#include<AT91SAM7S256.h>
void Write(unsigned char com,unsigned char dta);//发送带数据的命令
char read_zlg7289(unsigned char command);
void send_byte(unsigned char out_byte);//发送8位数据
volatile char temp=0xff;
char k,x,newkey,m;
long int i;
void Ctrl_IO_bit(unsigned char IO_bit,unsigned char level)
{
unsigned long int data=0x00000001;
data=data<<IO_bit;
if(level)
{
*AT91C_PIOA_ODSR =(*AT91C_PIOA_ODSR)|data;
}
else
{
data=~data;
*AT91C_PIOA_ODSR =(*AT91C_PIOA_ODSR)&data;
}
}
void delay(unsigned long int x) //延时函数
{
while(--x) ;
}
void Write(unsigned char com,unsigned char dta)//发送带数据的命令
{
Ctrl_IO_bit(21,0); //cs=0
delay(1000);
send_byte(com);
send_byte(dta);
Ctrl_IO_bit(21,1); //cs=1;
}
void io_irq_handler(void) __irq //I/O中断函数
{
newkey=0x01;
temp=read_zlg7289(0x15);
switch(temp)
{
case 0x00:
m=1;
Write(0x83,1);
break;
case 0x01:
m=2;
Write(0x83,2);
break;
case 0x02:
