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POConvert a 32 bits to float value
 

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  1. POConvert a 32 bits to float value
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    <p>I am working on a DSP processor to implement a BFSK frequency hopping mechanism using C on a Linux system. On the receiver part of the program, I am getting an input of a set of samples which I de-modulate using Goertzel algorithm to determine whether the received bit was a 0 or 1. </p> <p>Right now, I am able to detect the bits individually. But I have to return the data for processing in the form of a float array. So, I need to pack every set of 32 bits received to form a float value. Right I am doing something like :</p> <pre><code>uint32_t i,j,curBit,curBlk; unint32_t *outData; //this is intiallized to address of some pre-defined location in DSP memory float *output; for(i=0; i&lt;num_os_bits; i++) //Loop for number of data bits { //Demodulate the data and set curBit=0x0000 or 0x8000 curBlk=curBlk&gt;&gt;1; curBlk=curBlk|curBit; bitsCounter+=1; if(i!=0 &amp;&amp; (bitsCounter%32)==0) //32-bits processed, save the data in array { *(outData+j)=curBlk; j+=1; curBlk=0; } } output=(float *)outData; </code></pre> <p>Now, the values of the <code>output</code> array are just the values of <code>outData</code> array with 0s after the decimal point. example: if <code>output[i]=12345</code> the `outData[i]=12345.0000'.</p> <p>But while testing the program I am generating the sample test data of bits using an array of float <code>float data[] ={123.12456,45.789,297.0956};</code></p> <p>So after the demodulation I am expecting the float array <code>output</code> to have a same values as <code>data</code> array. Is there some other method to convert 32-bits of data to a float. Should I store the received bits to a <code>char</code> array and then convert it to float.</p>
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    1. USanshu
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    1. COMethod should be correct - bit is bit, nomatter how you use it. Check actual bits before and after transformation, there should be something on this part.
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    2. CO@keltar, I have matched the bits that I use in the transmitter part and the demodulated sequence of bits. They are matching with each other. Hence my doubt with the conversion into the float array.
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    3. COIt completely doesn't matter what type your array have (well, technically - as long as it's one of unsigned integer types). What type of CPU is it? (wondering about right shift - big endinan?). What kind of 'incorrect' values are you getting? Whatever the problem, i don't think it's in the code posted above - could you make compact working sample representing your problem?
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