马老师，求助8279！
马老师，已经调俩星期，都没结果！我用8515做8279的扩展键盘实验，用频率发生器的PB0口做8279的时钟，cs和pc2,a0和pc0,rd,wr 数据线依次连好，用SL0,SL1和RL0,RL1接四个按键，IRQ通过反相器接INT0,意思是想通过按键动作控制PB1,PB2的外接发光二极管。8279没有外接数码管！
先是用AD数据总线，后来用一般IO口程序
程序如下：
//ICC-AVR application builder : 2007-5-22 9:20:00
// Target : M8515
// Crystal: 7.3728Mhz
#include <iom8515v.h>
#include <macros.h>
#define Ctr8279 (*(volatile char *)0x7100)
#define D8279 (*(volatile char *)0x7000)
#define unchar unsigned char
#define unint unsigned int
unchar int0_flag;
void port_init(void)
{
PORTB = 0x00;
DDRB= 0x07;
PORTD = 0x00;
DDRD= 0x00;
PORTE = 0x00;
DDRE= 0x00;
}
//TIMER0 initialize - prescale:1
// WGM: Normal
// desired value: 1MHz
// actual value:1.053MHz (5.1%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop timer
TCNT0 = 0xF9; //set count value
OCR0= 0xFE;
TCCR0 = 0x11; //start timer
}
#pragma interrupt_handler timer0_comp_isr:15
void timer0_comp_isr(void)
{
//compare
OCR0= 0xFE;
PORTB^=0X02;
}
#pragma interrupt_handler timer0_ovf_isr:8
void timer0_ovf_isr(void)
{
TCNT0 = 0xF9; //reload counter value
OCR0= 0xFE;
//PORTB^=0X01;
}
#pragma interrupt_handler int0_isr:2
void int0_isr(void)
{
//external interupt on INT0
int0_flag=1;
}
//call this routine to initialize all peripherals
void delay(void)
{
unint i;
for( i=0;i<125;i++);
}
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable al l interrupts
port_init();
timer0_init();
MCUCR = 0xC2; //引脚第二功能选择，等待状态选择 中断配置
EMCUCR = 0x04; //无等待状态
GICR = 0x40; //外部中断使能
TIMSK = 0x03;
SEI(); //re-enable interrupts
//all peripherals are now initialized
}
//void clear(void)
//{
//unchar i;
// Ctr8279=0xd1;
// i=Ctr8279;i&=0x80;
// while(i==0x80){i=Ctr8279;i&=0x80;}
//}
void init8279(void)
{
Ctr8279=0x21; //时钟配置
delay();
Ctr8279=0x01; //键盘扫描方式000 00001
delay();
}
unchar keyvalue(void)
{
Ctr8279=0x40; //读显示
delay();
return(D8279);
delay();
}
void main(void)
{
unchar keydata;
init_devices();
init8279();
delay();
do{
//Ctr8279=0xFF;
if(int0_flag)
{
PORTB^=0x02;
keydata=keyvalue();
//PORTB=keydata;
int0_flag=0;
/*switch(keydata)
{
case (0x01):
PORTB=0x01;
break;
case(0x02):
PORTB=0x02;
break;
case (0x04):
PORTB=0x04;
break;
case (0x08):
PORTB=0x00;
break;
}*/
}
else
PORTB^=0X04;
}while(1);
}
一般IO口
//ICC-AVR application builder : 2007-5-22 11:25:09
// Target : M8515
// Crystal: 7.3728Mhz
#include <iom8515v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int
#define write0 PORTD&=~BIT(PD6)
#define write1 PORTD|=BIT(PD6)
#define read0 PORTD&=~BIT(PD7)
#define read1 PORTD|=BIT(PD7)
#define cs0 PORTC&=~BIT(PC2)
#define cs1 PORTC|=BIT(PC2)
#define Anumber PORTC&=~BIT(PC0)
#define Actr PORTC|=BIT(PC0)
uchar data;
uint i;
uchar int0_flag=0;
void port_init(void)
{
PORTB = 0x04;
DDRB= 0x07;
PORTC = 0x00;
DDRC= 0xFF;
PORTD = 0x00;
DDRD= 0xFF;
}
//TIMER0 initialize - prescale:1
// WGM: Normal
// desired value: 1MHz
// actual value:1.053MHz (5.1%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop timer
TCNT0 = 0xF9; //set count value
OCR0= 0x07;
TCCR0 = 0x01; //start timer
}
#pragma interrupt_handler timer0_comp_isr:15
void timer0_comp_isr(void)
{
//compare
//OCR0= 0x07;
}
#pragma interrupt_handler timer0_ovf_isr:8
void timer0_ovf_isr(void)
{
TCNT0 = 0xF9; //reload counter value
PORTB^=0X01;
//PORTB^=0x02;
}
#pragma interrupt_handler int0_isr:2
void int0_isr(void)
{
//external interupt on INT0
int0_flag=1;
}
//call this routine to initialize all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
port_init();
timer0_init();
MCUCR = 0x02;
EMCUCR = 0x00;
GICR = 0x40;
TIMSK = 0x03;
SEI(); //re-enable interrupts
//all peripherals are now initialized
}
void init8279(void)
{
cs0;
Actr; //片选及A控制
DDRA=0xff; //A口输出
write0; //写信号有效
//NOP();
PORTA=0x22; //时钟配置
NOP();
write1; //写信号置高
NOP();
write0; //写信号有效
//NOP();
PORTA=0x01; //键盘模式，译码
NOP();
write1; //写信号置高
NOP();
cs1; //片选无效
}
uchar read(void)
{
cs0;
Actr; //片选及A控制
DDRA=0xff; //A口输出
write0; //写信号
//NOP();
PORTA=0x40; //读取命令
//NOP();
write1; //写信号置高
NOP();
Anumber; //片选及A控制
PORTA=0XFF; //上拉使能
DDRA=0x00; //A口输入
//NOP();
read0; //读信号
NOP();
return(PINA);
NOP();
read1; //读写置高
NOP();
cs1;
}
void delay(void)
{
unsigned int i;
for (i=0;i<150;i++);
}
void delay_nms(unsigned n)
{
unsigned int i;
for (i=0;i<n;i++)
delay();
}
void main()
{
init_devices();
delay_nms(500);
init8279();
do
{
if(int0_flag)
{PORTB^=0x02;
data=read();
int0_flag=0;}
else
{PORTB^=0X02;}
}while(1);
} 各位，谁熟悉8279啊？
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