Отправлено si 25 августа 2003 г. 20:41 В ответ на: Подскажите пожалуйста..как в конверторе ADUC814 заставить spi работать в slave режиме? отправлено Грыжа 25 августа 2003 г. 17:19

;======================================================================
;
; Author : ADI - Apps www.analog.com/MicroConverter
;
; Date : 30 April 1999
;
; File : slave.asm
;
; Hardware : ADuC812
;
; Description : Code for a slave in an I2C system.
;
; Reference : Tech Note, uC001: "Using the ADuC812 I2C Interface"
; find it at www.analog.com/microconverter
;
;======================================================================

$MOD812 ; use ADuC812 & 8052 predefined symbols

BYTECNT DATA 030h ; byte counter for I2C routines

FLAGS DATA 28h
GO BIT FLAGS.0 ; flag for all the interrupts
RC BIT FLAGS.1 ; flag for Write mode interrupt
TR BIT FLAGS.2 ; flag for Read mode interrupt

;======================================================================

CSEG

ORG 0000H

JMP START

;======================================================================

ORG 003Bh ; I2C slave interrupt

JB RC,RECEIVE ; depending on flags there
JB TR,TRANSMIT ; are two different interrupts

;======================================================================

ORG 007BH ; Subroutines

;----------------------------------------------------------------------
; RECEIVE: receive interrupt routine
;----------------------------------------------------------------------

RECEIVE:
SETB GO
MOV @R1,I2CDAT ; move data on internal RAM
CLR I2CI ; clear interrupt bit
RETI

;----------------------------------------------------------------------
; TRANSMIT: transmit interrupt routine
;----------------------------------------------------------------------

TRANSMIT:
SETB GO
MOV I2CDAT,R0
CLR I2CI ; clear interrupt bit
RETI

;----------------------------------------------------------------------
; RCVBYTE2: receive byte routine for read mode
;----------------------------------------------------------------------

RCVBYTE2:

NOP
RET

;----------------------------------------------------------------------
; RCVBYTE: receive byte routine
;----------------------------------------------------------------------

RCVBYTE:

JNB GO,$ ; wait for the interrupt
INC R1 ; next storage will be on 41h then 42h
CLR GO ; flag cleared for the next interrupt
RET

;----------------------------------------------------------------------
; RCVDATA: receive bytes routine
;----------------------------------------------------------------------

RCVDATA:

MOV BYTECNT,#4 ; 4 bytes : address + 3 datas
LOOP2: ACALL RCVBYTE
DJNZ BYTECNT,LOOP2
RET

;----------------------------------------------------------------------
; SENDBYTE: byte transmit routine
;----------------------------------------------------------------------

SENDBYTE:

JNB GO,$ ; wait for the interrupt
INC R0 ; 2nd data is 34h and 3rd data is 35h
CLR GO
RET

;----------------------------------------------------------------------
;SENDATA:bytes transmit routine
;----------------------------------------------------------------------

SENDATA:

MOV BYTECNT,#3 ; 3 data will be send by the slave
LOOP: ACALL SENDBYTE
DJNZ BYTECNT,LOOP
RET

;======================================================================
;Main program
;======================================================================

START:

CLR GO ; clear flag used in the interrupt
MOV I2CADD,#044h ; slave address
MOV SP,#020h
MOV IE,#80h ; enable all the interrupts
MOV IE2,#01h ; enable I2C interrupt
MOV I2CCON,#000h ; slave mode

; code for write mode ( master-transmitter to slave-receiver )

; SETB RC ; specific flag for interrupt routine
; MOV R1,#040h ; first data to be stored in RAM at 40h
; ACALL RCVDATA ; slave receives his address + 3 datas

; code for read mode ( master reads slave immediately after 1st byte )

SETB RC ; specific flag for interrupt routine
MOV R0,#033h ; first data send is 33h
ACALL RCVBYTE2 ; slave receives address send by master
CLR RC
SETB TR
ACALL SENDATA ; slave sends 3 datas

CLR P3.4 ; led is off, everything is OK

END

• Ответ: это для i2c app, нужен spi slave...но все равно спасибо:) — Грыжа   (26.08.2003 00:12, пустое)