PowerPoint 프레젠테이션

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1 Text-LCD Device Control - Device driver Jo, Heeseung

2 M3 모듈에장착되어있는 Tedxt LCD 장치를제어하는 App 을개발 TextLCD 는영문자와숫자일본어, 특수문자를표현하는데사용되는디바이스 HBE-SM5-S4210 의 TextLCD 는 16 문자 *2 라인을 Display 할수있으며, 이 TextLCD 를제어하기위하여 FPGA 내부에 Controller 가설계되어있음 Text LCD 2

3 TextLCD Controller 는 LCD_Ctrl_Reg(Character LCD Control Register) 레지스터에의해제어 TextLCD Control Register 의데이터비트구조를나타낸표 Physical Address 0x0500_0010 CLCD_Ctrl_Reg BIT Reserved CLCD_R S CLCD_R W CLCD_E Reset X X X X X Bits Name Description 0 CLCD_D0 CLCD Data Bit 0 1 CLCD_D1 CLCD Data Bit 1 2 CLCD_D2 CLCD Data Bit 2 3 CLCD_D3 CLCD Data Bit 3 4 CLCD_D4 CLCD Data Bit 4 5 CLCD_D5 CLCD Data Bit 5 6 CLCD_D6 CLCD Data Bit 6 7 CLCD_D7 CLCD Data Bit 7 8 CLCD_E CLCD Enable Bit (Active High) 9 CLCD_RW CLCD Read/Write Control Bit ( 1 read, 0 Write) 10 CLCD_RS CLCD Data Instruction Register Set CLCD_D7 CLCD_D6 CLCD_D5 CLCD_D4 CLCD_D3 CLCD_D2 CLCD_D1 CLCD_D0 3

4 기능 제어제어명령 (D0 ~ D7) 신호실행시간 RS R/W Clear Display ms Return Home us Entry Mode Set I/D S 40us Display on/off control D C S 40us Cursor or Display Shift S/C R/L us Function Set D/L N F us Set CG RAM Address CG RAM Address 40us Set DD RAM Address DD RAM Address 40us Read Busy Flag and Address Data Write to CG RAM or DD RAM Data Read to CG RAM or DD RAM 0 1 BF Address Counter 40us 1 0 Write Address 40us 1 1 Read Address 40us 4

5 각기능들의동작 Clear Display - 모든디스플레이상태를소거하고커서를 Home 위치로돌려놓음 Return Home - DD RAM 의내용은변경하지않고커서만을 Home 으로위치 Entry Mode SET - 데이터를 Read 하거나 Write 할경우에커서의위치를증가시킬것인가 (I/D=1) 감소시킬것인가 (I/D=0) 를결정 - 이때화면을이동할것인지 (S=1) 아닌지 (S=0) 를결정 Display On/Off Control - 화면표시를 On/Off 하거나 (D) - 커서를 On/Off 하거나커서를깜박이게할것인지 (B) 의여부를결정 Cursor or Display Shift - 화면 (S/C=1) 또는커서 (S/C=0) 이동 - 오른쪽 (R/L=1) 또는왼쪽 (R/L=0) 5

6 각기능들의동작 Function SET - 인터페이스에서데이터의길이를 8 비트 (DL=1) 또는 4 비트 (DL=0) 로지정 - 화면표시행수를 2 행 (N=1) 또는 1 행 (N=0) 으로지정 - 문자의폰트를 5 x 10 도트 (F=1) 또는 5 x 7 도트 (F=0) 로지정 - 전원인가후최초에는주로이명령을보내게되는데, LCD 모듈이리셋되려면약 50ms 가소요되므로충분히기다린후에이코드를전송 - 또한, 4 비트로인터페이스할경우에는 DB4~DB7 을사용하며, 상위 4 비트를먼저전송하고다음에하위 4 비트를전송 Set CG RAM Address - Character Generator RAM 의어드레스를지정 - 이후에송수신하는데이터는 CG RAM 의데이터 Set DD RAM Address - Display Data RAM 의어드레스를지정 - 이후에송수신하는데이터는 DD RAM 의데이터 6

7 각기능들의동작 Read Busy Flag & Address - LCD 모듈이내부동작중임을나타내는 Busy Flag(BF) 및어드레스카운터의내용을 read - LCD 모듈이각제어코드를실행하는데는일정한시간이필요 - FPGA 가 BF 를읽어 1 일경우에는기다리고, - 0 일경우다음제어코드를보내는방법을사용 7

8 DD RAM 표시될각문자의 ASCII 코드데이터가저장되어있는메모리 모두 80 개의번지가있는데, 화면의각행과열의위치에는고유한어드레스값이부여 행과행사이의어드레스가연속하여있지않으므로주의 아래표는표시문자의위치에대한 DD RAM 의어드레스 구분 Line D 0E 0F 10 Line D 4E 4F 50 8

9 TextLCD 모듈에서화면에표시할수있는문자중 ASCII 도형문자의종류와코드값 구분 00H 10H 20H 30H 40H 50H 60H 70H 80H 90H 0 P p 1! 1 A Q a q 2 2 B R b r 3 # 3 C S c s 4 $ 4 D T d t 5 % 5 E U e u 6 & 6 F V f v 7 사용자미사용 7 G W g w 8 정의영역 ( 8 H X h x 9 영역 ) 9 I Y I y A * : J Z j z B + ; K [ k { C, < L l D - = M } m ] E. > N ^ n F /? O _ o 미사용영역 9

10 Device driver 소스파일 TextLcd 리눅스디바이스드라이버는커널에포함 menuconfig 실행 - Device Drivers -> [*] Misc devices -> [*] Hanback Electronics M3(FPGA) Device Support -> <*>TEXT LCD linux s4210/drivers/misc/hanback/textlcd.h 참조 linux s4210/drivers/misc/hanback/textlcd.c 참조 10

11 textlcd_test.c 프로그램 vi textlcd_test.c 001: #include <stdio.h> 002: #include <stdlib.h> 003: #include <string.h> 004: #include <unistd.h> 005: #include <sys/types.h> 006: #include <sys/stat.h> 007: #include <fcntl.h> 008: #include <sys/ioctl.h> 009: 010: #define TEXTLCD_BASE 0xbc 011: #define TEXTLCD_COMMAND_SET _IOW(TEXTLCD_BASE,0,int) 012: #define TEXTLCD_FUNCTION_SET _IOW(TEXTLCD_BASE,1,int) 11

12 013: #define TEXTLCD_DISPLAY_CONTROL _IOW(TEXTLCD_BASE,2,int) 014: #define TEXTLCD_CURSOR_SHIFT _IOW(TEXTLCD_BASE,3,int) 015: #define TEXTLCD_ENTRY_MODE_SET _IOW(TEXTLCD_BASE,4,int) 016: #define TEXTLCD_RETURN_HOME _IOW(TEXTLCD_BASE,5,int) 017: #define TEXTLCD_CLEAR _IOW(TEXTLCD_BASE,6,int) 018: #define TEXTLCD_DD_ADDRESS _IOW(TEXTLCD_BASE,7,int) 019: #define TEXTLCD_WRITE_BYTE _IOW(TEXTLCD_BASE,8,int) 020: 021: struct strcommand_varible { 022: char rows; 023: char nfonts; 024: char display_enable; 025: char cursor_enable; 026: char nblink; 027: char set_screen; 028: char set_rightshit; 029: char increase; 030: char nshift; 031: char pos; 032: char command; 033: char strlength; 034: char buf[16]; 035: }; 12

13 037: int main(int argc, char **argv) 038: { 039: int i,dev; 040: char buf0[16] = "Welcome to the "; 041: char buf1[16] = "Embedded World!!"; 042: char buf2[16] = " HANBACK "; 043: char buf3[16] = " Electronics "; 044: 045: struct strcommand_varible strcommand; 046: strcommand.rows = 0; 047: strcommand.nfonts = 0; 048: strcommand.display_enable = 1; 049: strcommand.cursor_enable = 0; 050: strcommand.nblink = 0; 051: strcommand.set_screen = 0; 052: strcommand.set_rightshit = 1; 053: strcommand.increase = 1; 054: strcommand.nshift = 0; 055: strcommand.pos = 10; 056: strcommand.command = 1; 057: strcommand.strlength = 16; 13

14 059: dev = open("/dev/textlcd", O_WRONLY O_NDELAY ); 060: 061: if (dev!= -1) { 062: write(dev,buf0,16); 063: strcommand.pos = 40; 064: ioctl(dev,textlcd_dd_address,&strcommand,32); 065: write(dev,buf1,16); 066: sleep(1); 067: 068: ioctl(dev,textlcd_clear,&strcommand,32); 069: 070: strcommand.pos = 0; 071: ioctl(dev,textlcd_dd_address,&strcommand,32); 072: for(i=0;i<16;i++) { 073: strcommand.buf[0]=buf2[i]; 074: ioctl(dev,textlcd_write_byte,&strcommand,32); 075: } 14

15 076: 077: strcommand.pos = 40; 078: ioctl(dev,textlcd_dd_address,&strcommand,32); 079: for(i=0;i<16;i++) { 080: strcommand.buf[0]=buf3[i]; 081: ioctl(dev,textlcd_write_byte,&strcommand,32); 082: } 083: 084: if(argc>=2) { 085: sleep(1); 086: ioctl(dev,textlcd_clear,&strcommand,32); 087: write(dev,argv[1],strlen(argv[1])); 088: if(argc==3) { 089: strcommand.pos = 40; 090: ioctl(dev,textlcd_dd_address,&strcommand,32); 091: write(dev,argv[2],strlen(argv[2])); 092: } 093: } 094: 095: close(dev); 15

16 096: } else { 097: printf( "application : Device Open ERROR!\n"); 098: exit(1); 099: } 100: return 0; 101: } 16

17 Makefile 작성 CC = arm-linux-gcc CFLAGS = -DNO_DEBUG EXEC = textlcd_test OBJS = $(EXEC).o all: $(EXEC) $(EXEC): $(OBJS) $(CC) -o $@ $^ clean: rm -f $(OBJS) $(EXEC) 17

18 컴파일 make clean 하면먼저컴파일된실행예제파일삭제 make 명령어로컴파일실행 ls Makefile textlcd_test.c make clean;make 다음과같은메시지가출력된다 rm f textlcd_test.o textlcd_test arm-linux-gcc c DNO_DEBUG o textlcd_test.o textlcd_test.c arm-linux-gcc o textlcd_test textlcd_test.o root@ubuntu:/working/device_driver/textlcd_driver# ls Makefile textlcd_test textlcd_test.c textlcd_test.o 테스트 nfs/tftpboot/modem 으로 board 에전송후 board 에서실행 18

PowerPoint 프레젠테이션

PowerPoint 프레젠테이션 KeyPad Device Control - Device driver Jo, Heeseung HBE-SM5-S4210 에는 16 개의 Tack Switch 를사용하여 4 행 4 열의 Keypad 가장착 4x4 Keypad 2 KeyPad 를제어하기위하여 FPGA 내부에 KeyPad controller 가구현 KeyPad controller 16bit 로구성된