本帖最后由 AllBlue 于 2016-9-30 13:43 编辑
驱动12864液晶
12864是128*64点阵液晶模块的点阵数简称,业界约定俗成的简称。主要控制芯片一般为ST7920或与之兼容的IC。 大家在网上搜索12864时,总会发现带不带字库,它们的分别:带字库版不需要用点阵生成器把汉字变成点阵后再输入,直接输入汉字内码即可显示出对应汉字,无字库版想要显示汉字,只能自己按照点阵方式驱动。 硬件特性: 提供 8 位,4 位并行接口及串行接口可选 并行接口适配 M6800 时序 自动电源启动复位功能 内部自建振荡源 64×16 位字符显示 RAM(DDRAM 最多 16 字符×4 行,LCD 显示范围 16×2 行) 2M 位中文字型 ROM(CGROM),总共提供 8192 个中文字型(16×16 点阵) 16K 位半宽字型 ROM(HCGROM),总共提供 126 个西文字型(16×8 点阵) 64×16 位字符产生 RAM(CGRAM) 引脚功能图:
详细资料可以下载下面的12864手册;
12864液晶手册:
下图就是12864液晶的实物图了:
、
上面说过12864的连接方法: 8 位,4 位并行接口及串行接口可选 。串行接法
电路示意图如下:
实物连接图如下:
12864库文件:
例程:[C] 纯文本查看 复制代码 /*
Arduino驱动LCD12864显示
BY YFRobot
*/
#include "LCD12864RSPI.h"
#define AR_SIZE( a ) sizeof( a ) / sizeof( a[0] )
unsigned char show0[]="YFROBOT"; //YFROBOT
unsigned char show1[]= { 0xB9, 0xA4, 0xD7, 0xF7, 0xCA, 0xD2 }; //工作室
unsigned char show2[]="Touch You Future"; //Touch You Future
unsigned char logo[] = // 扬帆Logo
{
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x0F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,
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0xFF,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,
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0xFE,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x3F,0xFF,
0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};
void setup(){
LCDA.Initialise(); // 屏幕初始化
delay(100);
}
void LOGO(){
LCDA.CLEAR();//清屏
delay(100);
LCDA.DrawFullScreen(logo); //全屏显示logo
}
void NAME(){
LCDA.CLEAR();//清屏
delay(100);
LCDA.DisplayString(0,0,show0,AR_SIZE(show0));//第一行第一格开始,显示"YFROBOT"
delay(100);
LCDA.DisplayString(0,4,show1,AR_SIZE(show1));//第一行第五个字开始,显示文字"工作室"
delay(100);
LCDA.DisplayString(2,0,show2,AR_SIZE(show2));//第三行第一格开始,显示"Touch You Future"
}
void loop(){
LOGO();
delay(3000);
NAME();
delay(3000);
}
显示效果:
还有并行接法,由于篇幅太大,我们下次贴给大家介绍!
上面的效果图如何获得的呢?首先英文字母不需要麻烦,直接输出就可以;然后介绍下如何获取汉字内码,我们打开汉字内码获取工具(由ardyPro所写,很好用;本帖也有下载链接),然后输入想要显示的汉字,例如:“工作室”;点击转换,转换结果就会出现内码了,如下图,其中“0xB9, 0xA4,”就是“共”字的内码,将其复制到程序中就可以使用了~~
汉字一个字占两个字符,相当于两个英文字母的大小,所以我们程序中LCDA.DisplayString(0,4,show1,AR_SIZE(show1));//第一行第五个字开始,显示文字"工作室" 的语句是从第五个字开始显示,因为“YFROBOT”占用了7个字符,就相当于占用了4个汉字的位置!
下面我来介绍下图片是如何获取的,你需要个图片取模工具(本帖最后有下载链接),打开它,然后找到你想要显示的图片,这里我就以上面程序中的图片为例了!
图片如下:
然后我们通过PS软件打开它;再在PS中新建一个128*64的空白图片:
然后我们将我们的图片经过一些处理:将其尺寸改小,能拖到128*64的空白图片中就可以,我们原图的尺寸为1181*1181,所以我将其改为64*64,这样肯定可以拖到128*64图片中,用户在使用其他尺寸图片时原理一样的,如果你想要显示的大点,那你就让图片的边缘接近128*64的大小就可以了!我们看下我们改好的图片(下图中已经将原图改小并且已经将其拖入128*64空白图片中,图中能看到的就是128*64图片的现状):
现在来说原图已经没什么作用了,可以将其关闭,它的大小有改动,关闭是可以还原它的大小选择不更改图片就可以;
下面我们要做的就是讲图片改成取模工具能够识别的图片就可以了,但要经过几个步骤;
第一步:去色(如果原图是黑白的更好就不需要这个步骤了) 第二步:调节对比度(为了更清楚的显示) 第三步:调节图片模式(从原来的RGB颜色改为位图,其中可能不能直接改为位图,要先改为灰度);下图为从灰度状态改为位图时弹出的对话框,选择“50% 阈值”,这个出来的效果相对比较好。
这样我们的图片就完成了,看下效果吧!(下图为原图和效果图的对比,图中虽然两个图片差不多大小但是它们的实际大小差很多的)原图尺寸(左):1181*1181 效果图尺寸(右):128*64 记得将效果图保存,格式为BMP
下面我们打开图片取模工具,设置“C语言”、“输出大小:X为128,Y为64”,然后点击“载入图片”,载入我们已经处理好的图片,如下图(关键参数已经用红框标出,如果图片黑白相反,可以勾选输出大小下方的“黑白取反”,然后再次载入图片):
如果对载入的图片不满意,还可以自己进行修改,鼠标左键为加黑点,右键为去黑点!! 在确定好图片之后,点击“数据保存”保存为“.h”格式。然后打开你保存的“XXXX.h”文件,文件中的数组(类似下图)就是我们想要的东西了,将它复制到程序中,就可以显示刚才处理的图片了!!!!
图片取模工具:
汉字内码获取工具:
扩展阅读:
另一个字模提取工具:
楼主自己弄着玩的图片,还不错:
8位并行接法
8位并行连接示意图:
库文件:更新后库文件:
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