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Found 4 results

  1. Junior_jessy

    Voice-activited

    Hello, I'm trying to make a voice-activated on a nesys4 and i want to use the pmodMic3.To do si, I want to use the SPI protocol but i don't know how. So how can i choose the SPI protocol ? Furthermore, I got some issues when filling in the constraint's file. On the web-site of Diligent, the pin2 is not connected but, the protocol SPI show the opposite. So how to Well connect the in/out of the peripheral to the board in the constraint's file? Thank you in advance for your answer. Junior
  2. We are trying to investigate whether the PmodMIC3 would be a suitable microphone to use for a project, but we cannot find details on how the 12-bits of digital data sent should be interepreted. There is a link on your website to a "user guide" but that link is broken. Go to https://reference.digilentinc.com/pmod/pmod/mic3/ref_manual and click "user guide", it will bring you to https://reference.digilentinc.com/pmod/pmod/mic3/user_guide where it says "This topic does not exist yet". Is it possible to repair this link so we can obtain this user guide? Thank you very much.
  3. I got a bit bored yesterday, and hooked the PMODmic3 up to my PMODamp3 design, and put a small delay (of 32768 samples). The VHDL module for the microphone interface is actually surprisingly small : ---------------------------------------------------------------------------------- -- Engineer: Mike Field <hamster@snap.net.nz> -- -- Module Name: pmod_mic3 - Behavioral -- -- Description: Sample input form a PMOD_MIC3, once every 256 ticks of the -- master clock (mclk). ---------------------------------------------------------------------------------- library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.NUMERIC_STD.ALL; entity pmod_mic3 is Port ( mclk : in STD_LOGIC; sclk : out STD_LOGIC; cs : out STD_LOGIC; sdat : in STD_LOGIC; de : out STD_LOGIC; sample : out STD_LOGIC_VECTOR (15 downto 0) := (others => '0')); end pmod_mic3; architecture Behavioral of pmod_mic3 is signal counter : unsigned(7 downto 0) := (others => '0'); signal data_sr : std_logic_vector(11 downto 0) := (others => '0'); begin process(mclk) begin if rising_edge(mclk) then de <= '0'; if counter > 5 and counter < 6 + 16*8 then cs <= '0'; else cs <= '1'; end if; if counter(2 downto 0) = 0 then data_sr <= data_sr(10 downto 0) & sdat; end if; if counter = 17 * 8 then --------------------------------------------- -- convert the 12-bit unsigned sample to the -- lowest 12 bits of a 16-bit signed sample -- by adding it to -2048 --------------------------------------------- de <= '1'; sample <= std_logic_vector(to_unsigned(63488,16) + unsigned(data_sr)); end if; sclk <= std_logic(counter(2)); counter <= counter + 1; end if; end process; end Behavioral; If interested, the rest of the code is at http://hamsterworks.co.nz/mediawiki/index.php/MIC_and_AMP
  4. I've finally got my PmodMIC3 out of it's back and have it up and running. http://hamsterworks.co.nz/mediawiki/index.php/Digital_Microphone It's pretty interesting how the MEMS microphones work - it seems to be much like this, but at audio frequencies: