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Altera_Forum
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13 years ago

A/D converter-FPGA-USB

Hello, can anybody provide some basic idea to get digital data from A/D converter(HSMC) into cyclone IVE fpga and pass it into computer via USB port. Thanks in advance
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hi, As output from 14 bit ADC is in 2's complement form having 1 volt reference voltage. and I am trying to convert it into Sign Magnitude in following way:

process (CLOCK_50)

begin

if rising_edge(CLOCK_50) then

if (ADC_DA(13)='1') then --for -ve value

calculation<=ADC_DA-1;

calculation<=NOT(calculation);

calculation(13)<= '1';

LEDR <= calculation;

else

LEDR<=ADC_DA; --for +ve value

end if;

end if;

end process;

but not getting desired output in signal tap anyser for LEDR here.

Am I missing something??