How to convert integer to 12 bit binary and vise versa

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A R 2020 年 3 月 5 日
コメント済み: A R 2020 年 3 月 6 日
Hello, I want to convert integers in the range -400 to +800 to 12 bit binary and vice versa.
dec= -333;
a= decimalToBinaryVector(typecast(int16(dec),'uint16'),16);
str_x = num2str(a);
The above code gives me 16 bit Binary value. I want to convert the integer to 12 bit binary and vice versa.
  2 件のコメント
A R 2020 年 3 月 5 日
編集済み: A R 2020 年 3 月 5 日
Yes Walter, the code does 12 bit conversion. It works well with positive integers, but with negative numbers, I get wrong results while converting from binary to decimal.
Y = round(b,1);
dec= Y*10;
temp = dec;
mask = temp < 0;
temp(mask) = 2^12 + temp(mask) ; %temp = 3394
a=decimalToBinaryVector(temp, 12); %a= [1 1 0 1 0 1 0 0 0 0 1 0]
% binary to decimal
str_x = num2str(a);
b=typecast(uint16(bin2dec(str_x)),'int16') % b = 3394
The output of b must be -70.199 but I get 3394 as the decimal value.



Walter Roberson
Walter Roberson 2020 年 3 月 5 日
編集済み: Walter Roberson 2020 年 3 月 5 日
mod(typecast(int16(dec), 'uint16'), 4096)
and convert to binary.
bitget(int16(dec), 12:-1:1)
which does the binary conversion. You might want to double() the output for your purposes.
  4 件のコメント
A R 2020 年 3 月 6 日
Hi Walter, your code is the perfect fit to my problem. Thanks a lot.


その他の回答 (1 件)

Steven Lord
Steven Lord 2020 年 3 月 5 日
There's no int12 data type in MATLAB. Depending on what you want to do with this data, if you have Fixed-Point Designer you could store it as an fi object. See this documentation page for the basics of how to work with fi objects.
>> A = sfi(10, 12, 0)
A =
DataTypeMode: Fixed-point: binary point scaling
Signedness: Signed
WordLength: 12
FractionLength: 0
>> bin(A)
ans =
  1 件のコメント
A R 2020 年 3 月 6 日
Hello Steven, Thanks a lot for your response. Gonna learn something new today, about Fixed point designer. Will look into the documentation page and how it fits my project and will update you..Thanks again.



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