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Latest revision as of 10:46, 31 August 2018

Demonstration Files Location

The demo file is located in the batch folder: CDROM/Demonstrations/PCIe_Fundamental/demo_batch

The folder includes following files:

• FPGA Configuration File: PCIe_Fundamental.sof
• Download Batch file: test.sh
• Linux Application Software folder : linux_app, includes
  • PCIE_FUNDAMENTAL
  • terasic_pcie_qsys.so

Demonstration Setup

1. Install the FPGA board on your PC as shown in Figure1-1.

   

   Figure 1-1 FPGA board connect to PC

2. Open a terminal and use "cd" command to goto "CDROM/Demonstrations/PCIe_Fundamental/demo_batch".
3. Set QUARTUS_ROOTDIR variable pointing to the Quartus installation path. Set QUARTUS_ROOTDIR variable by tying the following commands in terminal. Replace /home/centos/intelFPGA/18.0/quartus to your quartus installation path.

   export QUARTUS_ROOTDIR=/home/centos/intelFPGA/18.0/quartus

4. Execute "sudo -E sh test.sh" command to configure the FPGA
5. Restart Linux
6. Install PCIe driver. The driver is located in the folder: CDROM/Demonstration/PCIe_SW_KIT/Linux/PCIe_Driver.
7. Type “ls –l /dev/altera_pcie*” to make sure the Linux has detected the FPGA Board. If the FPGA board is detected, developers can find the /dev/altera_pcieX(where X is 0~255) in Linux file system as shown below.

   .

8. Goto linux_app folder, execute PCIE_FUNDAMENTAL. A menu will appear as shown in Figure 1-2.

   

   Figure 1-2 Screenshot of Program Menu

9. Type 0 followed by a ENTER key to select Led Control item, then input 3 (hex 0x03) will make all led on as shown in Figure 1-3. If input 0 (hex 0x00), all led will be turn off.

   

   Figure 1-3 Screenshot of LED Control

10. Type 1 followed by an ENTER key to select Button Status Read item. The button status will be report as shown in Figure 1-4.

    

    Figure 1-4 Screenshot of Button Status Report

11. Type 2 followed by an ENTER key to select DMA Testing item. The DMA test result will be report as shown in Figure 1-5.

    

    Figure 1-5 Screenshot of DMA Memory Test Result

12. Type 99 followed by an ENTER key to exit this test program

Development Tools

• Quartus Prime 18.0 Standard Edition
• GNU Compiler Collection, Version 4.8 is recommend

Demonstration Source Code Location

• Quartus Project: Demonstrations/PCIe_Fundamental
• C++ Project: Demonstrations/PCIe_SW_KIT/Linux/PCIE_FUNDAMENTAL

FPGA Application Design

Figure 8-9 shows the system block diagram in the FPGA system. In the Qsys, Altera PIO controller is used to control the LED and monitor the Button Status, and the On-Chip memory is used for performing DMA testing. The PIO controllers and the On-Chip memory are connected to the PCI Express Hard IP controller through the Memory-Mapped Interface.

Figure 8-9 Hardware block diagram of the PCIe reference design

Linux Based Application Software Design

The application software project is built by GNU Toolchain. The project includes the following major files:</div>

NAME	Description
PCIE_FUNDAMENTAL.cpp	Main program
PCIE.c	Implement dynamically load for TERAISC_PCIE_AVMM.DLL
PCIE.h
TERASIC_PCIE_AVMM.h	SDK library file, defines constant and data structure

The base address of BUTTON and LED controllers are 0x4000010 and 0x4000020 based on PCIE_BAR4, in respectively. The on-chip memory base address is 0x00000000 relative to the DMA controller.

Before accessing the FPGA through PCI Express, the application first calls PCIE_Load to dynamically load the terasic_pcie_qsys.so. Then, it call PCIE_Open to open the PCI Express driver. The constant DEFAULT_PCIE_VID and DEFAULT_PCIE_DID used in PCIE_Open are defined in TERASIC_PCIE_AVMM.h. If developer change the Vendor ID and Device ID and PCI Express IP, they also need to change the ID value define in TERASIC_PCIE_AVMM.h. If the return value of PCIE_Open is zero, it means the driver cannot be accessed successfully. In this case, please make sure:

• The FPGA is configured with the associated bit-stream file and the host is rebooted.
• The PCI express driver is loaded successfully.

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