openwrt-安装-驱动-应用-lcd2004a实验

1. 板子f403tech的RT5350的板子和

(1)openWRT系统的定义和特点

OpenWrt是一个高度模块化、高度自动化的嵌入式Linux系统，拥有强大的网络组件，常常被

用于工控设备、电话、小型机器人、智能家居、路由器以及VOIP设备中。

OpenWrt支持各种处理器架构，无论是对ARM，X86，PowerPC或者MIPS都有很好的支持。

其多达3000多种软件包，囊括从工具链(toolchain)，到内核(linux kernel)，到软件包

(packages)，再到根文件系统(rootfs)整个体系，使得用户只需简单的一个make命令即可方便快

速地定制一个具有特定功能的嵌入式系统来制作固件。 其模块化设计也可以方便的移植各类功能

到OpenWrt下，加快开发速度。

2 实验mjpeg-streamer、uvc视频监控

3 openwrt的下载安装

<pre name="code" class="cpp">sudo apt-get install subversion
sudo apt-get install git-core
sudo apt-get install gcc g++ binutils patch bzip2 flex bison make autoconf gettext texinfo unzip sharutils zlib1g-dev libncurses5-dev gawk
mkdir openwrt
cd openwrt/
svn co svn://svn.openwrt.org/openwrt/trunk
cd trunk/
./scripts/feeds update -a
./scripts/feeds install -a
(4) 配置编译openWRT系统
a、选择CPU型号
TargetSystem —> RalinkRT288x/RT3xxx
b、选择CPU子型号
Subtarget —> RT3x5x/RT5350basedboards
c、选择具体路由器型号
Targetprofile—>HAME-MPR-A2
(5) 编译
make V=99

至此，完成内核和文件系统镜像编译

4 驱动开发流程

进入/home/openwrt/trunk/package/kernel驱动目录，仿照参考其他的驱动。

新建example文件夹，进入example文件夹。

创建Makefile：

#

# Copyright (C) 2008-2012 OpenWrt.org

#

# This is free software, licensed under the GNU General Public License v2.

# See /LICENSE for more information.

# modify by 2014-10-23

include $(TOPDIR)/rules.mk

include $(INCLUDE_DIR)/kernel.mk

PKG_NAME:=example

PKG_RELEASE:=1

include $(INCLUDE_DIR)/package.mk

define KernelPackage/example

SUBMENU:=Other modules

#  DEPENDS:[email protected]!LINUX_3_3

TITLE:=Simple example driver

FILES:=$(PKG_BUILD_DIR)/example.ko

#  AUTOLOAD:=$(call AutoLoad,30,gpio-button-hotplug,1)

KCONFIG:=

endef

define KernelPackage/example/description

This is a example for the following in-kernel drivers:

1) example one

2) example two

endef

MAKE_OPTS:= \

ARCH="$(LINUX_KARCH)" \

CROSS_COMPILE="$(TARGET_CROSS)" \

SUBDIRS="$(PKG_BUILD_DIR)"

define Build/Prepare

mkdir -p $(PKG_BUILD_DIR)

$(CP) ./src/* $(PKG_BUILD_DIR)/

endef

define Build/Compile

$(MAKE) -C "$(LINUX_DIR)" \

$(MAKE_OPTS) \

modules

endef

$(eval $(call KernelPackage,example))

新建srce文件夹，进入src文件夹。
创建Makefile：
obj-m += example.o
创建example.c源文件
#include <linux/module.h>
#include <linux/version.h>
#include <linux/kmod.h>

static int __init example_init(void)
{
        printk("hello example openwrt\n");
        return 0;
}

static void __exit example_exit(void)
{
        printk("hello example openwrt exit\n");
}

module_init(example_init);
module_exit(example_exit);

MODULE_AUTHOR("[email protected]");
MODULE_DESCRIPTION("example driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);

c.编译驱动的命令
make package/kernel/example/compile V=99
<pre name="code" class="cpp"><pre name="code" class="cpp">在/home/openwrt/trunk/bin/ramips/packages/base目录生成：kmod-example_3.14.18-1_ramips_24kec.ipk



5 应用开发流程


进入/home/openwrt/trunk/package应用目录。参考其他的应用文件。


创建helloworld文件夹，并进入。


创建Makefile：


##############################################


# OpenWrt Makefile for helloworld program


#


#


# Most of the variables used here are defined in


# the include directives below. We just need to


# specify a basic description of the package,


# where to build our program, where to find


# the source files, and where to install the


# compiled program on the router.


#


# Be very careful of spacing in this file.


# Indents should be tabs, not spaces, and


# there should be no trailing whitespace in


# lines that are not commented.


#


##############################################


include $(TOPDIR)/rules.mk


# Name and release number of this package


PKG_NAME:=helloworld


PKG_RELEASE:=1


# This specifies the directory where we‘re going to build the program.


# The root build directory, $(BUILD_DIR), is by default the build_mipsel


# directory in your OpenWrt SDK directory


PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)


include $(INCLUDE_DIR)/package.mk



# Specify package information for this program.


# The variables defined here should be self explanatory.


# If you are running Kamikaze, delete the DESCRIPTION


# variable below and uncomment the Kamikaze define


# directive for the description below


define Package/helloworld


SECTION:=utils


CATEGORY:=Utilities


TITLE:=Helloworld -- prints a snarky message


endef


# Uncomment portion below for Kamikaze and delete DESCRIPTION variable above


define Package/helloworld/description


If you can‘t figure out what this program does, you‘re probably


brain-dead and need immediate medical attention.


endef



# Specify what needs to be done to prepare for building the package.


# In our case, we need to copy the source files to the build directory.


# This is NOT the default.  The default uses the PKG_SOURCE_URL and the


# PKG_SOURCE which is not defined here to download the source from the web.


# In order to just build a simple program that we have just written, it is


# much easier to do it this way.


define Build/Prepare


mkdir -p $(PKG_BUILD_DIR)


$(CP) ./src/* $(PKG_BUILD_DIR)/


endef


# We do not need to define Build/Configure or Build/Compile directives


# The defaults are appropriate for compiling a simple program such as this one


# Specify where and how to install the program. Since we only have one file,


# the helloworld executable, install it by copying it to the /bin directory on


# the router. The $(1) variable represents the root directory on the router running


# OpenWrt. The $(INSTALL_DIR) variable contains a command to prepare the install


# directory if it does not already exist.  Likewise $(INSTALL_BIN) contains the


# command to copy the binary file from its current location (in our case the build


# directory) to the install directory.


define Package/helloworld/install


$(INSTALL_DIR) $(1)/bin


$(INSTALL_BIN) $(PKG_BUILD_DIR)/helloworld $(1)/bin/


endef


# This line executes the necessary commands to compile our program.


# The above define directives specify all the information needed, but this


# line calls BuildPackage which in turn actually uses this information to


# build a package.


$(eval $(call BuildPackage,helloworld))


创建src文件夹，并进入。


创建Makefile：


# build helloworld executable when user executes "make"


helloworld: helloworld.o


$(CC) $(LDFLAGS) helloworld.o -o helloworld


helloworld.o: helloworld.c


$(CC) $(CFLAGS) -c helloworld.c


# remove object files and executable when user executes "make clean"


clean:


rm *.o helloworld


创建helloworld.c:


#include<stdio.h>


int main(void)


{


printf("helloworld\n");


return 0;


}


make package/helloworld/motor/compile V=99


在/home/openwrt/trunk/bin/ramips/packages/base目录生成：helloworld_1_ramips_24kec.ipk


5 LCD2004实验


lcd_204a_drv.c 驱动源程序：


#include <linux/module.h>


#include <linux/kernel.h>


#include <linux/fs.h>


#include <linux/init.h>


#include <linux/delay.h>


#include <linux/device.h>


#include <asm/uaccess.h>


#include <asm/irq.h>


#include <asm/io.h>


static struct class *lcddrv_class;


static struct device *lcddrv_class_dev;


volatile unsigned long *GPIOMODE;


volatile unsigned long *I2C_CONFIG;


volatile unsigned long *I2C_CLKDIV;


volatile unsigned long *I2C_DEVADDR;


volatile unsigned long *I2C_ADDR;


volatile unsigned long *I2C_DATAOUT;


volatile unsigned long *I2C_STATUS;


volatile unsigned long *I2C_STARTXFR;


volatile unsigned long *I2C_BYTECNT;


static int lcd_204a_open(struct inode *inode, struct file *file)


{


return 0;


}


static ssize_t lcd_204a_write(struct file *file, const char __user *buf, size_t size, loff_t *ppos)


{


unsigned char val;


copy_from_user(&val, buf, 1);


*I2C_CONFIG = (0x6<<2)|(1<<1);                // 设备地址是7bit、不用发地址


*I2C_DEVADDR = 0x20;                        // 设备地址为0x20


*I2C_DATAOUT = val;


*I2C_STARTXFR = 0x0;


while(*I2C_STATUS & 0x1);



return 1;


}


static struct file_operations sencod_drv_fops = {


.owner        = THIS_MODULE,    /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */


.open        = lcd_204a_open,


.write        = lcd_204a_write,


};


int major;


static int lcd_204a_init(void)


{


major = register_chrdev(0, "lcd_204a", &sencod_drv_fops);


lcddrv_class = class_create(THIS_MODULE, "lcd");


lcddrv_class_dev = device_create(lcddrv_class, NULL, MKDEV(major, 0), NULL, "lcd"); /* /dev/204a */



/* 映射相应的寄存器的地址 */


GPIOMODE = (volatile unsigned long *)ioremap(0x10000060, 4);


I2C_CONFIG = (volatile unsigned long *)ioremap(0x10000900, 4);


I2C_CLKDIV = (volatile unsigned long *)ioremap(0x10000904, 4);


I2C_DEVADDR = (volatile unsigned long *)ioremap(0x10000908, 4);


I2C_ADDR = (volatile unsigned long *)ioremap(0x1000090C, 4);


I2C_DATAOUT = (volatile unsigned long *)ioremap(0x10000910, 4);


I2C_STATUS = (volatile unsigned long *)ioremap(0x10000918, 4);


I2C_STARTXFR = (volatile unsigned long *)ioremap(0x1000091C, 4);


I2C_BYTECNT = (volatile unsigned long *)ioremap(0x10000920, 4);


/* 开始设置这些寄存器 */


*GPIOMODE &= ~(1<<0);                        // I2C_GPIO_MODE


*I2C_CLKDIV = 0x200;                            // IIC总线时钟 = 40MHz / 512 = 79KHz



return 0;


}


static void lcd_204a_exit(void)


{


unregister_chrdev(major, "lcd_204a");


device_unregister(lcddrv_class_dev);


class_destroy(lcddrv_class);


iounmap(GPIOMODE);


iounmap(I2C_CONFIG);


iounmap(I2C_CLKDIV);


iounmap(I2C_DEVADDR);


iounmap(I2C_ADDR);


iounmap(I2C_DATAOUT);


iounmap(I2C_STATUS);


iounmap(I2C_STARTXFR);


iounmap(I2C_BYTECNT);


}


module_init(lcd_204a_init);


module_exit(lcd_204a_exit);


MODULE_LICENSE("GPL");


lcd2004的应用程序：


#include <sys/types.h>


#include <sys/stat.h>


#include <fcntl.h>


#include <stdio.h>


//根据LCD2004A和PCF8574T的引脚确定


//RS：指令/数据 寄存器选择  RS = 0 : 指令寄存器 RS = 1 : 数据寄存器   根据原理图得：RS 与 PCF8574T的PO链接


//RW：读/写 选择   R/W = 0 : 写     R/W = 1 : 读  根据原理图得：RW 与 PCF8574T的P1链接


//CS：允许信号    表示从高电平到低电平，


#define DATA(rs, rw, cs, data) (data<<4)|(cs<<2)|(rw<<1)|rs


int fd;


static void lcd_write_command(unsigned char command)


{


unsigned char data;


/* 1.发送命令的高4位 */


data = DATA(0, 0, 1, (command>>4));


printf("h data = %d\n", data);


write(fd, &data, 1);


usleep(20);


data = DATA(0, 0, 0, (command>>4));


printf("h data = %d\n", data);


write(fd, &data, 1);


/* 2.发送命令的低4位 */


data = DATA(0, 0, 1, (command&0x0f));


printf("l data = %d\n", data);


write(fd, &data, 1);


usleep(20);


data = DATA(0, 0, 0, (command&0x0f));


printf("l data = %d\n", data);


write(fd, &data, 1);


}


static void lcd_write_data(unsigned char wdata)


{


unsigned char data;


/* 1.发送命令的高4位 */


data = DATA(1, 0, 1, (wdata>>4));


printf("h data = %d\n", data);


write(fd, &data, 1);


usleep(20);


data = DATA(1, 0, 0, (wdata>>4));


printf("h data = %d\n", data);


write(fd, &data, 1);


/* 2.发送命令的低4位 */


data = DATA(1, 0, 1, (wdata&0x0f));


printf("l data = %d\n", data);


write(fd, &data, 1);


usleep(20);


data = DATA(1, 0, 0, (wdata&0x0f));


printf("l data = %d\n", data);


write(fd, &data, 1);


}


static void lcd_set_xy(unsigned char x, unsigned char y)


{


unsigned char address;


if (y == 0)


address = 0x80 + x;


else


address = 0xc0 + x;



lcd_write_command(address);


}


/*


函数名:


lcd_write_char()


功能:


列x=0~15,行y=0,1


用法:


*/


static void lcd_write_char(unsigned char X,unsigned char Y,unsigned char Recdata)


{


lcd_set_xy(X, Y);


lcd_write_data(Recdata);


}


static int lcd_PutStr(unsigned char *DData,int pos)


{


unsigned char i;



if(pos==-1)


{


lcd_write_command(0x01); //清屏


usleep(2);


pos=0;


}



while((*DData)!=‘\0‘)


{


switch(*DData)


{


case ‘\n‘: //如果是\n，则换行


{


if(pos<21)


{


for(i=pos;i<20;i++)


lcd_write_char(i%20, i/20, ‘ ‘);


pos=20;


}


else


{


for(i=pos;i<40;i++)


lcd_write_char(i%20, i/20, ‘ ‘);


pos=40;


}


break;


}


case ‘\b‘: //如果是\b，则退格


{


if(pos>0)


pos--;


lcd_write_char(pos%20, pos/20, ‘ ‘);


break;


}


default:


{


if((*DData)<0x20)


{


*DData=‘ ‘;


}


lcd_write_char(pos%20, pos/20,*DData);


pos++;


break;


}


}


DData++;


}


return(pos);


}


//从右边数，保留几位小数


static int lcd_PutNum(unsigned long num,int XS,int pos)


{


unsigned long tmp=0;


unsigned char numbits=0;



if(pos==-1)


{


lcd_write_command(0x01);


usleep(2);


pos=0;


}



if(num==0)


{


lcd_write_char(pos%20, pos/20, ‘0‘);


pos++;


}


else


{


if(num<0)


{


lcd_write_char(pos%20, pos/20, ‘-‘);


num*=(-1);


pos++;


}


while(num)


{


tmp=tmp*10+(num%10);


num=num/10;


numbits++;


}



while(tmp)


{


lcd_write_char(pos%20, pos/20, (tmp%10)+48);


tmp=tmp/10;


pos++;


numbits--;


if(numbits==XS)


pos=lcd_PutStr(".",pos); //显示小数点


}



while(numbits--)


{


lcd_write_char(pos%20, pos/20, ‘0‘);


pos++;


}


}



return(pos);


}


void lcd_put_char(unsigned char ch, unsigned int pos , int flag)


{


if(flag == 0)


{


lcd_write_command(0x80+pos);


}


if(flag == 1)


{


lcd_write_command(0xc0+pos);


}


lcd_write_data(ch);


}


void lcd_put_str(const char *str, int flag)


{


int cnt=0;


while(*str !=‘\0‘)


{


lcd_put_char(*str, cnt, flag);


cnt++;


str++;


}


}


/* seconddrvtest


*/


int main(int argc, char **argv)


{


int p;



fd = open("/dev/lcd", O_RDWR);


if (fd < 0)


{


printf("can‘t open!\n");


}


lcd_write_command(0x28);


usleep(1000);


lcd_write_command(0x28);


usleep(1000);


lcd_write_command(0x28);


usleep(1000);


lcd_write_command(0x0e);            // 显示开


usleep(1000);


lcd_write_command(0x01);            // 清屏


usleep(1000);



//    lcd_write_char(0, 0, "a");


int i = 0;


for(i=0; i<26; i++)


{


lcd_write_command(0x80+i);


lcd_write_data(‘a‘+i);


}


for(i=0; i<30; i++)


{


lcd_write_command(0xc0+i);


lcd_write_data(‘2‘+i);


}



sleep(10);


lcd_write_command(0x01);                        // 清屏


usleep(1000);


lcd_put_str("Welcome RT5350", 0);


lcd_put_str("        --By Dreeam", 1);


//p = lcd_PutStr("RT5350 By F403tech!\n",0);    // 显示一段文字


//usleep(1000);


//p = lcd_PutStr("f403tech.taobao.com\n",p);    // 显示一段文字


//lcd_PutNum(1234,2,p);                // 显示12.34这个数


return 0;


}


a.软件包管理常用命令


opkg install xxx.ipk                        // 安装指定的软件包


opkg remove xxx.ipk                            // 卸载已经安装过的指定的软件包


opkg list                                                // 获取软件列表


生成的驱动位于 /lib/modules/3.14.18/目录下。


<pre name="code" class="cpp">生成的应用位于 /bin目录下。




opkg help




				


				
时间： 2024-11-10 08:02:24 

		


		


	

	
	

		


		
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				1. 安装串口类型的驱动时,有可能会出现驱动安装不了的情况,报错:找不到相应文件或者找到文件,安装出错,如下图: 2.遇到此类问题,解决方法如下: 1>检查C盘路径下是否有“mdmcpq.inf”   "usbser.sys"文件,如果没有下载相应系统的文件, mdmcpq.inf 文件放在 c:\window\inf 下 usbser.sys 放在 c:\window\system32\dirver\下 重新安装驱动,如果不成功,请参考下面的方法. 2> 把usbser.