SPI (isd4002) problem

Forum 2005-2010 (read only) Hardware Interfacing
1

Hello guys.
I am trying to interface my arduino (actually it's an atmega328 programmed via the arduino IDE) to the isd 4002, which is a record/playback IC. All this with SPI.

I still had no luck making it work, but i'd say the hardware part is correct, since i have succesfully made it work with my picaxe board.

This is the code i use:

void setup(){
  byte clr;
SPCR=B01010011;
clr=SPSR;
clr=SPDR;

   delay(10);
   digitalWrite(10, LOW);  //10 is basically the SLAVE SELECT pin
   delay(10);
spi_transfer(B00000100); //powerup
delay(10);
   digitalWrite(10, HIGH);
   delay(10);

delay(1);
   digitalWrite(10, LOW);
   delay(10);
spi_transfer(B00000000);  //setrec
spi_transfer(B00000101);
delay(10);
   digitalWrite(10, HIGH);
   delay(10);

[...]

delay(10);
   digitalWrite(10, LOW);
   delay(1);
spi_transfer(B00001010); //STOPPWRDN com
delay(10);
   digitalWrite(10, HIGH);
   delay(10);
}
void loop(){}

void spi_transfer(volatile char data)
{SPDR=data;
while(!(SPSR & (1<<SPIF)))
{};
}

As you can see i desperately inserted a lot of delays to see if it would work. I've also tried using the Spi library (Arduino Playground - Spi) in default mode, and it didn't work. I've also tried using shiftOut and still no luck. The latest arrangements were taken from here:http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1213217330/5#5 and they include the spi_transfer function you can see at the end and the SPCR which is set at the beginning.

I don't know if it helps, but the picaxe code uses hardware spi set to mode 00 ((CKP=0, CKE=1, SMP=0) as written on the manuals) and it's quite similar to the above program, only that instead of spi_transfer it has hspiout (not defined by me).

I can't understand what's wrong :frowning:

Thanks for your help!

2

I haven't used this device but have just had a look at the data sheet. It says all instructions are 16 bits long. So why have you got some 8 bit transfers?
Yes you have two 8 bit transfers at :-
delay(10);
spi_transfer(B00000000); //setrec
spi_transfer(B00000101);
delay(10);
But you have only 8 bit transfers at:-
delay(1);
spi_transfer(B00001010); //STOPPWRDN com
delay(10);
Just because the data sheet shows this command as:-
0X01X
doesn't mean you can just ignore those register bits, you still have to clock them it, it is just that the chip will not do anything with them.

3

alright i'll try. Still with the picaxe it works fine if i send just 8 bits for those functions that do not need an address.

UPDATE: It still doesn't work. I've added a "spi_transfer(B00000000);" before the commands that were only sending one byte.