sub_spi_config

Configure SUB-20 SPI module or read current configuration. If *cfg_get is NULL function will configure SPI according to the cfg_set parameter. Otherwise it will read current SPI configuration into *cfg_get

•cfg_set - Desired SPI configuration. This parameter is effective only if *cfg_get is NULL. cfg_set should be assembled as a combination of below flags

SPI_ENABLE	Enable SUB-20 SPI module.
SPI_SLAVE	SPI module is in Slave mode. sub_spi_transfer can work only when SPI module is in Master mode

SPI_CPOL_RISE	SCK is low when idle. See SPI Polarity and Phase explanations
SPI_CPOL_FALL	SCK is high when idle. See SPI Polarity and Phase explanations

SPI_SMPL_SETUP	Sample data on leading SCK edge, setup on trailing. See SPI Polarity and Phase
SPI_SETUP_SMPL	Setup data on leading SCK edge, sample on trailing. See SPI Polarity and Phase

Below flags are relevant only for SPI master mode (SPI_SLAVE not set)

SPI_LSB_FIRST	Transmit LSB first
SPI_MSB_FIRST	Transmit MSB first

SPI_CLK_8MHZ	SPI SCK frequency 8 MHz
SPI_CLK_4MHZ	SPI SCK frequency 4 MHz
SPI_CLK_2MHZ	SPI SCK frequency 2 MHz
SPI_CLK_1MHZ	SPI SCK frequency 1 MHz
SPI_CLK_500KHZ	SPI SCK frequency 500 KHz
SPI_CLK_250KHZ	SPI SCK frequency 250 KHz
SPI_CLK_125KHZ	SPI SCK frequency 125 KHz

Beginning from FW version 0.3.3 and library version 0.1.12.25 lower SPI frequencies (down to 4KHz) are supported for SPI Master transfer with sub_spi_transfer function. Special SPI_CLK_HZ(FHZ) macro defined in libsub.h, where FHZ parameter denotes SPI frequency in Hz. Supported frequencies range is 100.000Hz .. 4000Hz. Exact frequency may differ from requested due to integer rounding in division.

•*cfg_get - Pointer to store current configuration read from SUB-20 device or NULL

sub_spi_config( hndl, SPI_ENABLE|SPI_CPOL_RISE|SPI_SMPL_SETUP|SPI_MSB_FIRST|SPI_CLK_4MHZ, 0 );