matlab help for fwrite

Question

anas qazaz 2013-3-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/68607-matlab-help-for-fwrite

i read matlab help about fwrite it say that write binary data to device ,not decimal you answered to my question why when i use code below

s=serial('com3','baudrate',9600);
>> set(s,'flowcontrol','none');
>> set(s,'parity','none');
>> set(s,'databit',8);
>> set(s,'stopbit',1);
>> fopen(s)
>> fwrite(s,10101010,'int8')

my 8051 receive the data via serial port and display it on led as 11111110 then when i use (s,00000110,'int8') 8051 display it 00000110 what is the wrong and what is the code to send data using fwrite in binary fourm,and how i can send like this numbers -34.3 -1.1 please heeeelp

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Answer 1

Walter Roberson 2013-3-25

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/68607-matlab-help-for-fwrite#answer_79904

在 MATLAB Online 中打开

fwrite(s, bin2dec('10101010'), 'int8');
fwrite(s, bin2dec('00000110'), 'int8');

Numbers such as -34.3 and -1.1 do not have a unique binary form. Use whatever form you prefer. You are going to have to write all the code for the 8051 to handle the decimal fractions, as the 8051 instruction set is strictly integer.