Design of advertising lamp based on single chip microcomputer

1. Experimental task
Use the table method to make port P1 change a single light: move left 2 times, move right 2 times, and flash 2 times (delay time 0.2 seconds).
2. Circuit diagram

Figure 4.5.1
3. Hardware connection on the system board
Connect P1.0-P1.7 in the "MCU system" area to the L1-L8 ports in the "Eight-way LED indicator module" area with an 8-core cable. The requirements are: P1.0 corresponds to L1, P1.1 corresponds to L2, ..., P1.7 corresponds to L8.
4. Program design content
When using a table for programming, the following instructions must be used to complete
(1). Use the MOV DPTR, #DATA16 instruction to make the data pointer register point to the beginning of the table.
(2). Use the MOVC A, @A + DPTR instruction to add the value of the accumulator to the value of the DPTR, so that the program counter PC can point to the data to be retrieved from the table.
Therefore, as long as the control code is built into a table and MOVC A, @A + DPTR is used to perform the code retrieval operation, some complex control actions can be easily processed. The table retrieval process is shown in the figure below:
5. Program flow chart

Figure 4.5.2
6. Assembly source program
ORG 0
START: MOV DPTR,#TABLE
LOOP: CLR A
MOVC A,@A+DPTR
CJNE A,#01H,LOOP1
JMP START
LOOP1: MOV P1,A
MOV R3,#20
LCALL DELAY
INC DPTR
JMP LOOP
DELAY : MOV R4,#20
D1: MOV R5,#248
DJNZ R5,$
DJNZ R4,D1
DJNZ R3,DELAY
RET
TABLE: DB 0FEH,0FDH,0FBH,0F7H
DB 0EFH,0DFH,0BFH,07FH
DB 0FEH,0FDH,0FBH ,0F7H
DB 0EFH,0DFH,0BFH,07FH
DB 07FH,0BFH,0DFH,0EFH
DB 0F7H,0FBH,0FDH,0FEH
DB 07FH,0BFH,0DFH,0EFH
DB 0F7H,0FBH,0FDH,0FEH
DB 00H, 0FFH,00H, 0FFH
DB 01H
END
7. C language source program
#include
unsigned char code table[]={0xfe,0xfd,0xfb,0xf7,
0xef,0xdf,0xbf,0x7f,
0xfe,0xfd,0xfb,0xf7,
0xef,0xdf,0xbf,0x7f
unsigned char i ;
void delay ​ ​ ​(void) { unsigned char m,n,s; for(m=20;m>0;m--) for(n=20;n>0;n--) for(s=248;s>0;s--); } void main(void) { while(1) { if(table[i]!=0x01) { P1=table[i]; i++; delay(); } else { i=0; } } }