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How to convert a float in two int8

 
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pilar



Joined: 30 Jan 2008
Posts: 197

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How to convert a float in two int8
PostPosted: Thu Sep 10, 2009 11:45 am     Reply with quote

Hi, I have a result of reading a sensor expressed in float with 2 decimal (TEM), I want to convert this number float in two int8 to TX to a PC (buffer_tx[0] and buffer_tx[1]), how I can do it?

Code:
int buffer_tx[2];

printf("%f\r\n",TEMP);    // print 27.50

PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu Sep 10, 2009 12:21 pm     Reply with quote

Look at the floor() function in the CCS manual. It shows an example
of how to get the fractional part of the floating point number.
Then with some math and the atoi() function, you can convert each part
into an 8-bit integer value.
SherpaDoug



Joined: 07 Sep 2003
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PostPosted: Thu Sep 10, 2009 2:37 pm     Reply with quote

Maybe you are looking for the make8() function? It is well documented in the manual once you know what it is called. A float is not going to fit in 2 bytes without some work.
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PCM programmer



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PostPosted: Thu Sep 10, 2009 3:19 pm     Reply with quote

pilar wants to take a floating point number in this format xx.yy, and
convert the xx and the yy into 8-bit integers, and transmit them as two
bytes. I didn't write a routine, I just pointed out the floor() function,
because I think pilar should try to do it first.
pilar



Joined: 30 Jan 2008
Posts: 197

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PostPosted: Thu Sep 10, 2009 9:39 pm     Reply with quote

Hi PCM programmer, thank you, I did not know this function.
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