Winbond ISD1700 Voice Recorder

[milestag]

Yes, bit-banged.

The ISD1700 chips are tempermental to say the least. I have it working fine in my project, but there are some undocumented problems with this chip. Overall the documentation is inconsistent/poor and difficult to find current versions. I found out after a year of using this chip that I had the outdated datasheets.

Also, the development systems were redesigned when it moved from Winbond to Nuvoton. And the Winbond hardware does not work with Nuvoton software, so if you were unlucky to buy the early ones, you get to buy it all over again (or you just design your own). I like this chip, but Nuvoton does not help with the problems.

As for SPI, I have worked with the ISD1700 and another SPI device connected to the same PIC micro. Each device uses the complete opposite SPI communications format. The logic levels are inverted and the MSB/LSB is reversed on each device. I don't know which way is "standard" for SPI. So you may want to try changing MSB/LSB data and try inverting various signals (clock, data, chip select).

Otherwise the code examples in previous posts on this thread should be a good head start.

[RussMartin]

The ISD1700 chips are tempermental to say the least. I have it working fine in my project, but there are some undocumented problems with this chip. Overall the documentation is inconsistent/poor and difficult to find current versions. I found out after a year of using this chip that I had the outdated datasheets.

They are indeed temperamental. The timing information in the data sheets may be off by as much as 25%, and this is different from one device model to the next.

I've been working with one for the past 2 weeks . . .

[ams0178]

Hello All,

I've made some progress. At least the MISO pin is "singing" with 1's and 0's. But I can't seem to get the chip to record or play. I'm using the LED off of pin 2 as an indicator. I even put a test probe and monitored the pin 2 just in case the LED was put in backwards.

I also started monitoring pins for more "foolproof" software rather than guessing at delays. One of the things I realized that after sending the record command, 0x51 (bit 4 set for LED) and 0x00 (data byte), the interrupt bit in SR0 never gets set. And according to the datasheet I believe it's suppose to get set after executing that command. I also tried sending the stop command right after the record command, thinking that maybe the interrupt bit is set after the record command is stopped, and this still doesn't result in the interrupt bit being set.

I just want to make sure I'm using the latest datasheet. Is revision 1.1 from May 2007 the latest?

Thanks, Alan

[RFEFX]

Hey ams,
you stated in a previous post something about using C programming. are you even using Picbasic Pro for your pic project or you trying to do this in C?

what is the size of your ISD device you stated its a 1700 but no size specified. this is important as you need to know the start and end addresses of the messages you are trying to record.

If you haven't seen my post #30 i definitely recommend the Cowlacious Designs ISD board. http://www.cowlacious.com/AudioProd.htm

-RFEFX

[RFEFX]

On my very first post i linked the Design guide.

the design guide is different from the datasheet as it gives you vital ISP codes and timing information.

Make sure you are referring to the design guide and not the data sheet.

Unless Nuvaton changed this....

but then again, my project is working... (no offense)

if you are using Picbasic you mind posting some of your code so that some of us may analyze it? I'm sure Jerson can dissect it in his sleep (again no offense)

[ams0178]

RFEFX,

Yes I'm using C to program. I figured this post was as much about interfacing with the ISD17000 and using that hardware, that it was okay to post my question(s) as long as I leave the actual programming out of it. If it's not, just let me know.

Yes, I've been using your Post 30 as a guide for the SPI interface. Thanks for your work. It's been a great start and will definitely help.

I'm working with a custom PCB I built. I'm still on rev 1, so we'll see how good of a PCB designer I am

I'm also using the 17240 chip. I'm only using the generic record and play commands at this point. Would their be a reason I can't do this?

Alan

[ams0178]

RFEFX,

I'm actually using a later version of the design guide. If you or anyone for that matter wants a later version, send me a PM with your email and I can email you the PDF.

Alan

[Ioannis]

I have version 1.31, Nov. 6, 2008.

Ioannis