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Found 4 results

  1. Junior_jessy


    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 and click "user guide", it will bring you to 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 <> -- -- 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
  4. I've finally got my PmodMIC3 out of it's back and have it up and running. It's pretty interesting how the MEMS microphones work - it seems to be much like this, but at audio frequencies: