[FPGA]: MATLAB generates COE files

One .coe Description of the document

    COE A document is a kind of ASCII text file , The file header defines the data base （Radix）, When you can 2、10 or 16. The data is given in the form of vectors , Each vector ends with a semicolon .Vivado Can parse COE File format , And in Generate IP When the kernel is exported, the related MIF Format file , For behavior level simulation .
     It is best to COE The file is placed in the IP Under the same directory （ I.e XCI The files are in the same directory ）, It's working Core Cotainer pack IP Nuclear time will also COE Package files to XCIX In file . When replacing COE When you file , The old must be deleted COE file , Otherwise, it will be transferred to the comprehensive process of the project ; We need to pay attention to , If you just delete the file on the disk , Instead of removing in the project , Will cause a report error.
    COE The general syntax format of the file is as follows ：

Keyword =Value ;  notes 
<Radix_Keyword> =Value ;  notes 
<Data_Keyword> =Data_Value1, Data_Value2, Data_Value3;

    COE Syntax is not case sensitive for keywords ; A semicolon is followed by a comment . The following are the keywords related to defining the cardinality of data values ：

    RADIX： For non storage types IP Cardinality definition of core （ such as FIR filter ）;
MEMORY_INITIALIZATION_RADIX： Define the cardinality of the memory initialization value .
The following are the keywords related to data values ：

    COEFDATA： Define the coefficients of the filter ;
MEMORY_INITIALIZATION_VECTOR： Define the data of block memory and distributed memory ;
    PATTERN： For bit correlator （Bit Correlator）COE file ;
    BRANCH_LENGTH_VECTOR： be used for Interleaver COE file .
    COE The keyword defined at the end of the file must be COEFDATA or MEMORY_INITIALIZATION_VECTOR, Later keyword definitions will be ignored . Here are a few COE Sample file .
（1）.Block Memory COE File

; This .COE file specifies the contents for a block memory of depth=16, and width=4.
memory_initialization_radix=2;
memory_initialization_vector=
1111,
1111,
1111,
1111,
1111,
0000,
0101,
0011,
0000,
1111,
1111,
1111,
1111,
1111,
1111,
1111;

（2）.FIR COE File

; Example of a Distributed Arithmetic (DA) FIR Filter .COE file
; with hex coefficients, 8 symmetrical taps, and 12-bit coefficients.
Radix = 16;
CoefData= 346, EDA, 0D6, F91, F91, 0D6, EDA, 346;

Two . coe Example of file generation

Depth is 4096, The seat width is 8

1. Sine cosine

%% sin-cos wave data write in coe file
clear all ;
clc ;
N = 4096 ;
y = zeros(N , 1) ;
for i = 1:1:N 
    x = i ;
    %y(i,1) = ceil( 127*sin(x*2*pi/N) ) + 127 ;
    y(i,1) = ceil( 127*cos(x*2*pi/N) ) + 127 ;
end   
plot(y);
hold on;
fid = fopen('cos_4096.coe','wt');    
%- standard format
fprintf( fid, 'MEMORY_INITIALIZATION_RADIX = 10;\n');                     
fprintf( fid, 'MEMORY_INITIALIZATION_VECTOR =\n');
%- write data in coe file
for i = 1:1:N
    fprintf(fid,'%d,\n',y(i,1));  
end
fclose(fid);

2. Triangle wave

%% triangle wave data write in coe file
clear all ;
clc ;
N = 4096 ;
y = zeros(N , 1) ;
for i = 1:1:N 
    if(i < 2049)
        y(i,1) = fix( (i/8) - 1 ) ;
    else
        y(i,1) = fix( ((4096 - i )/8) ) ;
    end
end   
plot(y);
hold on;
fid = fopen('triangle_4096.coe','wt');    
%- standard format
fprintf( fid, 'MEMORY_INITIALIZATION_RADIX = 10;\n');                     
fprintf( fid, 'MEMORY_INITIALIZATION_VECTOR =\n');
%- write data in coe file
for i = 1:1:N
    fprintf(fid,'%d,\n',y(i,1));  
end
fclose(fid);

3. Rectangular wave

%% rectangle wave data write in coe file
clear all ;
clc ;
N = 4096 ;
y = zeros(N , 1) ;
for i = 1:1:N 
    if(i < 2049)
        y(i,1) = 255 ;
    else
        y(i,1) = 0 ;
    end
end   
plot(y);
hold on;
fid = fopen('rectangle_4096.coe','wt');    
%- standard format
fprintf( fid, 'MEMORY_INITIALIZATION_RADIX = 10;\n');                     
fprintf( fid, 'MEMORY_INITIALIZATION_VECTOR =\n');
%- write data in coe file
for i = 1:1:N
    fprintf(fid,'%d,\n',y(i,1));  
end
fclose(fid);

3、 ... and . Reference material

1. Vivado Using skills （9）：COE How to use the file