/*
* These configuration parameters specify how to clock the
* bits that are sent and received on the Cheetah SPI
* interface.
*
* The polarity option specifies which transition
* constitutes the leading edge and which transition is the
* falling edge. For example, CH_SPI_POL_RISING_FALLING
* would configure the SPI to idle the SCK clock line low.
* The clock would then transition low-to-high on the
* leading edge and high-to-low on the trailing edge.
*
* The phase option determines whether to sample or setup on
* the leading edge. For example, CH_SPI_PHASE_SAMPLE_SETUP
* would configure the SPI to sample on the leading edge and
* setup on the trailing edge.
*
* The bitorder option is used to indicate whether LSB or
* MSB is shifted first.
*
* The SS polarity option is to indicate the polarity of the
* slave select pin (active high or active low). Each of
* the lower three bits of ss_polarity corresponds to each
* of the SS lines. Set the bit value for a given SS line
* to 0 for active low or 1 for active high.
*/
// enum CheetahSpiPolarity (from declaration above)
// CH_SPI_POL_RISING_FALLING = 0
// CH_SPI_POL_FALLING_RISING = 1
// enum CheetahSpiPhase (from declaration above)
// CH_SPI_PHASE_SAMPLE_SETUP = 0
// CH_SPI_PHASE_SETUP_SAMPLE = 1
// enum CheetahSpiBitorder (from declaration above)
// CH_SPI_BITORDER_MSB = 0
// CH_SPI_BITORDER_LSB = 1
/* Configure the SPI master interface */
public static int ch_spi_configure(
int cheetah,
CheetahSpiPolarity polarity,
CheetahSpiPhase phase,
CheetahSpiBitorder bitorder,
byte ss_polarity
)
{
if (!CH_LIBRARY_LOADED)
{
return((int)CheetahStatus.CH_INCOMPATIBLE_LIBRARY);
}
return(net_ch_spi_configure(cheetah, polarity, phase, bitorder, ss_polarity));
}
private static extern int net_ch_spi_configure(int cheetah, CheetahSpiPolarity polarity, CheetahSpiPhase phase, CheetahSpiBitorder bitorder, byte ss_polarity);
