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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-12-03 01:37:56 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-12-03 01:37:56 +0000 |
commit | 5076c4bb878881610884750c5a8fd43bdf99c471 (patch) | |
tree | c28e5e59c702dfc7394e9d365b9bcb7c3209b7ea /nuttx/configs/mcu123-lpc214x/src | |
parent | 42a5fb251254f855b5f3911337d56f0cccfcc37f (diff) | |
download | px4-nuttx-5076c4bb878881610884750c5a8fd43bdf99c471.tar.gz px4-nuttx-5076c4bb878881610884750c5a8fd43bdf99c471.tar.bz2 px4-nuttx-5076c4bb878881610884750c5a8fd43bdf99c471.zip |
Add cmddata method to the SPI interface
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3157 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/configs/mcu123-lpc214x/src')
-rw-r--r-- | nuttx/configs/mcu123-lpc214x/src/up_spi.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/nuttx/configs/mcu123-lpc214x/src/up_spi.c b/nuttx/configs/mcu123-lpc214x/src/up_spi.c index d8ae8baf8..0c32fc6db 100644 --- a/nuttx/configs/mcu123-lpc214x/src/up_spi.c +++ b/nuttx/configs/mcu123-lpc214x/src/up_spi.c @@ -129,6 +129,9 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock); static void spi_select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected); static uint32_t spi_setfrequency(FAR struct spi_dev_s *dev, uint32_t frequency); static uint8_t spi_status(FAR struct spi_dev_s *dev, enum spi_dev_e devid); +#ifdef CONFIG_SPI_CMDDATA +static int spi_cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd); +#endif static uint16_t spi_send(FAR struct spi_dev_s *dev, uint16_t ch); static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const void *buffer, size_t nwords); static void spi_recvblock(FAR struct spi_dev_s *dev, FAR void *buffer, size_t nwords); @@ -145,6 +148,9 @@ static const struct spi_ops_s g_spiops = .select = spi_select, .setfrequency = spi_setfrequency, .status = spi_status, +#ifdef CONFIG_SPI_CMDDATA + .cmddata = spi_cmddata, +#endif .send = spi_send, .sndblock = spi_sndblock, .recvblock = spi_recvblock, @@ -311,6 +317,38 @@ static uint8_t spi_status(FAR struct spi_dev_s *dev, enum spi_dev_e devid) } /**************************************************************************** + * Name: spi_cmddata + * + * Description: + * Some devices require and additional out-of-band bit to specify if the + * next word sent to the device is a command or data. This is typical, for + * example, in "9-bit" displays where the 9th bit is the CMD/DATA bit. + * This function provides selection of command or data. + * + * This "latches" the CMD/DATA state. It does not have to be called before + * every word is transferred; only when the CMD/DATA state changes. This + * method is required if CONFIG_SPI_CMDDATA is selected in the NuttX + * configuration + * + * Input Parameters: + * dev - Device-specific state data + * cmd - TRUE: The following word is a command; FALSE: the following words + * are data. + * + * Returned Value: + * OK unless an error occurs. Then a negated errno value is returned + * + ****************************************************************************/ + + #ifdef CONFIG_SPI_CMDDATA +static int spi_cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd) +{ +# error "spi_cmddata not implemented" + return -ENOSYS; +} +#endif + +/**************************************************************************** * Name: spi_send * * Description: |