Problem with a math equation (16f877a)

[martinisonline]

Math problem??...16f877a

Hy...

I'm implementing a temperature meter based in the ds1820.
It works great, but now, i 'm trying to do the high resolution mode.

i need to do a math equation that is:

temp = temp_read - 0.25 + (count_per_C - count_remain)/count_per_C

these variables are int. The 'temp' must be float because the division, right?

Can i do a divison of 2 int and return 1 float?

viewing at hyperterminal, the variable 'temp' is always 0...

I am using CCS and 16F877A.

Greats...

 

[silvio]

Re: Math problem??...16f877a

Read Dallas AN105 : **broken link removed**

First page 10 for definition of "res' and "LSB"
Then page 18 for float CalcHiResTemp(int temp9, int count_per_degree, int count_remain)

It's all you need including casting.

Do you want to know why I like more parsing at low level rather than C ?

The answer is tight code and beautiful of math :

**broken link removed**

You still need floating point maths ?

 

[martinisonline]

Re: Math problem??...16f877a

Information : while(true){ printf("Very");} usefull...
Tanks...

Do you want to know why I like more parsing at low level rather than C ?

it's more dificult, but more "inside the question"...