ISD2560 problem

[Piotrne]

Hello,

I have a problem controlling the ISD2560 audio recorder,
connected to a microcontroller (Atmel Mega 32). I have recorded
several messages and they are correctly played back in push button
mode. But I need to play one specified message, not all of them.

The ISD2560 works now with A4(M4) = A8 = A9 = 1, A0(M0) controlled
by the microcontroller (signal name: Isd_m0), with the rest of Ax = 0.
The microcontroller controls inputs: P/!R (Isd_pr), PD (Isd_pd),
!CE (Isd_ce).

According to the documentation, the general idea of playing back the
n-th message is as follows:
- "Rewind" the memory to the beginning (a positive pulse to the PD),
- Turn on "fast-playing" (M0=1) while !CE = 1,
- Pulse CE (1 -> 0 -> 1) n-1 times,
- Enable normal playback (M0 = 0),
- Pulse !CE once.

Unfortunately, the effects are rather random: some message is played
(or sometimes not), but not the one which I want. Delays between line
changes affect the behavior. How should this be done properly?
The following code in Bascom should do this job (but doesn't).
In the original code, there is a delay (waitms 1) after each assignment.

Isd_pr = 1
Isd_pd = 0
Isd_pd = 1
Isd_pd = 0

For i = 2 To n
Isd_m0 = 1
Isd_ce = 0
Isd_ce = 1
Next i

Isd_m0 = 0
Isd_ce = 0
Isd_ce = 1


Regards
Piotr

 

[Piotrne]

Piotrne writes:

I have a problem controlling the ISD2560 audio recorder,

Problem solved - see discussion on sci.electronics.design.

P.