int ret;
	uint16_t tx[] = {
		0xD000, 0xD000,0xD000,0xD000

	};
	uint16_t rx[ARRAY_SIZE(tx)] = {0, };
	struct spi_ioc_transfer tr = {
		.tx_buf = (unsigned long)tx,
		.rx_buf = (unsigned long)rx,
		.len =2*ARRAY_SIZE(tx),
		.delay_usecs = delay,
		.speed_hz = speed,
		.bits_per_word = bits,


	};


	ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);