PIC 16f877a i eeprom 24c..

[nenoo]

Zanima me dali je neko imao priliku programirati neki eeprom preko navedenog mikrokontrolera , ukoliko jeste molio bi da mi se javi ili posalje kod i semu povezivanja na n3no_s@hotmail.com !

Hvala !

[buco-1]

Zanima me dali je neko imao priliku programirati neki eeprom preko navedenog mikrokontrolera

Koje veličine?
Driver nije potpuno isti za npr. 24c512 ili 24c16. Inače imaš drivere za njih napisane za emulatore pay-tv kartica (one strarije pogotovu; kao silvercard), za pic 16f877 ali i 16f84, nema neke razlike jer im je jezgra ista pa možeš iskoristiti bilo koji.
Posjeduju i rutine (emulatori) s makronaredbama za čitanje i upis u te memorije iz vanjskog uređaja ili PC-a. Izradom skripte možeš direktno manipulirati podacima u toj memoriji pomoću svog MCU-a.

[buco-1]

Evo primjer jednog drivera za I2C memorije u assembleru za PIC MCU :

Code: Select all

;---------------------EXT EEPROM RUTINA -------------
I2CP1       BSF  STATUS,RP0 
            BCF  TRISA,0h                ; SDL // PORTA,1== SCL
            BCF STATUS,RP0
            RETURN
            ;
I2CP2       BSF  STATUS,RP0 
            BSF  TRISA,0h                ; ULAZNI  FD SDA
            BCF STATUS,RP0
            RETURN
            ;
I2C13      CLRW                ; THIS ROUTINE SHUD BE USED TO READ AND WRITE I2C MEM
            BTFSC STATUS,C     ; WHERE NEED TO BE DATA BASE FOR SUPORTED DEVICES
I2C15      IORLW 0x01          ; WHOLE ANSWERS TO PC PROM PROGRAMMER
            IORLW 0xA0         ; AND OF COURSE BOOTLOADER FILES FOR 128 AND 163 MEGA CARDS/MCUs
I2C17      MOVWF 0x20
           CALL  I2CP1         ; I STOP HERE COSE PRIMARY INTENTION WAS TO MAKE FOR
            MOVLW 0xF8         ; MYSELF SIMPLE PROGRAMMER FOR PROGRAMMING ATMEGA128
I2C1B      RLF 0x20,F          ; FOR MY MAIN PROJECT PROGRAMMER..........
            CALL I2C2C
I2C1D      ADDLW 0x01
            BTFSS STATUS,Z
            GOTO I2C1B
            GOTO I2C31
I2C21      CALL  I2CP2        ; PORTA 0== ULAZNI(SDL) PORTA1==IZLAZNI(SCL)
I2C23      MOVLW 0xF8
I2C24      CALL I2C33
I2C25      RLF 0x20,F
            ADDLW 0x01
            BTFSS STATUS,Z
            GOTO I2C24
I2C29      RETURN
            ;
I2C2A      CALL  I2CP1
I2C2C      BSF PORTA,0h
            BTFSS STATUS,C
I2C2E      BCF PORTA,0h
            BSF PORTA,1h
            GOTO I2C48
I2C31      CALL  I2CP2
I2C33      BSF PORTA,1h
            NOP
            BSF STATUS,C
            BTFSS PORTA,0h
            BCF STATUS,C
            GOTO I2C48
I2C39      BSF PORTA,0h
           CALL  I2CP1
I2C3C      NOP
            BSF PORTA,1h
            NOP
            BCF PORTA,0h
            GOTO I2C48
I2C41      BCF PORTA,0h
           CALL  I2CP1
            NOP
            BSF PORTA,1h
            NOP
            BSF PORTA,0h
I2C48      NOP
            BCF PORTA,1h       ; SCL
            RETURN
            ;
I2C4B     ; MOVWF 0x21         ; LOADR
I2C4C      CALL I2C39
            BCF STATUS,C
            CALL I2C13
            BTFSC STATUS,C
            GOTO I2C4C
            MOVF HIADR,W       ; HIADR
            ;ANDLW 0x7F         ;; LIMIT ZA 8K HI ADR
            CALL I2C17
            MOVF LOWADR,W        ;; LOW ADR I2C EEP
            GOTO I2C17
I2CRD      CALL I2C4C          ; 56//CITANJE  EXT EEPROMA BIO 4B
I2C57      CALL I2C39       
            BSF STATUS,C
            CALL I2C13
I2C5A      CALL I2C21
            BSF STATUS,C
I2C5C      CALL I2C2A
            CALL I2C41
            MOVF 0x20,W       ;; DATA REG
            RETURN
            ;
I2CWR      CALL I2C4C           
I2C7B      CALL I2C57           
           ; XORWF INDF,W
           ; BTFSC STATUS,Z
            ;GOTO I2C7A
I2C7F       CALL  I2C4C
I2C7D       MOVF  INDF,W     ; SEQUENC MOD
            CALL  I2C17
I2C7A       INCF FSR,F
            ;INCF LOWADR,F      ; TU CE MOZDA TREBAT DODAT I UVECANJE HIADR
            DECFSZ LOOP3,F
            GOTO I2C7D
            GOTO  I2C41
            RETURN
            ;
I2CSET     MOVF  LEN,W         ; UPIS // PRIPREMA REG
I2CSER     MOVWF  LOOP3
           MOVLW 0X2F
           MOVWF FSR
           RETURN
           ;
I2CWRX     CALL  I2CSET
           CALL  I2CWR
           GOTO  POCETAK
           ;
I2CRDX     MOVLW 0X20
           CALL  I2CSER
I2CBF      CALL  I2CRD
           MOVWF  INDF
           INCF  FSR,F
           INCF  LOWADR,F
           DECFSZ  LOOP3,F
           GOTO  I2CBF
           CALL  SEND32
           GOTO  POCETAK
           ;
         END

Definicije registara možete uraditi po vlastitoj želji.
Primjer:
LOWADR EQU 0X0F ; REGISTRY DEFINITION
HIADR EQU 0X10
SHIADR EQU 0X11
PODATAK EQU 0X19 ; PODAK ZA UPIS ILI PROCITANI IZ IC-a (DATA)

[nenoo]

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