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Refresh submodules + Update comments in SPI slave header file

This commit is contained in:
Gregory Nutt 2015-08-11 07:56:26 -06:00
parent 7d04104485
commit 7791b2a62e
3 changed files with 6 additions and 4 deletions
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2
arch

@ -1 +1 @@
Subproject commit 6190d664666b19580969c4e620646ef4e54f0182
Subproject commit da550063e6081057d2324b76c8ac065ed6fe1d6f

2
configs

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Subproject commit ac4035687c824bb4a573e06feb017cb4f3ce7626
Subproject commit c779f69eb4070272ef136a27124223bddafec5a1

6
include/nuttx/spi/slave.h
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@ -398,8 +398,10 @@
* the first word send is a command to read or write something following
* by a sequence of transfers to implement the write. So you have very,
* very limited time window to setup the correct DMA to respond to the
* command. DMA setup time can be longer. And I am not sure it I can
* make it reliable.
* command. I am not certain that it can be done reliably.
*
* Inserting dummy words into the protocol between the first command word
* and the remaining data transfer could allow time to set up the DMA.
*
* 3) I mentioned that you do not know the size of the transfer in advance.
* If you set up the DMA to terminate to soon, then you lose the last part