esp32 spi low level

while (*_spi_cmd&SPI_USR);
for (i=0; i < rem; ++i) *spi_w++ = val32;
*_spi_mosi_dlen = (rem << 3) - 1;
*_spi_cmd = SPI_USR;
if (!count) return; //{while (*_spi_cmd&SPI_USR); return; }
i = i>>1; while(i++<8) *spi_w++ = val32;
...
if(spi_mode==1||spi_mode==2) {
    *_spi_user = SPI_USR_MOSI | SPI_USR_MISO | SPI_DOUTDIN | SPI_CK_OUT_EDGE;
} else {
    *_spi_user = SPI_USR_MOSI | SPI_USR_MISO | SPI_DOUTDIN;
}
...