void next(void){
    for(uint8_t j=0; j<8; j++){
        CS_L;
        spi.transfer(j+1);
        spi.transfer(0xFF);
        CS_H;

        CS_L;
        for(uint8_t i=0; i<3; i++){
            spi.transfer(0x00);
        };
        CS_H;
        delay(0xFFFF);
    };
};