/*****************************************************
This program was produced by the
CodeWizardAVR V1.24.8c Professional
Automatic Program Generator
?Copyright 1998-2006 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com
Project : M8
Version : 1.0
Date : 2006-5-5
Author : WCJ
Company : 瑞安万鑫电子
Comments:AVR(ATMEGA8) 入门学习板
Chip type : ATmega8L
Program type : Application
Clock frequency : 4.000000 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 256
*****************************************************/
// 本章简介
/****************************************************
一,学习目的:LED数码管动态显示
二,基础知识:
AVR采用3个8位寄存器控制I/O端口
方向寄存器:DDRx (可读写)
数据寄存器:PORTx (可读写)
输入引脚寄存器:PINx (只读)
* SFIOR寄存器中的上拉屏蔽位PUD为"1",则会屏蔽掉所有端口引脚中的内部上拉电阻
数码管的驱动动态显示
三,实验任务:
1.编写74HC164的驱动程序
2.在4位共阳数码管上动态显示数字
四,注意事项:
将JP1上的PC2，PC3，PC4，PC5跳针短路（数码管的位选）
将JP2上的PB3，PB5跳针短路（通过74HC164实现段码）
****************************************************/
#include <mega8.h>//包含ATMEGA8L的寄存器定义,和中断向量表
#include <delay.h>//CVAVR 自带的延时函数
//数码管的段码，低电平有效
#define DATA_164 PORTB.3//164数据脚
#define CLK_164 PORTB.5//164时钟脚
//数码管的位码，低电平有效
#define BIT4 PORTC.5//千位
#define BIT3 PORTC.4//百位
#define BIT2 PORTC.3//十位
#define BIT1 PORTC.2//个位
// BIT 7 6 5 4 3 2 1 0
/* LED段码:低电平亮 段码
数字 74HC164D输出码位:G C H D B F A E
0: 1 0 1 0 0 0 0 0 0xA0
1: 1 0 1 1 0 1 1 1 0xB7
2: 0 1 1 0 0 1 0 0 0x64
3: 0 0 1 0 0 1 0 1 0x25
4: 0 0 1 1 0 0 1 1 0x33
5: 0 0 1 0 1 0 0 1 0x29
6: 0 0 1 0 1 0 0 0 0x28
7: 1 0 1 1 0 1 0 1 0xB5
8: 0 0 1 0 0 0 0 0 0x20
9: 0 0 1 0 0 0 0 1 0x21
.: 1 1 0 1 1 1 1 1 0xDF
*/ /* 0 1 2 3 4 5 6 7 8 9 .*/
unsigned char LEDcode[11]={0xA0,0xB7,0x64,0x25,0x33,0x29,0x28,0xB5,0x20,0x21,0xDF};
unsigned char display_buf[4];//显示缓冲寄存器
//写164串行接口
//数码管的段码
void wr_164(unsigned char wr_data)
{
unsigned char i;
for(i=0;i<8;i++)
{
if((wr_data&0x80)==0x80)
{DATA_164=1;}
else
{DATA_164=0;}
CLK_164=0;
CLK_164=1;
wr_data<<=1;
}
}
void display(void)
{ //送段码，显示；延时，关闭显示
wr_164(display_buf[0]);BIT1=0;delay_ms(2);BIT1=1;
wr_164(display_buf[1]);BIT2=0;delay_ms(2);BIT2=1;
wr_164(display_buf[2]);BIT3=0;delay_ms(2);BIT3=1;
wr_164(display_buf[3]);BIT4=0;delay_ms(2);BIT4=1;
}
// Declare your global variables here
//4位数最高为9999 所以选INT类型，这里没有考虑负数
void numbertobcd(unsigned int number)
{ unsigned int i;
i=number/1000;
display_buf[0]=LEDcode[i];
number=number%1000;
i=number/100;
display_buf[1]=LEDcode[i];
number=number%100;
i=number/10;
display_buf[2]=LEDcode[i];
i=number%10;
display_buf[3]=LEDcode[i];
display();//显示数据 number
}
void main(void)
{
// Declare your local variables here
unsigned int temp=1234;//预显示的数值
// Input/Output Ports initialization
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0xff;
DDRB=0xEF;
// Port C initialization
// Func6=In Func5=Out Func4=Out Func3=Out Func2=Out Func1=In Func0=In
// State6=T State5=0 State4=0 State3=0 State2=0 State1=T State0=T
PORTC=0x00;//
DDRC=0xFF;//数码管位选
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;
PORTD.3=1;//输入上拉;
DDRD.3=0;//PORTD.3为输入方式;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
TCCR0=0x00;
TCNT0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
while (1)
{
numbertobcd(temp); //数码管显示1234 TEMP的值
};
}
