SPI Boot loader

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SPI Boot loader

Postby pwcguy » Wed Nov 10, 2010 1:15 pm

Well I'm trying to build an engine knock analyzer for my jet ski. Found several chips which do 90% of the work ( signal processing ). The one part I'm struggling with is power on conditions. The signal processing chip only has volatile mememory and an SPI interface which requires a few bytes to be passed to set params when powered on. So long story short looking for a simple board which has some non-volatile memory that can send a few SPI bytes when powered up. It would be even better if the bytes could be changed via USB interface.

Any help is appreciated
Mike D.
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Re: SPI Boot loader

Postby phalanx » Wed Nov 10, 2010 2:19 pm

If USB isn't necessary, this could be solved with a 6 pin PIC10F device. It could bit-bang the SPI commands to your DSP chip when it powers up.

If you need USB functionality, there are a number of PIC18F and higher parts that have hardware USB ports integrated into them. Microchip has example code that makes them appear as serial ports to a computer. All of these parts have hardware SPI functionality as well.

-Bill
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