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help in spi function

 
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zero2004



Joined: 18 Aug 2013
Posts: 2

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help in spi function
PostPosted: Sun Aug 18, 2013 11:26 pm     Reply with quote
Hi every one

I want flip the initial spi clock state to be hi instead of low, i declare the spi function as follow
Code:
#USE SPI (MASTER, SPI1, CLOCK_HIGH=1, CLOCK_LOW=1, MODE=0, BITS=8, LOAD_ACTIVE=1, STREAM=SPI_1, MSB_FIRST)


Thanks for your help
Ttelmah



Joined: 11 Mar 2010
Posts: 19520

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PostPosted: Mon Aug 19, 2013 12:43 am     Reply with quote
The mode number specifies the 'idle' (initial) state. Mode0, idles low. Modes 2 and 3 idle high.
Code:

USE SPI (MASTER, SPI1, MODE=3, BITS=8, LOAD_ACTIVE=1, STREAM=SPI_1, MSB_FIRST)

Have a look at:
<http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus>

Look at 'CPOL' (clock polarity), and the effect of the mode numbers on this.

Best Wishes
zero2004



Joined: 18 Aug 2013
Posts: 2

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PostPosted: Tue Aug 20, 2013 12:50 am     Reply with quote
Thanks
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