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04/14/12 13:33
Read: 602 times


 
#187142 - ISD5116 Question
Greetings all,

I have a simple recorder play back circuit that uses an ISD5116 recorder IC. I have run into a problem that I'm having trouble getting past. I have written an asm code to record and play back (that part works great)the message. The problem I'm having is the read status command, when I send the command to the IC the EOM line does not go back to logic high. I suspect that the problem is simple but, I cannot figure out what the problem is with my code. I have included the play part of the code to this message. I would greatly appreciate any advice you may have on this.

; ==========From current address playback====================

PLAYP:
LCALL i2cstart
MOV A,#080H; 10000000 (write) from the address
LCALL i2cwrite
MOV A,#0A9H; Transmission playback address instruction
LCALL i2cwrite
MOV A,#00H; Transmission playback address high byte
LCALL i2cwrite
MOV A,#00H; Transmission playback address low byte
LCALL i2cwrite
NOP
NOP
SETB SCL
NOP
NOP
LCALL i2cstop
PLAY1: CLR LED
LCALL i2cstart
MOV A,#080H; 10000000 (write) from the address
LCALL i2cstart
MOV A,#0A8H; Playback start
LCALL i2cstart
NOP
NOP
SETB SCL
NOP
NOP
LCALL i2cstop
WAIT1: JNB EOM, RSTAT
SJMP WAIT1

RSTAT: LCALL i2cstart
MOV A, #081H
LCALL send
LCALL recv
LCALL recv
LCALL recv
LCALL i2cstop
LJMP START


i2c read and write code

recv:
mov r7,#08
back2:
setb sda
setb scl
nop
nop
nop
mov c,sda
rlc a
clr scl
nop
nop
nop
djnz r7,back2
setb sda
clr scl
nop
nop
nop
clr sda
setb scl
nop
nop
nop
clr scl
nop
nop
nop
mov @r0,a
inc r0
ret

send:
mov r7,#08
back:
clr scl
nop
nop
nop
rlc a
mov sda,c
setb scl
nop
nop
nop
clr scl
nop
nop
nop
djnz r7,back
setb sda
setb scl
nop
nop
nop
nop
clr scl
nop
nop
nop
ret


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