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sample code ISD1790

 
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lastweapon
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sample code ISD1790
PostPosted: Mon Oct 27, 2008 6:03 am     Reply with quote
I can't to control ISD1790 by SPI interface.
I don't know why.

i send 0x40 to ISD1790 voice not responding but ISD1790 return value to PIC

any one have sample code


thanks.

reg.
RLScott



Joined: 10 Jul 2007
Posts: 465

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Re: sample code ISD1790
PostPosted: Mon Oct 27, 2008 8:02 am     Reply with quote
lastweapon wrote:
...i send 0x40 to ISD1790 voice not responding but ISD1790 return value to PIC...

Have you taken into account the fact that the ISD1790 treats SPI data as LSB first while normal SPI is sent using MSB first? That requires a bit reversal if you are using normal SPI hardware or software.
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Robert Scott
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Embedded Systems Consulting
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Mon Oct 27, 2008 12:32 pm     Reply with quote
There is an example of how to do bit reversal with SPI at the end of
this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=35566&highlight=bit+reversal
lastweapon
Guest
PostPosted: Tue Oct 28, 2008 3:44 am     Reply with quote
I use 18f8722.
SPI use:
rc4 datain
rc5 dataout
rf7 SS
rc3 clock

I use interrupt SPI data in I can get someting when I push play button
but I can't control by MCU.

I'll try it again.

Thanks every one.

reg.
lastweapon
Guest
PostPosted: Wed Oct 29, 2008 10:54 am     Reply with quote
OK. now I can control ISD1790.

I use bit reversal and it can play.

Thank PCM programmer and everyone.

When I complete the code I'll be back to post it.

reg.
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