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一个用两个IO驱动LCD1206显示的超牛方案
明亮
posted @ 2011年3月16日 17:45
in 【科学综合】
, 3537 阅读
本文发表于：http://fml927.is-programmer.com
整理自：http://www.ourdev.cn/bbs/bbs_content.jsp?bbs_sn=4301955&bbs_page_no=1&bbs_id=9999
1、完成结果展示图：
增加了“无线馈电及传送数据”部分的电路展示：
电路图如下，仔细观察可以发现实物图中有几个贴片的阻容件，秘密就在这里，利用电容的记忆效应，把串行的数据转为并行。
示范程序如下比较简单，不用多注释应该都能看懂。作为演示用途，其中有些长时间延时没有没有使用定时器，在多任务系统中当然要用定时中断来代替了。
// Drive a LCD1602 with 2 wire //=================================================== //ICC-AVR application builder : 2010-10-3 19:30:02 // Target : M16 // Crystal: 4.0000Mhz #include <iom16v.h> #include <macros.h> #define Set_E PORTB|=2 #define Clr_E PORTB&=~2 #define Set_D PORTB|=1 #define Clr_D PORTB&=~1 #define Set_xy(y,x) Send(0,(y<<6)|(x&15)|0x80) //=================================================== void init_devices(void) { CLI(); //disable all interrupts DDRB = 0x03; MCUCR = 0x00; GICR = 0x00; SEI(); //re-enable interrupts } //=================================================== void Delay(unsigned int i) { while(i--); } //=================================================== void Send(unsigned char RS, unsigned char dat) { unsigned char i; for (i = 2; i > 0; i--) { if (dat & 0x80) Set_D; else Clr_D; Delay(10608);//14520us if (RS) Set_E; if (dat & 0x40) Set_D; else Clr_D; Delay(462); //660us if (dat & 0x20) Set_D; else Clr_D; Delay(18); //30us Set_E; if (dat & 0x10) Set_D; else Clr_D; _NOP(); //0.5us < t < 1.36us Clr_E; dat <<= 4; } } //=================================================== void init_1602(void) { unsigned char i = 3; Clr_D; Clr_E; Delay(10608); do{ Clr_D; Delay(462); Set_D; Set_E; Delay(18); if (i == 0) Clr_D; _NOP();_NOP();_NOP(); Clr_E; }while(i--); Send(0,0x28); Send(0,0x01); Send(0,0x0f); } //=================================================== void Send_S(unsigned char *p) { while(*p) Send(1,*p++); } //=================================================== void main(void) { unsigned char i; init_devices(); init_1602(); Set_xy(0,2); Send_S("Hello world!"); Set_xy(1,3); Send_S("I'm COWBOY."); for (i=0;i<255;i++) Delay(10000); Send(0,0x01); Set_xy(0,3); Send_S("Welcome to"); Set_xy(1,1); Send_S("www.ourdev.cn"); while(1); }
后记：这个设计的突出特点部分是串并转换的思想和设计电路，虽然从运行时间上、稳定性上将不太可取，但是，这个设计方法可以在很多地方用到，还有就是这个作者敢想、敢做。要是真的需要很少的引脚来控制LCD的话，我宁肯选择一个带SPI接口的LCD，可定比这个方案稳定、快速。
2024年1月22日 15:34
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