;-----------------------------------------------------
;清屏
clear_screen:
mov byte_display_page_memory, #0
lcall clear_line_screen
mov byte_display_page_memory, #2
lcall clear_line_screen
mov byte_display_page_memory, #4
lcall clear_line_screen
mov byte_display_page_memory, #6
; lcall clear_line_screen
; ret
clear_line_screen:
mov byte_display_row_memory, #0
mov r3, #08h
clear_line_screen_1:
mov dptr, #char_kong
lcall display_write_32_data
djnz r3, clear_line_screen_1
ret
;---------------------------------------------------
;全屏
fill_line_screen:
mov byte_display_row_memory, #0
mov r3, #08h
fill_line_screen_1:
mov dptr, #char_man
lcall display_write_32_data
djnz r3, fill_line_screen_1
ret
;-----------------------------------------------------
;连续输出16字节数据到LCD屏
display_write_16_data:
mov r5, #8
display_write_16_data_1:
lcall display_select_page
lcall display_select_row
clr a
movc a, @a+dptr
lcall display_write_data
inc dptr
djnz r5, display_write_16_data_1
inc byte_display_page_memory
clr c
mov a, byte_display_row_memory
subb a, #8
mov byte_display_row_memory, a
mov r5, #8
display_write_16_data_2:
lcall display_select_page
lcall display_select_row
clr a
movc a, @a+dptr
lcall display_write_data
inc dptr
djnz r5, display_write_16_data_2
dec byte_display_page_memory
ret
;---------------------------------------------------
;连续输出32字节数据到LCD屏
display_write_32_data:
mov r5, #16
display_write_32_data_1:
lcall display_select_page
lcall display_select_row
clr a
movc a, @a+dptr
lcall display_write_data
inc dptr
djnz r5, display_write_32_data_1
inc byte_display_page_memory
clr c
mov a, byte_display_row_memory
subb a, #16
mov byte_display_row_memory, a
mov r5, #16
display_write_32_data_2:
lcall display_select_page
lcall display_select_row
clr a
movc a, @a+dptr
lcall display_write_data
inc dptr
djnz r5, display_write_32_data_2
dec byte_display_page_memory
ret
;-----------------------------------------------------------
display_write_data: ;数据在A中
nop
;如果列的数目大于63，则应该显示到右半屏幕，否则应该显示在左半屏幕
;注意，此处显示手册上给出的说明不准确
jb byte_display_row_memory.6, display_write_data_left
setb pin_display_right_cs
sjmp display_write_data_leftright
display_write_data_left:
setb pin_display_left_cs
display_write_data_leftright:
clr pin_display_rw
setb pin_display_di
nop
setb pin_display_enable
mov p0, a
nop
clr pin_display_enable
nop
setb pin_display_rw
clr pin_display_right_cs
clr pin_display_left_cs
nop
inc byte_display_row_memory
; ljmp delay_100us
; lcall delay_100us
ret
;-----------------------------------------------------
display_on:
mov a, #3fh
sjmp display_write_instrument
display_off:
mov a, #3eh
sjmp display_write_instrument
;-------------------------
display_select_z: ;此处是修改DDR和屏幕的对应关系
mov a, #0c0h
sjmp display_write_instrument
;-------------------------
display_select_page:
display_select_x: ;此处是选择要写入的DDR的页码
mov a, byte_display_page_memory
orl a, #0f8h
clr acc.6
sjmp display_write_instrument
;-------------------------
display_select_row:
display_select_y:
mov a, byte_display_row_memory
orl a, #0c0h
clr acc.7
; sjmp display_write_instrument
; ret
;-------------------------
display_write_instrument: ;指令在A中
setb pin_display_right_cs
setb pin_display_left_cs
clr pin_display_rw
clr pin_display_di
nop
setb pin_display_enable
mov p0, a
nop
clr pin_display_enable
nop
setb pin_display_rw
clr pin_display_right_cs
clr pin_display_left_cs
; ljmp delay_100us
; lcall delay_100us
ret
display_write_16_data_a:
mov r5, #16
display_write_16_data_b:
lcall display_select_page
lcall display_select_row
clr a
movc a, @a+dptr
lcall display_write_data
inc dptr
djnz r5, display_write_16_data_b
inc byte_display_page_memory
clr c
mov a, byte_display_row_memory
subb a, #16
mov byte_display_row_memory, a
ret
;-----------------------------------------------------
说明一下：这个屏是分左右半屏的，型号好像是rt12864A，不带字库。你可以看瑞特公司的文档，有例程 |
