,sec1,sec,fen,shi;
//sbit =P2;
//unsigned int count;
sbit k1=P1^0; //??,???? ???????
void delay(unsigned char dly) {
while (dly--) continue;
}
void delay_ms(unsigned char ms) //????
{
//unsigned char i,k;
while (ms--)
delay(DLY_MS * (F_CPU / 1000000ul));
}
/****************??0??***************/
void tmr0_init(void)
{
TR0=0; //stop tmr0
TMOD= (TMOD & 0xf0) | 0x01; //reset tmod's lower 4 bits
//tmr0 running in mode 1 (16-bit timer), not gated
TH0=0; //reset tmr0
TL0=0;
ET0=1; //enable tmr0 interrupt
// EA=1;
TR0=1;
}
//update time
void update_time(_time_type * time) {
_time_counter+=0x10000ul+TMR0_ERROR; //increment time_counter;
//need to make sure that it doesn't overflow at high f_cpu
if (_time_counter >= (TMR0_PERIOD * (F_CPU / 1000000ul))) {
//IO_FLP(P1, 1<<1); //for testing only
_time_counter -= (TMR0_PERIOD * (F_CPU / 1000000ul)); //reset _time_counter
time->half_sec+=1; //increment half second
if(time->half_sec==2) //full second reached?
{
time->half_sec=0; //reset half second indicator
time->sec+=1; //increment the second
if(time->sec==60) //full 60 seconds passed?
{
time->sec=0; //reset the second
time->fen+=1; //increment the minute
if(time->fen==60) //full 60 minutes passed?
{
time->fen=0; //reset the minute
time->shi+=1; //increment the hour
if(time->shi==24) //full 24 hour passed?
{
time->shi=0; //reset the hour
}
vRAM[5]=0x10; //update hour display
vRAM[6]=time->shi%10;
vRAM[7]=time->shi/10;
}
vRAM[3]=time->fen%10; //update minute display
vRAM[4]=time->fen/10;
}
vRAM[0]=time->sec%10; //??????? //update second display
vRAM[1]=time->sec/10;
}
vRAM[2]=(time->half_sec)?0x10:0x7f; //???? - blinking
}
}
/****************??0??*************/
void tmr0_isr(void) interrupt TF0_VECTOR
{
update_time(&_time); //update time keeping
}
//initialize the display
void _7seg_init(void) {
_7SEG_OFF(_7SEGs); //clear leds - turn off all segments
IO_OUT(_7SEG_DDR, _7SEGs); //leds as output
DIG_OFF(DIGs); //all display off
IO_OUT(DIG_DDR, DIGs); //all digit pins as output
//initialize vRAM
vRAM[5]=0x10; //update hour display
vRAM[6]=_time.shi%10;
vRAM[7]=_time.shi/10;
vRAM[3]=_time.fen%10; //update minute display
vRAM[4]=_time.fen/10;
vRAM[0]=_time.sec%10; //??????? //update second display
vRAM[1]=_time.sec/10;
vRAM[2]=(_time.half_sec)?0x10:0x7f; //???? - blinking the half second indicator
}
//display the content of vRAM[8]
void _7seg_display(void) {
unsigned char code _7seg_font[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40};//???????
//unsigned char _7seg_font[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; //???????????
static unsigned char digit=0; //digit to be displayed
DIG_OFF(DIGs); //turn all digits off
_7SEG_ON(_7seg_font[vRAM[digit]]); //display the digit
DIG_ON(1<<digit); //turn on the digit
digit+=1; //increment the digit
if (digit==8) digit=0; //reset the digit
}
/****************??1??***************/
void tmr1_init(unsigned short period)
{
_tmr1_period=period; //save tmr1_period
TR1=0; //stop tmr1
TMOD= (TMOD & 0x0f) | 0x10; //reset tmod's higher 4 bits
//tmr1 running in mode 1 (16-bit timer), not gated
TH1=MSB(-_tmr1_period); //load up the offset
TL1=LSB(-_tmr1_period);
ET1=1;
//EA=1;
TR1=1;
}
/***************??1????***********/
void tmr1_isr(void) interrupt TF1_VECTOR
{
//IO_FLP(P1, 1<<2); //for testing only
TH1+=MSB(-_tmr1_period); //load up the offset
TL1+=LSB(-_tmr1_period); //load up the offset
_7seg_display(); //display
}
void mcu_init(void) {
}
void main(void) //???
{
//shi=12;
//fen=12;
//P0=0xff;
//disp_on_off=0xfe; //?????
//disp=0;
mcu_init(); //reset the mcu
_7seg_init(); //reset the 7seg display
tmr0_init(); //reset tmr0 - period set by TMR0_PERIOD
tmr1_init(TMR1_PERIOD * (F_CPU / 1000000ul)); //reset tmr1
EA=1; //enable global interrupt
while(1)
{
//delay();
}
} |
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发表于 2011-7-11 09:25:08
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