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Joined: 23 Aug 2005
Posts: 93
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| Struct? |
 Posted: Wed Dec 20, 2006 6:06 am |
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Hi,
I have a question about using structs. I have one with some different data types in it, but it seems that the floats at least, only contains a third of what it should be??? how is this possible..
Im using CCS 4.14 and a PIC 18f2525. At 20MHz.
(Also tryed to go back to ver 3.242 but no change)
| Code: | struct data{
signed int32 active;
signed int32 reactive;
uchar first_A;
uchar first_R;
long voltage;
float my_voltage;
float my_frequency;
long frequency;
float my_current;
} phase[3]; |
And writing to it as:
| Code: |
for(i=0;i<3;i++){
new_val= acquire(2,i);
phase[i].voltage =new_val;
phase[i].my_voltage=(float)phase[i].voltage;
phase[i].my_voltage/=(float)730;
phase[i].my_voltage*=(float)MAIN_VOLTAGE;
} |
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Ttelmah
Guest
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| Posted: Wed Dec 20, 2006 9:40 am |
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Simple answer, is that it isn't really possible.
There is nothing in the way values are stored, that relates to 1/3rd.
Add some diagnostics. Load the number into 'new_val', then print this.
As an 'aside', it'll be slightly quicker to do the second transfer as:
phase[i].my_voltage=(float)new_val;
Since accessing an array, takes longer than accessing a normal variable.
Then print 'MAIN_VOLTAGE', and the result of the arithmetic.
What is actually occurring, may become obvious when you look at the values.
Best Wishes |
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