MAX7219測(cè)試程序
說明：MAX7219是美國(guó)MAXIM公司推出的三線串行8位LED顯示驅(qū)動(dòng)器,具有多種顯示（可控）方式。
;Program Test MAX7219
;This program is used to test whether MAX7219 is Ok and give a demo about ho
w to use it.
;Program Writed by Ouyijie, 1998.10
;Jialijie Computer Studio
PCL EQU 2 ;PCL = 2
DCOMMAND EQU 0x0d
DDATA EQU 0x0e
MCU_Reset
;I/O RB1 is Clock line
;I/O RB2 is LOAD line
;I/O RB3 is DATA line
;I/O RB4 is LED ,show state
movlw b''00000000'' ;set first I/O direction
tris 6
movlw b''00000000'' ;set first I/O state
movwf 0x06
Start
call MAX7219_Reset
comf 0x06,f
call Delay1s
goto Start
MAX7219_Reset ;reset MAX7219
;0x0d is display command
;0x0e is display data
movlw 0x0c
movwf DCOMMAND
movlw 0x00
movwf DDATA
call Write7219 ;write in 0c00H, shut down MAX7219.
call Delay1ms ;wait leaest 250us.
movlw 0x09
movwf DCOMMAND
movlw 0x3f
movwf DDATA
call Wr ite7219 ;write in 091fH, digits 0 to 5 are transcode.
call Delay1ms
movlw 0x0a
movwf DCOMMAND
movlw 0x0a
movwf DDATA
call Write7219 ;write in 0a0fH, set MAX7219 is the brightest state.
call Delay1ms
movlw 0x0b
movwf DCOMMAND
movlw 0x05
movwf DDATA
call Write7219 ;set SCAN LIMIT is digits 0 to 5.
call Delay1ms
;movlw 0x0f
;movwf DCOMMAND
;movlw 0x00
;movwf DDATA
;call Write7219 ;wirte in 0f00H, exit TEST, go into normal state.
;call Delay1ms
;Begin set Digit Datas
movlw 0x01
movwf DCOMMAND
movlw 0x00
movwf DDATA
call Write7219 ;bit0 is 0
call Delay1ms
movlw 0x02
movwf DCOMMAND
movlw 0x01
movwf DDATA
call Write7219 ;bit1 is 1
call Delay1ms
movlw 0x03
movwf DCOMMAND
movlw 0x02 ;bit2 is 2
movwf DDATA
call Write7219
call Delay1ms
movlw 0x04
movwf DCOMMAND
movlw 0x03 ;bit3 is 3
movwf DDATA
call Write7219
call Delay1ms
movlw 0x05
movwf DCOMMAND
movlw 0x04 ;bit4 is 4 |
66821730(技術(shù)支持)
