Published on March 13, 2009
Lesson 6 Controlling the FPGA VI TOPICS A. Introduction B. FPGA Interface Functions ni.com/training
A. Introduction Common host VI tasks: • Data processing • Perform operations not available on the FPGA target • Log data • Sequence multiple FPGA VIs • Control the timing and sequencing of data transfer • Control which components are visible on the front panel window for communication ni.com/training
B. FPGA Interface Functions • Establish and terminate communication with the FPGA VI • Control the execution of the FPGA VI on the FPGA target • Read and write data to the FPGA VI • Wait for and acknowledge FPGA VI interrupts • Read DMA FIFOs ni.com/training
Open FPGA VI Reference • Opens a reference to: − Open the FPGA VI or bit file − Selects an FPGA target • Select VI and target in the shortcut menu − Or, specify target with the resource name input • Right-click and select Show Resource Name Input • Must open a reference to the FPGA target before you can communicate between the host VI and the FPGA VI. • Configure for Open or Open and Run − Use free label to describe functionality ni.com/training
Read/Write Control • Reads a value from or writes a value to a control or indicator in the FPGA VI on the FPGA target. ni.com/training
Invoke Method • Invokes method or action from a host VI • Methods: − Run − Abort − Reset − Wait on IRQ − Acknowledge IRQ − Download − Read and write DMA FIFOs ni.com/training
Close FPGA VI Reference • Stops and resets the FPGA • Right-click and select Close from the shortcut menu to close the reference without resetting • Default is Close and Reset if Last Reference, which closes the reference, stops the FPGA VI, and resets the FPGA • Use free label to describe functionality ni.com/training
Exercise 6-1 Creating an FPGA Interface Create a host VI for the custom trigger. GOAL ni.com/training
Summary • FPGA host interface functions control and communicate with the FPGA VI • Expose only necessary controls and indicators on the FPGA VI ni.com/training
Quiz 1. You communicate with the 2. Which of the following are FPGA VI is by using used for reading the which of the following: values of controls/indicators on the a. Array functions FPGA VI: b. NI-DAQmx VIs a. Open FPGA VI Reference c. FPGA Interface Vis b. Read/Write Control d. TCP/IP VIs c. Invoke Method ni.com/training
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