RSPI_SPCMD0
rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
#define RSPI_SPCMD(i) (RSPI_SPCMD0 + (i) * 2)