使用VisualStudio讀寫NI FPGA板卡實例(基於FPGA Interface C API Generator）

時間 2019-11-12

標籤使用 visualstudio 讀寫 fpga 實例基於 interface api generator 欄目 Visual Studio 简体版

原文原文鏈接

實驗平臺說明：安裝了NI LabVIEW 2015 32bit版本，安裝了NI FPGA Interface C API Generator，安裝了硬件PCIe-7842R；安裝了Visual Studio 2015(下載的C API Generator說明是針對VS2013，不過實驗測試發現vs2015能夠使用)；按照官網給的例子進行實驗http://www.ni.com/tutorial/8638/en/，只測試了FPGA板卡模擬輸入功能，沒有寫模擬輸出功能。官網例子是採用NI公司的LabWindows/CVI上位機軟件。session

實驗步驟：app

在LabVIEW中新建FPGA工程，命名爲FPGA.vi

此工程中，FPGA和上位機有四個接口：3個參數輸入接口（Samples等等），1個數據讀取接口（FIFO），接口通訊經過PCIe進行。編譯該工程，獲得bitfile文件函數

　　2.打開FPGA Interface C API Generator，導入以前用LabVIEW編譯生成的FPGA bitfile，點擊generate，生成了幾個個文件：1.FPGA bitfile; 2.NiFpga.c;3.NiFpga.h;4.NiFpga_FPGA.h；oop

其中NiFpga_FPGA.h包含了應用程序中函數調用須要的常量，和上述讀寫結構的地址信息測試

NiFpga.c和NiFpga.h對全部工程都是同樣的，包含了調用NI FPGA的各類系統函數。ui

3.新建visual studio控制檯應用程序，添加上述幾個文件spa

　　4.NiFpga.c設置編譯屬性，選擇No Precompile,以下。（若是不這樣設置，編譯的時候會因C/C++編譯問題而報錯）code

5.編譯上位機程序，主要是打開FPGA(完成下載bitfile到FPGA的任務)，按照地址讀寫FPGA中的接口，關閉FPGA等操做。測試程序以下：blog

 1 // ConsoleApplication1.cpp : Defines the entry point for the console application.
 2 //
 3 // NIFPGATest.cpp : Defines the entry point for the console application.
 4 //
 5 #include "stdafx.h"
 6 #include "NiFpga_FPGA.h"
 7 #include <malloc.h>
 8 
 9 int main()
10 {
11     /* must be called before any other calls */
12     printf("Initializing...\n");
13     NiFpga_Status status = NiFpga_Initialize();
14     if (NiFpga_IsNotError(status))
15     {
16         NiFpga_Session session;
17         /* opens a session, downloads the bitstream, and runs the FPGA */
18         printf("Opening a session...\n");
19         /* opens a session, downloads the bitstream, but does not run the FPGA */
20         NiFpga_MergeStatus(&status, NiFpga_Open(NiFpga_FPGA_Bitfile, NiFpga_FPGA_Signature,
21             "RIO0", NiFpga_OpenAttribute_NoRun, &session));
22         if (NiFpga_IsNotError(status))
23         {
24             /* declare variables for output and input */
25             double numSamples, aorate, airate;
26             uint16_t threshold = 0;
27             uint32_t r, timeout = 10000/* 10 seconds */;
28             NiFpga_Bool overLimit;
29             int16_t *data = NULL;
30             numSamples = 10;
31             airate = 1000;
32             /* allocate size for the samples to read */
33             data = (int16_t*)malloc(sizeof(int16_t) * numSamples);
34 
35             /* write the number of samples and loop rate to the FPGA VI */
36             NiFpga_MergeStatus(&status, NiFpga_WriteI32(session, NiFpga_FPGA_ControlI32_Samples, numSamples));
37             NiFpga_MergeStatus(&status, NiFpga_WriteU32(session, NiFpga_FPGA_ControlU32_LoopPeriod, airate));
38             NiFpga_MergeStatus(&status, NiFpga_WriteI16(session, NiFpga_FPGA_ControlI16_Threshold, threshold));
39 
40             /* run the FPGA application */
41             printf("Running the FPGA...\n");
42             NiFpga_MergeStatus(&status, NiFpga_Run(session, 0));
43 
44             /* read the DMA FIFO */
45             NiFpga_MergeStatus(&status, NiFpga_ReadFifoI16(session, NiFpga_FPGA_TargetToHostFifoI16_FIFO,
46                 data, numSamples, timeout, &r));
47 
48             /* read the Over Limit? boolean */
49             NiFpga_MergeStatus(&status, NiFpga_ReadBool(session, NiFpga_FPGA_IndicatorBool_OverLimit,
50                 &overLimit));
51 
52             /* close the session now that we're done */
53             printf("Closing the session...\n");
54             NiFpga_MergeStatus(&status, NiFpga_Close(session, 0));
55         }
56         /* must be called after all other calls */
57         printf("Finalizing...\n");
58         NiFpga_MergeStatus(&status, NiFpga_Finalize());
59     }
60     /* check if anything went wrong */
61     if (NiFpga_IsError(status))
62     {
63         printf("Error %d!\n", status);
64         printf("Press <Enter> to quit...\n");
65         getchar();
66     }
67 
68     return status;
69 }