mega128例程

1、流水灯/*硬件环境：atmega128开发板软件环境：CodeVisionA VR-C*/#include <mega128.h>#define uchar unsigned char#define uint unsigned intuchar cnt;void timer1_init(){TCCR1B=0X00; //先停止定时器1TCNT1H=0XF0; //设定定时器初值TCNT1L=0XBE;TCCR1A=0X00; //启动定时器1TCCR1B=0X05; //使用1024分频}interrupt [TIM1_OVF] void timer1_ovf_isr(void){TCNT1H=0XF0; //重载定时器初值TCNT1L=0XBE;DDRE|=1<<2;PORTE|=1<<2;DDRA=0xff;PORTA=cnt; //输出led的值到端口Bcnt++;if(cnt==255)cnt=0;}void main(){//DDRB=0XFF;SREG|=0X80;TIMSK=0X04;timer1_init();while(1){;}}2、AD转换+数码管显示/***************************************************************************//*ADC测试程序*//*目标器件：ATmega128 *//*晶振:RC 8MHZ *//*编译环境：ICCA VR 7.13A *//*E-Mail:number007cool@ *//*时间：2010年11月13日*///Aref接A VCC(+5V),采用Aref作参考电压/*用数码管显示AD转换的结果*//***************************************************************************//*********************************包含头文件********************************/#include <iom128v.h>#include <macros.h>/********************************数码管段码表*******************************/ extern const unsigned char tab[]={0x3f,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};/*********************************全局变量**********************************/ unsigned int adc_rel=0;/****************************************************************************函数功能:ADC初始化函数入口参数:出口参数:****************************************************************************/ void adc_init(void){DDRF&=0XFE; //PORTF0设置为输入，即作为ADC0口输入模拟电压PORTF&=0XFE; //PORTF0设置为输入低电平ADCSRA=0x00; //关ADCADMUX = 0X00; //采用Aref作为参考电压，ADC0单端输入，右对齐ACSR=(1<<ACD);ADCSRA = (1<<ADEN)|(1<<ADSC)|(1<<ADATE)|(1<<ADIE)|(1<<ADPS2)|(1<<ADPS1);//ADEN，启动ADC;ADSC,ADC开始转换；ADIE,ADC中断使能；ADPSx,设置分频因子64 }/****************************************************************************函数功能:ADC中断函数入口参数:出口参数:****************************************************************************/#pragma interrupt_handler adc_isr:iv_ADCvoid adc_isr(void){//int data_h,data_l;//data_l=ADCL;//data_h=ADCH;ADCSRA = 0x00;ADCSRA = (1<<ADEN)|(1<<ADSC)|(1<<ADIE);adc_rel=ADC;/*if(adc_rel>0x1ff){PORTA|=1<<2;}elsePORTA&=~(1<<2);*/}/**************************************************************************** 函数功能:延时子程序入口参数:出口参数:****************************************************************************/ void delay(void){int i;for(i=0;i<1800;i++);}/**************************************************************************** 函数功能:显示子程序入口参数:k出口参数:****************************************************************************/ void display(unsigned int k)//发光二极管显示初始化{DDRE|=1<<2;PORTE|=1<<2;DDRA=0XFF;PORTA=k;}#define SS 0#define SCK 1#define MOSI 2#define MISO 3#define SS_H() PORTB|=(1<<SS)#define SS_L() PORTB&=~(1<<SS)#define led0_en() {DDRB|=1<<4;PORTB|=(1<<4);} //开第一个数码管的位选#define led0_dis() {DDRB|=1<<4;PORTB&=~(1<<4);} //关第一个数码管的位选#define led1_en() {DDRB|=1<<5;PORTB|=(1<<5);}#define led1_dis() {DDRB|=1<<5;PORTB&=~(1<<5);}#define led2_en() {DDRB|=1<<6;PORTB|=(1<<6);}#define led2_dis() {DDRB|=1<<6;PORTB&=~(1<<6);}#define led3_en() {DDRB|=1<<7;PORTB|=(1<<7);}#define led3_dis() {DDRB|=1<<7;PORTB&=~(1<<7);}#define OE 7#define point 3#define dp 7#include <iom128v.h>#include <macros.h>const unsigned char table[]={0x3F,0x06,0x5B,0x4F,0x66, //0,1,2,3,40x6D,0x7D,0x07,0x7F,0x6F, //5,6,7,8,90x77,0x7C,0x39,0x5E,0x79,0x71,0x00}; //a,b,c,d,e,fvolatile unsigned char led_buffer[4];void delay_1us(void) //1us延时函数{asm("nop");}void delay_nus(unsigned int n) //N us延时函数{unsigned int i=0;for (i=0;i<n;i++)delay_1us();}void delay_1ms(void) //1ms延时函数{unsigned int i;for (i=0;i<1140;i++);}void delay_nms(unsigned int n) //N ms延时函数{unsigned int i=0;for (i=0;i<n;i++)delay_1ms();}/*完成spi的初始化*/void spi_init(void){DDRB |= (1<<MOSI)|(1<<SCK)|(1<<SS);//设置MOSI，SCK输出SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0)|(1<<SPR1);//使能SPI，主机模式}/*spi主机传送数据*/void SPI_MasterTransmit(char Data){/* 启动数据传输*/SPDR = Data;/* 等待传输结束*/while(!(SPSR & (1<<SPIF)));}/*完成对HC595的初始化*/void HC_595_init(void){DDRC |= (1<<OE); //设置PORTC7为输出PORTC &= (1<<OE); //输出高电平，使能595 PORTB = 0x0F; //同时打开四个数码管的位选 spi_init();led_buffer[0]=16; //初始化数码管段码led_buffer[1]=16;led_buffer[2]=16;led_buffer[3]=16;}/*HC595完成传送数据*/void HC_595_OUT(unsigned char data){SS_L();SPI_MasterTransmit(data);SS_H();}void leddis_update(void){/*最低位数码管，第四个数码管*/if(point==0)HC_595_OUT(table[led_buffer[3]]|(1<<dp)); elseHC_595_OUT(table[led_buffer[3]]);led0_en();delay_nus(60);led0_dis();if(point==1)HC_595_OUT(table[led_buffer[2]]|(1<<dp)); elseHC_595_OUT(table[led_buffer[2]]);led1_en();delay_nus(60);led1_dis();if(point==2)HC_595_OUT(table[led_buffer[1]]|(1<<dp));elseHC_595_OUT(table[led_buffer[1]]);led2_en();delay_nus(60);led2_dis();/*最高位数码管，第一个数码管*/if(point==3)HC_595_OUT(table[led_buffer[0]]|(1<<dp));elseHC_595_OUT(table[led_buffer[0]]);led3_en();delay_nus(60);led3_dis();}void display_led(unsigned int data){if(data>9999){HC_595_OUT(0xFF);//当计数大于9999时，四个数码管同时输出8 PORTB|=((1<<4)|(1<<5)|(1<<6)|(1<<7));}else if(data>999){led_buffer[0]=data/1000;led_buffer[1]=(data%1000)/100;led_buffer[2]=(data%100)/10;led_buffer[3]=data%10;leddis_update();}else if(data>99){led_buffer[0]=data/1000; //关闭最高位的那个数码管led_buffer[1]=(data%1000)/100;led_buffer[2]=(data%100)/10;led_buffer[3]=data%10;leddis_update();}else if(data>9){led_buffer[0]=data/1000;led_buffer[1]=16;led_buffer[2]=(data%100)/10;led_buffer[3]=data%10;leddis_update();}else{led_buffer[0]=data/1000;led_buffer[1]=16;led_buffer[2]=16;led_buffer[3]=data%10;leddis_update();}}volatile unsigned int countnum=0;void timer1_init(void){TCCR1B = 0x00; //stopTCNT1H = 0x8F; //setupTCNT1L = 0x81;OCR1AH = 0x70;OCR1AL = 0x7F;OCR1BH = 0x70;OCR1BL = 0x7F;OCR1CH = 0x70;OCR1CL = 0x7F;ICR1H = 0x70;ICR1L = 0x7F;TCCR1A = 0x00;TCCR1B = 0x04; //start Timer}#pragma interrupt_handler timer1_ovf_isr:15 void timer1_ovf_isr(void){TCNT1H = 0x8F; //reload counter high valueTCNT1L = 0x81; //reload counter low valuecountnum++;if(countnum>9999) countnum=0;}void init_devices(void){CLI(); //disable all interruptstimer1_init();TIMSK = 0x04; //timer interrupt sourcesSEI(); //re-enable interrupts}/**************************************************************************** 函数功能:主程序入口参数:出口参数:****************************************************************************/ void main(void){init_devices();HC_595_init();adc_init();SEI();//开全局中断变量display(0);while(1){delay();display_led(adc_rel/1024.0*5*1000);}}3、对EEPROM进行读写操作/************************************************文件：main.c用途：注意：内部8M晶振************************************************/#include "config.h"/*向EEPROM里面写入数据输入量：地址，数据*/void EEPROM_write(unsigned int uiAddress,unsigned char ucData){while(EECR&(1<<EEWE)); //等待上一次写操作结束EEAR = uiAddress; //地址EEDR = ucData; //数据EECR |=(1<<EEMWE); //置位EEMWE,主机写使能EECR |=(1<<EEWE); //置位EEWE,写使能，启动写操作}/*从EEPROM指定的地址里面读出相应的数据*/unsigned char EEPROM_read(unsigned int uiAddress){while(EECR&(1<<EEWE)); //等待上一次写操作结束EEAR = uiAddress; //设置地址寄存器EECR |=(1<<EERE); //读使能return EEDR; //返回读入EEDR里面的数据}void main(void){unsigned char temp=123;unsigned char data;HC_595_init();EEPROM_write(0x01,temp);data=EEPROM_read(0x01);while(1){Seg7_Led_display(data); //调用显示函数将写入的数据又读出来}}4、定时器0（轮循方式）/*定时器0和2（均为八位的定时计数器）有四种工作模式，此例是工作在普通模式。