hackrf/firmware/cpld/sgpio_if

CPLD interface between LPC43xx microcontroller SGPIO peripheral and MAX5864 RF codec.

CPLD-based triggered capture

Code related to the paper:

M. Bartolucci, J. A. del Peral-Rosado, R. Estatuet-Castillo, J. A. Garcia-Molina, M. Crisci, G. E. Corazza, "Synchronisation of low-cost open source SDRs for navigation applications", Proc. 8th ESA Workshop on Satellite Navigation User Equipment Technologies (NAVITEC), Dec 16 2016

Please read the paper for hardware correction and additional details.

• If you don't want to build use code]default_sync.xsvf to flash the CPLD
• This is still a very rough implementation. Synchronization can't be disabled!

Requirements

To build this VHDL project and produce an SVF file for flashing the CPLD:

• Xilinx WebPACK 13.4 for Windows or Linux.

To program the SVF file into the CPLD:

• Dangerous Prototypes Bus Blaster v2:

  • Configured with JTAGKey buffers.
  • Connected to CPLD JTAG signals on Jellybean.

• urJTAG built with libftdi support.

• BSDL model files for Xilinx CoolRunner-II XC264A, available at xilinx.com, in the "Device Models" Support Resources section of the CoolRunner-II Product Support & Documentation page. Only one file from the BSDL package is required, and the "program" script below expects it to be at the relative path "bsdl/xc2c/xc2c64.bsd".

Generate an XSVF

After generating a programming file:

• In the ISE Project Navigator, "Processes: top - Behavioral" pane, double-click "Configure Target Device".
• Click "OK" to open iMPACT.
• Ctrl-N to create a "New Project".
• "Yes" to automatically create and save a project file.
• Select "Prepare a Boundary-Scan File", choose "XSVF".
• Select file name "default.xsvf".
• Click "OK" to start adding devices.
• Assign new configuration file: "top.jed".
• Right-click the "xc2c64a top.jed" icon and select "Erase". Accept defaults.
• Right-click the "xc2c64a top.jed" icon and select "Program".
• Right-click the "xc2c64a top.jed" icon and select "Verify".
• Choose menu "Output" -> "XSVF File" -> "Stop Writing to XSVF File".
• Close iMPACT.

To Program

./program

...which connects to the Bus Blaster interface 0, sets the BSDL directory, detects devices on the JTAG chain, and writes the sgpio_if.svf file to the CPLD.