;lcd routines cblock 0x2A lcd_shadow,lcd_tmp,lcda,lcd_char endc #define lcd_port PORTB #define lcd_enable lcd_shadow,0 #define lcd_rs lcd_shadow,1 #define lcd_rw lcd_shadow,2 ;------------------------------ lcd_uport macro MOV W, lcd_shadow MOV lcd_port, W endm ;------------------------------ ;strobe lcd enable lcd_strobe: MOV W, #20 CALL delay SETB lcd_enable lcd_uport MOV W, #20 CALL delay MOV W, lcd_port AND W, #$F0 MOV lcd_tmp, W CLRB lcd_enable lcd_uport MOV W, <>lcd_tmp RET ;------------------------------ lcd_send_nibble: MOV lcd_tmp, W MOV W, #$0F AND lcd_tmp, W AND lcd_shadow, W MOV W, <>lcd_tmp OR lcd_shadow, W lcd_uport JMP lcd_strobe ;------------------------------ lcd_read_byte: MOV W, #$F0 ;*** WARNING: TRIS expanded in two instructions. Check if previous instruction is a skip instruction. ; tris lcd_port SETB lcd_rw lcd_uport CALL lcd_strobe MOV lcda, W SWAP lcda CALL lcd_strobe OR lcda, W MOV W, #0 ;*** WARNING: TRIS expanded in two instructions. Check if previous instruction is a skip instruction. ; tris lcd_port CLRB lcd_rw MOV W, lcda RET ;------------------------------ #define sv_addr bit_tmp,0 lcd_putc: SETB lcd_rs lcd_send_byte: MOV lcd_char, W CLRB sv_addr SNB lcd_rs SETB sv_addr CLRB lcd_rs sb0 CALL lcd_read_byte ;wait until not lcd busy AND W, #%10000000 SB Z JMP sb0 CLRB lcd_rw CLRB lcd_rs SNB sv_addr SETB lcd_rs MOV W, <>lcd_char CALL lcd_send_nibble MOV W, lcd_char JMP lcd_send_nibble ;------------------------------ lcd_init: MOV W, #0 ;*** WARNING: TRIS expanded in two instructions. Check if previous instruction is a skip instruction. ; tris lcd_port CLR lcd_shadow lcd_uport MOV W, #50 CALL delay_ms MOV W, #3 MOV lcda, W CLRB lcd_rs lcdi0 MOV W, #3 CALL lcd_send_nibble MOV W, #15 CALL delay_ms DECSZ lcda JMP lcdi0 MOV W, #2 CALL lcd_send_nibble MOV W, #%00101000 ;function set CALL lcd_send_byte ;4 bit,1/6 duty,5x8 MOV W, #%00001000 ;display off,cursor off, blink off CALL lcd_send_byte MOV W, #%00000001 ;clear screen cursor home CALL lcd_send_byte MOV W, #%00000110 ;Increment cursor, don't shift screen CALL lcd_send_byte MOV W, #%00001111 ;display on,cursor on, blink on CALL lcd_send_byte RET ;------------------------------ ;lcd_gotoxy ; input W = YYXXXXXX ; 76543210 ; ; Y address ; --- ------- ; 00 0 ; 01 0x40 ; 10 20 ; 11 0x40+20 xy_loc macro x, y MOV W, #(y < ;< 6) | (x & B'00111111') CALL lcd_gotoxy endm lcd_gotoxy: MOV lcd_tmp, W AND W, #%00111111 SNB lcd_tmp.6 ;*** WARNING: ADDLW was expanded in three instructions! Check if previous instruction is a skip instruction. ; addlw 0x40 MOV Hack, W MOV W, #$40 ADD W, Hack SNB lcd_tmp.7 ;*** WARNING: ADDLW was expanded in three instructions! Check if previous instruction is a skip instruction. ; addlw .20 MOV Hack, W MOV W, #20 ADD W, Hack OR W, #%10000000 CLRB lcd_rs JMP lcd_send_byte ;------------------------------ lcd_cursor_off: CLRB lcd_rs MOV W, #%00001100 ;display on,cursor off, blink off JMP lcd_send_byte ;------------------------------ lcd_cursor_on: CLRB lcd_rs MOV W, #%00001111 ;display on,cursor on, blink on JMP lcd_send_byte
file: /Techref/SCENIX/lib/io/dev/lcd/4bitlcd_sx.htm, 3KB, , updated: 2000/6/29 14:46, local time: 2024/11/8 17:11,
3.94.202.151:LOG IN ©2024 PLEASE DON'T RIP! THIS SITE CLOSES OCT 28, 2024 SO LONG AND THANKS FOR ALL THE FISH!
|
©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://www.sxlist.com/TECHREF/SCENIX/lib/io/dev/lcd/4bitlcd_sx.htm"> SCENIX lib io dev lcd 4bitlcd_sx</A> |
Did you find what you needed? |
Welcome to sxlist.com!sales, advertizing, & kind contributors just like you! Please don't rip/copy (here's why Copies of the site on CD are available at minimal cost. |
Welcome to www.sxlist.com! |
.