Controlling Software - 2021.2 English

Vitis High-Level Synthesis User Guide (UG1399)

Document ID
UG1399
ft:locale
English (United States)
Release Date
2021-12-15
Version
2021.2 English

The API functions can be used in the software running on the CPU to control the hardware block. An overview of the process is:

  • Create an instance of the hardware
  • Look Up the device configuration
  • Initialize the device
  • Set the input parameters of the HLS block
  • Start the device and read the results

An example application is shown below.

#include "xexample.h"    // Device driver for HLS HW block
#include "xparameters.h" 

// HLS HW instance
XExample HlsExample;
XExample_Config *ExamplePtr

int main() {
 int res_hw;

// Look Up the device configuration 
 ExamplePtr = XExample_LookupConfig(XPAR_XEXAMPLE_0_DEVICE_ID);
 if (!ExamplePtr) {
 print("ERROR: Lookup of accelerator configuration failed.\n\r");
 return XST_FAILURE;
 }

// Initialize the Device
 status = XExample_CfgInitialize(&HlsExample, ExamplePtr);
 if (status != XST_SUCCESS) {
 print("ERROR: Could not initialize accelerator.\n\r");
 exit(-1);
 }

//Set the input parameters of the HLS block
 XExample_Set_a(&HlsExample, 42);
 XExample_Set_b(&HlsExample, 12);
 XExample_Set_c_i(&HlsExample, 1);

// Start the device and read the results
 XExample_Start(&HlsExample);
 do {
 res_hw = XExample_Get_c_o(&HlsExample);
 } while (XExample_Get_c_o(&HlsExample) == 0); // wait for valid data output
 print("Detected HLS peripheral complete. Result received.\n\r");
}