i2cdetect 工具简单使用

9 天前 | 嵌入式笔记 | justchen | 暂无评论 | 32 views

列出所有I2C设备 i2cdetect -l 返回

i2c-3   i2c             xiic-i2c                                I2C adapter
i2c-1   i2c             Cadence I2C at ff020000                 I2C adapter
i2c-2   i2c             Cadence I2C at ff030000                 I2C adapter
i2c-0   i2c             xiic-i2c                                I2C adapter

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i2c-3 i2c xiic-i2c I2C adapter

i2c-1 i2c Cadence I2C at ff020000 I2C adapter

i2c-2 i2c Cadence I2C at ff030000 I2C adapter

i2c-0 i2c xiic-i2c I2C adapter

列出总线上所有有回应的设备

i2cdetect -y -r 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: -- UU -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

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i2cdetect -y -r 1

0 1 2 3 4 5 6 7 8 9 a b c d e f

00: -- -- -- -- -- -- -- -- -- -- -- -- --

10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- --

20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --

50: -- UU -- -- -- -- -- -- -- -- -- -- -- -- -- --

60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

70: -- -- -- -- -- -- -- --

读取某个设备上的 00~FF的内容

i2cdump -f -y 3 0x18
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 00 00 10 04 00 00 00 00 00 00 01 00 00 00 80    ...??......?...?
10: 80 ff ff 78 78 78 78 78 78 06 00 fe 00 00 fe 00    ?..xxxxxx?.?..?.
20: 00 00 00 00 10 00 00 00 00 00 00 80 80 00 00 00    ....?......??...
30: 00 00 00 04 00 00 00 00 00 00 04 00 00 00 00 00    ...?......?.....
40: 00 04 00 00 00 00 00 00 04 00 00 00 00 00 00 00    .?......?.......
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
60: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00    ......?.........
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
80: 00 00 00 10 04 00 00 00 00 00 00 01 00 00 00 80    ...??......?...?
90: 80 ff ff 78 78 78 78 78 78 06 00 fe 00 00 fe 00    ?..xxxxxx?.?..?.
a0: 00 00 00 00 10 00 00 00 00 00 00 80 80 00 00 00    ....?......??...
b0: 00 00 00 04 00 00 00 00 00 00 04 00 00 00 00 00    ...?......?.....
c0: 00 04 00 00 00 00 00 00 04 00 00 00 00 00 00 00    .?......?.......
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
e0: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00    ......?.........
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

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i2cdump -f -y 3 0x18

No size specified (using byte-data access)

0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef

00: 00 00 00 10 04 00 00 00 00 00 00 01 00 00 00 80 ...??......?...?

10: 80 ff ff 78 78 78 78 78 78 06 00 fe 00 00 fe 00 ?..xxxxxx?.?..?.

20: 00 00 00 00 10 00 00 00 00 00 00 80 80 00 00 00 ....?......??...

30: 00 00 00 04 00 00 00 00 00 00 04 00 00 00 00 00 ...?......?.....

40: 00 04 00 00 00 00 00 00 04 00 00 00 00 00 00 00 .?......?.......

50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

60: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00 ......?.........

70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

80: 00 00 00 10 04 00 00 00 00 00 00 01 00 00 00 80 ...??......?...?

90: 80 ff ff 78 78 78 78 78 78 06 00 fe 00 00 fe 00 ?..xxxxxx?.?..?.

a0: 00 00 00 00 10 00 00 00 00 00 00 80 80 00 00 00 ....?......??...

b0: 00 00 00 04 00 00 00 00 00 00 04 00 00 00 00 00 ...?......?.....

c0: 00 04 00 00 00 00 00 00 04 00 00 00 00 00 00 00 .?......?.......

d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

e0: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00 ......?.........

f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

ROC-RK3328-PC更换串口波特率

2020/11/18 | 嵌入式笔记 | justchen | 暂无评论 | 277 views

板子默认串口波特率为1500000，我不知道为毛要搞这么高。反正我的U转串是不支持的，需要修改下。编译时使用的是firefly-rk3328-buildroot.mk,看环境变量为如下:

CMD=`realpath $BASH_SOURCE`
CUR_DIR=`dirname $CMD`

source $CUR_DIR/BoardConfig.mk

# Uboot defconfig
export RK_UBOOT_DEFCONFIG=firefly-rk3328
# Kernel defconfig
export RK_KERNEL_DEFCONFIG=firefly-rk3328_defconfig
# Kernel dts
export RK_KERNEL_DTS=rk3328-roc-cc
# packagefile for make update image 
export RK_PACKAGE_FILE=rk3328-package-file

# sd_parameter for GPT table
export RK_SD_PARAMETER=parameter-recovery.txt
# packagefile for make sdupdate image
export RK_SD_PACKAGE_FILE=rk3328-recovery-package-file

export RK_USERDATA_FS_TYPE=ext4

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CMD=`realpath $BASH_SOURCE`

CUR_DIR=`dirname $CMD`

source $CUR_DIR/BoardConfig.mk

# Uboot defconfig

export RK_UBOOT_DEFCONFIG=firefly-rk3328

# Kernel defconfig

export RK_KERNEL_DEFCONFIG=firefly-rk3328_defconfig

# Kernel dts

export RK_KERNEL_DTS=rk3328-roc-cc

# packagefile for make update image

export RK_PACKAGE_FILE=rk3328-package-file

# sd_parameter for GPT table

export RK_SD_PARAMETER=parameter-recovery.txt

# packagefile for make sdupdate image

export RK_SD_PACKAGE_FILE=rk3328-recovery-package-file

export RK_USERDATA_FS_TYPE=ext4

判断uboot的configure为firefly-rk3328,直接找到u-boo……

linxu 线程独占CPU

2020/11/08 | 嵌入式笔记 | justchen | 暂无评论 | 402 views

线程或进程独占CPU一般用来相对地提升实时性,但也不要指忘达到真正的实时操作系统的性能. 进程邦定CPU 我们通过系统调用sched_setaffinity进行绑定，通过sched_getaffinity获取绑定关系。注意这对方法是进程级别的绑定。代码中指定cpu0和cpu3，我们可以通过htop查看，两个cpu使用达到了100%，其他的……

qt network相关

2020/07/23 | QT | justchen | 暂无评论 | 553 views

获取所有活动网卡

    int ipInc = 0;

    QStringList ipList;
    ipList.clear();

    QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
    QList<QNetworkInterface> ipDevList = QNetworkInterface::allInterfaces();

#ifdef Q_OS_ANDROID
    ipList << "Android Boardcast";
#endif

    for (int i = 0; i < ipDevList.size(); ++i) {
        bool ipReady = false;
        QList<QNetworkAddressEntry> tmpIPlist = ipDevList.at(i).addressEntries();


        // 排除所有未连接的网卡
        QNetworkInterface tmpNet = ipDevList.at(i);
        QNetworkInterface::InterfaceFlags interFlags;
        interFlags = tmpNet.flags();
        if(!((interFlags&QNetworkInterface::IsUp) &&
            (interFlags&QNetworkInterface::IsRunning) &&
            (interFlags&QNetworkInterface::CanBroadcast) &&
            (interFlags&QNetworkInterface::CanMulticast) &&
            !(interFlags&QNetworkInterface::IsLoopBack)))
        {
            continue;
        }

        QString tmpIp;
        for (int y=0; y<tmpIPlist.size(); ++y)
        {
            QNetworkAddressEntry xx = tmpIPlist.at(y);

            if (xx.ip() != QHostAddress::LocalHost && xx.ip().toIPv4Address() )
            {
                ipReady = true;
                tmpIp = xx.ip().toString();
                break;
            }
        }
        if( true == ipReady )
        {
            ipList << tmpIp + " (" + ipDevList.at(i).humanReadableName() + ")";
            if( tmpIp == lastUdpIp )
            {
                autoLinkIpSeqInList = ipInc;
            }
            ipInc++;
        }
    }
    qDebug() << "ipList:" << ipList;

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int ipInc = 0;

QStringList ipList;

ipList.clear();

QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();

QList<QNetworkInterface> ipDevList = QNetworkInterface::allInterfaces();

#ifdef Q_OS_ANDROID

ipList << "Android Boardcast";

#endif

for (int i = 0; i < ipDevList.size(); ++i) {

bool ipReady = false;

QList<QNetworkAddressEntry> tmpIPlist = ipDevList.at(i).addressEntries();

// 排除所有未连接的网卡

QNetworkInterface tmpNet = ipDevList.at(i);

QNetworkInterface::InterfaceFlags interFlags;

interFlags = tmpNet.flags();

if(!((interFlags&QNetworkInterface::IsUp) &&

(interFlags&QNetworkInterface::IsRunning) &&

(interFlags&QNetworkInterface::CanBroadcast) &&

(interFlags&QNetworkInterface::CanMulticast) &&

!(interFlags&QNetworkInterface::IsLoopBack)))

{

continue;

}

QString tmpIp;

for (int y=0; y<tmpIPlist.size(); ++y)

{

QNetworkAddressEntry xx = tmpIPlist.at(y);

if (xx.ip() != QHostAddress::LocalHost && xx.ip().toIPv4Address() )

{

ipReady = true;

tmpIp = xx.ip().toString();

break;

}

if( true == ipReady )

{

ipList << tmpIp + " (" + ipDevList.at(i).humanReadableName() + ")";

if( tmpIp == lastUdpIp )

{

autoLinkIpSeqInList = ipInc;

}

ipInc++;

}

qDebug() << "ipList:" << ipList;

在TCP SERVER中获取CLIENT的IP及端口

//clientIP = tcpSocket->peerAddress().toString();  // 网上的这种方法不可用,会多出来一些字符
quint32 ipv4 = tcpSocket->peerAddress().toIPv4Address();
char xx[30];
sprintf(xx, "%d.%d.%d.%d",ipv4>>24,(ipv4>>16)&0xFF,(ipv4>>8)&0xFF ,ipv4&0xFF);
clientIP = xx;
clientPort = tcpSocket->peerPort();

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//clientIP = tcpSocket->peerAddress().toString(); // 网上的这种方法不可用,会多出来一些字符

quint32 ipv4 = tcpSocket->peerAddress().toIPv4Address();

char xx[30];

sprintf(xx, "%d.%d.%d.%d",ipv4>>24,(ipv4>>16)&0xFF,(ipv4>>8)&0xFF ,ipv4&0xFF);

clientIP = xx;

clientPort = tcpSocket->peerPort();

‘Access-Control-Allow-Origin’跨域问题解决 (vue axios)

2020/06/11 | node.js | justchen | 暂无评论 | 600 views

在nodejs中使用AXIOS发送get请求到其他IP请求数据时,会报错Access-Control-Allow-Origin之类的错误. 要解决的需要前端与webserver端共同配合才行. 因为我的webserver是ARM板子,响应请求数据中HTTP HEAD信息只有HTTP/1.1 200 OK\n,这显然不够. 经过查找资料,增……

uboot下备份镜像

2020/04/22 | 海思 | justchen | 暂无评论 | 793 views

当前仅适用于海思 1 、设置环境变量 setenv serverip 192.168.230.111 setenv ipaddr 192.168.230.124 sa ping 192.168.230.111 2、将要备份flash数据读入内存中 sf probe 0 sf read 82000000 100000 400000 s……

QT VirtualKeyboard 插件编译与使用

2020/02/19 | QT | justchen | 暂无评论 | 3659 views

编译安装正常情况下该插件都是需要自行编译的. 方法也简单得要死在QT源码中有qtvirtualkeyboard这样一个目录, 进入该目录然qmake对应的pro文件,生成makefile后make/make install就行了. qmake时需要加对应参数,比如 qmake ../ CONFIG+=”lang-en_GB lang-……

使用JavaScript对json数组的各种处理方法 filter map forEach..

2019/10/29 | node.js | justchen | 暂无评论 | 864 views

filter方法介绍语法：array.filter(function(currentValue,index,arr), thisValue) 参数用处 function(currentValue,index,arr) 每个元素都回调用该方法 currentValue 必须。当前元素的值 index 可选。当前元素的索引值 arr 可选……

vue学习笔记

2019/10/24 | node.js | justchen | 暂无评论 | 639 views

基本操作 js文件 <script src=”js/vue.js”></script> 就收工了.正式环境用 vue.min.js v-for对json数据的邦定当点击时某个按钮时，更改自已与其他对象的css

<div id="insource" class="col-xs-12">
    <hr>
    <span class="btn btn-app btn-sm btn-pink no-hover" v-for="abc in items">
        <P></P>
        <span class="line-height-1 smaller-90">{{ abc.alias }}</span>
        <p> <span class="line-height-1 smaller-60">{{ abc.id + ":" + abc.type }}</span> </p>
        <p> <span class="line-height-1 smaller-80">{{ abc.group }}</span> </p>
        <span class="badge badge-warning badge-left">电视墙</span>
    </span>
</div>

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<hr>

<P></P>

<span class="line-height-1 smaller-90">{{ abc.alias }}</span>

<p> <span class="line-height-1 smaller-80">{{ abc.group }}</span> </p>

</span>

</div>

[crayon-6044703f9d8……

jQuery 学习笔记一

2019/10/14 | 未分类 | justchen | 暂无评论 | 605 views

基本用法 get数据

function loadXMLDoc_justchen() {
    $.get("/action/led", function (data, status) {      //  GET 参数，回调函数(参数,状态)
        $("#NODE-SN").text(data);   // 查找到ID为NODE-SN的项目并将其更改为文本
        //console.log(data);
    });
}

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function loadXMLDoc_justchen() {

$.get("/action/led", function (data, status) { // GET 参数，回调函数(参数,状态)

$("#NODE-SN").text(data); // 查找到ID为NODE-SN的项目并将其更改为文本

//console.log(data);

});

}

当面页ready 后加载数据

$(document).ready(function () {
    loadXMLDoc_justchen();
});

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$(document).ready(function () {

loadXMLDoc_justchen();

});

定时刷新数据实际上就是加入 setInterval 方法 setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。 setIn……

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