The ADP5589 is a 19 I/O port expander with built-in keypad matrix decoder, programmable logic, reset generator and PWM generator. This reference design allows full programming of the device, and also includes Keypad Decoder Test Mode and Key Lock/Unlock Feature.
System: Microblaze, AXI, UART
The bit file provided in the project *.zip file combines the FPGA bit file and the SDK elf files. It may be used for a quick check on the system. All you need is the hardware and a PC running a UART terminal and the programmer (IMPACT).
If you are not familiar with LX9 and/or Xilix tools, please visit
http://www.xilinx.com/products/boards-and-kits/AES-S6MB-LX9.htm for details.
If you are not familiar with Nexys™3 and/or Xilix tools, please visit
http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,400,897&Prod=NEXYS3 for details.
Extract the project from the archive file (ADP5589_<board_name>.zip) to the location you desire.
To begin, connect the PmodKYPD to J1 connector of PmodIOXP. After that, connect the PmodIOXP board to J4 connector of LX9 board, pins 3 to 6 (see image below). You must use the extension cable provided, otherwise the I2C Interface will not work. . Connect the USB cable from the PC to the USB-UART female connector of the board for the UART terminal. The board will be programmed through its USB male connector.
To begin, connect the PmodKYPD to J1 connector of PmodIOXP. After that, connect the PmodIOXP board to JA connector of Nexys™3 board, pins JA3 to JA6 (see image below). You must use the extension cable provided, otherwise the I2C Interface will not work. Connect the USB cables from the PC to the board, one for programming (Digilent USB device) and one for the UART terminal (FT232R USB UART).
Start IMPACT, and double click “Boundary Scan”. Right click and select Initialize Chain. The program should recognize the Spartan 6 device (see screenshot below). Start a UART terminal (set appropiate baud rate) and then program the device using the bit file provided in the project *.zip archive, located in the “sw” folder (../adp5589/sw/ADP5589.bit).
If programming was successful, you should be seeing messages appear on the terminal window as shown in figures below. After programming the ADP5589 device, the program will display initialization messages, and afterwards it will enter Key Decoder Test Mode. In this mode, you can press any key on the PmodKYPD, and it will be displayed on the UART along with the corresponding event (press/release). Pressing the [F] key will exit Key Decoder Test Mode. Next the program will Lock the keypad. Unlocking it requires the combination  [A].
The reference design is a simple I2C interface for the ADP5589. The software programs the device, monitors and reports events, locks or unlocks the keypad. It can also be programmed to generate a PWM signal or implement simple digital logic. The information is displayed on a UART terminal.
The hardware I2C access allows reading or writing of any ADP5589 registers via the address, write and read data registers.
PmodIOXP must be connected to J4 using the extension cable provided.
When decoding the PmodKYPD pay attention to the fact that:
UART must be set to 115200 Baud Rate for the Avnet LX-9 Microboard or 9600 Baud Rate for the Digilent Nexys™3 Board.