Generating sinwave from array of real
0
I want to generate sinewave from array of real.
Here is array with 12 samples of sine
type memory_type is array (0 to 11) of real;
signal sine : memory_type :=0.50,0.7,0.95,0.99,0.88,0.64,0.36,0.12,0.01,0.05,0.23,0.50);
and i signal for iterations:
signal i : integer range 0 to 10 :=0;
Here is the process which generates 2kHz wave based on samples
process(clk_2kHz)
begin
if (rst = '1') then
i <= 0;
elsif(rising_edge(clk_2kHz)) then
dataout <= sine(i);
i <= i + 1;
if (i = 11) then
i<= 0;
end if;
end if;
end process;
I want to pass this signal to LTC2624 on spartan-3E and get analog sine on output.
Problem is that i am gettin this error:
Line 94: Indexed name is not a integer
Why is this happening? I know that array contains real values but index number is integer(i think). I tried change i to real but it did not help.
Any sugestions?
vhdl
asked Nov 15 '18 at 23:59
eredineredin
53
add a comment |
0
I want to generate sinewave from array of real.
Here is array with 12 samples of sine
type memory_type is array (0 to 11) of real;
signal sine : memory_type :=0.50,0.7,0.95,0.99,0.88,0.64,0.36,0.12,0.01,0.05,0.23,0.50);
and i signal for iterations:
signal i : integer range 0 to 10 :=0;
Here is the process which generates 2kHz wave based on samples
process(clk_2kHz)
begin
if (rst = '1') then
i <= 0;
elsif(rising_edge(clk_2kHz)) then
dataout <= sine(i);
i <= i + 1;
if (i = 11) then
i<= 0;
end if;
end if;
end process;
I want to pass this signal to LTC2624 on spartan-3E and get analog sine on output.
Problem is that i am gettin this error:
Line 94: Indexed name is not a integer
Why is this happening? I know that array contains real values but index number is integer(i think). I tried change i to real but it did not help.
Any sugestions?
vhdl
asked Nov 15 '18 at 23:59
eredineredin
53
1
The only place we see in your snippet with an indexed name issine(unsigned(i));where theiis an integer and is not closely related to the array typeunsignedand ineligible for a type conversion that you don't need anyway. The index type ofmemory_typeis integer, the range is constrained and these match the declaration fori. Also note your test should beif i = 10 then i <= 0; else i <= i + 1; end if;including the increment. Your present test will get a bounds check error when simulating. Signal updates don't occur during process execution. Reals don't synthesize.
– user1155120
Nov 16 '18 at 3:32
unsigned(i) was posted here by mistake. I was checking if this would help but it not and i forgot to remove it before asking this question. Sorry about that. So if real don't sythesize - How should i represent sample data?
– eredin
Nov 16 '18 at 19:06
An LTC2624 has a 12 bit representation. Convert your samples to a binary representation with that accuracy.
– user1155120
Nov 16 '18 at 20:09
add a comment |
0
0
0
0
I want to generate sinewave from array of real.
Here is array with 12 samples of sine
type memory_type is array (0 to 11) of real;
signal sine : memory_type :=0.50,0.7,0.95,0.99,0.88,0.64,0.36,0.12,0.01,0.05,0.23,0.50);
and i signal for iterations:
signal i : integer range 0 to 10 :=0;
Here is the process which generates 2kHz wave based on samples
process(clk_2kHz)
begin
if (rst = '1') then
i <= 0;
elsif(rising_edge(clk_2kHz)) then
dataout <= sine(i);
i <= i + 1;
if (i = 11) then
i<= 0;
end if;
end if;
end process;
I want to pass this signal to LTC2624 on spartan-3E and get analog sine on output.
Problem is that i am gettin this error:
Line 94: Indexed name is not a integer
Why is this happening? I know that array contains real values but index number is integer(i think). I tried change i to real but it did not help.
Any sugestions?
vhdl
asked Nov 15 '18 at 23:59
eredineredin
53
I want to generate sinewave from array of real.
Here is array with 12 samples of sine
type memory_type is array (0 to 11) of real;
signal sine : memory_type :=0.50,0.7,0.95,0.99,0.88,0.64,0.36,0.12,0.01,0.05,0.23,0.50);
and i signal for iterations:
signal i : integer range 0 to 10 :=0;
Here is the process which generates 2kHz wave based on samples
process(clk_2kHz)
begin
if (rst = '1') then
i <= 0;
elsif(rising_edge(clk_2kHz)) then
dataout <= sine(i);
i <= i + 1;
if (i = 11) then
i<= 0;
end if;
end if;
end process;
I want to pass this signal to LTC2624 on spartan-3E and get analog sine on output.
Problem is that i am gettin this error:
Line 94: Indexed name is not a integer
Why is this happening? I know that array contains real values but index number is integer(i think). I tried change i to real but it did not help.
Any sugestions?
vhdl
vhdl
asked Nov 15 '18 at 23:59
eredineredin
53
asked Nov 15 '18 at 23:59
eredineredin
53
edited Nov 16 '18 at 11:00
eredin
asked Nov 15 '18 at 23:59
eredineredin
53
asked Nov 15 '18 at 23:59
eredineredin
53
asked Nov 15 '18 at 23:59
eredineredin
53
53
1
The only place we see in your snippet with an indexed name issine(unsigned(i));where theiis an integer and is not closely related to the array typeunsignedand ineligible for a type conversion that you don't need anyway. The index type ofmemory_typeis integer, the range is constrained and these match the declaration fori. Also note your test should beif i = 10 then i <= 0; else i <= i + 1; end if;including the increment. Your present test will get a bounds check error when simulating. Signal updates don't occur during process execution. Reals don't synthesize.
– user1155120
Nov 16 '18 at 3:32
unsigned(i) was posted here by mistake. I was checking if this would help but it not and i forgot to remove it before asking this question. Sorry about that. So if real don't sythesize - How should i represent sample data?
– eredin
Nov 16 '18 at 19:06
An LTC2624 has a 12 bit representation. Convert your samples to a binary representation with that accuracy.
– user1155120
Nov 16 '18 at 20:09
add a comment |
1
The only place we see in your snippet with an indexed name issine(unsigned(i));where theiis an integer and is not closely related to the array typeunsignedand ineligible for a type conversion that you don't need anyway. The index type ofmemory_typeis integer, the range is constrained and these match the declaration fori. Also note your test should beif i = 10 then i <= 0; else i <= i + 1; end if;including the increment. Your present test will get a bounds check error when simulating. Signal updates don't occur during process execution. Reals don't synthesize.
– user1155120
Nov 16 '18 at 3:32
unsigned(i) was posted here by mistake. I was checking if this would help but it not and i forgot to remove it before asking this question. Sorry about that. So if real don't sythesize - How should i represent sample data?
– eredin
Nov 16 '18 at 19:06
An LTC2624 has a 12 bit representation. Convert your samples to a binary representation with that accuracy.
– user1155120
Nov 16 '18 at 20:09
1
1
The only place we see in your snippet with an indexed name is
sine(unsigned(i)); where the i is an integer and is not closely related to the array type unsigned and ineligible for a type conversion that you don't need anyway. The index type of memory_type is integer, the range is constrained and these match the declaration for i. Also note your test should be if i = 10 then i <= 0; else i <= i + 1; end if; including the increment. Your present test will get a bounds check error when simulating. Signal updates don't occur during process execution. Reals don't synthesize.– user1155120
Nov 16 '18 at 3:32
The only place we see in your snippet with an indexed name is
sine(unsigned(i)); where the i is an integer and is not closely related to the array type unsigned and ineligible for a type conversion that you don't need anyway. The index type of memory_type is integer, the range is constrained and these match the declaration for i. Also note your test should be if i = 10 then i <= 0; else i <= i + 1; end if; including the increment. Your present test will get a bounds check error when simulating. Signal updates don't occur during process execution. Reals don't synthesize.– user1155120
Nov 16 '18 at 3:32
unsigned(i) was posted here by mistake. I was checking if this would help but it not and i forgot to remove it before asking this question. Sorry about that. So if real don't sythesize - How should i represent sample data?
– eredin
Nov 16 '18 at 19:06
unsigned(i) was posted here by mistake. I was checking if this would help but it not and i forgot to remove it before asking this question. Sorry about that. So if real don't sythesize - How should i represent sample data?
– eredin
Nov 16 '18 at 19:06
An LTC2624 has a 12 bit representation. Convert your samples to a binary representation with that accuracy.
– user1155120
Nov 16 '18 at 20:09
An LTC2624 has a 12 bit representation. Convert your samples to a binary representation with that accuracy.
– user1155120
Nov 16 '18 at 20:09
add a comment |
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1
The only place we see in your snippet with an indexed name is
sine(unsigned(i));where theiis an integer and is not closely related to the array typeunsignedand ineligible for a type conversion that you don't need anyway. The index type ofmemory_typeis integer, the range is constrained and these match the declaration fori. Also note your test should beif i = 10 then i <= 0; else i <= i + 1; end if;including the increment. Your present test will get a bounds check error when simulating. Signal updates don't occur during process execution. Reals don't synthesize.– user1155120
Nov 16 '18 at 3:32
unsigned(i) was posted here by mistake. I was checking if this would help but it not and i forgot to remove it before asking this question. Sorry about that. So if real don't sythesize - How should i represent sample data?
– eredin
Nov 16 '18 at 19:06
An LTC2624 has a 12 bit representation. Convert your samples to a binary representation with that accuracy.
– user1155120
Nov 16 '18 at 20:09