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/*#######################################################################################
Decodieren eines RC Summen Signals
#######################################################################################*/
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Copyright (c) 04.2007 Holger Buss
// + only for non-profit use
// + www.MikroKopter.com
// + see the File "License.txt" for further Informations
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#include "rc.h"
#include "main.h"
volatile int PPM_in
[11];
int RCQuality
= 0;
volatile unsigned char NewPpmData
= 1;
//############################################################################
//zum decodieren des PPM-Signals wird Timer1 mit seiner Input
//Capture Funktion benutzt:
void rc_sum_init
(void)
//############################################################################
{
TCCR1B
=(1<<CS11
)|(1<<CS10
)|(1<<ICES1
)|(1<<ICNC1
); //timer1 prescale 64
TIMSK1
|= _BV
(ICIE1
);
return;
}
//############################################################################
//Diese Routine startet und inizialisiert den Timer für RC
SIGNAL
(SIG_INPUT_CAPTURE1
)
//############################################################################
{
static unsigned int AltICR
=0;
signed int signal
= 0,tmp
;
static int index
;
static float RC_Quality
= 0.0F;
static int PPM_org
[11];
signal
= (unsigned int) ICR1
- AltICR
;
AltICR
= ICR1
;
//Syncronisationspause?
if ((signal
> 1500) && (signal
< 8000))
{
index
= 1;
NewPpmData
= 0; // Null bedeutet: Neue Daten
}
else
{
if(index
< 10)
{
if((signal
> 250) && (signal
< 687))
{
signal
-= 466;
// Stabiles Signal
if(abs(signal
- PPM_in
[index
]) < 6)
{
if(SenderOkay
< 200)
{
SenderOkay
+= 10;
}
}
/* Give an estimate for the Signal Level based on the RC-Jitter */
if (abs(2 * (signal
- PPM_org
[index
]) > (int) RC_Quality
))
{
RC_Quality
= 0.99F * RC_Quality
+ 0.01F * (float) abs(2 * (signal
- PPM_org
[index
])) ;
}
else
{
RC_Quality
= 0.998F * RC_Quality
+ 0.002F * (float) abs(2 * (signal
- PPM_org
[index
])) ;
}
tmp
= (3 * (PPM_in
[index
]) + signal
) / 4;
PPM_in
[index
] = tmp
;
PPM_org
[index
] = signal
;
}
else
{
RC_Quality
= 0.95F * RC_Quality
+ 0.05F * 100;
}
RC_Quality
= MIN
(100.
F, RC_Quality
);
RCQuality
= 100 - (int) RC_Quality
;
index
++;
if(index
== 5) PORTD
|= 0x20; else PORTD
&= ~
0x20; // Servosignal an J3 anlegen
if(index
== 6) PORTD
|= 0x10; else PORTD
&= ~
0x10; // Servosignal an J4 anlegen
if(index
== 7) PORTD
|= 0x08; else PORTD
&= ~
0x08; // Servosignal an J5 anlegen
}
}
}