ATmega16的max197程序，模拟时序读写，发光二极管显示，晶振12MHz

#include<iom16v.h> #include<macros.h> //#include"lm1602.h" #include"delay.h" #pragma interrupt_handler max197:2 //端口定义，PC口为数据口 #define MAX197_CS 7 #define MAX197_WR 6 #define MAX197_RD 5 #define MAX197_HBEN 4 uchar flag; void int0_init(void) { SREG|=BIT(7); MCUCR=0; GICR|=BIT(6); } uint read_max197(uchar aa) { uchar temph,templ; uint temp; DDRD=0xf0;//外部中断必须设置为输入状态，PD2口为中断口 DDRA=0xff; PORTD=0xff; PORTD&=~BIT(MAX197_CS); NOP(); PORTD&=~BIT(MAX197_WR); NOP(); PORTA=0x40+aa; NOP(); PORTD|=BIT(MAX197_WR); NOP(); PORTD|=BIT(MAX197_RD); flag=0; while(!flag); delays(30); PORTA=0xff; DDRA=0x00; PORTD&=~BIT(MAX197_CS); PORTD|=BIT(MAX197_HBEN); PORTD&=~BIT(MAX197_RD); NOP(); NOP(); temph=PINA; PORTD&=~BIT(MAX197_HBEN); NOP(); NOP(); templ=PINA; PORTD|=BIT(MAX197_RD); PORTD|=BIT(MAX197_CS); temp=(temph<<8)+templ; return temp; } void main(void) { //SREG|=BIT(7); uint voltage; float dianya; uchar shi,ge; //lcdinit(); int0_init(); DDRB=0xff; while(1) { voltage=read_max197(0x00); dianya=voltage/4096.0*500; voltage=dianya+5; shi=voltage/100; ge=voltage%100/10; PORTB=(shi<<4)+ge;//必须加括号 /*dianya=voltage/4096.0*5000; voltage=dianya+0.5; IntToStr(voltage,buffer,4); setPosition(0,2); printc(buffer[0]); printc('.'); printc(buffer[1]); printc(buffer[2]); printc(buffer[3]); printc('V'); setPosition(1,2); prints("successful");*/ delayl(500); } } void max197(void) { flag=1; }