| Author |
Message |
prav
Guest
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 Posted:
Tue Dec 28, 2004 3:18 pm Post subject:
Regarding SPI protocol( master) |
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Hi all,
I have a basic doubt in SPI protocol.Suppose if i have a SPI master
which only transfers data to a slave but does not receive any data
from slave.
Is it possible in SPI protocl to enable only the Transmitter and
disable the receiver.
Thanks in advance,
Prav |
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Paul E. Bennett
Guest
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| Posted:
Tue Dec 28, 2004 3:40 pm Post subject:
Re: Regarding SPI protocol( master) |
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prav wrote:
| Quote: | Hi all,
I have a basic doubt in SPI protocol.Suppose if i have a SPI master
which only transfers data to a slave but does not receive any data
from slave.
Is it possible in SPI protocl to enable only the Transmitter and
disable the receiver.
|
I would consider that the slave should at least send an ACK to indicate
that it received the transmission OK. However, if your system will live
without the ACKs then I suppose that missing out the receive section on the
master would be OK.
--
********************************************************************
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Forth based HIDECS Consultancy .....<http://www.amleth.demon.co.uk/>
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Tel: +44 (0)1235-811095 .... see http://www.feabhas.com for details.
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
******************************************************************** |
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peterk
Guest
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| Posted:
Tue Dec 28, 2004 4:04 pm Post subject:
Re: Regarding SPI protocol( master) |
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You can ignore the returned data from the slave if you want to and the
data line does not need to be connected. If you were hoping to use the
serial data input pin for something else on your processor then you
might be disappointed. If you study your datasheets carefully then you
may find that selecting SPI mode will allocate that pin.
<hackmode>
If you desperately want to save on I/O pins you could put an unrelated
signal on SDI and clock the data in when you want to read the pin.
</hackmode>
Peter |
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Brett Foster
Guest
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| Posted:
Tue Dec 28, 2004 8:15 pm Post subject:
Re: Regarding SPI protocol( master) |
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peterk wrote:
| Quote: | You can ignore the returned data from the slave if you want to and the
data line does not need to be connected. If you were hoping to use the
serial data input pin for something else on your processor then you
might be disappointed. If you study your datasheets carefully then you
may find that selecting SPI mode will allocate that pin.
|
If you wanted to use it as an input for some other signal you may not
have the same trouble. For example, for AVR, you can still sample PINx
because the only constraint is that MISO is an input.
| Quote: |
hackmode
If you desperately want to save on I/O pins you could put an unrelated
signal on SDI and clock the data in when you want to read the pin.
/hackmode
Peter
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