Re: FPGA Single LED Demos: FPGA board for a good ideas/suggestions

"Jim Granville" <no.spam@xxxxxxxxxxxxxxxxx> schrieb im Newsbeitrag
news:44548f48@xxxxxxxxxxxxxxx
Antti Lukats wrote:

Hi all

I am looking for ideas for: "FPGA Single LED Demos", The requirements for
the demo Application are following:

* Display visible 'sign of live' or 'self-test passed' message
* Impemented in FPGA Vendor neutral HDL
* <= 3000 LUT
* <= 4KB of Block RAM
* uncalibrated (+-50%) high frequency oscillator
* 1 user LED for display

The Demo application should have some sort of LED visible 'message' to
indicate the demo is working or has passed internal self test code. There
is no user interface byeound one single LED.
Most obvious is to extend to a BiColour LED, Driven from 2 pins, so
that you can generate : Pure RED, Modulated RED (OE), Pure GREEN,
Modulated GREEN (OE) and Colour Modulated (PWM %R/100-% G)
Control lines are : R, R.oe, G, G.oe

dual color SMD led costs 10 times as much as single color and the layout
isnt so standard and I have some pre-series PCBs with only one LED
already. Sure dual color LED would have more possibilities for visual
effects

Then at eye-ball rates, you can signal something over 4 states, without
needing long dividers.

[Well, yes, this is only partially vendor neutral: it works on all those
vendors who actually gave this some thought, and installed a BiColour
LED ]

My preferred modulation is PDM (Rate Multiplier), rather than PWM : PDM
uses the least resource in CPLDs, and filters better in DAC applications.

could you elaborate on this? I had delta-sigma DAC already on my list
that is pulse density modulation - but you are referring to something else?

Also not on your list, is a RC5 / manchester Encoded LED modulate.
Target the std IR-Remote Receivers, perhaps with an IR led in Parallel
if the RED energy is too low to activate a NearBy - StdIR RX unit.

That allows actual BIT serial (status flags) info to be sent, into a
simple receiver.

One-Wire encoding is another way to send Freq tolerant information,
in an easily decoded manner.


Actually one-wire comm requires known frequency reference better than
I can count for, also in my requirements was no other interface (than LED)

Best ideas can be rewarded with an FPGA evaluation board (with your idea
pre-programmed). Suggestions a-la "soft-core cpu acme/xyz" will not
count.

-jg

I was possible giving not enough information at first place - the module in
question
has actually 3 interfaces with 6+6+4 (shared with JTAG pins in parallel)
I/O's
one of them can be used for block transfers to host with up to 6MByte/S

However any communication with host would require some software on the
host what may not exist for the host platform, so I was looking for demos
that can be 'tested' for simple 'it blinks, ít works' in the case we assume
there host communication is unavailable - similarly any demos requirying
additional hardware ae beyound the scope, dual color, tri-color led
buzzer, IR tranceiver are all things that could be used, - with extra
add-on modules.

I was more looking for more ideas to demonstrate things that an
FPGA can do, it could be some algorithm that is processed once
or in a look and if the self check result is ok then blink a led.

Just to have people a way to 'seeing is beliving' want to test
this or that, download this, when LED blinks then it is signal
that this or that works - in real hardware.

Antti


























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