Design of advertising lamp based on 51 single chip microcomputer

1. Experimental task
　　: Use the table method to make the 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 schematic 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 the 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 the MOVC function 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 flowchart

　　　　　　　　　　Figure 4.5.2
6. 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, 0x7f,
                            0xbf,0xdf,0xef,
                            0xf7, 0xfb,0xfd,0xfe,
                            0x7f,0xbf,0xdf,0xef,
                            0xf7,0xfb,0xfd,0xfe,
                            0x00,0xff,0x00,0xff,
                            0x01};
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;
          }
    }
}