; ********************************************************************** ; * File Demo_PPI.asm board: GPC 323 with SXA51 * ; * GRIFO(R) via Dell'Artigiano 8/6 40016 S. Giorgio di Piano (BO) * ; * Tel. +39 051 892052 Fax. +39 051 893661 * ; * http://www.grifo.it http://www.grifo.com * ; * by Alessio Francesconi 07.09.04 * ; ********************************************************************** ; DEB 01's example program of section 1, driven from a GPC 323. ; This section is composed by 16 keys conncted to 16 LEDs: ; the pressure of one or more of these keys, sets the logic state 0 on ; the line and the relative LED is lit by hardware. ; This program has to comunicate with PC and to shifts the lighting ; of one LED in one direction only, on both the ports, with a buzzer sound ; emission at the course end. ; In this case the jumper J10 must be in 2-3 position, to connect the buzzer ; to section 1; the buzzer sounds through a square wave generation on the ; port 1.7 line, that drives also the last LED. ; For cursor movement and positioning, are used some command sequences ; with ADDS Viewpoint standard (see GET51 manual). ; The connection is realized through one 20 pins flat cable that interface ; CN7 connector of GPC 323 and CN15 connector of DEB 01. ; ; ; ; Addresses of on board peripherals ; PDA EQU 0FFFCH ;82c55's data register of port A PDC EQU 0FFFEH ;82c55's data register of port C CNT EQU 0FFFFH ;82c55's control and command register ; ; Initialization of constant data ; INIT EQU 82H ;mode 0;port A and C in output,port B in input TXCHAR EQU 0DH ;variable with the value for the transmission PORTA EQU 08H ;internal memory address with portA value PORTC EQU 09H ;internal memory address with portC value DELAY EQU 11H ;variable used in delay subroutine ; ; Start of main program ; ORG 2050H ;beginning of executable part program MAIN: MOV SP,#2FH ;initialize the first free location pointer of the stack MOV DPTR,#CNT ;initialization of PPI 82c55 as indicated in INIT MOV A,#INIT MOVX @DPTR,A ;write to 82C55's control register control word CLR RS0 ;select the registers bank 0 (00H-07H) CLR RS1 ACALL SERIAL MOV DPTR,#HEADING ;print to monitor the "HEADING" string ACALL STRING ; CYCLE_LED: MOV PORTA,#0FEH ;light the first LED of port 0 MOV PORTC,#0FFH ;keep turned off the LEDs of port1 MOV R0,#08 ;execute eight cycles to shift port 0 CYCLE_A: MOV R2,#256 ACALL DELAY100 ;25 msec delay ACALL OUTPORTAC ;visualize the PORTA and PORTC contents MOV A,PORTA ;on DEB01's LEDs RL A ;shift the light LED left MOV PORTA,A DJNZ R0,CYCLE_A ;reached last LED of Port 0 MOV PORTA,#0FFH ;turn off the LEDs of Port 0 MOV PORTC,#0FEH ;light the first LED of port1 MOV R0,#08 ;execute other eight cycles to shift port 1 CYCLE_C: MOV R2,#256 ACALL DELAY100 ACALL OUTPORTAC ;visualize the PORTA and PORTC contents MOV A,PORTC RL A MOV PORTC,A CJNE R0,#01,BUZZER ACALL SOUND ;generate beep BUZZER: DJNZ R0,CYCLE_C ;reached last LED of Port 1 MOV PORTC,#0FFH ;turn off Port 1 AJMP CYCLE_LED ; ; Subroutine to show the acquire data on Port A ; OUTPORTAC: PUSH PSW ;save registers used by subroutine PUSH DPL PUSH DPH PUSH ACC MOV A,PORTA ;save the PORTA variable data on A MOV DPTR,#PDA ;load the Port A address MOVX @DPTR,A ;write data on port A MOV A,PORTC ;save the PORTC variable data on A MOV DPTR,#PDC ;load the Port C address MOVX @DPTR,A ;write data on Port C POP ACC ;restore registers used by subroutine POP DPH POP DPL POP PSW RET ; ; Serial initialization procedure ; SERIAL: PUSH PSW ;save PSW MOV SCON,#50H ;select mode 1, active reception MOV TH1,#253 ;initialize to 19200 baud ANL PCON,#7FH ;reset the bit 7 of PCON (SMOD) POP PSW ;restore PSW RET ; ; Subroutine for sound emission with buzzer of DEB 01 ; SOUND: MOV R5,#256 ;external counter for beep lenght CYCLEBUZ: MOV R4,#200 ;counter for low level of square wave MOV PORTC,#7FH ;set buzzer line = last LED low ACALL OUTPORTAC BUZ1: DJNZ R4,BUZ1 MOV R4,#150 ;counter for high level of square wave MOV PORTC,#0FFH ;set buzzer line = last LED high ACALL OUTPORTAC BUZ2: DJNZ R4,BUZ2 DJNZ R5,CYCLEBUZ ;repeat cycle for the beep lenght RET ; ; Serial transmission of a string contained in external data memory ; STRING: PUSH PSW ;save registers used by subroutine PUSH ACC PUSH TXCHAR STRINGLOOP: MOVX A,@DPTR ;load into A the memory contents pointed by DPTR JZ ENDSTRING ;if the last reading character is void (00H),jump to end MOV TXCHAR,A ;put the current character into the variable for the transmission ACALL TRASMSER ;transmit the character INC DPTR ;increase the pointer to be ready SJMP STRINGLOOP ;for the following character ENDSTRING: POP TXCHAR ;restore registers used by subroutine POP ACC POP PSW RET ; ; Serial transmission's procedure ; TRASMSER: PUSH PSW ;save PSW TRASM1: JBC TI,TRASM2 ;jump to TRASM2 if TI = 1 and reset TI SJMP TRASM1 ;jump to TRASM1 because TI = 0 ;and serial is still in transmission TRASM2: MOV SBUF,TXCHAR POP PSW ;restore PSW RET ; ; Subroutine for delay of 100 microseconds variable with R2 ; DELAY100: MOV DELAY,#100 ;100 cycles to obtain 100 usec delay DJNZ DELAY,$ ;defined by measure DJNZ R2,DELAY100 RET ; ; HEADING: DB 0CH,' Shifts the lighting of one LED in one direction only sounding the buzzer',1DH,' at the course end. ',00H END