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msmax
Joined: 06 May 2001
Posts: 104
Location: Pays Bas
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 11 Sep 2003 19:40 Your opinion for SPI bus.. |
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Have you had good or bad experiences with SPI(CLK,Data,Enable) bus for increasing port outputs.
What set up did you have for your experience:
- bus on same board as micro?
- bus fed by 3 wire cable to seperate board from micro?
I'm using a 3 wire bus with latches to create 56 outputs on a seperate print with a cable of ~1.2 meters.
Problem is that sometimes outputs are are spontanously flashing which should not happen.
Please share your experience with me.
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eltonjohn
Joined: 22 Feb 2002
Posts: 1558
Helped: 22
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| 12 Sep 2003 5:14 Re: Your opinion for SPI bus.. |
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i implemented a spi interface in software on both sides
between a 51 micro and an early pic .. and is was very reliable !
the reason of this approach was to use the pic as a power manager
and as a watchodog for the 51 . We couldn't afford the 51 to crash and damage other machinery .. This approach was great !
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eltonjohn
Joined: 22 Feb 2002
Posts: 1558
Helped: 22
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| 12 Sep 2003 5:17 Re: Your opinion for SPI bus.. |
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I forgot to say the reasons why i chose this approach
1) the protocol does't require special circuitry . is easy to implement in
software .
2)also several devices can be addressed .
3) is more inmune to noise .. specially in industrial enviroments
So overall is a great bus !
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tjalps
Joined: 28 May 2001
Posts: 262
Helped: 2
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| 12 Sep 2003 6:03 Re: Your opinion for SPI bus.. |
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Hello!
I have used SPI comunication in many aplications( port expander MAX8301, A/D converters, FLASH,E2PROM,RTC..) and as far I'm concerned it's wery reliable at least for me.
Regards!
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pendragon
Joined: 03 Jan 2002
Posts: 88
Helped: 1
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| 19 Sep 2003 22:11 Re: Your opinion for SPI bus.. |
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Hi
I have used the SPI bus from the TMS320F240 with the PC parallel port with minimal harware, and work very well...
Best regads
Pendragon
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