init

tuSendBuf[0] = 0x84; // 0b10000110 -- Channel 0 and 0-3xvref range Single Ended
tuSendBuf[1] = 0x88; // 0b10001000 -- Channel 0 and External Clock Mode Control
//tuSendBuf[2] = 0x80; // 0b10000000 -- Channel 0 Start Conversation
tuRes = spiTransfer(tuSendBuf,tuRecBuf,1,file);

tuSendBuf[0] = 0x88; // 0b10001000 -- Channel 0 and External Clock Mode Control
tuRes = spiTransfer(tuSendBuf,tuRecBuf,1,file);