diff options
Diffstat (limited to 'nuttx/include/nuttx/spi.h')
| -rw-r--r-- | nuttx/include/nuttx/spi.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/nuttx/include/nuttx/spi.h b/nuttx/include/nuttx/spi.h index 12d9b0aee..a29fd0a78 100644 --- a/nuttx/include/nuttx/spi.h +++ b/nuttx/include/nuttx/spi.h @@ -188,6 +188,34 @@ #define SPI_STATUS_WRPROTECTED 0x02 /* Bit 1=1: MMC/SD card write protected */ /**************************************************************************** + * 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 + * + ****************************************************************************/ + +#ifndef CONFIG_SPI_CMDDATA +# define SPI_CMDDATA(d,id,cmd) ((d)->ops->cmddata(d,id,cmd)) +#endif + +/**************************************************************************** * Name: SPI_SEND * * Description: @@ -348,6 +376,9 @@ struct spi_ops_s void (*setmode)(FAR struct spi_dev_s *dev, enum spi_mode_e mode); void (*setbits)(FAR struct spi_dev_s *dev, int nbits); uint8_t (*status)(FAR struct spi_dev_s *dev, enum spi_dev_e devid); +#ifndef CONFIG_SPI_CMDDATA + int (*cmddata)(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd); +#endif uint16_t (*send)(FAR struct spi_dev_s *dev, uint16_t wd); #ifdef CONFIG_SPI_EXCHANGE void (*exchange)(FAR struct spi_dev_s *dev, FAR const void *txbuffer, |