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authorFlenk008 <frenk_0_0@hotmail.com>2023-03-09 20:43:56 +0100
committerGitHub <noreply@github.com>2023-03-09 20:43:56 +0100
commiteb3a6a29ff9ed83a661588bd584e2fb9c9fada92 (patch)
tree0b2a9a31034d7778812aea2c5e991f4c5c34a719 /GameLogic/vhdl/spiSlave.vhd
parent2983fd4fba208b3039be753c80d17804eb4a123e (diff)
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+----------------------------------------------------------------------------------
+-- Company:
+-- Engineer:
+--
+-- Create Date: 15.02.2023 21:09:16
+-- Design Name:
+-- Module Name: top - Behavioral
+-- Project Name:
+-- Target Devices:
+-- Tool Versions:
+-- Description:
+--
+-- Dependencies:
+--
+-- Revision:
+-- Revision 0.01 - File Created
+-- Additional Comments:
+--
+----------------------------------------------------------------------------------
+
+
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+
+-- Uncomment the following library declaration if using
+-- arithmetic functions with Signed or Unsigned values
+use IEEE.NUMERIC_STD.ALL;
+use IEEE.STD_LOGIC_UNSIGNED.ALL;
+-- Uncomment the following library declaration if instantiating
+-- any Xilinx leaf cells in this code.
+--library UNISIM;
+--use UNISIM.VComponents.all;
+
+entity spiSlave is
+ Port ( clkBoard : in std_logic; -- clock basys3 100MHz
+ clkSPI : in std_logic; -- incoming clock of SPI
+ dataSPI : in std_logic; -- incoming data of SPI
+ csSPI : in std_logic; -- incoming select of SPI
+ dataRead : out std_logic_vector(23 downto 0) := (others => '0') -- data read
+
+ );
+end spiSlave;
+
+architecture Behavioral of spiSlave is
+ signal PulseFF0,PulseFF1,PulseFF2,PulseFF3 : std_logic := '0'; -- signal for metastability synchronizer of clk SPI
+ signal dataFF0,dataFF1,dataFF2,dataFF3 : std_logic := '0'; -- signal for metastability synchronizer of data SPI
+ signal ssFF0,ssFF1,ssFF2,ssFF3 : std_logic := '0'; -- signal for metastability synchronizer of slave select SPI
+
+ signal data : std_logic_vector(23 downto 0) := (others => '0'); -- signal to store incomming data of dataSPI (2x 8bit)
+ signal counter : integer := 23; --counter for data position
+ signal enable : std_logic := '0'; -- enable signal if slave is selected
+begin
+
+ process (clkBoard)
+ begin
+
+ if rising_edge(clkBoard) then
+ -- flip flop for clk SPI to synchronise a
+ PulseFF0 <= clkSPI;
+ PulseFF1 <= PulseFF0;
+ PulseFF2 <= PulseFF1;
+ PulseFF3 <= PulseFF2;
+ -- flip flop for data SPI to synchronise
+ dataFF0 <= dataSPI;
+ dataFF1 <= dataFF0;
+ dataFF2 <= dataFF1;
+ dataFF3 <= dataFF2;
+ -- flip flop for slave select SPI to synchronise
+ ssFF0 <= csSPI;
+ ssFF1 <= ssFF0;
+ ssFF2 <= ssFF1;
+ ssFF3 <= ssFF2;
+ -- check if slave select signal has falling edge (slave is selected by master)
+ if(ssFF3 = '1' and ssFF2 = '0') then
+ --reset counter if true
+ counter <= 23;
+ --disable data read if rising edge (slave is not selected)
+ elsif (ssFF3 = '0' and ssFF2 = '1') then
+ enable <= '0';
+ end if;
+ --check if synchronised slave select signal is falling edge or data read is enabled
+ if(ssFF3 = '1' and ssFF2 = '0') or enable = '1' then
+ enable <= '1'; --enable data read
+ if (PulseFF3 = '0' and PulseFF2 = '1') then -- check for rising edge of clk SPI
+ if counter > -1 then
+ counter <= counter - 1;
+ -- data transfer into vector
+ data(counter) <= dataFF3;
+ end if;
+ end if;
+ --check if counter is done
+ if counter = -1 then
+ counter <= 23; --reset counter
+ dataRead <= data;
+ end if;
+ elsif (enable = '0') then
+ --dataRead <= data;
+
+ end if;
+
+ end if;
+
+ end process;
+
+end Behavioral;