linux下通过并行口控制1602LCM的代码

linux下并行口操作和字符型LCM显示控制

 

备注：源文件已上传到资源中心

 

注释慢慢补

代码：

 

#include
#include /* for libc5 */
#include /* for glibc */

// http://leadgenius.cublog.cn/

#define THEPORTS 0x3FF
#define DATAPORT 0x378
#define STATPORT 0x379
#define CTRLPORT 0x37A

#define DELAYTIME 1000

// 0xC0: to make the first bit 0, to STROBE of patport is SET, to gave E_1602 a 1, The default.
#define CTRLPORT_INIT 0xC0
#define CTRLPORT_ZRS 0x02
#define CTRLPORT_ZE 0x01

#define LCDCMD_CLEAN 0x01  // ctrl cmd #1
#define LCDCMD_CURSOR_RET 0x02  // ctrl cmd #2

#define LCDCMD_DISPMODE 0x04  // ctrl cmd #3
#define LCDCMD_DISPMODE_CURSOR_MVRIGHTAUTO 0x02
#define LCDCMD_DISPMODE_TEXT_MVABLE 0x01

#define LCDCMD_DISPSWITCH 0x08  // ctrl cmd #4
#define LCDCMD_DISPSWITCH_DISPON 0x04
#define LCDCMD_DISPSWITCH_CURSORON 0x02
#define LCDCMD_DISPSWITCH_CURSORTWINKLE 0x01

#define LCDCMD_CONTENTMV 0x10  // ctrl cmd #5
#define LCDCMD_CONTENTMV_TEXTMV 0x08
#define LCDCMD_CONTENTMV_CURSORMV 0x04

#define LCDCMD_FUNCSET 0x20  // ctrl cmd #6
#define LCDCMD_FUNCSET_8BITBUS 0x10
#define LCDCMD_FUNCSET_2LINES 0x08
#define LCDCMD_FUNCSET_5x10C 0x40

// ctrl cmd #7 is not USEd

#define LCDCMD_POSISET 0x80  // ctrl cmd #8
#define LCDCMD_POSISET_1LINE 0x00
#define LCDCMD_POSISET_2LINE 0x40

//typedef struct TEXTMAP {

//}Textmap;

//static Textmap text_map = {

// };

void Write_Command(unsigned char cmd)
{
 unsigned char ctrlbyte;

 outb(cmd, DATAPORT);

 // clr autofeed to RS_1602. clr XX to RW_1602. clr strobe to E_1602
 ctrlbyte = CTRLPORT_INIT | CTRLPORT_ZRS;
 outb(ctrlbyte, CTRLPORT);
 ctrlbyte = CTRLPORT_INIT | CTRLPORT_ZRS | CTRLPORT_ZE;
 outb(ctrlbyte, CTRLPORT);

 usleep(DELAYTIME);

 outb(CTRLPORT_INIT, CTRLPORT); // set strobe to E_1602 an AUTOFEED to RS_1602
}

void Write_Data(char data)
{
 unsigned char ctrlbyte;

 outb(data, DATAPORT);

 // set autofeed to RS_1602. clr XX to RW_1602. clr strobe to E_1602
 ctrlbyte = CTRLPORT_INIT | CTRLPORT_ZE;
 outb(ctrlbyte, CTRLPORT);

 usleep(DELAYTIME);

 outb(CTRLPORT_INIT, CTRLPORT); // set strobe to E_1602 an AUTOFEED to RS_1602
}

void Write_Text(char *t)
{
 while(*t != 0)
 {
  Write_Data(*t++);
 }
}

int main(int argc, char **argv)
{
 int ret;

 if(argc < 3)
 {
  fprintf(stderr, "Usage Format: %s \n", argv[0]);
  fprintf(stderr, "or\nUsage Format: %s 0 \n", argv[0]);
  fprintf(stderr, "\t must > 0, for 1602 should < 3\n");
  fprintf(stderr, "\t will be shown in the line.\n");
  fprintf(stderr, "\t:\n");
  fprintf(stderr, "\t\"init\" must be used before all LCD operations, do once enough\n");
  fprintf(stderr, "\t\"clean\" will clean the content the LCD shown\n");
  fprintf(stderr, "\nExample: %s 2 \"Hello World !\"\n", argv[0]);
  return 1;
 }

 ret = ioperm(0x00, THEPORTS, 1);
 if(-1 == ret)
 {
  printf("\r\n ioperm return -1");
  return 1;
 }

 // init CTRLPORT
 outb(CTRLPORT_INIT, CTRLPORT);

 if(argv[1][0] == '1')
 {
  Write_Command(LCDCMD_POSISET);
  Write_Text(argv[2]);
 }
 else if(argv[1][0] == '2')
 {
  Write_Command(LCDCMD_POSISET | LCDCMD_POSISET_2LINE);
  Write_Text(argv[2]);
 }
 else if(argv[1][0] == '0')
 {
  if(!strcmp(argv[2], "init"))
  {
   Write_Command(LCDCMD_CLEAN);
   Write_Command(LCDCMD_FUNCSET | LCDCMD_FUNCSET_8BITBUS | LCDCMD_FUNCSET_2LINES);
   Write_Command(LCDCMD_DISPSWITCH | LCDCMD_DISPSWITCH_DISPON);
   Write_Command(LCDCMD_DISPMODE | LCDCMD_DISPMODE_CURSOR_MVRIGHTAUTO);
  }
  else if(!strcmp(argv[2], "clean"))
  {
   Write_Command(LCDCMD_CLEAN);
  }
  else
   fprintf(stderr, "Unknown preCMD type found!\n");
 }
 else
 {
  fprintf(stderr, "Unknown preCMD type found!\n");
 }
}

 

 

附图