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This is a very good explanation regarding SPI interface (including mode 0 -3)
It's specific for AVR microcontrollers but you can learn a lot.
**broken link removed**
For code you must be more concise. As you read above the interconnection between two SPI devices always happens between a master device and a slave device. Which one you would like to be ? You mentioned "dsp/mcu/eeprom"
Both of them using slave 25XXX SPI EEPROM series with nice snap shoots on logic analyzer screen.
The Microchip's funs on the forum will point out a better explanation for SPI.
Just because the SPI interface was established by Microchip, thus the best explanation of the interface must come from them.
If you're a really Microchip fun can you post a link from Microchip web site where it's clearly explained the ISP interface, but not specific to a device. It must be general reference. And definitely a link not kick and run.
BTW we are here to help each other and not earning or accumulating points.
You can even gain some friends.
But not with such kind of answers.
You know I've just pass through my favorite supermarket. And guess what ?
They just got in stock my lovely microcontroller.
Look at kachuisa's advice too. He just pass through my favorite supermarket, too
Oh, yeah I've just been there, I look around for a while, but I've forgot the shelf with your application note. Yeah, you better take a look too. And do not mind if you don't find it. And tomorrow is a day.
SPI is a trademark of Motorola so if you are looking for the protocol description visit them.
What kind of controller are you using?
I think that SPI is the most easiest protocol there is.. much easier than i²c, 1Wire, CAN, or even standard serial data from any uart. the only pitfall is the idle state. and the phase of the clock signal, every chip has its own.
oh, i had some problems with spi, some chips are using the CS line to initiate a spi cycle. Read your datasheets and you'll find out.
i'm using 25lc640 to send a boot image to a dsp (VS1011 mp3 codec). i haven't got any controller, just the 25lc640 programmed with the boot image, the codec, and one mmc card with spi interface. i think the dsp requests the boot image on reset and then it works standalone. but anyway i need to understand the spi interface to achieve functionality.
both those devices will have a chip select or device select pin. by controlling the logic state on that pin, u can connect them on same SPI.. u should disable one device while communicating with other..
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