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Add more options to spi_transfer

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This commit is contained in:
Gregory Nutt 2016-08-05 13:22:18 -06:00
parent 5407a673fc
commit 50e9a5fa33
2 changed files with 21 additions and 16 deletions
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35
drivers/spi/spi_transfer.c
View File

@ -39,6 +39,7 @@
#include <nuttx/config.h> #include <nuttx/config.h>
#include <unistd.h>
#include <assert.h> #include <assert.h>
#include <errno.h> #include <errno.h>
#include <debug.h> #include <debug.h>
@ -48,22 +49,6 @@
#ifdef CONFIG_SPI_EXCHANGE #ifdef CONFIG_SPI_EXCHANGE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/**************************************************************************** /****************************************************************************
* Public Functions * Public Functions
****************************************************************************/ ****************************************************************************/
@ -142,9 +127,27 @@ int spi_transfer(FAR struct spi_dev_s *spi, FAR struct spi_sequence_s *seq)
} }
#endif #endif
/* [Re-]select the SPI device in preparation for the transfer */
SPI_SELECT(spi, seq->dev, true);
/* Perform the transfer */ /* Perform the transfer */
SPI_EXCHANGE(spi, trans->txbuffer, trans->rxbuffer, trans->nwords); SPI_EXCHANGE(spi, trans->txbuffer, trans->rxbuffer, trans->nwords);
/* Possibly de-select the SPI device after the transfer */
if (trans->deselect)
{
SPI_SELECT(spi, seq->dev, false);
}
/* Perform any requested inter-transfer delay */
if (trans->delay > 0)
{
usleep(trans->delay);
}
} }
SPI_SELECT(spi, seq->dev, false); SPI_SELECT(spi, seq->dev, false);

2
include/nuttx/spi/spi_transfer.h
View File

@ -76,12 +76,14 @@ struct spi_trans_s
{ {
/* SPI attributes for unique to this transaction */ /* SPI attributes for unique to this transaction */
bool deselect; /* De-select after transfer */
#ifdef CONFIG_SPI_CMDDATA #ifdef CONFIG_SPI_CMDDATA
bool cmd; /* true=command; false=data */ bool cmd; /* true=command; false=data */
#endif #endif
#ifdef CONFIG_SPI_HWFEATURES #ifdef CONFIG_SPI_HWFEATURES
spi_hwfeatures_t hwfeat; /* Hard features to enable on this transfer */ spi_hwfeatures_t hwfeat; /* Hard features to enable on this transfer */
#endif #endif
uint32_t delay; /* Microsecond delay after transfer */
/* These describe the single data transfer */ /* These describe the single data transfer */