📄 iicrd.vhd
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library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity iicrd is
port( reset_1: in std_logic;
clkmain1: in std_logic;
xiicask_1: in std_logic;
xiichange_1: in std_logic;
xiicdatain_3: in std_logic_vector(7 downto 0);
iicend_p1_321d: out std_logic;
iicdataout_p1_322u: buffer std_logic_vector(7 downto 0);
scl_p1_322u: out std_logic;
sda_z2_322u: inout std_logic);
end iicrd;
architecture behav of iicrd is
signal iicask_s1_321d: std_logic;
signal iicwork_s1_322u: std_logic;
signal temp_s0_321d: std_logic_vector(2 downto 0);
signal temp_s0_322u: std_logic_vector(4 downto 0);
signal iicdata_s3_322d: std_logic_vector(7 downto 0);
signal iiclength_s3_321d: std_logic_vector(7 downto 0);
signal iiclecoun_s3_321d: std_logic_vector(7 downto 0);
signal counter_s0_322u: std_logic_vector(2 downto 0);
-------------------------------------------------------------------------------
begin
proc321:process(clkmain1,reset_1)
begin
if(reset_1='0')then
iicask_s1_321d<='1';
iicend_p1_321d<='1';
temp_s0_321d<="000";
elsif(clkmain1'event and clkmain1='0')then
if(temp_s0_321d="000")then -----------length------------
if(xiicask_1='0')then
if(iicwork_s1_322u='1' and xiichange_1='0')then
iiclength_s3_321d<=xiicdatain_3;
iiclecoun_s3_321d<="00000000";
iicask_s1_321d<='0';
temp_s0_321d<="001";
else
iicend_p1_321d<='1';
iicask_s1_321d<='1';
temp_s0_321d<="000";
end if;
else
iicask_s1_321d<='1';
iicend_p1_321d<='1';
temp_s0_321d<="000";
end if;
elsif(temp_s0_321d="001")then
if(iicwork_s1_322u='0')then
iicask_s1_321d<='1';
iicend_p1_321d<='0';
temp_s0_321d<="010";
else
temp_s0_321d<="001";
end if;
elsif(temp_s0_321d="010")then
if(iicwork_s1_322u='1')then
iicend_p1_321d<='1';
temp_s0_321d<="011";
else
temp_s0_321d<="010";
end if;
elsif(temp_s0_321d="011")then --------------id-addr-data-------
if(xiicask_1='0')then
if(iicwork_s1_322u='1' and xiichange_1='0')then
iiclecoun_s3_321d<=iiclecoun_s3_321d+'1';
iicask_s1_321d<='0';
temp_s0_321d<="100";
else
temp_s0_321d<="011";
end if;
else
iicask_s1_321d<='1';
iicend_p1_321d<='1';
temp_s0_321d<="110";
end if;
elsif(temp_s0_321d="100")then
if(iicwork_s1_322u='0')then
iicask_s1_321d<='1';
iicend_p1_321d<='0';
temp_s0_321d<="101";
else
temp_s0_321d<="100";
end if;
elsif(temp_s0_321d="101")then
if(iicwork_s1_322u='1')then
iicend_p1_321d<='1';
if(iiclecoun_s3_321d>=iiclength_s3_321d)then
temp_s0_321d<="110";
else
temp_s0_321d<="011";
end if;
else
temp_s0_321d<="101";
end if;
elsif(temp_s0_321d="110")then -------------end----------------
if(iicwork_s1_322u='1')then
iicask_s1_321d<='0';
temp_s0_321d<="111";
else
temp_s0_321d<="110";
end if;
elsif(temp_s0_321d="111")then
if(iicwork_s1_322u='0')then
iicask_s1_321d<='1';
temp_s0_321d<="000";
else
temp_s0_321d<="111";
end if;
end if;
end if;
end process proc321;
proc322:process(clkmain1,reset_1)
begin
if(reset_1='0')then
temp_s0_322u<="00000";
counter_s0_322u<="000";
iicwork_s1_322u<='1';
scl_p1_322u<='1';
sda_z2_322u<='1';
elsif(clkmain1'event and clkmain1='1')then
if(temp_s0_322u="00000")then
if(iicask_s1_321d='0')then
if(temp_s0_321d<"011")then ------------------start
sda_z2_322u<='1';
scl_p1_322u<='1';
iicwork_s1_322u<='0';
temp_s0_322u<="00001";
elsif(temp_s0_321d>="011" and temp_s0_321d<"110")then --------------ID(wr)
iicdata_s3_322d<=xiicdatain_3;
counter_s0_322u<="000";
iicwork_s1_322u<='0';
if(iiclecoun_s3_321d="00000001")then
temp_s0_322u<="01000"; ---goto wr
elsif(iiclecoun_s3_321d="00000010")then
temp_s0_322u<="01000"; ---goto wr
elsif(iiclecoun_s3_321d>="00000011")then
temp_s0_322u<="10000"; ---goto rd
sda_z2_322u<='Z';
end if;
elsif(temp_s0_321d>="110")then -------------------end
iicwork_s1_322u<='0';
sda_z2_322u<='0';
temp_s0_322u<="11000";
end if;
else
iicwork_s1_322u<='1';
temp_s0_322u<="00000";
end if;
elsif(temp_s0_322u>="00001" and temp_s0_322u<"01000")then -----------------------start-------
if(temp_s0_322u="00001")then
sda_z2_322u<='1';
scl_p1_322u<='1';
temp_s0_322u<="00010";
elsif(temp_s0_322u="00010")then
sda_z2_322u<='0';
temp_s0_322u<="00011";
elsif(temp_s0_322u="00011")then
scl_p1_322u<='0';
sda_z2_322u<='0';
temp_s0_322u<="00100";
elsif(temp_s0_322u>="00100")then
scl_p1_322u<='0';
sda_z2_322u<='1';
iicwork_s1_322u<='1';
temp_s0_322u<="00000";
end if;
elsif(temp_s0_322u>="01000" and temp_s0_322u<"10000")then ----------------------wr data---------
if(temp_s0_322u="01000")then
sda_z2_322u<=iicdata_s3_322d(7);
temp_s0_322u<="01001";
elsif(temp_s0_322u="01001")then
iicdata_s3_322d(7)<=iicdata_s3_322d(6);
iicdata_s3_322d(6)<=iicdata_s3_322d(5);
iicdata_s3_322d(5)<=iicdata_s3_322d(4);
iicdata_s3_322d(4)<=iicdata_s3_322d(3);
iicdata_s3_322d(3)<=iicdata_s3_322d(2);
iicdata_s3_322d(2)<=iicdata_s3_322d(1);
iicdata_s3_322d(1)<=iicdata_s3_322d(0);
scl_p1_322u<='1';
temp_s0_322u<="01010";
elsif(temp_s0_322u="01010")then
scl_p1_322u<='0';
if(counter_s0_322u>="111")then
temp_s0_322u<="01011";
else
counter_s0_322u<=counter_s0_322u+'1';
temp_s0_322u<="01000";
end if;
elsif(temp_s0_322u="01011")then ---------wait ack
iicwork_s1_322u<='1';
sda_z2_322u<='Z';
temp_s0_322u<="01100";
elsif(temp_s0_322u="01100")then
scl_p1_322u<='1';
sda_z2_322u<='Z';
temp_s0_322u<="01101";
elsif(temp_s0_322u="01101")then
scl_p1_322u<='0';
sda_z2_322u<='1';
temp_s0_322u<="00000";
end if;
elsif(temp_s0_322u>="10000" and temp_s0_322u<"11000")then ------------------------rd data-------
if(temp_s0_322u="10000")then
iicdataout_p1_322u(7)<=iicdataout_p1_322u(6);
iicdataout_p1_322u(6)<=iicdataout_p1_322u(5);
iicdataout_p1_322u(5)<=iicdataout_p1_322u(4);
iicdataout_p1_322u(4)<=iicdataout_p1_322u(3);
iicdataout_p1_322u(3)<=iicdataout_p1_322u(2);
iicdataout_p1_322u(2)<=iicdataout_p1_322u(1);
iicdataout_p1_322u(1)<=iicdataout_p1_322u(0);
iicdataout_p1_322u(0)<=sda_z2_322u;
scl_p1_322u<='1';
sda_z2_322u<='Z';
temp_s0_322u<="10001";
elsif(temp_s0_322u="10001")then
sda_z2_322u<='Z';
scl_p1_322u<='0';
if(counter_s0_322u>="111")then
temp_s0_322u<="10010";
else
counter_s0_322u<=counter_s0_322u+'1';
temp_s0_322u<="10000";
end if;
elsif(temp_s0_322u="10010")then
iicwork_s1_322u<='1';
temp_s0_322u<="10011";
if(iiclecoun_s3_321d>=iiclength_s3_321d)then ----------no ack
sda_z2_322u<='1';
else
sda_z2_322u<='0'; ----------ack
end if;
elsif(temp_s0_322u="10011")then
scl_p1_322u<='1';
temp_s0_322u<="10100";
elsif(temp_s0_322u>="10100")then
scl_p1_322u<='0';
temp_s0_322u<="00000";
end if;
elsif(temp_s0_322u>="11000")then -------------------------stop-----------
if(temp_s0_322u="11000")then
scl_p1_322u<='1';
temp_s0_322u<="11001";
elsif(temp_s0_322u="11001")then
sda_z2_322u<='1';
temp_s0_322u<="11010";
elsif(temp_s0_322u>="11010")then
iicwork_s1_322u<='1';
scl_p1_322u<='1';
sda_z2_322u<='1';
temp_s0_322u<="00000";
end if;
end if;
end if;
end process proc322;
end behav;⌨️ 快捷键说明
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