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sabobey
Joined: 19 Oct 2008
Posts: 6
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| pyd 1998 12f675 |
 Posted: Tue Jul 31, 2012 4:07 am |
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#include <12F675.h>
#use delay (clock=4000000)
#fuses INTRC_IO,NOWDT,NOPUT,NOPROTECT,NOMCLR
#define sens PIN_A1
int8 i,j;
int16 data=0,dat;
void main() {
SET_TRIS_A (0b00001111);
while(true)
{
data=0;
input(sens);
while(input(sens)){
delay_cycles(60);
for (i=0; i < 15; i++){
output_low(sens);
delay_cycles(25);
output_low(sens);
delay_cycles(25);
output_high(sens);
input(sens);
Data <<=1;
}
output_low(sens);
delay_cycles(200);
input(sens);
delay_cycles(200);
dat=data;
}
}
}
pyd 1998
how to get into data |
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ezflyr
Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA
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| Posted: Tue Jul 31, 2012 8:01 am |
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Hi sabobey,
It's clear that you don't "get it" on a whole bunch of levels. Here is what I mean:
1. This is now the THIRD thread that is going on the 12F675/PYD1998. Don't do that, use the original thread to get help on this subject.
2. You didn't use the 'Code' tags when posting your code, so the formatting was not preserved. This makes the code very hard to read.
3. You simply dumped a bunch of code on us without telling us what works, and what doesn't work. The majority of us will not have a PYD1998 to test, so any extra troubleshooting information you can give us will be very important!!
John |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Tue Jul 31, 2012 8:53 am |
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I think the other threads have been locked, which is why he is trying again.
At least an attempt at the code. 
As EzFlyr says - _learn to use the code buttons_.
| Code: |
#include <12F675.h>
#use delay (clock=4000000)
#fuses INTRC_IO,NOWDT,NOPUT,NOPROTECT,NOMCLR
#define sens PIN_A1
int16 read_sensor(void) {
int n;
int16 data=0; //ensure value starts clear
delay_us(25); //must delay 25uSec after the pin goes high
for (n=0;n<15;n++) {
output_low(sens);
delay_cycles(1); //at 4MHz this is 1uSec - plenty
output_high(sens);
output_float(sens); //sets the pin 'undriven'
data<<=1;
delay_us(3); //may need tweaking
if (input(sens))
bit_set(data,0); //quicker than addition on the PIC for this
}
output_low(sens);
delay_cycles(1);
output_float(sens);
return(data);
}
void main(void) {
signed int16 val;
do {
if (input(sens)) {
val=read_sensor();
//now you have to do 'something' with the number
}
} while (TRUE);
}
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You don't need to set tris, the compiler does this for you when you read/write the port.
This should return the raw 'number'. However you will need to have an initial 'setup' phase, where you cover the sensor, and take a reading, then subtract this value from the incoming readings to get the 'delta'. You might need to consider using a 'signed' value for doing this - why I put the result into a signed....
What you now 'do' with this number depends on what you are actually after.
The only thing that may need 'tweaking' is the delay after the pin is set to float. They use 5uSec total in the example. However the 16bit rotation will already have taken a few uSec at 4MHz, so I have cut it to 3uSec. They say to experiment....
Best Wishes |
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sabobey
Joined: 19 Oct 2008
Posts: 6
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| Posted: Tue Jul 31, 2012 12:37 pm |
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Hi ezflyr
Thank you.
I will take into account your suggestion.
Hi Ttelmah thank you for your help. |
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