tslib1.4移植经验记录

确认当前交叉编译工具链能够正常工作

编译helloworld测试，暂略。
如果有问题，查看嵌入式linux库版本strings /usr/lib/libstdc++.so.6 | grep GLIBCXX
查看/lib目录动态链接库加载器版本
用file检查比对编译的执行文件区别

tslib1.4编译指令

在tslib-1.4源代码目录建立文件compilerconf.sh内容如下：

#!/bin/sh
./autogen.sh
make clean && make distclean
echo "ac_cv_func_malloc_0_nonnull=yes" >arm-linux.cache
./configure --host=arm-linux --prefix=/opt/tslib1.4 --cache-file=arm-linux.cache \
CC=/home/toolchain/v7-toolchain/bin/arm-linux-gnueabi-gcc
make && make install

–host=arm-linux，目标环境为arm版本linux
–prefix=/opt/tslib1.4，用于指定make install安装目录
CC=/home/toolchain/v7-toolchain/bin/arm-linux-gnueabi-gcc，用于指定嵌入式linux目标环境交叉编译工具，需要根据自己的开发版或目标环境确认。

tslib1.4执行环境配置

在/etc/profile增加如下配置

export TSLIB_ROOT=/opt/tslib1.4
export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_CONFFILE=$TSLIB_ROOT/etc/ts.conf
export TSLIB_PLUGINDIR=$TSLIB_ROOT/lib/ts
export TSLIB_CALIBFILE=$TSLIB_ROOT/etc/pointercal
export TSLIB_CONSOLEDEVICE=none
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TSLIB_ROOT/lib

TSLIB_ROOT指定更目录，更具目标开发版自行决定。
TSLIB_TSDEVICE指定触控出入硬件，在/dev目录查找，可用cat /dev/input/event0测试，测试时点击触摸屏终端有数据显示说明测试通过。
TSLIB_FBDEVICE指定framebuff
TSLIB_CONFFILE指定配置文件
TSLIB_PLUGINDIR指定触摸屏插件所在路径
TSLIB_CALIBFILE指定标定文件
TSLIB_CONSOLEDEVICE设定控制台设备为none
LD_LIBRARY_PATH更新加载库路径
参考：tslib移植中环境变量编辑

执行如下代码更新环境变量，或重启

source /etc/profile

tslib1.4的ts_calibrate执行屏幕无显示，其它测试程序执行也无显示问题处理

用export指令查看环境变量是否更新

export

用如下代码测试/dev/fb0是否正常工作

#include <stdio.h>  
#include <stdlib.h>  
#include <fcntl.h>  
#include <sys/mman.h>  
#include <linux/fb.h>  
  

#define COLOR24_RED 0x000000FF  
#define COLOR24_GREEN 0x0000FF00  
#define COLOR24_BLUE 0x00FF0000  

#define COLOR32_RED 0xFF0000FF  
#define COLOR32_GREEN 0xFF00FF00  
#define COLOR32_BLUE 0xFFFF0000   
  
int fdfb = -1;  
  
  
struct fb_fix_screeninfo fbfix = { 0 };  
struct fb_var_screeninfo fbvar = { 0 };  
long screensize = 0;  
  
  
int *fb32 = NULL;  
  
  
int x = 0;  
int y = 0;  
long location = 0;  
  
  
int main(int argc, char **argv)  
{  
	unsigned long c_red=COLOR24_RED;
	unsigned long c_green=COLOR24_GREEN;
	unsigned long c_blue=COLOR24_BLUE;
	// open framebuffer device  
	if(argc==1)
	{
		fdfb = open( "/dev/fb0", O_RDWR ); 
		if( 0 > fdfb ) {  
			printf("Failure to open framebuffer device: /dev/fb0 !\n");  
			exit( -1 );  
		}  
		printf("Success to open framebuffer device: /dev/fb0 !\n"); 
	}
	else
	{
		fdfb = open( argv[1], O_RDWR );  
		if( 0 > fdfb ) {  
			printf("Failure to open framebuffer device: %s !\n",argv[1]);  
			exit( -1 );  
		}  
		printf("Success to open framebuffer device: %s !\n",argv[1]);
	} 
  
	// get fixed screen information  
	if( ioctl( fdfb, FBIOGET_FSCREENINFO, &fbfix ) ) {  
		printf("Failure to get fixed screen information !\n");  
		exit( -2 );  
	}  
	printf("Success to get fixed screen information !\n");  
  
	// get varible screen information  
	if( ioctl( fdfb, FBIOGET_VSCREENINFO, &fbvar ) ) {  
		printf("Failure to get varible screen information !\n");  
		exit( -3 );  
	}  
	printf("Success to get varible screen information !\n");  
  
  
	// calculate the number of bytes for screen size  
	screensize = fbvar.xres * fbvar.yres * ( fbvar.bits_per_pixel / 8 );  
	printf("sceeninfo.xres = %d, screeninfo.yres = %d, screeninfo.bits_per_pixel = %dbpp, screensize = %d !\n", fbvar.xres, fbvar.yres, fbvar.bits_per_pixel, screensize);  

	// mmap framebuffer to process memory space  
	fb32 = (int *)mmap( 0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fdfb, 0 );  
	if( NULL == fb32 ) {  
		printf("Failure to map framebuffer device memory to process's memory !\n");  
		exit( -4 );  
	}  
	printf("Success to map framebuffer device memory to process's memory !\n");  

	// draw pixel  
	if( 8 == fbvar.bits_per_pixel ) {  
		printf("Starting 8 bpp framebuffer test...\n");  
	}  
	else if( 16 == fbvar.bits_per_pixel ) {  
		printf("Starting 16 bpp framebuffer test...\n");  
	}  
	else if( 24 == fbvar.bits_per_pixel ) {  
		c_red=COLOR24_RED;
		c_green=COLOR24_GREEN;
		c_blue=COLOR24_BLUE;
		printf("Starting 24 bpp framebuffer test...\n");  
	}  
	else{
		c_red=COLOR32_RED;
		c_green=COLOR32_GREEN;
		c_blue=COLOR32_BLUE;  
		printf("Supporting 32 bpp !\n");  
	}

	// draw red color area  
	printf("Starting to show RED area !\n");  
	for( y = 0; y < fbvar.yres / 3; y++ ) {  
		for( x = 0; x < fbvar.xres; x++ ) {  
			*( fb32 + y * fbvar.xres + x ) = c_red;  
		}  
	}
	getchar();  
  
	// draw green color area  
	printf("Starting to show GREEN area !\n");  
	for( y = ( fbvar.yres / 3 ); y < ( fbvar.yres * 2 / 3); y++ ) {  
		for( x = 0; x < fbvar.xres; x++ ) {  
			*( fb32 + y * fbvar.xres + x ) = c_green;  
		}  
	}  
	getchar();
 
	// draw blue color area   
	printf("Starting to show BLUE area !\n");  
	for( y = ( fbvar.yres * 2 / 3 ); y < fbvar.yres; y++ ) {  
		for( x = 0; x < fbvar.xres; x++ ) {  
			*( fb32 + y * fbvar.xres + x ) = c_blue;  
		}  
	}  
	getchar();    
  
	// unmap framebuffer memory  
	munmap( fb32, screensize );  
  
	printf("Finished to demo to operate framebuffer !\n");  
  
	// close device handle  
	close( fdfb );  
	return 0;  
}  

编译指令，根据自己交叉工具链更改

/home/toolchain/v7-toolchain/bin/arm-linux-gnueabi-gcc fb_test.c -o fb_test

目标板执行，注意添加可执行权限，chmod 777 ./fb_test

fb_test /dev/fb0

默认/dev/fb0可不用带参数，依次填充3蓝绿红三种颜色，按回车继续。
目标版执行结果如下：

Success to open framebuffer device: /dev/fb0 !
Success to get fixed screen information !
Success to get varible screen information !
sceeninfo.xres = 800, screeninfo.yres = 480, screeninfo.bits_per_pixel = 32bpp, screensize = 1536000 !
Success to map framebuffer device memory to process's memory !
Supporting 32 bpp !
Starting to show RED area !
Starting to show GREEN area !
Starting to show BLUE area !
Finished to demo to operate framebuffer !
Success to open framebuffer device: /dev/fb0 !
Success to get fixed screen information !
Success to get varible screen information !
sceeninfo.xres = 800, screeninfo.yres = 480, screeninfo.bits_per_pixel = 32bpp, screensize = 1536000 !
Success to map framebuffer device memory to process's memory !
Supporting 32 bpp !
Starting to show RED area !
Starting to show GREEN area !
Starting to show BLUE area !
Finished to demo to operate framebuffer

一开始目标板不正常工作，填充颜色都是黑色，查看screeninfo.bits_per_pixel = 32bpp, 目标版采用的32位颜色，更改测试代码如上，目标版工作正常。
tslib1.4也应当是只支持24位颜色，不支持32位颜色。开始调整tslib1.4代码。
注意32位颜色值一般这样分配：X8位，R8位，G8位，B8位或A8位，R8位，G8位，B8位。
参考：计算机颜色格式（ 8位 16位 24位 32位色）

分析tslib代码，发现设置颜色函数为

static inline void __setpixel (union multiptr loc, unsigned xormode, unsigned color)
{
	switch(bytes_per_pixel) {
	case 1:
	default:
		if (xormode)
			*loc.p8 ^= color;
		else
			*loc.p8 = color;
		break;
	case 2:
		if (xormode)
			*loc.p16 ^= color;
		else
			*loc.p16 = color;
		break;
	case 4:
		if (xormode)
			*loc.p32 ^= color;
		else
			*loc.p32 = color;
		break;
	}
}

修改为如下代码：

static inline void __setpixel (union multiptr loc, unsigned xormode, unsigned color)
{
	switch(bytes_per_pixel) {
	case 1:
	default:
		if (xormode)
			*loc.p8 ^= color;
		else
			*loc.p8 = color;
		break;
	case 2:
		if (xormode)
			*loc.p16 ^= color;
		else
			*loc.p16 = color;
		break;
	case 4:
		//if (xormode)
		//	*loc.p32 ^= color;
		//else
		//	*loc.p32 = color;
		//break;
		if (xormode)
			*loc.p32 =(*loc.p32^color)|0xff000000;
		else
			*loc.p32 = color|0xff000000;
		break;
	}
}

透明度置为0xff，24色直接赋值到32位色缺少了透明度数据，此时透明度数据是0，颜色或上0xff000000设置为不透明显示,重新编译，目标板测试，正常。

tslib1.4还有个open函数参数个数不兼容问题

具体在ts_calibrate.c文件main函数
原代码：

		if ((calfile = getenv("TSLIB_CALIBFILE")) != NULL) {
			cal_fd = open (calfile, O_CREAT | O_RDWR);
		} else {
			cal_fd = open ("/etc/pointercal", O_CREAT | O_RDWR);
		}

调整后代码：

		if ((calfile = getenv("TSLIB_CALIBFILE")) != NULL) {
			cal_fd = open (calfile, O_CREAT | O_RDWR,0777);
		} else {
			cal_fd = open ("/etc/pointercal", O_CREAT | O_RDWR,0777);
		}

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