LCD_driver.zip_LCD driver_直接驱动

/*分享:HT46R94 直接驱动 1/2 BIAS LCD 显示屏的完整C语言源代码 张贴于: 23 Apr 2009 10:36 PM ====调试了三天, 终于给我调试出来了,呵呵,谢谢HT的宋工==== 实验: HT46R94 直接驱动 1/2 BIAS, 4COM, 12SEG LCD 显示屏 MCU: Holtek HT46R94 仿真器+接口卡 IDE: HT-IDE3000 V7.0 Beta build 1105 编译器: 选择 Enhanced Holtek C Compiler/Assembler @author: JimmyChen, jimweaver@126.com @modified: 2009-04-22 15:22 */ /* 根据 Holtek 网站 App Notes "ha0168s" 中的 Format 2 汇编代码改编 Configuration Options: 时基中断频率=fs/2^5, 其余采用默认设置 实测结果: LCD 显示正常, 十进制计数器 */ #include "HT46R94.h" //LCD引脚定义 //SEG引脚 #define LCD_SEG0 _pc0 #define LCD_SEG1 _pc1 #define LCD_SEG2 _pc2 #define LCD_SEG3 _pc3 #define LCD_SEG4 _pe0 #define LCD_SEG5 _pe1 #define LCD_SEG6 _pe2 #define LCD_SEG7 _pe3 #define LCD_SEG8 _pe4 #define LCD_SEG9 _pe5 #define LCD_SEG10 _pe6 #define LCD_SEG11 _pd0 //COM引脚 #define LCD_COM0 _pc4 #define LCD_COM1 _pc5 #define LCD_COM2 _pc6 #define LCD_COM3 _pc7 #pragma vector isr_timebase @ 0x10 //时基中断向量, 0x0c if HT46R92 // bit display_flag; //是否刷新显示的标志 unsigned char com_pulse; //COM扫描周期循环计数器,一个扫描周期=8次中断 unsigned char count[6]; //待显示的数值 unsigned char display_codes[6]; //显示缓冲区,存放待显示的数值的段位码 unsigned char time_count; //时基中断计数器 //LCD显示屏对应的段位码表 const unsigned char lcd_table[] = { 0x5f, //0, LCD段位码格式为: D7~D0=(P,E,G,F,D,C,B,A) 0x06, //1 0x6b, //2 0x2f, //3 0x36, //4 0x3d, //5 0x7d, //6 0x07, //7 0x7f, //8 0x3f, //9 0x77, //A 0x7c, //b 0x59, //C 0x6e, //d 0x79, //E 0x71, //F 0x58, //L, index:0x10 0x76, //H, index:0x11 0xff, //全亮, index:0x12 0x00 //空白, index:0x13 }; const unsigned char LCDC_MASKS[] = { //LCDC寄存器设置掩码 0x3e, //11111110, rsel=1, lcden=1, com0en=0 0x3d, //11111101, rsel=1, lcden=1, com1en=0 0x3b, //11111011, rsel=1, lcden=1, com2en=0 0x37 //11110111, rsel=1, lcden=1, com3en=0 }; void isr_timebase(void) { //时基中断 display_flag = 1; com_pulse++; time_count++; } void get_display_number(); void init() { //复位初始值: PA=0xff,PAC=0xff,PB=0xff,PBC=0xff //PC=0x00,PD=0xff,PE=0xff,LCDC=0x00 _pd0 = 0;//LCD_SEG11 _pe = 0;//LCD_SEG10 ~ LCD_SEG4 display_flag = 0; com_pulse = 0; time_count = 0; //初始化计数器各位 count[0] = 0; count[1] = 0; count[2] = 0; count[3] = 0; count[4] = 0; count[5] = 0; //初始化 Timebase // _etbi = 1;//时基中断 _emi = 1;//开中断 //_lcdc = 0b00011111;//b5=rsel:0,选择2x100k偏压电阻;b4=lcden:1,使能LCD;b3~b0:强制COM输出VDD/2 /* rsel: Select resistor for R type LCD bias current: 1: 2x50k(1/2bias),Ibias=50uA at Vdd=5V 0: 2x100k(1/2bias),Ibias=25uA at Vdd=5V */ _rsel = 0; //选择2x100k偏压电阻 _lcden = 1; //使能LCD驱动 } //set com0~com3 && segments output void lcd_display() { unsigned char mask, i; display_flag = 0; //分 8 拍依次设置COM0~3的输出，每个SEG引脚输出VDD还是输出VSS需要根据要显示的数字判断 //先产生COMs,再产生SEGs if(com_pulse < 5) { //扫描周期之1~4拍 //前4拍: COM0=1 -> COM1=1 -> COM2=1 -> COM3=1, 其余COM?=VDD/2, 若要亮某点: SEG?=0 mask = LCDC_MASKS[com_pulse - 1]; _lcdc = mask;//设置COM引脚状态 LCD_COM0 = 1; LCD_COM1 = 1; LCD_COM2 = 1; LCD_COM3 = 1; //产生SEGs, 若要亮某点: SEG?=0 //if display_codes[0].0 == 1 then seg0 = 0 else seg0 = 1 //if((display_codes[0] && 0x01)) LCD_SEG0 = 0; else LCD_SEG0 = 1; LCD_SEG0 = !(display_codes[0] & 0x10);//D4 LCD_SEG1 = !(display_codes[0] & 0x01);//D0 LCD_SEG2 = !(display_codes[1] & 0x10);//D4 LCD_SEG3 = !(display_codes[1] & 0x01);//D0 LCD_SEG4 = !(display_codes[2] & 0x10);//D4 LCD_SEG5 = !(display_codes[2] & 0x01);//D0 LCD_SEG6 = !(display_codes[3] & 0x10);//D4 LCD_SEG7 = !(display_codes[3] & 0x01);//D0 LCD_SEG8 = !(display_codes[4] & 0x10);//D4 LCD_SEG9 = !(display_codes[4] & 0x01);//D0 LCD_SEG10 = !(display_codes[5] & 0x10);//D4 LCD_SEG11 = !(display_codes[5] & 0x01);//D0 } else { //扫描周期之5~8拍 //后4拍: COM0=0 -> COM1=0 -> COM2=0 -> COM3=0, 其余COM?=VDD/2, 若要亮某点: SEG?=1 if (com_pulse == 5) { //第5拍时,要把前面4拍4次循环右移后的值,通过调换高低4位来恢复原状 _swap(&display_codes[0]); _swap(&display_codes[1]); _swap(&display_codes[2]); _swap(&display_codes[3]); _swap(&display_codes[4]); _swap(&display_codes[5]); } mask = LCDC_MASKS[com_pulse - 5]; _lcdc = mask;//设置COM引脚状态 LCD_COM0 = 0; LCD_COM1 = 0; LCD_COM2 = 0; LCD_COM3 = 0; //产生SEGs, 若要亮某点: SEG?=1 //if display_codes[0].0 == 1 then seg0 = 1 else seg0 = 0 LCD_SEG0 = (display_codes[0] & 0x10);//D4 LCD_SEG1 = (display_codes[0] & 0x01);//D0 LCD_SEG2 = (display_codes[1] & 0x10);//D4 LCD_SEG3 = (display_codes[1] & 0x01);//D0 LCD_SEG4 = (display_codes[2] & 0x10);//D4 LCD_SEG5 = (display_codes[2] & 0x01);//D0 LCD_SEG6 = (display_codes[3] & 0x10);//D4 LCD_SEG7 = (display_codes[3] & 0x01);//D0 LCD_SEG8 = (display_codes[4] & 0x10);//D4 LCD_SEG9 = (display_codes[4] & 0x01);//D0 LCD_SEG10 = (display_codes[5] & 0x10);//D4 LCD_SEG11 = (display_codes[5] & 0x01);//D0 } //将各个段位码循环右移一位,为下一次扫描准备 _rr(&display_codes[0]); _rr(&display_codes[1]); _rr(&display_codes[2]); _rr(&display_codes[3]); _rr(&display_codes[4]); _rr(&display_codes[5]); if(com_pulse == 8) { //扫描次数==8, 一个扫描周期结束 com_pulse = 0;//从0开始计数 } } //查得段位码, 原汇编中子程序名为 display_number void get_seg_codes() { unsigned char i, code, size; size = sizeof(count); for(i = 0; i < size; i++) { code = lcd_table[count[i]];//根据待显示的数值,查段码表,得到段位码, display_codes[i] = code; //存入段位码显示缓冲区 } } //十进制计数器,得到变化的样例数值 void get_display_number() { if(time_count == 255) { //255个timebase 计数,不到0.5秒 time_count = 0; count[5]++;//十进制计数,由个位数加起 if(count[5] == 10) { //个位满十，向十位进1 count[5] = 0; count[4]++;//进位 if(count[4] == 10) { //十位满十，向百位进1 count[4] = 0; count[3]++; if(count[3] == 10) { //百位满十，向千位进1 count[3] = 0; count[2]++; if(count[2] == 10) { //千位满十，向万位进1 count[2] = 0; count[1]++; if(count[1] == 10) { //万位满十，向十万位进1 count[1] = 0; count[0]++; } } } } } } } //主程序 void main() { init();//初始化 while(1) { //无穷循环 _clrwdt(); get_display_number();//做十进制计数 if(com_pulse == 0) //每个扫描周期开始前,先查得待显示数据的段位码 get_seg_codes();//查得段位码 if(display_flag) //若需要刷新显示 lcd_display(); //显示到LCD } }