jozochen

blog

0%

发表于 更新于 分类于 ， Valine：

pinctrl_gpio

功能对比

gpio pinctrl
输入输出高低电平 引脚功能MUX
接收外部中断 配置上下拉及驱动能力

内核api

pinctrl

1
2
3
4
5
6
//获取一个pinctrl句柄
struct pinctrl *devm_pinctrl_get(struct device *dev);
//获取这个pin对应pin_state
struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name);
//设置引脚为为某个stata  
int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state);

gpio

of api

1
2
3
4
5
6
//获取设备树某个属性里面定义了几个 GPIO 信息，要注意的是空的 GPIO 信息也会被统计到
int of_gpio_named_count(struct device_node *np, const char *propname);
//同上 此函数统计的是“gpios”这个属性的 GPIO 数量
int of_gpio_count(struct device_node *np);
//函数获取 GPIO 编号  
int of_get_named_gpio(struct device_node *np,const char *propname,int index);

控制api

1
2
3
4
5
6
7
8
int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
//flags: GPIOF_DIR_OUT/GPIOF_IN
int devm_gpio_request_one(struct device *dev, unsigned gpio,
			  unsigned long flags, const char *label);
void devm_gpio_free(struct device *dev, unsigned int gpio);

static inline int gpio_get_value(unsigned gpio);
static inline void gpio_set_value(unsigned gpio, int value);

发表于 更新于 分类于 ， Valine：

debug_print

printk

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
//消息级别 
#include <linux/kern_levels.h>
#define KERN_SOH  "\001" 
#define KERN_EMERG KERN_SOH "0"  /* 紧急事件，一般是内核崩溃 */
#define KERN_ALERT KERN_SOH "1"  /* 必须立即采取行动 */
#define KERN_CRIT  KERN_SOH "2"  /* 临界条件，比如严重的软件或硬件错误*/
#define KERN_ERR  KERN_SOH "3"  /* 错误状态，一般设备驱动程序中使用KERN_ERR 报告硬件错误 */
#define KERN_WARNING KERN_SOH "4"  /* 警告信息，不会对系统造成严重影响 */
#define KERN_NOTICE  KERN_SOH "5"  /* 有必要进行提示的一些信息 */
#define KERN_INFO  KERN_SOH "6"  /* 提示性的信息 */
#define KERN_DEBUG KERN_SOH "7"  /* 调试信息 */

#include <linux/printk.h>
#define CONSOLE_LOGLEVEL_DEFAULT 7 /*优先级高于 7 的消息才能显示在控制台上*/  

//printk 不带消息级别将会采用默认级别MESSAGE_LOGLEVEL_DEFAULT 4
printk(KERN_EMERG "gsmi: Log Shutdown Reason\n");

//修改可输出消息级别 
#cat /proc/sys/kernel/printk               //查看printk对应的打印级别
//修改init.rc 
#echo 8 4 1 7 > /proc/sys/kernel/printk    //打开打印
#echo 1 4 1 7 > /proc/sys/kernel/printk    //关闭打印

dev_info/dev_dbg/dev_err

#include <linux/device.h>

#if defined(CONFIG_DYNAMIC_DEBUG)
#define dev_dbg(dev, format, ...)             \
do {                             \
    dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
} while (0)
#elif defined(DEBUG)
#define dev_dbg(dev, format, arg...)        \
    dev_printk(KERN_DEBUG, dev, format, ##arg)
#else
#define dev_dbg(dev, format, arg...)                \
({                                \
    if (0)                            \
        dev_printk(KERN_DEBUG, dev, format, ##arg);    \
})

//在需要使能dev_dbg的文件顶部 #define DEBUG

发表于 更新于 分类于 ， Valine：

source update

ubuntu

修改 /etc/apt/sources.list 在最前面增加源
更新源 apt-get update
升级软件 apt-get upgrade 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
#阿里
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse  
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse  
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse  
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse  
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse  
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse  
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse  

#中科大  
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse  
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse  
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse  
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse  
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse  
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse  
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse  
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse  
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse  
#deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse  

#163  
deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse  
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse  
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse  
deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse  
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse  
#deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse  
#deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse  
#deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse  
#deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse  
#deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse  

#清华  
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse  
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse  
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse  
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse  
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse  
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse  
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse  
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse  
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse  
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

debian

修改 /etc/apt/sources.list 在最前面增加源
更新源 apt-get update
升级软件 apt-get upgrade 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
#网易
deb http://mirrors.163.com/debian/ stretch main non-free contrib
deb http://mirrors.163.com/debian/ stretch-updates main non-free contrib
deb http://mirrors.163.com/debian/ stretch-backports main non-free contrib
#deb-src http://mirrors.163.com/debian/ stretch main non-free contrib
#deb-src http://mirrors.163.com/debian/ stretch-updates main non-free contrib
#deb-src http://mirrors.163.com/debian/ stretch-backports main non-free contrib
deb http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib
#deb-src http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib

#清华大学更新源
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free

发表于 更新于 分类于 ， Valine：

常用指令

tar

解包：tar -xvf filename.tar
打包：tar -cvf filename.tar dirname (dirname2 dirname3)
解包(软链接)：tar -xvf filename.tar git
打包(软链接)：tar -hcvf filename.tar dirname (dirname2 dirname3)

zip

解压：unzip filename.zip
压缩：zip -r filename.zip dirname

rar

解压：unrar e test.rar
压缩：rar a test.rar test

mv

多文件：mv src1 src2 src3 -t dest

ln

硬链接（同一文件）：ln src dest
软链接（快捷方式）：ln -s src dest

find （查找文件）

find dirname -name “str”

grep （查找字符串）

grep “str” dirname -R

mkdir

创建并设置权限：mkdir -m 777 dirname
创建路径上的目录：mkdir -p rootdir/dirname

cp

-a 该选项通常在拷贝目录时使用。它保留链接、文件属性，并递归地拷贝目录，其作用等于dpr选项的组合

useradd

增加用户: useradd tt
删除用户：userdel -r(同时删除文件) tt