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hashmi1122
Joined: 12 Jun 2020
Posts: 1
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| sshahryiar's map() function not working for me |
 Posted: Fri Jun 12, 2020 7:29 am |
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map() function in Code Library:
http://www.ccsinfo.com/forum/viewtopic.php?t=49501
Below is my code, it is working good without double map function (told by Shehryar).
I am not an expert and not a newbie too.
I am using PIC12F675 and i need to control the blinking rate of an LED at (PIN_A1) through Potentiometer at (PIN_A2).
For more better and longer blinking rate (delay)...
I tried double map function after visiting this post but it is not working and compiler is asking to "define" map instruction ... why is it so ???
| Code: |
#include <12f675.h>
#device ADC=8
#define GP2 PIN_A2
#device *= 8
#use delay(clock = 4MHz)
#define map
#FUSES NOWDT, NOMCLR, NOWDT, NOPROTECT, INTRC_IO, NOBROWNOUT
double map(double value, int x_min, int x_max, int y_min, int y_max);
void main()
{
unsigned int16 adc_value=0;
unsigned int16 delay_time=0;
setup_adc(ADC_CLOCK_DIV_16);
SETUP_ADC_PORTS(sAN2);
set_adc_channel(2);
delay_ms(1);
while(true)
{
set_adc_channel(2);
adc_value = read_adc();
delay_time = map(adc_value, 0, 1023, 0, 255);
delay_ms(2);
output_high(PIN_A1); // SELF IS ON
delay_ms(delay_time);
output_low(PIN_A1); // SELF IS OFF
delay_ms(delay_time);
}
}
double map(double value, int x_min, int x_max, int y_min, int y_max)
{
return (0 + (((255 - 0)/(1023 - 0)) * (value - 0)));
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Sat Jun 13, 2020 1:11 am |
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The 'double' type, does not exist on the smaller PIC's. Good thing too, even
the 'float' version, will be using a huge amount of your processor's memory
and time.... |
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temtronic
Joined: 01 Jul 2010
Posts: 9097
Location: Greensville,Ontario
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| Posted: Sat Jun 13, 2020 4:20 am |
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comment.
Have you tried using the ADC in 10 bit mode without using the map() function ??
Jay |
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Jerson
Joined: 31 Jul 2009
Posts: 122
Location: Bombay, India
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| Posted: Sun Jun 14, 2020 4:28 am |
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Firstly, the #define map conflicts with the double map() function. You should start by removing the #define map
Small systems are not suited for floats/doubles, so you should try to avoid them as best as you can. The native operations are best in 8 bit or 16 bit variables, so try using int16 or int32 where needed.
Mapping is not difficult if you know how it works.
mapped zero = z
mapped full scale = f
adc reading @ zero = a0
adc reading @ full scale = af
adc reading to be mapped to scale z-f = ain
map(ain, z,f, a0,af) = (ain-a0)/(af-a0) * (f-z)
Again, if you're working with int16 types, make sure you perform the operations as
( (ain-a0) * (f-z) ) / (af - a0)
You may need to use int32 for the (first part) |
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