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changing polarity off the sclk spi bus at runtime

 
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Tiny

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Joined: 10 Nov 2010
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Location: The Netherlands

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PostPosted: Mon Nov 24, 2014 8:33 pm    Post subject: changing polarity off the sclk spi bus at runtime Reply with quote

Hello,

i want to communicate with a MS5541C spi pressure senser.

but there for i need to change the polarity off the SCLK after sending 16 bits to read back the data.

how can i do that?

Regards Tiny

(BASCOM-AVR version : 2.0.7.7 )
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MWS

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Joined: 22 Aug 2009
Posts: 1827

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PostPosted: Mon Nov 24, 2014 10:16 pm    Post subject: Reply with quote

If it's an XMega, do a re-Config, if it's for example an ATMega32, the bit CPOL in SPCR is responsible for clock polarity, depending on the sensors data sheet, you need to check CPHA too.
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Tiny

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PostPosted: Mon Nov 24, 2014 10:35 pm    Post subject: Reply with quote

sorry i forgot to tell which chip it was, it is a atmega644a
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MWS

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PostPosted: Mon Nov 24, 2014 11:14 pm    Post subject: Reply with quote

Tiny wrote:
sorry i forgot to tell which chip it was, it is a atmega644a

Also the ATMega644A has a datasheet and the registers and config-bits even have the same name. Wink
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Tiny

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PostPosted: Tue Nov 25, 2014 6:39 am    Post subject: Reply with quote

Thank you, i found it
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Tiny

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Joined: 10 Nov 2010
Posts: 89
Location: The Netherlands

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PostPosted: Tue Nov 25, 2014 6:40 am    Post subject: Reply with quote

Thank you, i found it
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