The setcfg function changes the configuration of specific devices on the SPI bus. The prototype for this function is:
int setcfg( void *hdl, uint16_t device, spi_cfg_t *cfg );
The arguments are:
typedef struct { uint32_t mode; uint32_t clock_rate; } spi_cfg_t;
This function must return EOK, or EINVAL if either the device ID or the configuration is invalid.