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Vdrive2 and 16f1824
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mvanvliet



Joined: 02 Jun 2009
Posts: 123
Location: The Netherlands

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PostPosted: Tue Mar 05, 2013 9:25 am     Reply with quote
Dear Ttelmah,

at this moment I don't change the code. I don't need more than 255 characters in the sending string. But when I need it I will try your idea.

Next question about strings:

I will calculate the mean of 51 int16 samples. I did it like this:

Code:
int16 Verlies_ber = 0;
float Verlies_kort = 0;
int teller = 0;
int16 Totaal = 0;
int16 Verlies_array[52];
     
Verlies_ber = Verlies_kort * 10;                               //convert float to int16 without losing much resolution
      Verlies_array[Minuut_teller] = Verlies_ber;                               //put the int16 into an array
     
      for(teller = 0; teller <= 51; teller++)
      {
      Totaal = Totaal + verlies_array[teller];                                  //calculate the total of the numbers in the array
      }
     
      Verlies_lang = Totaal /512;                                               //Totaal / 10 * 5 / 256


I did the /512 because I read that /256 is an easy thing for the micro. Is /512 also an easy value?
Ttelmah



Joined: 11 Mar 2010
Posts: 19260

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PostPosted: Tue Mar 05, 2013 10:58 am     Reply with quote
Any fixed binary division, can be done using rotation. /256 is 'particularly easy', since it only involves fetching the high byte.

Best Wishes
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