DAC spartan3e

[lwew96]

I drive SPI to create sine wave. But i think i haven't done. 

Anyone help me?

[hamster]

I might be able to. Tell me everything you can about your project that might be helpful to me so I can help you. 

You at lease have a periodic pattern of the scope, so that is something. However the voltages seem really high. Do you have the probe set to 1x and the scope set to 10x?

[hamster]

Actually, looking at that screen, are you sure it isn't just 50Hz hum? It looks to repeat every 20ms.

[lwew96]

I think no signal in fpga

[lwew96]

@hamster

I have posted my code. Can you repair my code to help me.

Thank you so much

dds.vhd sparnta3e.vhd sadasda.ucf

[hamster]

Have you done any debugging yourself? If so, what have you tried?

I am not familiar with the FPGA board you are using... is it a Digilent one? Do you have any documentation for iit?

Do you know what the part code is for the DAC? 

Are you sure you are using the correct pin locations?

What would the correct signal look like (e.g. it is a sine wave at 1234Hz, with 2V peak-to-peak)?

Are you sure you included the correct right code? The header says:

-- Copyright (c) 2007 Frank Buss (fb@frank-buss.de)
-- See license.txt for license

If it is the right code, have you tried to get hold of Frank Buss?