I am trying to write a simple custom IP to get started. I just want
to control the LED on my evaluation board. I want to be able to write
a custom IP to prove to myself I am doing it correctly instead of
using the IP provided.
I am using a Memec V4 UltraController II eval board and EDK 9.1 SP2.
I created a template IP using EDK and then wrote my VHDL code to
control the LEDs. The problem is I have no control over the LEDs.
In my led.vhd file I added to my entity and architecture:
--USER ports added here
pLED1 : out std_logic;
pLED2 : out std_logic;
pLED3 : out std_logic;
Then in user logic I added some internal signals to my architecture:
signal iLED1 : std_logic := '1';
signal iLED2 : std_logic := '0';
signal iLED3 : std_logic := '0';
And finally I added some assignments at the end of the architecture:
pLED1 <= iLED1;
pLED2 <= iLED2;
pLED3 <= slv_reg0(2);
slv_reg0 is a register that can be written to and read over the OPB.
The slv_reg0 can be read and written through XMD, but the LEDs do not
change. Also using the default signal values, LED1 & LED2 should have
different states, but all 3 LEDs have the same state.
For completion I added:
Net fpga_0_LED1_pin LOC = D13 | IOSTANDARD = LVCMOS25;
Net fpga_0_LED2_pin LOC = D12 | IOSTANDARD = LVCMOS25;
Net fpga_0_LED3_pin LOC = D11 | IOSTANDARD = LVCMOS25;
to the system.ucf file. And I added:
PORT fpga_0_LED1_pin = fpga_0_LED1, DIR = O
PORT fpga_0_LED2_pin = fpga_0_LED2, DIR = O
PORT fpga_0_LED3_pin = fpga_0_LED3, DIR = O
PARAMETER INSTANCE = opb_leds_0
PARAMETER HW_VER = 1.00.a
PARAMETER C_BASEADDR = 0x73c00000
PARAMETER C_HIGHADDR = 0x73c0ffff
BUS_INTERFACE SOPB = opb
PORT pLED1 = fpga_0_LED1
PORT pLED2 = fpga_0_LED2
PORT pLED3 = fpga_0_LED3
to the system.mhs file.
Does any see why the LEDs do not change state?