Sending 10 bits using arduino SPI

Projects Programming
1

Hi guys

i want to send 10 bits of data to DAC through SPI protocol. how can i do that?
i have tried
SPI.transfer(highByte(DATA))
SPI.transfer(lowByte(DATA))
this does not seems to work.
kindly help me out

Thanks in advance

2

What DAC?

3

thank you for your fast reply
the dac is DAC101S101.
please help me out i am stuck in my project here.

4

See section 8.5 of the datasheet - you send two bytes, but you don't pack them like that - it's 2 dont-care bits, 2 setting the mode, 10 data bits, then the two more don't care bits

So...

byte mode = //put the mode number here. 
byte firstbyte=(mode << 4)|(DATA>>6) 
byte secondbyte=DATA<<2

and then send the two bytes.

5

Thank you SO much for help.

can you please verify is this right if yes than its not working.if not can you please
modify the code i want the mode to be 1 or 0 or 2 or 3.
i have tried mode=0b00000000 as well.

int DATA=0b1111111111;

byte mode = 1; //put the mode number here.

byte firstbyte=(mode << 4)|(DATA>>6);
byte secondbyte=DATA<<2 ;

SPI.transfer16(firstbyte);
SPI.transfer16(secondbyte);