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Scaling issue.

 
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Picster



Joined: 04 May 2006
Posts: 2

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Scaling issue.
PostPosted: Sat May 06, 2006 8:38 pm     Reply with quote
Greetings,
I've just recently started to use ccsc. I've stumbled my way through setting up most everything i want. (reading this forum for help Smile )
I'm using an 16f876 to control an H-Bridge and controling speed via PWM with the Duty controled via analog ala EX_PWM.C.

I would like to scale the output of the analog reading to match the responce of the motor to allow for a greater degree of control. I've developed a plan of attack but seem to be smashing the data during the scaling maths.

Here is the code.


Code:

      if (input (PIN_C4)) {
                                value=read_adc();
                                delay_ms(1);
                                value = value*38;
                                value = value/256;
                                set_pwm1_duty(value + 175);
                                rtfwd();
            }



My intention is to scale the 0 - 255 from the dac to values between 216 - 242. I've seperated the maths to improve clarity.

Any comments / help / intuition would be appreciated.
e.w.
rberek



Joined: 10 Jan 2005
Posts: 207
Location: Ottawa, Canada

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PostPosted: Sat May 06, 2006 9:00 pm     Reply with quote
Is value defined as an int16?
Picster



Joined: 04 May 2006
Posts: 2

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PostPosted: Sat May 06, 2006 9:10 pm     Reply with quote
Nope it was not. Embarassed That seemed to take care of it.....now i just need to tweak the values more. Smile

Thanks for the quick response rberek!

Much obliged.
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