16×16LED扫描输出实验
16×16led扫描输出实验
一． 实验目的
使用户学会利用单片机的io 口进行led 点阵的扫描显示。
二． 实验设备及器件
ibm pc 机 一台
dp-51proc 单片机综合仿真实验仪 一台
三． 实验内容
编写一段程序，用p1 口控制c3 区4 片74hc164 进行行列扫描，使c3 区的16×
16 led 点阵显示用户指定的汉字。
四． 实验要求
学会使用单片机对led 点阵进行扫描显示。
五． 实验步骤
1. 使用导线将a2 区的p10~p14 与c3 区的l_dat_h、l_dat_l、l_clk、l_oe、
l_str 依次连接。
2. 运行光盘中的程序，显示“感谢您使用dp-51proc 单片机综合仿真实验仪！”，
先是向左滚动，后是向上滚动
3. 如果用户希望改变显示的汉字， 可以使用光盘中附带的字模提取软件
(pctolcd2002)提取用户希望显示汉字的字模，字模提取软件的设置为阴码、逐列
式、逆向、十六进制、c51 格式自定义，将生成的字模拷贝到程序中所指定的位置
插入即可。
六． 实验预习要求
阅读本书的2.8.19 节内容，理解硬件结构，还可以先把程序编好，然后在keil c51
环境下进行软件仿真。
七． 实验参考程序
#include
typedef unsigned char byte;
typedef unsigned int word;
sbit datah595=p1^0;
sbit datal595=p1^1;
sbit clk595=p1^2;
sbit oe595=p1^3;
sbit str595=p1^4;
word data datah,datal;
byte code displaydata[]=
{0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
//在以下位置插入字模
0x00,0x04,0x00,0x43,0xfc,0x70,0x14,0x00,0xd4,0x39,0x54,0x41,
0x54,0x41,0xd4,0x49,
0x04,0x50,0x3f,0x42,0xc4,0x41,0x45,0x61,0x36,0x0a,0x04,0x34,
0x00,0x27,0x00,0x00,/*感,0*/
0x40,0x00,0x42,0x00,0xcc,0x3f,0x04,0x50,0x00,0x29,0xfc,0x11,
0x56,0x4d,0x55,0x83,
0xfc,0x7f,0x50,0x00,0x90,0x41,0x10,0x80,0xff,0x7f,0x10,0x00,
0x10,0x00,0x00,0x00,/*谢,1*/
0x80,0x00,0x40,0x20,0x30,0x38,0xfc,0x03,0x03,0x38,0x90,0x40,
0x68,0x40,0x06,0x49,
0x04,0x52,0xf4,0x41,0x04,0x40,0x24,0x70,0x44,0x00,0x8c,0x09,
0x04,0x30,0x00,0x00,/*您,2*/
0x40,0x00,0x20,0x00,0xf0,0x7f,0x1c,0x00,0x07,0x40,0xf2,0x41,
0x94,0x22,0x94,0x14,
0x94,0x0c,0xff,0x13,0x94,0x10,0x94,0x30,0x94,0x20,0xf4,0x61,
0x04,0x20,0x00,0x00,/*使,3*/
0x00,0x80,0x00,0x40,0x00,0x30,0xfe,0x0f,0x22,0x02,0x22,0x02,
0x22,0x02,0x22,0x02,
0xfe,0xff,0x22,0x02,0x22,0x02,0x22,0x42,0x22,0x82,0xfe,0x7f,
0x00,0x00,0x00,0x00,/*用,4*/
0x08,0x20,0xf8,0x3f,0x08,0x20,0x08,0x20,0x08,0x20,0x10,0x10,
0xe0,0x0f,0x00,0x00,/*d*/
0x08,0x20,0xf8,0x3f,0x08,0x21,0x08,0x01,0x08,0x01,0x08,0x01,
0xf0,0x00,0x00,0x00,/*p, 5*/
0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x80,0x00,0x80,0x00,
0x80,0x00,0x80,0x00,
0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,/*－,6*/
0x00,0x00,0xf8,0x19,0x08,0x21,0x88,0x20,0x88,0x20,0x08,0x11,
0x08,0x0e,0x00,0x00,/*5*/
0x00,0x00,0x10,0x20,0x10,0x20,0xf8,0x3f,0x00,0x20,0x00,0x20,
0x00,0x00,0x00,0x00,/*1, 7*/
0x08,0x20,0xf8,0x3f,0x08,0x21,0x08,0x01,0x08,0x01,0x08,0x01,
0xf0,0x00,0x00,0x00,/*p*/
0x08,0x20,0xf8,0x3f,0x88,0x20,0x88,0x00,0x88,0x03,0x88,0x0c,
0x70,0x30,0x00,0x20,/*r, 8*/
0xe0,0x0f,0x10,0x10,0x08,0x20,0x08,0x20,0x08,0x20,0x10,0x10,
0xe0,0x0f,0x00,0x00,/*o*/
0xc0,0x07,0x30,0x18,0x08,0x20,0x08,0x20,0x08,0x20,0x08,0x10,
0x38,0x08,0x00,0x00,/*c, 9*/
0x00,0x08,0x00,0x08,0xf8,0x0b,0x28,0x09,0x29,0x09,0x2e,0x09,
0x2a,0x09,0xf8,0xff,
0x28,0x09,0x2c,0x09,0x2b,0x09,0x2a,0x09,0xf8,0x0b,0x00,0x08,
0x00,0x08,0x00,0x00,/*单,10*/
0x00,0x80,0x00,0x40,0x00,0x30,0xfe,0x0f,0x10,0x01,0x10,0x01,
0x10,0x01,0x10,0x01,
0x10,0x01,0x1f,0x01,0x10,0x01,0x10,0xff,0x10,0x00,0x18,0x00,
0x10,0x00,0x00,0x00,/*片,11*/
0x08,0x04,0x08,0x03,0xc8,0x00,0xff,0xff,0x48,0x00,0x88,0x41,
0x08,0x30,0x00,0x0c,
0xfe,0x03,0x02,0x00,0x02,0x00,0x02,0x00,0xfe,0x3f,0x00,0x40,
0x00,0x78,0x00,0x00,/*机,12*/
0x20,0x22,0x30,0x23,0xa8,0x22,0x67,0x12,0x32,0x12,0x00,0x20,
0x0c,0x11,0x24,0x0d,
0x24,0x41,0x25,0x81,0x26,0x7f,0x24,0x01,0x24,0x05,0x24,0x09,
0x0c,0x31,0x00,0x00,/*综,13*/
0x40,0x00,0x40,0x00,0x20,0x00,0x50,0x7e,0x48,0x22,0x44,0x22,
0x42,0x22,0x41,0x22,
0x42,0x22,0x44,0x22,0x68,0x22,0x50,0x7e,0x30,0x00,0x60,0x00,
0x20,0x00,0x00,0x00,/*合,14*/
0x40,0x00,0x20,0x00,0x10,0x00,0xec,0x7f,0x07,0x40,0x0a,0x20,
0x08,0x18,0x08,0x06,
0xf9,0x01,0x8a,0x10,0x8e,0x20,0x88,0x40,0x88,0x20,0xcc,0x1f,
0x88,0x00,0x00,0x00,/*仿,15*/
0x00,0x10,0x04,0x90,0x04,0x90,0x04,0x50,0xf4,0x5f,0x54,0x35,
0x5c,0x15,0x57,0x15,
0x54,0x15,0x54,0x35,0x54,0x55,0xf4,0x5f,0x04,0x90,0x06,0x90,
0x04,0x10,0x00,0x00,/*真,16*/
0x00,0x00,0x10,0x82,0x0c,0x82,0x04,0x42,0x4c,0x42,0xb4,0x23,
0x94,0x12,0x05,0x0a,
0xf6,0x07,0x04,0x0a,0x04,0x12,0x04,0xe2,0x14,0x42,0x0c,0x02,
0x04,0x02,0x00,0x00,/*实,17*/
0x02,0x08,0xfa,0x08,0x82,0x04,0x82,0x24,0xfe,0x40,0x80,0x3f,
0x40,0x22,0x60,0x2c,
0x58,0x21,0x46,0x2e,0x48,0x20,0x50,0x30,0x20,0x2c,0x20,0x23,
0x20,0x20,0x00,0x00,/*验,18*/
0x40,0x00,0x20,0x00,0xf0,0xff,0x0c,0x00,0x03,0x40,0x00,0x40,
0x38,0x20,0xc0,0x10,
0x01,0x0b,0x0e,0x04,0x04,0x0b,0xe0,0x10,0x1c,0x20,0x00,0x60,
0x00,0x20,0x00,0x00,/*仪,19*/
0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x5f,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,/*！,20*/
//至此字模插入结束
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00
};
byte *p=&displaydata[0];
byte *q=&displaydata[32];
void delay(word a)
{
word b;
for(b=0;b}
void senddata(word datah,datal)
{
byte i=0;
word m,n;
oe595=0;
str595=0;
for(;i<16;i++)
{
clk595=0;
m=datah;
n=~datal;
m&=0x8000;
n&=0x8000;
datah595=(bit)m;
datal595=(bit)n;
datah<<=1;
datal<<=1;
clk595=1;
}
str595=1;
str595=0;
}
void horizontal(byte time,word counth) //水平移动子程序
{
byte x,y;
word j,k,z;
for(z=0;z{
for(y=0;y{
datal=0x0001;
for(x=0;x<16;x++)
{
p+=3;
j=(word)*p;
j<<=8;
j&=0xff00;
p-=1;
k=(word)*p;
k&=0x00ff;
datah=j|k;
if(x)
{
datal<0;z--)
{
for(e=0;e<16;e++)
{
for(y=0;y{
datal=0x0001;
for(x=0;x<16;x++)
{
p+=3;
j=(word)*p;
j=w;
q+=3;
j=(word)*q;
j<<=8;
j&=0xff00;
q-=1;
k=(word)*q;
k&=0x00ff;
datah2=j|k;
datah2<<=(16-w);
datah=datah1|datah2;
if(x)
{
datal<>5)-1;
word counth=countv<<4;
byte a=(byte)((size-2)%32);
if(a==16)
{
counth+=8;
countv+=1;
}
while(1)
{
horizontal(time,counth);
delay(65535);
delay(65535);
vertical(a,time,countv);
delay(65535);
delay(65535);
}
}
八． 实验思考题
（1） 请用户思考一下，如何改变字体滚动的速度。
（2） 请用户再思考一下，如何实现字体的反白显示。
区块链存在的危险有哪些
了解半导体材料：硅
广告招牌定时器怎么调开关时间
智能书架中如何判断RFID读取系统是稳定高效的
小米生态链分析：“群架”打了两年半
16×16LED扫描输出实验
中国汽车经销商巨正通汽车深陷资金链危机
LED显示屏的安装方法有哪些
oppor11天猫搜索摇摇领先，是什么让它这么火？
纳芯微为中央空调应用提供全面的传感器解决方案
profinet转ethernet网关连接发那科机器人配置案例
基于ST7538和ATmega88V的电力线载波通信模块的设
硬技术华硕B365电竞特工主板介绍
三星显示SDC加速关闭LCD产能、转产OLED的进程 将对对全球面板供应结构产生巨大影响
iphone8最新消息,“iPhone8”其实应当叫iPhoneEdition,iPhone8外形终于确定
南方电网计划将广西电网建设成为全国一流的智能电网示范区
电容在电路中各种基本常识，你了解多少？
美的电磁炉维修故障代码
车速传感器的作用_车速传感器电路图
贴片元件松动和共振的影响
一． 实验目的
使用户学会利用单片机的io 口进行led 点阵的扫描显示。
二． 实验设备及器件
ibm pc 机 一台
dp-51proc 单片机综合仿真实验仪 一台
三． 实验内容
编写一段程序，用p1 口控制c3 区4 片74hc164 进行行列扫描，使c3 区的16×
16 led 点阵显示用户指定的汉字。
四． 实验要求
学会使用单片机对led 点阵进行扫描显示。
五． 实验步骤
1. 使用导线将a2 区的p10~p14 与c3 区的l_dat_h、l_dat_l、l_clk、l_oe、
l_str 依次连接。
2. 运行光盘中的程序，显示“感谢您使用dp-51proc 单片机综合仿真实验仪！”，
先是向左滚动，后是向上滚动
3. 如果用户希望改变显示的汉字， 可以使用光盘中附带的字模提取软件
(pctolcd2002)提取用户希望显示汉字的字模，字模提取软件的设置为阴码、逐列
式、逆向、十六进制、c51 格式自定义，将生成的字模拷贝到程序中所指定的位置
插入即可。
六． 实验预习要求
阅读本书的2.8.19 节内容，理解硬件结构，还可以先把程序编好，然后在keil c51
环境下进行软件仿真。
七． 实验参考程序
#include
typedef unsigned char byte;
typedef unsigned int word;
sbit datah595=p1^0;
sbit datal595=p1^1;
sbit clk595=p1^2;
sbit oe595=p1^3;
sbit str595=p1^4;
word data datah,datal;
byte code displaydata[]=
{0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
//在以下位置插入字模
0x00,0x04,0x00,0x43,0xfc,0x70,0x14,0x00,0xd4,0x39,0x54,0x41,
0x54,0x41,0xd4,0x49,
0x04,0x50,0x3f,0x42,0xc4,0x41,0x45,0x61,0x36,0x0a,0x04,0x34,
0x00,0x27,0x00,0x00,/*感,0*/
0x40,0x00,0x42,0x00,0xcc,0x3f,0x04,0x50,0x00,0x29,0xfc,0x11,
0x56,0x4d,0x55,0x83,
0xfc,0x7f,0x50,0x00,0x90,0x41,0x10,0x80,0xff,0x7f,0x10,0x00,
0x10,0x00,0x00,0x00,/*谢,1*/
0x80,0x00,0x40,0x20,0x30,0x38,0xfc,0x03,0x03,0x38,0x90,0x40,
0x68,0x40,0x06,0x49,
0x04,0x52,0xf4,0x41,0x04,0x40,0x24,0x70,0x44,0x00,0x8c,0x09,
0x04,0x30,0x00,0x00,/*您,2*/
0x40,0x00,0x20,0x00,0xf0,0x7f,0x1c,0x00,0x07,0x40,0xf2,0x41,
0x94,0x22,0x94,0x14,
0x94,0x0c,0xff,0x13,0x94,0x10,0x94,0x30,0x94,0x20,0xf4,0x61,
0x04,0x20,0x00,0x00,/*使,3*/
0x00,0x80,0x00,0x40,0x00,0x30,0xfe,0x0f,0x22,0x02,0x22,0x02,
0x22,0x02,0x22,0x02,
0xfe,0xff,0x22,0x02,0x22,0x02,0x22,0x42,0x22,0x82,0xfe,0x7f,
0x00,0x00,0x00,0x00,/*用,4*/
0x08,0x20,0xf8,0x3f,0x08,0x20,0x08,0x20,0x08,0x20,0x10,0x10,
0xe0,0x0f,0x00,0x00,/*d*/
0x08,0x20,0xf8,0x3f,0x08,0x21,0x08,0x01,0x08,0x01,0x08,0x01,
0xf0,0x00,0x00,0x00,/*p, 5*/
0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x80,0x00,0x80,0x00,
0x80,0x00,0x80,0x00,
0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,/*－,6*/
0x00,0x00,0xf8,0x19,0x08,0x21,0x88,0x20,0x88,0x20,0x08,0x11,
0x08,0x0e,0x00,0x00,/*5*/
0x00,0x00,0x10,0x20,0x10,0x20,0xf8,0x3f,0x00,0x20,0x00,0x20,
0x00,0x00,0x00,0x00,/*1, 7*/
0x08,0x20,0xf8,0x3f,0x08,0x21,0x08,0x01,0x08,0x01,0x08,0x01,
0xf0,0x00,0x00,0x00,/*p*/
0x08,0x20,0xf8,0x3f,0x88,0x20,0x88,0x00,0x88,0x03,0x88,0x0c,
0x70,0x30,0x00,0x20,/*r, 8*/
0xe0,0x0f,0x10,0x10,0x08,0x20,0x08,0x20,0x08,0x20,0x10,0x10,
0xe0,0x0f,0x00,0x00,/*o*/
0xc0,0x07,0x30,0x18,0x08,0x20,0x08,0x20,0x08,0x20,0x08,0x10,
0x38,0x08,0x00,0x00,/*c, 9*/
0x00,0x08,0x00,0x08,0xf8,0x0b,0x28,0x09,0x29,0x09,0x2e,0x09,
0x2a,0x09,0xf8,0xff,
0x28,0x09,0x2c,0x09,0x2b,0x09,0x2a,0x09,0xf8,0x0b,0x00,0x08,
0x00,0x08,0x00,0x00,/*单,10*/
0x00,0x80,0x00,0x40,0x00,0x30,0xfe,0x0f,0x10,0x01,0x10,0x01,
0x10,0x01,0x10,0x01,
0x10,0x01,0x1f,0x01,0x10,0x01,0x10,0xff,0x10,0x00,0x18,0x00,
0x10,0x00,0x00,0x00,/*片,11*/
0x08,0x04,0x08,0x03,0xc8,0x00,0xff,0xff,0x48,0x00,0x88,0x41,
0x08,0x30,0x00,0x0c,
0xfe,0x03,0x02,0x00,0x02,0x00,0x02,0x00,0xfe,0x3f,0x00,0x40,
0x00,0x78,0x00,0x00,/*机,12*/
0x20,0x22,0x30,0x23,0xa8,0x22,0x67,0x12,0x32,0x12,0x00,0x20,
0x0c,0x11,0x24,0x0d,
0x24,0x41,0x25,0x81,0x26,0x7f,0x24,0x01,0x24,0x05,0x24,0x09,
0x0c,0x31,0x00,0x00,/*综,13*/
0x40,0x00,0x40,0x00,0x20,0x00,0x50,0x7e,0x48,0x22,0x44,0x22,
0x42,0x22,0x41,0x22,
0x42,0x22,0x44,0x22,0x68,0x22,0x50,0x7e,0x30,0x00,0x60,0x00,
0x20,0x00,0x00,0x00,/*合,14*/
0x40,0x00,0x20,0x00,0x10,0x00,0xec,0x7f,0x07,0x40,0x0a,0x20,
0x08,0x18,0x08,0x06,
0xf9,0x01,0x8a,0x10,0x8e,0x20,0x88,0x40,0x88,0x20,0xcc,0x1f,
0x88,0x00,0x00,0x00,/*仿,15*/
0x00,0x10,0x04,0x90,0x04,0x90,0x04,0x50,0xf4,0x5f,0x54,0x35,
0x5c,0x15,0x57,0x15,
0x54,0x15,0x54,0x35,0x54,0x55,0xf4,0x5f,0x04,0x90,0x06,0x90,
0x04,0x10,0x00,0x00,/*真,16*/
0x00,0x00,0x10,0x82,0x0c,0x82,0x04,0x42,0x4c,0x42,0xb4,0x23,
0x94,0x12,0x05,0x0a,
0xf6,0x07,0x04,0x0a,0x04,0x12,0x04,0xe2,0x14,0x42,0x0c,0x02,
0x04,0x02,0x00,0x00,/*实,17*/
0x02,0x08,0xfa,0x08,0x82,0x04,0x82,0x24,0xfe,0x40,0x80,0x3f,
0x40,0x22,0x60,0x2c,
0x58,0x21,0x46,0x2e,0x48,0x20,0x50,0x30,0x20,0x2c,0x20,0x23,
0x20,0x20,0x00,0x00,/*验,18*/
0x40,0x00,0x20,0x00,0xf0,0xff,0x0c,0x00,0x03,0x40,0x00,0x40,
0x38,0x20,0xc0,0x10,
0x01,0x0b,0x0e,0x04,0x04,0x0b,0xe0,0x10,0x1c,0x20,0x00,0x60,
0x00,0x20,0x00,0x00,/*仪,19*/
0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x5f,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,/*！,20*/
//至此字模插入结束
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00
};
byte *p=&displaydata[0];
byte *q=&displaydata[32];
void delay(word a)
{
word b;
for(b=0;b
void senddata(word datah,datal)
{
byte i=0;
word m,n;
oe595=0;
str595=0;
for(;i<16;i++)
{
clk595=0;
m=datah;
n=~datal;
m&=0x8000;
n&=0x8000;
datah595=(bit)m;
datal595=(bit)n;
datah<<=1;
datal<<=1;
clk595=1;
}
str595=1;
str595=0;
}
void horizontal(byte time,word counth) //水平移动子程序
{
byte x,y;
word j,k,z;
for(z=0;z
for(y=0;y
datal=0x0001;
for(x=0;x<16;x++)
{
p+=3;
j=(word)*p;
j<<=8;
j&=0xff00;
p-=1;
k=(word)*p;
k&=0x00ff;
datah=j|k;
if(x)
{
datal<0;z--)
{
for(e=0;e<16;e++)
{
for(y=0;y
datal=0x0001;
for(x=0;x<16;x++)
{
p+=3;
j=(word)*p;
j=w;
q+=3;
j=(word)*q;
j<<=8;
j&=0xff00;
q-=1;
k=(word)*q;
k&=0x00ff;
datah2=j|k;
datah2<<=(16-w);
datah=datah1|datah2;
if(x)
{
datal<>5)-1;
word counth=countv<<4;
byte a=(byte)((size-2)%32);
if(a==16)
{
counth+=8;
countv+=1;
}
while(1)
{
horizontal(time,counth);
delay(65535);
delay(65535);
vertical(a,time,countv);
delay(65535);
delay(65535);
}
}
八． 实验思考题
（1） 请用户思考一下，如何改变字体滚动的速度。
（2） 请用户再思考一下，如何实现字体的反白显示。
区块链存在的危险有哪些
了解半导体材料：硅
广告招牌定时器怎么调开关时间
智能书架中如何判断RFID读取系统是稳定高效的
小米生态链分析：“群架”打了两年半
16×16LED扫描输出实验
中国汽车经销商巨正通汽车深陷资金链危机
LED显示屏的安装方法有哪些
oppor11天猫搜索摇摇领先，是什么让它这么火？
纳芯微为中央空调应用提供全面的传感器解决方案
profinet转ethernet网关连接发那科机器人配置案例
基于ST7538和ATmega88V的电力线载波通信模块的设
硬技术华硕B365电竞特工主板介绍
三星显示SDC加速关闭LCD产能、转产OLED的进程 将对对全球面板供应结构产生巨大影响
iphone8最新消息,“iPhone8”其实应当叫iPhoneEdition,iPhone8外形终于确定
南方电网计划将广西电网建设成为全国一流的智能电网示范区
电容在电路中各种基本常识，你了解多少？
美的电磁炉维修故障代码
车速传感器的作用_车速传感器电路图
贴片元件松动和共振的影响