R16 LCD Development
R16 LCD 开发
1.initial preparation work
前期准备工作
- Enter the tina SDK directory and configure the environment parameters.
进入tina SDK目录，并配置好环境参数。
cd ~/tinaV2.1
source build/envsetup.sh
lunch astar_parrot-tina
- Enter the configuration page
进入配置页面
make menuconfig
- Check the kernel module->video support->kmod-fb, kmod-sunxi-disp, kmod-lcd options
选择 fb sunxi-disp lcd三个驱动
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-J7dvmKzh-1598487968609)(https://i.loli.net/2020/08/26/Dqe8tkyYVPKji3R.jpg)]
- Check the freetype library
勾选freetype库
- Modify LCD hardware parameters
修改LCD的硬件参数
The path of the hardware parameter configuration file is as follows
/home/book/R16/tinaV2.1/target/allwinner/astar-parrot/configs/sys_config.fex
Modify according to the screen, mainly modify disp_init and lcd config
按照屏幕不同修改，主要是对disp_init和lcd config进行修改
- Burn to the development board after compilation
编译完后烧录到板子上
- Use ls /dev/ to check whether the driver is installed successfully
使用ls /dev 命令查看驱动是否安装成功
- Check whether the freetype library is successfully installed
查看freetype库是否安装成功
2.Display red pixels
显示红色像素点
- The source code is as follows
源码如下
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/fb.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
static int fd_fb;
static struct fb_var_screeninfo var; /* Current var */
static int screen_size;
static unsigned char *fb_base;
static unsigned int line_width;
static unsigned int pixel_width;
/**********************************************************************
* 函数名称： lcd_put_pixel
* 功能描述： 在LCD指定位置上输出指定颜色（描点）
* 输入参数： x坐标，y坐标，颜色
* 输出参数： 无
* 返 回 值： 会
* 修改日期 版本号 修改人 修改内容
* -----------------------------------------------
* 2020/08/18 V1.0 levi 创建
***********************************************************************/
void lcd_put_pixel(int x, int y, unsigned int color)
{
unsigned char *pen_8 = fb_base+y*line_width+x*pixel_width;
unsigned short *pen_16;
unsigned int *pen_32;
unsigned int red, green, blue;
pen_16 = (unsigned short *)pen_8;
pen_32 = (unsigned int *)pen_8;
switch (var.bits_per_pixel)
{
case 8:
{
*pen_8 = color;
break;
}
case 16:
{
/* 565 */
red = (color >> 16) & 0xff;
green = (color >> 8) & 0xff;
blue = (color >> 0) & 0xff;
color = ((red >> 3) << 11) | ((green >> 2) << 5) | (blue >> 3);
*pen_16 = color;
break;
}
case 32:
{
*pen_32 = color;
break;
}
default:
{
printf("can't surport %dbpp\n", var.bits_per_pixel);
break;
}
}
}
int main(int argc, char **argv)
{
int i,j;
fd_fb = open("/dev/fb0", O_RDWR);
if (fd_fb < 0)
{
printf("can't open /dev/fb0\n");
return -1;
}
if (ioctl(fd_fb, FBIOGET_VSCREENINFO, &var))
{
printf("can't get var\n");
return -1;
}
line_width = var.xres * var.bits_per_pixel / 8;
printf("var.xres=%u\n",var.xres);
printf("var.bits_per_pixel=%u\n",var.bits_per_pixel);
printf("var.yres=%u\n",var.yres);
printf("line_width=%u\n",line_width);
pixel_width = var.bits_per_pixel / 8;
printf("pixel_width=%u\n",pixel_width);
screen_size = var.xres * var.yres * var.bits_per_pixel / 8;
printf("screen_size=%d\n",screen_size);
fb_base = (unsigned char *)mmap(NULL , screen_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd_fb, 0);
if (fb_base == (unsigned char *)-1)
{
printf("can't mmap\n");
return -1;
}
/* 清屏: 全部设为白色 */
memset(fb_base, 0xff, screen_size);
/* 随便设置出100个为红色 */
for (j = 0; j< 100; j++)
{
for (i = 0; i < 100; i++)
lcd_put_pixel(var.xres/2+i, var.yres/2+j, 0xFFddee);
}
munmap(fb_base , screen_size);
close(fd_fb);
return 0;
}
- Compile and test
编译并测试
- The compile and pull script is as follows
编译和上传的脚本如下
#!/bin/bash
arm-openwrt-linux-muslgnueabi-gcc -o show_pixel show_pixel.c
adb push show_pixel /tmp/
- Run on development board
开发板上运行
root@TinaLinux:/tmp# ./show_pixel
- View effect
查看效果
3.Show two lines
显示两行字
- The source code is as follows
源码如下
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <linux/fb.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <wchar.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
typedef struct TGlyph_ {
FT_UInt index; /* glyph index */
FT_Vector pos; /* glyph origin on the baseline */
FT_Glyph image; /* glyph image */
} TGlyph, *PGlyph;
#define MAX_GLYPHS 100
int fd_fb;
struct fb_var_screeninfo var; /* Current var */
struct fb_fix_screeninfo fix; /* Current fix */
int screen_size;
unsigned char *fbmem;
unsigned int line_width;
unsigned int pixel_width;
/* color : 0x00RRGGBB */
void lcd_put_pixel(int x, int y, unsigned int color)
{
unsigned char *pen_8 = fbmem+y*line_width+x*pixel_width;
unsigned short *pen_16;
unsigned int *pen_32;
unsigned int red, green, blue;
pen_16 = (unsigned short *)pen_8;
pen_32 = (unsigned int *)pen_8;
switch (var.bits_per_pixel)
{
case 8:
{
*pen_8 = color;
break;
}
case 16:
{
/* 565 */
red = (color >> 16) & 0xff;
green = (color >> 8) & 0xff;
blue = (color >> 0) & 0xff;
color = ((red >> 3) << 11) | ((green >> 2) << 5) | (blue >> 3);
*pen_16 = color;
break;
}
case 32:
{
*pen_32 = color;
break;
}
default:
{
printf("can't surport %dbpp\n", var.bits_per_pixel);
break;
}
}
}
/* Replace this function with something useful. */
void
draw_bitmap( FT_Bitmap* bitmap,
FT_Int x,
FT_Int y)
{
FT_Int i, j, p, q;
FT_Int x_max = x + bitmap->width;
FT_Int y_max = y + bitmap->rows;
//printf("x = %d, y = %d\n", x, y);
for ( i = x, p = 0; i < x_max; i++, p++ )
{
for ( j = y, q = 0; j < y_max; j++, q++ )
{
if ( i < 0 || j < 0 ||
i >= var.xres || j >= var.yres )
continue;
//image[j][i] |= bitmap->buffer[q * bitmap->width + p];
lcd_put_pixel(i, j, bitmap->buffer[q * bitmap->width + p]);
}
}
}
int Get_Glyphs_Frm_Wstr(FT_Face face, wchar_t * wstr, TGlyph glyphs[])
{
int n;
PGlyph glyph = glyphs;
int pen_x = 0;
int pen_y = 0;
int error;
FT_GlyphSlot slot = face->glyph;;
for (n = 0; n < wcslen(wstr); n++)
{
glyph->index = FT_Get_Char_Index( face, wstr[n]);
/* store current pen position */
glyph->pos.x = pen_x;
glyph->pos.y = pen_y;
/* load时是把glyph放入插槽face->glyph */
error = FT_Load_Glyph(face, glyph->index, FT_LOAD_DEFAULT);
if ( error )
continue;
error = FT_Get_Glyph(face->glyph, &glyph->image );
if ( error )
continue;
/* translate the glyph image now */
/* 这使得glyph->image里含有位置信息 */
FT_Glyph_Transform(glyph->image, 0, &glyph->pos );
pen_x += slot->advance.x; /* 1/64 point */
/* increment number of glyphs */
glyph++;
}
/* count number of glyphs loaded */
return (glyph - glyphs);
}
void compute_string_bbox(TGlyph glyphs[], FT_UInt num_glyphs, FT_BBox *abbox )
{
FT_BBox bbox;
int n;
bbox.xMin = bbox.yMin = 32000;
bbox.xMax = bbox.yMax = -32000;
for ( n = 0; n < num_glyphs; n++ )
{
FT_BBox glyph_bbox;
FT_Glyph_Get_CBox(glyphs[n].image, FT_GLYPH_BBOX_TRUNCATE, &glyph_bbox );
if (glyph_bbox.xMin < bbox.xMin)
bbox.xMin = glyph_bbox.xMin;
if (glyph_bbox.yMin < bbox.yMin)
bbox.yMin = glyph_bbox.yMin;
if (glyph_bbox.xMax > bbox.xMax)
bbox.xMax = glyph_bbox.xMax;
if (glyph_bbox.yMax > bbox.yMax)
bbox.yMax = glyph_bbox.yMax;
}
*abbox = bbox;
}
void Draw_Glyphs(TGlyph glyphs[], FT_UInt num_glyphs, FT_Vector pen)
{
int n;
int error;
for (n = 0; n < num_glyphs; n++)
{
FT_Glyph_Transform(glyphs[n].image, 0, &pen);
/* convert glyph image to bitmap (destroy the glyph copy!) */
error = FT_Glyph_To_Bitmap(&glyphs[n].image, FT_RENDER_MODE_NORMAL, 0, /* no additional translation */
1 ); /* destroy copy in "image" */
if ( !error )
{
FT_BitmapGlyph bit = (FT_BitmapGlyph)glyphs[n].image;
draw_bitmap(&bit->bitmap, bit->left, var.yres - bit->top);
FT_Done_Glyph(glyphs[n].image );
}
}
}
int main(int argc, char **argv)
{
wchar_t *wstr1 = L"富利凯医疗用品有限公司Flexicare";
wchar_t *wstr2 = L"www.flexicare.com";
FT_Library library;
FT_Face face;
int error;
FT_Vector pen;
FT_GlyphSlot slot;
int i;
FT_BBox bbox;
int line_box_ymin = 10000;
int line_box_ymax = 0;
int line_box_width;
int line_box_height;
TGlyph glyphs[MAX_GLYPHS]; /* glyphs table */
FT_UInt num_glyphs;
if (argc != 2)
{
printf("Usage : %s <font_file>\n", argv[0]);
return -1;
}
fd_fb = open("/dev/fb0", O_RDWR);
if (fd_fb < 0)
{
printf("can't open /dev/fb0\n");
return -1;
}
if (ioctl(fd_fb, FBIOGET_VSCREENINFO, &var))
{
printf("can't get var\n");
return -1;
}
if (ioctl(fd_fb, FBIOGET_FSCREENINFO, &fix))
{
printf("can't get fix\n");
return -1;
}
line_width = var.xres * var.bits_per_pixel / 8;
pixel_width = var.bits_per_pixel / 8;
screen_size = var.xres * var.yres * var.bits_per_pixel / 8;
fbmem = (unsigned char *)mmap(NULL , screen_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd_fb, 0);
if (fbmem == (unsigned char *)-1)
{
printf("can't mmap\n");
return -1;
}
/* 清屏: 全部设为黑色 */
memset(fbmem, 0, screen_size);
/* 显示矢量字体 */
error = FT_Init_FreeType( &library ); /* initialize library */
/* error handling omitted */
error = FT_New_Face( library, argv[1], 0, &face ); /* create face object */
/* error handling omitted */
slot = face->glyph;
FT_Set_Pixel_Sizes(face, 24, 0);
/* wstr1 */
num_glyphs = Get_Glyphs_Frm_Wstr(face, wstr1, glyphs);
compute_string_bbox(glyphs, num_glyphs, &bbox);
line_box_width = bbox.xMax - bbox.xMin;
line_box_height = bbox.yMax - bbox.yMin;
pen.x = (var.xres - line_box_width)/2 * 64;
pen.y = (var.yres - line_box_height)/2 * 64;
Draw_Glyphs(glyphs, num_glyphs, pen);
/* wstr2 */
num_glyphs = Get_Glyphs_Frm_Wstr(face, wstr2, glyphs);
compute_string_bbox(glyphs, num_glyphs, &bbox);
line_box_width = bbox.xMax - bbox.xMin;
line_box_height = bbox.yMax - bbox.yMin;
pen.x = (var.xres - line_box_width)/2 * 64;
pen.y = pen.y - 24 * 64;
Draw_Glyphs(glyphs, num_glyphs, pen);
return 0;
}
- Compile and test
编译并测试
- The compile and pull script is as follows
编译和上传的脚本如下
#!/bin/bash
arm-openwrt-linux-muslgnueabi-gcc -finput-charset=GBK -o show_lines show_lines.c -lfreetype -lm
adb push show_lines /tmp/
adb push simsun.ttc /tmp/
- Run on development board
开发板上运行
root@TinaLinux:/tmp# ./show_lines simsun.ttc
- View effect
查看效果
4.Show file
显示文件
- The source code path is as follows
源码位置如下
https://github.com/LeviLuoLL/R16/tree/master/Lcd_Test/show_file_final
- Compile and test
编译并测试
- makefile is as follow
makefile 如下
CROSSCOMPILE := arm-openwrt-linux-
CFLAGS := -Wall -O2 -c
CFLAGS += -I$(PWD)/include
LDFLAGS := -lm -lfreetype
CC := $(CROSSCOMPILE)muslgnueabi-gcc
LD := $(CROSSCOMPILE)ld
OBJS := main.o \
display/disp_manager.o \
display/fb.o \
encoding/ascii.o \
encoding/utf-16be.o \
encoding/encoding_manager.o \
encoding/utf-8.o \
encoding/utf-16le.o \
draw/draw.o \
fonts/ascii.o \
fonts/gbk.o \
fonts/freetype.o \
fonts/fonts_manager.o
all: $(OBJS)
$(CC) $(LDFLAGS) -o show_file $^
clean:
rm -f show_file
rm -f $(OBJS)
%.o:%.c
$(CC) $(CFLAGS) -o $@ $<
- Run on development board
开发板上运行
root@TinaLinux:/levi/show_file# ./show_file -s 128 -d fb -f ../simsun.ttc ./text
.txt
- View effect
查看效果
5.Show picture
显示图片
- The source code is as follows
源码如下
#include <stdio.h>
#include "jpeglib.h"
#include <setjmp.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/fb.h>
#include <string.h>
#include <stdlib.h>
#define FB_DEVICE_NAME "/dev/fb0"
#define DBG_PRINTF printf
static int g_fd;
static struct fb_var_screeninfo g_tFBVar;
static struct fb_fix_screeninfo g_tFBFix;
static unsigned char *g_pucFBMem;
static unsigned int g_dwScreenSize;
static unsigned int g_dwLineWidth;
static unsigned int g_dwPixelWidth;
static int FBDeviceInit(void)
{
int ret;
g_fd = open(FB_DEVICE_NAME, O_RDWR);
if (0 > g_fd)
{
DBG_PRINTF("can't open %s\n", FB_DEVICE_NAME);
}
ret = ioctl(g_fd, FBIOGET_VSCREENINFO, &g_tFBVar);
if (ret < 0)
{
DBG_PRINTF("can't get fb's var\n");
return -1;
}
ret = ioctl(g_fd, FBIOGET_FSCREENINFO, &g_tFBFix);
if (ret < 0)
{
DBG_PRINTF("can't get fb's fix\n");
return -1;
}
g_dwScreenSize = g_tFBVar.xres * g_tFBVar.yres * g_tFBVar.bits_per_pixel / 8;
g_pucFBMem = (unsigned char *)mmap(NULL , g_dwScreenSize, PROT_READ | PROT_WRITE, MAP_SHARED, g_fd, 0);
if (0 > g_pucFBMem)
{
DBG_PRINTF("can't mmap\n");
return -1;
}
g_dwLineWidth = g_tFBVar.xres * g_tFBVar.bits_per_pixel / 8;
g_dwPixelWidth = g_tFBVar.bits_per_pixel / 8;
return 0;
}
static int FBShowPixel(int iX, int iY, unsigned int dwColor)
{
unsigned char *pucFB;
unsigned short *pwFB16bpp;
unsigned int *pdwFB32bpp;
unsigned short wColor16bpp; /* 565 */
int iRed;
int iGreen;
int iBlue;
if ((iX >= g_tFBVar.xres) || (iY >= g_tFBVar.yres))
{
DBG_PRINTF("out of region\n");
return -1;
}
pucFB = g_pucFBMem + g_dwLineWidth * iY + g_dwPixelWidth * iX;
pwFB16bpp = (unsigned short *)pucFB;
pdwFB32bpp = (unsigned int *)pucFB;
switch (g_tFBVar.bits_per_pixel)
{
case 8:
{
*pucFB = (unsigned char)dwColor;
break;
}
case 16:
{
iRed = (dwColor >> (16+3)) & 0x1f;
iGreen = (dwColor >> (8+2)) & 0x3f;
iBlue = (dwColor >> 3) & 0x1f;
wColor16bpp = (iRed << 11) | (iGreen << 5) | iBlue;
*pwFB16bpp = wColor16bpp;
break;
}
case 32:
{
*pdwFB32bpp = dwColor;
break;
}
default :
{
DBG_PRINTF("can't support %d bpp\n", g_tFBVar.bits_per_pixel);
return -1;
}
}
return 0;
}
static int FBCleanScreen(unsigned int dwBackColor)
{
unsigned char *pucFB;
unsigned short *pwFB16bpp;
unsigned int *pdwFB32bpp;
unsigned short wColor16bpp; /* 565 */
int iRed;
int iGreen;
int iBlue;
int i = 0;
pucFB = g_pucFBMem;
pwFB16bpp = (unsigned short *)pucFB;
pdwFB32bpp = (unsigned int *)pucFB;
switch (g_tFBVar.bits_per_pixel)
{
case 8:
{
memset(g_pucFBMem, dwBackColor, g_dwScreenSize);
break;
}
case 16:
{
iRed = (dwBackColor >> (16+3)) & 0x1f;
iGreen = (dwBackColor >> (8+2)) & 0x3f;
iBlue = (dwBackColor >> 3) & 0x1f;
wColor16bpp = (iRed << 11) | (iGreen << 5) | iBlue;
while (i < g_dwScreenSize)
{
*pwFB16bpp = wColor16bpp;
pwFB16bpp++;
i += 2;
}
break;
}
case 32:
{
while (i < g_dwScreenSize)
{
*pdwFB32bpp = dwBackColor;
pdwFB32bpp++;
i += 4;
}
break;
}
default :
{
DBG_PRINTF("can't support %d bpp\n", g_tFBVar.bits_per_pixel);
return -1;
}
}
return 0;
}
static int FBShowLine(int iXStart, int iXEnd, int iY, unsigned char *pucRGBArray)
{
int i = iXStart * 3;
int iX;
unsigned int dwColor;
if (iY >= g_tFBVar.yres)
return -1;
if (iXStart >= g_tFBVar.xres)
return -1;
if (iXEnd >= g_tFBVar.xres)
{
iXEnd = g_tFBVar.xres;
}
for (iX = iXStart; iX < iXEnd; iX++)
{
/* 0xRRGGBB */
dwColor = (pucRGBArray[i]<<16) + (pucRGBArray[i+1]<<8) + (pucRGBArray[i+2]<<0);
i += 3;
FBShowPixel(iX, iY, dwColor);
}
return 0;
}
/*
Allocate and initialize a JPEG decompression object // 分配和初始化一个decompression结构体
Specify the source of the compressed data (eg, a file) // 指定源文件
Call jpeg_read_header() to obtain image info // 用jpeg_read_header获得jpg信息
Set parameters for decompression // 设置解压参数,比如放大、缩小
jpeg_start_decompress(...); // 启动解压：jpeg_start_decompress
while (scan lines remain to be read)
jpeg_read_scanlines(...); // 循环调用jpeg_read_scanlines
jpeg_finish_decompress(...); // jpeg_finish_decompress
Release the JPEG decompression object // 释放decompression结构体
*/
/* Uage: jpg2rgb <jpg_file>
*/
int main(int argc, char **argv)
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE * infile;
int row_stride;
unsigned char *buffer;
if (argc != 2)
{
printf("Usage: \n");
printf("%s <jpg_file>\n", argv[0]);
return -1;
}
if (FBDeviceInit())
{
return -1;
}
FBCleanScreen(0);
// 分配和初始化一个decompression结构体
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
// 指定源文件
if ((infile = fopen(argv[1], "rb")) == NULL) {
fprintf(stderr, "can't open %s\n", argv[1]);
return -1;
}
jpeg_stdio_src(&cinfo, infile);
// 用jpeg_read_header获得jpg信息
jpeg_read_header(&cinfo, TRUE);
/* 源信息 */
printf("image_width = %d\n", cinfo.image_width);
printf("image_height = %d\n", cinfo.image_height);
printf("num_components = %d\n", cinfo.num_components);
// 设置解压参数,比如放大、缩小
printf("enter scale M/N:\n");
scanf("%d/%d", &cinfo.scale_num, &cinfo.scale_denom);
printf("scale to : %d/%d\n", cinfo.scale_num, cinfo.scale_denom);
// 启动解压：jpeg_start_decompress
jpeg_start_decompress(&cinfo);
/* 输出的图象的信息 */
printf("output_width = %d\n", cinfo.output_width);
printf("output_height = %d\n", cinfo.output_height);
printf("output_components = %d\n", cinfo.output_components);
// 一行的数据长度
row_stride = cinfo.output_width * cinfo.output_components;
buffer = malloc(row_stride);
// 循环调用jpeg_read_scanlines来一行一行地获得解压的数据
while (cinfo.output_scanline < cinfo.output_height)
{
(void) jpeg_read_scanlines(&cinfo, &buffer, 1);
// 写到LCD去
FBShowLine(0, cinfo.output_width, cinfo.output_scanline, buffer);
}
free(buffer);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return 0;
}
- Compile and test
编译并测试
- The compile and pull script is as follows
编译和上传的脚本如下
#!/bin/bash
arm-openwrt-linux-muslgnueabi-gcc -o jpg2rgb jpg2rgb.c -ljpeg
adb push jpg2rgb /tmp/
- Run on development board
开发板上运行
root@TinaLinux:/levi/show_pic# ./jpg2rgb flexicare.jpg
image_width = 1024
image_height = 600
num_components = 3
enter scale M/N:
1/1
scale to : 1/1
output_width = 1024
output_height = 600
output_components = 3
- View effect
查看效果
.output_width * cinfo.output_components;
buffer = malloc(row_stride);
// 循环调用jpeg_read_scanlines来一行一行地获得解压的数据
while (cinfo.output_scanline < cinfo.output_height)
{
(void) jpeg_read_scanlines(&cinfo, &buffer, 1);
// 写到LCD去
FBShowLine(0, cinfo.output_width, cinfo.output_scanline, buffer);
}
free(buffer);
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return 0;
}
- **Compile and test**
> 编译并测试
- **The compile and pull script is as follows**
> 编译和上传的脚本如下
```shell
#!/bin/bash
arm-openwrt-linux-muslgnueabi-gcc -o jpg2rgb jpg2rgb.c -ljpeg
adb push jpg2rgb /tmp/
- Run on development board
开发板上运行
root@TinaLinux:/levi/show_pic# ./jpg2rgb flexicare.jpg
image_width = 1024
image_height = 600
num_components = 3
enter scale M/N:
1/1
scale to : 1/1
output_width = 1024
output_height = 600
output_components = 3
- View effect
查看效果
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