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Implemented triangle, saw-tooth and square wave in dds.vhd.

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This commit is contained in:
T-moe
2016-05-16 20:38:11 +02:00
parent c423df7bf9
commit 22ebbdf9b9
3 changed files with 59 additions and 41 deletions
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46
dds.vhd
View File

@@ -31,33 +31,47 @@ entity dds is
Generic (clk_freq: natural:= 50000000;
max_freq: natural := 100000;
adc_res: natural:=12;
vector_res: natural :=8 );
acc_res: natural:=32;
phase_res: natural:=15);
Port ( clk : in STD_LOGIC;
freq : in unsigned (log2_int(max_freq)-1 downto 0);
form : in unsigned (1 downto 0);
amp : out unsigned (adc_res-1 downto 0);
amp : out signed (adc_res-1 downto 0);
update : out STD_LOGIC);
end dds;
architecture Behavioral of dds is
constant clk2 : natural := clk_freq/(2**vector_res);
constant clk2_us :unsigned (log2_int(clk2)-1 downto 0) :=to_unsigned(clk2,log2_int(clk2));
signal prescale,cnt_prescale :unsigned (log2_int(clk2)-1 downto 0) := (others => '0');
signal m, idx : unsigned(vector_res -1 downto 0):= (others => '0');
architecture Behavioral of dds is
signal m, idx : unsigned(acc_res -1 downto 0):= (others => '0');
signal idx_phase : unsigned(phase_res-1 downto 0) := (others => '0');
signal amp_rect, amp_saw, amp_tria, amp_sin : signed (adc_res-1 downto 0);
begin
prescale <= divide(to_unsigned(clk2,prescale'length),freq);
m <= resize(divide(freq*prescale,to_unsigned(clk2,prescale'length)),m'length);
-- m = f0*2^n/fc
m <= resize(divide(shift_left(resize(freq,64),acc_res),to_unsigned(clk_freq,64)),m'length);
idx_phase <= idx(acc_res -1 downto acc_res - phase_res);
amp_rect <= to_signed((2**(adc_res-1)) - 1,adc_res) when idx_phase(phase_res-1)='0' else
to_signed(-(2**(adc_res-1)),adc_res);
amp_saw <= to_signed(-(2**(adc_res-1)),adc_res)
+ signed(resize(unsigned(((2**adc_res) -1)*idx_phase/2**phase_res),adc_res)) ;
amp_tria <= to_signed(-(2**(adc_res-1)),adc_res)
+ signed(resize(unsigned(((2**adc_res) -1)*idx_phase/2**(phase_res-1)),adc_res))
when idx_phase(phase_res-1)='0' else
resize(to_signed((2**(adc_res))-1,adc_res+1)
- signed(resize(unsigned(((2**adc_res) -1)*idx_phase/2**(phase_res-1)),adc_res)),adc_res);
amp <= amp_tria;
P1: process(clk)
begin
if(rising_edge(clk)) then
if(cnt_prescale >= prescale) then
cnt_prescale <= to_unsigned(1, prescale'length);
idx <= (idx+m) mod (2**vector_res);
else
cnt_prescale <= cnt_prescale +1;
end if;
idx <= (idx+m);
end if;
end process P1;

40
dds_tb.vhd
View File

@@ -41,7 +41,7 @@ ARCHITECTURE behavior OF dds_tb IS
clk : IN std_logic;
freq : IN unsigned(16 downto 0);
form : IN unsigned(1 downto 0);
amp : OUT unsigned(11 downto 0);
amp : OUT signed(11 downto 0);
update : OUT std_logic
);
END COMPONENT;
@@ -53,11 +53,11 @@ ARCHITECTURE behavior OF dds_tb IS
signal form : unsigned(1 downto 0) := (others => '0');
--Outputs
signal amp : unsigned(11 downto 0);
signal amp : signed(11 downto 0);
signal update : std_logic;
-- Clock period definitions
constant clk_period : time := 10 ns;
constant clk_period : time := 20 ns; --50mhz
BEGIN
@@ -86,21 +86,27 @@ BEGIN
-- hold reset state for 100 ns.
wait for 100 ns;
wait for clk_period*10;
freq <= to_unsigned(1,17);
wait for clk_period*10;
freq <= to_unsigned(10,17);
wait for clk_period*10;
freq <= to_unsigned(100,17);
wait for clk_period*10;
freq <= to_unsigned(1000,17);
wait for clk_period*10;
freq <= to_unsigned(10000,17);
wait for clk_period*10;
freq <= to_unsigned(50000,17);
wait for clk_period*10;
freq <= to_unsigned(100000,17);
wait for 2000 ms;
freq <= to_unsigned(10,17);
wait for 200 ms;
freq <= to_unsigned(100,17);
wait for 20 ms;
freq <= to_unsigned(1000,17);
wait for 2 ms;
freq <= to_unsigned(10000,17);
wait for 1 ms;
freq <= to_unsigned(50000,17);
wait for 1 ms;
freq <= to_unsigned(100000,17);
wait for 1 ms;
-- insert stimulus here
wait;

14
yasg.gise
View File

@@ -41,6 +41,7 @@
<file xil_pn:branch="BehavioralSim" xil_pn:fileType="FILE_ISIM_EXE" xil_pn:name="dds_tb_isim_beh.exe"/>
<file xil_pn:fileType="FILE_ISIM_MISC" xil_pn:name="dds_tb_isim_beh.wdb"/>
<file xil_pn:branch="Implementation" xil_pn:fileType="FILE_XST_PROJECT" xil_pn:name="dds_tb_stx_beh.prj"/>
<file xil_pn:branch="Implementation" xil_pn:fileType="FILE_XST_PROJECT" xil_pn:name="dds_vhdl.prj"/>
<file xil_pn:fileType="FILE_XRPT" xil_pn:name="dds_xst.xrpt"/>
<file xil_pn:fileType="FILE_LOG" xil_pn:name="fuse.log"/>
<file xil_pn:fileType="FILE_DIRECTORY" xil_pn:name="isim"/>
@@ -59,9 +60,8 @@
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="ReadyToRun"/>
</transform>
<transform xil_pn:end_ts="1463396197" xil_pn:in_ck="-1527320413769792740" xil_pn:name="TRAN_copyAbstractToPostAbstractSimulation" xil_pn:start_ts="1463396197">
<transform xil_pn:end_ts="1463423268" xil_pn:in_ck="-1527320413769792740" xil_pn:name="TRAN_copyAbstractToPostAbstractSimulation" xil_pn:start_ts="1463423268">
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="WarningsGenerated"/>
<status xil_pn:value="ReadyToRun"/>
<outfile xil_pn:name="dds.vhd"/>
<outfile xil_pn:name="dds_tb.vhd"/>
@@ -80,7 +80,7 @@
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="ReadyToRun"/>
</transform>
<transform xil_pn:end_ts="1463396205" xil_pn:in_ck="-1527320413769792740" xil_pn:name="TRAN_copyPostAbstractToPreSimulation" xil_pn:start_ts="1463396205">
<transform xil_pn:end_ts="1463423268" xil_pn:in_ck="-1527320413769792740" xil_pn:name="TRAN_copyPostAbstractToPreSimulation" xil_pn:start_ts="1463423268">
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="ReadyToRun"/>
<outfile xil_pn:name="dds.vhd"/>
@@ -88,11 +88,9 @@
<outfile xil_pn:name="helpers.vhd"/>
<outfile xil_pn:name="lcd_driver.vhd"/>
</transform>
<transform xil_pn:end_ts="1463396206" xil_pn:in_ck="-1527320413769792740" xil_pn:name="TRAN_ISimulateBehavioralModelRunFuse" xil_pn:prop_ck="-6917596232395121981" xil_pn:start_ts="1463396205">
<transform xil_pn:end_ts="1463423273" xil_pn:in_ck="-1527320413769792740" xil_pn:name="TRAN_ISimulateBehavioralModelRunFuse" xil_pn:prop_ck="-6917596232395121981" xil_pn:start_ts="1463423268">
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="ReadyToRun"/>
<status xil_pn:value="OutOfDateForOutputs"/>
<status xil_pn:value="OutputChanged"/>
<outfile xil_pn:name="dds_tb_beh.prj"/>
<outfile xil_pn:name="dds_tb_isim_beh.exe"/>
<outfile xil_pn:name="fuse.log"/>
@@ -100,7 +98,7 @@
<outfile xil_pn:name="isim.log"/>
<outfile xil_pn:name="xilinxsim.ini"/>
</transform>
<transform xil_pn:end_ts="1463405352" xil_pn:in_ck="5986968781955972703" xil_pn:name="TRAN_ISimulateBehavioralModel" xil_pn:prop_ck="-7301171803071747408" xil_pn:start_ts="1463405351">
<transform xil_pn:end_ts="1463423273" xil_pn:in_ck="5986968781955972703" xil_pn:name="TRAN_ISimulateBehavioralModel" xil_pn:prop_ck="-7301171803071747408" xil_pn:start_ts="1463423273">
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="ReadyToRun"/>
<outfile xil_pn:name="dds_tb_isim_beh.wdb"/>
@@ -135,7 +133,7 @@
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="ReadyToRun"/>
</transform>
<transform xil_pn:end_ts="1463396180" xil_pn:in_ck="-8475077075915550756" xil_pn:name="TRANEXT_xstsynthesize_spartan3e" xil_pn:prop_ck="-7698400163542717516" xil_pn:start_ts="1463396172">
<transform xil_pn:end_ts="1463423247" xil_pn:in_ck="-8475077075915550756" xil_pn:name="TRANEXT_xstsynthesize_spartan3e" xil_pn:prop_ck="-7698400163542717516" xil_pn:start_ts="1463423207">
<status xil_pn:value="SuccessfullyRun"/>
<status xil_pn:value="WarningsGenerated"/>
<status xil_pn:value="ReadyToRun"/>