如何使用DAC7760的帧错误检查

在CISCO的部分交换机上可以输入以下命令查看耐卖局端口数据帧错误统计昌让:show int counters errors然后会显示交换机各端口的配卖错误数。。想知道当这个数值达到多少的时候需要特别关注。。。谢谢!!!

sbit wr=P3^6

sbit rd=P3^2

sbit k0=P1^0

sbit k1=P1^1

sbit k2=P1^2

sbit k3=P1^3

sbit k4=P1^4

unsigned char flag/判扮/当flag为0、1、2、3、4时分别掘让灶产生正弦波、方波、三角波、梯形波、锯齿波

unsigned char const code sin_code[256]={

0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c,0x9f,0xa2,

0xa5,0xa8,0xab,0xae,0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,

0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,0xda,0xdc,0xde,0xe0,

0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf4,

0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfe,0xfe,0xff,

0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,

0xfd,0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf3,0xf2,

0xf0,0xef,0xed,0xec,0xea,0xe8,0xe6,0xe4,0xe3,0xe1,0xde,0xdc,

0xda,0xd8,0xd6,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,

0xbc,0xb9,0xb6,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,

0x99,0x96,0x92,0x8f,0x8c,0x89,0x86,0x83,0x80,0x7d,0x79,0x76,

0x73,0x70,0x6d,0x6a,0x67,0x64,0x61,0x5e,0x5b,0x58,0x55,0x52,

0x4f,0x4c,0x49,0x46,0x43,0x41,0x3e,0x3b,0x39,0x36,0x33,0x31,

0x2e,0x2c,0x2a,0x27,0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,

0x15,0x14,0x12,0x10,0xf,0xd,0xc,0xb,0x9,0x8,0x7,0x6,0x5,0x4,

0x3,0x3,0x2,0x1,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,

0x0,0x1,0x1,0x2,0x3,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xc,0xd,

0xe,0x10,0x12,0x13,0x15,0x17,0x18,0x1a,0x1c,0x1e,0x20,0x23,

0x25,0x27,0x29,0x2c,0x2e,0x30,0x33,0x35,0x38,0x3b,0x3d,0x40,

0x43,0x46,0x48,0x4b,0x4e,0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,

0x66,0x69,0x6c,0x6f,0x73,0x76,0x79,0x7c

}//用于生成正弦

unsigned char kscan() //键盘扫描函数

{

unsigned char kscannum,t

P1=0xff

t=P1

if(~(t&0xff))

{

if(k0==0)

{

kscannum=1

}

else if(k1==0)

{

kscannum=2

}

else if(k2==0)

{

kscannum=3

}

else if(k3==0)

{

kscannum=4

}

else if(k4==0)

{

kscannum=5

}

else

{

kscannum=0

}

return kscannum

}

}

void init_DA0832()//DA0832初始化

{

rd=0

wr=0

}

void fangbo()//产生方波函数

{

EA=1//开总中断

ET0=1//计时器T0工作

TMOD=1

TR0=1/滑腔/开启T0

TH0=0xff//装入初值

TL0=0x83

}

void sin()//产生正弦波函数

{

unsigned inti

do{

P2=sin_code[i]

i=i+1

}while(i<256)

}

void juchibo()//产生锯齿波函数

{

P2=0x00

do{

P2=P2+1

}while(P2<=0xff)

}

void sanjiaobo()//产生三角波函数

{

P2=0x00

do{

P2=P2+1

}while(P2<0xff)

P2=0xff

do{

P2=P2-1

}while(P2>0x00)

P2=0x00

}

void tixingbo()//产生梯形波函数

{

unsigned char i

P2=0x00

do{

P2=P2+1

}while(P2<0xff)

P2=0xff

for(i=255i>0i--)

{

P2=0xff

}

do{

P2=P2-1

}while(P2>0x00)

P2=0x00

}

void timer0(void) interrupt 1//中断函数

{

P2=~P2//取反

TH0=0xff//重新装入初值

TL0=0x83

TR0=1

}

/*主函数*/

void main()

{

init_DA0832()//初始化

do

{

flag=kscan()

}while(!flag)//等待按键按下

while(1)

{

switch(flag)

{

case 1:

do{

flag=kscan()

sin()

}while(flag==1)//产生正弦波

break

case 2:

fangbo()

do{

flag=kscan()

}while(flag==2)//产生方波

TR0=0

break

case 3:

do{

flag=kscan()

sanjiaobo()

}while(flag==3)//产生三角波

break

case 4:

do{

flag=kscan()

tixingbo()

}while(flag==4)//产生梯形波

break

case 5:

do{

flag=kscan()

juchibo()

}while(flag==5)//产生锯齿波

break

default:

flag=kscan()

break

}

}

}

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