rpi-led-control.js
function shutdown(addr, b) {
	    if(addr<0 || addr>=maxDevices)
			throw 'address out of range';
			
	    if(b)
			spiTransfer(addr, OP_SHUTDOWN,0);
	    else
			spiTransfer(addr, OP_SHUTDOWN,1);
	}
function shutdown(addr, b) {
	    if(addr<0 || addr>=maxDevices)
			throw 'address out of range';
			
	    if(b)
			spiTransfer(addr, OP_SHUTDOWN,0);
	    else
			spiTransfer(addr, OP_SHUTDOWN,1);
	}
shutdown puts it into power saving sleep mode. call with false to wake it up.