spi_send_recv
err = spi_send_recv(sh, 1, &rreg,
if (spi_send_recv(sc->sc_sh, 1, &cmd, 3, buf)) {
if (spi_send_recv(sc->sc_sh, 1, &cmd, 4, buf)) {
return spi_send_recv(ssc->sc_sh, 2, buf, 1, valp);
if (spi_send_recv(sc->sc_sh, 1, &ctrl, 2, buf) != 0) {
spi_send_recv(spi, 1, ®, 1, &ret);
error = spi_send_recv(sh, 1, &xreg, blen, buf);
error = spi_send_recv(sh,
int spi_send_recv(spi_handle_t, int, const uint8_t *, int, uint8_t *);