Arduino - SPI - DAC converter

Question

Hi friends,
I am completely new in labview coding. I have an arduino nuo chip, connected with a DAC converter, AD5504, Analog Devices, and an operational amplier (OPA551, Texas Instruments) circuit to generate voltage output for piezoelectric firing. The wanted voltage output ranges in 0 - 60 v. However, under my coded program, there is either no voltage output or very low output, like 1.5 V. In the rare case of low voltage output, the voltage is not changable, by applying either digital write () or PWM write pin (). In the attached vi it gives error 5004 at running. Please look through my coding and help me figure it out.
The pin assignments are:
piezo_select = 3; //Relay that switches between piezos
go_button = 5; //piezo/wire button
clr = 6; 
sync = 10;
ldac = 7;
alarm = 8;
r_sel = 9;
led = 2.
This is urgent so a quick favor is needed.
Thanks.
Attachments:
Piezo controller - v2.vi ‏445 KB

Answer 1

The error is 5004, occurred at 'SPI data'.
ERR5004: SPI Send Receive.  The word size is invalid for the number of SPI bytes to be sent.  The number of SPI bytes to send must be divisible by the SPI word size.
Please see attached PNG block diagram
Attachments:
Piezo_controller_-_v2d.png ‏21 KB