diff options
Diffstat (limited to 'libmaple')
| -rw-r--r-- | libmaple/include/libmaple/spi.h | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/libmaple/include/libmaple/spi.h b/libmaple/include/libmaple/spi.h index 45dc5a2..fab643f 100644 --- a/libmaple/include/libmaple/spi.h +++ b/libmaple/include/libmaple/spi.h @@ -236,19 +236,24 @@ extern void spi_config_gpios(spi_dev *dev, /** * @brief SPI mode configuration. * - * Determines a combination of clock polarity (CPOL), which determines - * idle state of the clock line, and clock phase (CPHA), which - * determines which clock edge triggers data capture. + * A SPI mode determines a combination of the idle state of the clock + * line (the clock polarity, or "CPOL"), and which clock edge triggers + * data capture (the clock phase, or "CPHA"). */ typedef enum spi_mode { - SPI_MODE_0, /**< Clock line idles low (0), data capture on first - clock transition. */ - SPI_MODE_1, /**< Clock line idles low (0), data capture on second - clock transition */ - SPI_MODE_2, /**< Clock line idles high (1), data capture on first - clock transition. */ - SPI_MODE_3, /**< Clock line idles high (1), data capture on - second clock transition. */ + /** Clock idles low, data captured on rising edge (first transition) */ + SPI_MODE_LOW_RISING = 0, + /** Clock idles low, data captured on falling edge (second transition) */ + SPI_MODE_LOW_FALLING = 1, + /** Clock idles high, data captured on falling edge (first transition) */ + SPI_MODE_HIGH_FALLING = 2, + /** Clock idles high, data captured on rising edge (second transition) */ + SPI_MODE_HIGH_RISING = 3, + + SPI_MODE_0 = SPI_MODE_LOW_RISING, /**< Same as SPI_MODE_LOW_RISING */ + SPI_MODE_1 = SPI_MODE_LOW_FALLING, /**< Same as SPI_MODE_LOW_FALLING */ + SPI_MODE_2 = SPI_MODE_HIGH_FALLING, /**< Same as SPI_MODE_HIGH_FALLING */ + SPI_MODE_3 = SPI_MODE_HIGH_RISING, /**< Same as SPI_MODE_HIGH_RISING */ } spi_mode; /** |