spi_w8r16 — SPI synchronous 8 bit write followed by 16 bit read
ssize_t spi_w8r16 (
)
spi
device with which data will be exchanged
cmd
command to be written before data is read back
can sleep
The number is returned in wire-order, which is at least sometimes big-endian.
Callable only from contexts that can sleep.
the (unsigned) sixteen bit number returned by the device, or else a negative error code.