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Tiny
Joined: 10 Nov 2010
Posts: 101
Location: The Netherlands
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 Posted: Mon Nov 24, 2014 8:33 pm Post subject: changing polarity off the sclk spi bus at runtime |
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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
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Mon Nov 24, 2014 10:16 pm Post subject: |
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| 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
Joined: 10 Nov 2010
Posts: 101
Location: The Netherlands
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| Posted: Mon Nov 24, 2014 10:35 pm Post subject: |
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| sorry i forgot to tell which chip it was, it is a atmega644a |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Mon Nov 24, 2014 11:14 pm Post subject: |
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| 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.  |
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Tiny
Joined: 10 Nov 2010
Posts: 101
Location: The Netherlands
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| Posted: Tue Nov 25, 2014 6:39 am Post subject: |
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| Thank you, i found it |
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Tiny
Joined: 10 Nov 2010
Posts: 101
Location: The Netherlands
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| Posted: Tue Nov 25, 2014 6:40 am Post subject: |
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| Thank you, i found it |
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