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  1. /*
  2. 	运行：sudo ./12864 [字符]
  3. 	编译：gcc 12864.c -o 12864 -L lib -l wiringPi (需已安装wiringPi)
  4. 	by：WuSiYu
  5. */
  6. #include <stdio.h>
  7. #include <stdlib.h>
  8. #include <stdint.h>
  9. #include <wiringPi.h>
  10. #include <iconv.h> 
  11.  
  12. #define LCD_RS 4 //显示屏控制线
  13. #define LCD_RW 5
  14. #define LCD_EN 1
  15.  
  16. #define D1 30 //显示屏数据线
  17. #define D2 21
  18. #define D3 22
  19. #define D4 23
  20. #define D5 24
  21. #define D6 25
  22. #define D7 26
  23. #define D8 27
  24.  
  25. char u2g_out[255]; 
  26.  
  27. /*===================================================================
  28. 功能：编码转换
  29. 输入：UTF8
  30. 输出：GB2312
  31. ====================================================================*/
  32. int code_convert(char *from_charset,char *to_charset,char *inbuf,int inlen,char *outbuf,int outlen){
  33. 	iconv_t cd;
  34. 	int rc;
  35. 	char **pin = &inbuf;
  36. 	char **pout = &outbuf;
  37.  
  38. 	cd = iconv_open(to_charset,from_charset);
  39. 	if (cd==0) return -1;
  40. 	memset(outbuf,0,outlen);
  41. 	if (iconv(cd,pin,&inlen,pout,&outlen)==-1) return -1;
  42. 	iconv_close(cd);
  43. 	return 0;
  44. }
  45.  
  46. int u2g(char *inbuf,int inlen,char *outbuf,int outlen){ 
  47. 	return code_convert("utf-8","gb2312",inbuf,inlen,outbuf,outlen); 
  48. } 
  49.  
  50. /*===================================================================
  51. 功能：总线写入
  52. 输入：十六进制数据
  53. 输出：无
  54. ====================================================================*/
  55. void bus_write(unsigned char data){
  56. 	int t[10];
  57. 	int f=0,i=0,d=data;
  58.  
  59. 	//进制转换
  60. 	for(i=0;i<8;i++){
  61. 		t[i]=data%2;
  62. 		data=data/2;
  63. 	}
  64.  
  65. 	//输出
  66. 	digitalWrite(D1,t[0]);
  67. 	digitalWrite(D2,t[1]);
  68. 	digitalWrite(D3,t[2]);
  69. 	digitalWrite(D4,t[3]);
  70. 	digitalWrite(D5,t[4]);
  71. 	digitalWrite(D6,t[5]);
  72. 	digitalWrite(D7,t[6]);
  73. 	digitalWrite(D8,t[7]);
  74. }
  75. /*===================================================================
  76. 功能：检查LCD忙状态                                                    
  77. 输入：无
  78. 输出：lcd_busy为1时，忙，等待。lcd-busy为0时,闲，可写指令与数据。      
  79. ====================================================================*/
  80. void chk_busy(){//检查忙位
  81. 	digitalWrite(LCD_RS,0);
  82. 	digitalWrite(LCD_RW,1);
  83. 	digitalWrite(LCD_EN,1);
  84. 	bus_write(0xff);
  85. 	pinMode(D8, INPUT);
  86. 	while(digitalRead(D8));
  87. 	pinMode(D8, OUTPUT);
  88. 	digitalWrite(LCD_EN,0);
  89. }
  90. /*====================================================================
  91. 功能：写命令
  92. 输入：8位数据
  93. 输出：无
  94. =====================================================================*/
  95. void WriteCmd_LCD12864(unsigned char cmdcode){
  96. 	chk_busy();
  97. 	digitalWrite(LCD_RS,0);
  98. 	digitalWrite(LCD_RW,0);
  99. 	digitalWrite(LCD_EN,1);
  100. 	delay(5);
  101. 	bus_write(cmdcode);
  102. 	digitalWrite(LCD_EN,0);
  103. 	delay(5);
  104. }
  105. /*====================================================================
  106. 功能：写数据
  107. 输入：8位数据
  108. 输出：无
  109. =====================================================================*/
  110. void WriteData_LCD12864(unsigned char Dispdata){
  111. 	chk_busy();
  112. 	digitalWrite(LCD_RS,1);
  113. 	digitalWrite(LCD_RW,0);
  114. 	digitalWrite(LCD_EN,1);
  115. 	delay(5);
  116. 	bus_write(Dispdata);
  117. 	digitalWrite(LCD_EN,0);
  118. 	delay(5);
  119. }
  120. /*==========================================================================
  121. 功能：发送字符串
  122. 输入：地址，字符串
  123. 输出：无
  124. ===========================================================================*/
  125. void WriteWord_LCD12864(unsigned char a,unsigned char *d){//向LCD指定位置发送一个字符串,长度64字符之内。
  126. 	unsigned char *s;
  127. 	u2g(d,strlen(d),u2g_out,255);
  128. 	s=u2g_out;
  129. 	WriteCmd_LCD12864(a);
  130. 	while(*s>0){
  131. 		WriteData_LCD12864(*s); 
  132. 		s++;
  133. 	}
  134. }
  135. /*==========================================================================
  136. 功能：发送字符串2
  137. 输入：字符串
  138. 输出：无
  139. ===========================================================================*/
  140. void WriteWord_LCD12864_2(unsigned char *d){//向LCD发送一屏字符串,长度64字符之内。
  141. 	int i=0;
  142. 	unsigned char *s;
  143. 	u2g(d,strlen(d),u2g_out,255);
  144. 	s=u2g_out;
  145. 	WriteCmd_LCD12864(0x80);
  146. 	while(*s>0){
  147. 		WriteData_LCD12864(*s); 
  148. 		s++;
  149. 		i++;
  150. 		if(i==16){
  151. 			WriteCmd_LCD12864(0x90);
  152. 		}
  153. 		if(i==32){
  154. 			WriteCmd_LCD12864(0x88);
  155. 		}
  156. 		if(i==48){
  157. 			WriteCmd_LCD12864(0x98);
  158. 		}
  159. 	}
  160. }
  161. /*==========================================================================
  162. 功能：初始化LCD
  163. 输入：无
  164. 输出：无
  165. ===========================================================================*/
  166. void Init_LCD12864(void){			//初始化LCD屏
  167. 	pinMode(D1, OUTPUT);	//设置GPIO
  168. 	pinMode(D2, OUTPUT);
  169. 	pinMode(D3, OUTPUT);
  170. 	pinMode(D4, OUTPUT);
  171. 	pinMode(D5, OUTPUT);
  172. 	pinMode(D6, OUTPUT);
  173. 	pinMode(D7, OUTPUT);
  174. 	pinMode(D8, OUTPUT);
  175.  
  176. 	pinMode(LCD_RS, OUTPUT);
  177. 	pinMode(LCD_RW, OUTPUT);
  178. 	pinMode(LCD_EN, OUTPUT);
  179.  
  180. 	WriteCmd_LCD12864(0x38);       //选择8bit数据流
  181. 	delay(20);
  182. 	WriteCmd_LCD12864(0x01);       //清除显示，并且设定地址指针为00H
  183. 	delay(20);
  184. 	WriteCmd_LCD12864(0x0c);       //开显示(无游标、不反白)
  185. 	delay(20);
  186. }
  187.  
  188. int main (int args, char *argv[]){
  189. 	wiringPiSetup();
  190. 	Init_LCD12864();
  191.  
  192. 	WriteCmd_LCD12864(0x01);
  193. 	WriteWord_LCD12864(0x80,"Hello LCD12864");
  194. 	if(argv[1]){
  195. 		WriteCmd_LCD12864(0x01);
  196. 		WriteCmd_LCD12864(0x80);
  197. 		WriteWord_LCD12864_2(argv[1]);
  198. 	}
  199. }
  200.  
  201.  
  202.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.c:9:22: fatal error: wiringPi.h: No such file or directory
 #include <wiringPi.h>
                      ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/IHrLSu
树莓派LCD12864显示屏驱动程序(st7920)
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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