WebSVN - FlightCtrl - Rev 1226 - /branches/V0.74d-FredericG/Spectrum.c

/*#######################################################################################
Decodieren eines RC Summen Signals oder Spektrum Empfänger-Satellit
#######################################################################################*/

#include "Spectrum.h"
#include "main.h"

//--------------------------------------------------------------//

//--------------------------------------------------------------//
void SpektrumBinding(void)
{
unsigned int timerTimeout = SetDelay(10000); // Timeout 10 sec.
unsigned char connected = 0;
unsigned int delaycounter;

UCSR1B &= ~(1 << RXCIE1); // disable rx-interrupt
UCSR1B &= ~(1<<RXEN1); // disable Uart-Rx
PORTD &= ~(1 << PORTD2); // disable pull-up

printf("\n\rPlease connect Spektrum receiver for binding NOW...");

while(!CheckDelay(timerTimeout))
{
if (PIND & (1 << PORTD2)) { timerTimeout = SetDelay(90); connected = 1; break; }
}

if (connected)
{

printf("ok.\n\r");
DDRD |= (1 << DDD2); // Rx as output

while(!CheckDelay(timerTimeout)); // delay after startup of RX
for (delaycounter = 0; delaycounter < 100; delaycounter++) PORTD |= (1 << PORTD2);
for (delaycounter = 0; delaycounter < 400; delaycounter++) PORTD &= ~(1 << PORTD2);

for (delaycounter = 0; delaycounter < 10; delaycounter++) PORTD |= (1 << PORTD2);
for (delaycounter = 0; delaycounter < 10; delaycounter++) PORTD &= ~(1 << PORTD2);
for (delaycounter = 0; delaycounter < 400; delaycounter++) PORTD |= (1 << PORTD2);
for (delaycounter = 0; delaycounter < 400; delaycounter++) PORTD &= ~(1 << PORTD2);

for (delaycounter = 0; delaycounter < 10; delaycounter++) PORTD |= (1 << PORTD2);
for (delaycounter = 0; delaycounter < 10; delaycounter++) PORTD &= ~(1 << PORTD2);
for (delaycounter = 0; delaycounter < 400; delaycounter++) PORTD |= (1 << PORTD2);
for (delaycounter = 0; delaycounter < 400; delaycounter++) PORTD &= ~(1 << PORTD2);

for (delaycounter = 0; delaycounter < 10; delaycounter++) PORTD |= (1 << PORTD2);
for (delaycounter = 0; delaycounter < 10; delaycounter++) PORTD &= ~(1 << PORTD2);
for (delaycounter = 0; delaycounter < 400; delaycounter++) PORTD |= (1 << PORTD2);

}
else
{ printf("Timeout.\n\r");

}

DDRD &= ~(1 << DDD2); // RX as input
PORTD &= ~(1 << PORTD2);

Uart1Init(); // init Uart again
}

//############################################################################
// zum Decodieren des Spektrum Satelliten wird USART1 benutzt.
// USART1 initialisation from killagreg
void Uart1Init(void)
//############################################################################
{
// -- Start of USART1 initialisation for Spekturm seriell-mode
// USART1 Control and Status Register A, B, C and baud rate register
uint16_t ubrr = (uint16_t) ((uint32_t) SYSCLK/(8 * 115200) - 1);
// disable RX-Interrupt
UCSR1B &= ~(1 << RXCIE1);
// disable TX-Interrupt
UCSR1B &= ~(1 << TXCIE1);
// disable DRE-Interrupt
UCSR1B &= ~(1 << UDRIE1);
// set direction of RXD1 and TXD1 pins
// set RXD1 (PD2) as an input pin
PORTD |= (1 << PORTD2);
DDRD &= ~(1 << DDD2);
// USART0 Baud Rate Register
// set clock divider

UBRR1H = (uint8_t)(ubrr>>8);
UBRR1L = (uint8_t)ubrr;
// enable double speed operation
UCSR1A |= (1 << U2X1);
// enable receiver and transmitter
//UCSR1B = (1<<RXEN1)|(1<<TXEN1);

UCSR1B = (1<<RXEN1);
// set asynchronous mode
UCSR1C &= ~(1 << UMSEL11);
UCSR1C &= ~(1 << UMSEL10);
// no parity
UCSR1C &= ~(1 << UPM11);
UCSR1C &= ~(1 << UPM10);
// 1 stop bit
UCSR1C &= ~(1 << USBS1);
// 8-bit
UCSR1B &= ~(1 << UCSZ12);
UCSR1C |= (1 << UCSZ11);
UCSR1C |= (1 << UCSZ10);
// flush receive buffer explicit
while(UCSR1A & (1<<RXC1)) UDR1;
// enable RX-interrupts at the end
UCSR1B |= (1 << RXCIE1);
// -- End of USART1 initialisation
return;
}

// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Copyright (c) Rainer Walther
// + RC-routines from original MK rc.c (c) H&I
// + Useful infos from Walter: http://www.rcgroups.com/forums/showthread.php?t=714299&page=2
// + only for non-profit use
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// 20080808 rw Modified for Spektrum AR6100 (PPM)
// 20080823 rw Add Spektrum satellite receiver on USART1 (644P only)
// 20081213 rw Add support for Spektrum DS9 Air-Tx-Module (9 channels)
// Replace AR6100-coding with original composit-signal routines
//
// ---
// Entweder Summensignal ODER Spektrum-Receiver anschließen. Nicht beides gleichzeitig betreiben!
// Binding is not implemented. Bind with external Receiver.
// Servo output J3, J4, J5 not serviced
//
// Anschuß Spektrum Receiver
//    Orange: 3V von der FC (keinesfalls an 5V anschließen!)
//    Schwarz: GND
//    Grau: RXD1 (Pin 3) auf 10-Pol FC-Stecker
//
// ---
// Satellite-Reciever connected on USART1:
//
// DX7/DX6i: One data-frame at 115200 baud every 22ms.
// DX7se: One data-frame at 115200 baud every 11ms.
//    byte1: unknown
//    byte2: unknown
//    byte3: and byte4: channel data (FLT-Mode)
//    byte5: and byte6: channel data (Roll)
//    byte7: and byte8: channel data (Nick)
//    byte9: and byte10: channel data (Gier)
//    byte11: and byte12: channel data (Gear Switch)
//    byte13: and byte14: channel data (Gas)
//    byte15: and byte16: channel data (AUX2)
//
// DS9 (9 Channel): One data-frame at 115200 baud every 11ms, alternating frame 1/2 for CH1-7 / CH8-9
// 1st Frame:
//    byte1: unknown
//    byte2: unknown
//    byte3: and byte4: channel data
//    byte5: and byte6: channel data
//    byte7: and byte8: channel data
//    byte9: and byte10: channel data
//    byte11: and byte12: channel data
//    byte13: and byte14: channel data
//    byte15: and byte16: channel data
// 2nd Frame:
//    byte1: unknown
//    byte2: unknown
//    byte3: and byte4: channel data
//    byte5: and byte6: channel data
//    byte7: and byte8: 0xffff
//    byte9: and byte10: 0xffff
//    byte11: and byte12: 0xffff
//    byte13: and byte14: 0xffff
//    byte15: and byte16: 0xffff
//
// Each channel data (16 bit= 2byte, first msb, second lsb) is arranged as:
//
// Bits: F 0 C3 C2 C1 C0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
//
// 0 means a '0' bit
// F: 1 = indicates beginning of 2nd frame for CH8-9 (DS9 only)
// C3 to C0 is the channel number. 0 to 9 (4 bit, as assigned in the transmitter)
// D9 to D0 is the channel data (10 bit) 0xaa..0x200..0x356 for 100% transmitter-travel
//
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//############################################################################
//Diese Routine startet und inizialisiert den USART1 für seriellen Spektrum satellite reciever
SIGNAL(USART1_RX_vect)
//############################################################################
{
static unsigned int Sync=0, FrameCnt=0, ByteHigh=0, ReSync=1, Frame2=0, FrameTimer;
unsigned int Channel, index;
signed int signal, tmp;
int bCheckDelay;
uint8_t c;

c = UDR1; // get data byte

if (ReSync == 1)
{
// wait for beginning of new frame
ReSync = 0;

FrameTimer = SetDelay(7); // minimum 7ms zwischen den frames
FrameCnt = 0;
Sync = 0;
ByteHigh = 0;
}
else
{
bCheckDelay = CheckDelay(FrameTimer);
if ( Sync == 0 )
{
if(bCheckDelay)
{
// nach einer Pause von mind. 7ms erstes Sync-Character gefunden
// Zeichen ignorieren, da Bedeutung unbekannt
Sync = 1;
FrameCnt ++;
}
else
{
// Zeichen kam vor Ablauf der 7ms Sync-Pause
// warten auf erstes Sync-Zeichen
}
}
else if((Sync == 1) && !bCheckDelay)
{
// zweites Sync-Character ignorieren, Bedeutung unbekannt
Sync = 2;
FrameCnt ++;
}
else if((Sync == 2) && !bCheckDelay)
{
// Datenbyte high
ByteHigh = c;

if (FrameCnt == 2)
{
// is 1st Byte of Channel-data
// Frame 1 with Channel 1-7 comming next
Frame2 = 0;
if(ByteHigh & 0x80)
{
// DS9: Frame 2 with Channel 8-9 comming next
Frame2 = 1;
}
}
Sync = 3;
FrameCnt ++;
}
else if((Sync == 3) && !bCheckDelay)
{
// Datenbyte low

// High-Byte for next channel comes next
Sync = 2;
FrameCnt ++;

index = (ByteHigh >> 2) & 0x0f;
index ++;
Channel = (ByteHigh << 8) | c;
signal = Channel & 0x3ff;
signal -= 0x200; // Offset, range 0x000..0x3ff?
signal = signal/3; // scaling to fit PPM resolution

if(index >= 0 && index <= 10)
{
// Stabiles Signal
if(abs(signal - PPM_in[index]) < 6) { if(SenderOkay < 200) SenderOkay += 10; else SenderOkay = 200;}
tmp = (3 * (PPM_in[index]) + signal) / 4;
if(tmp > signal+1) tmp--; else
if(tmp < signal-1) tmp++;
if(SenderOkay >= 180) PPM_diff[index] = ((tmp - PPM_in[index]) / 3) * 3;
else PPM_diff[index] = 0;
PPM_in[index] = tmp;
}
}
else
{
// hier stimmt was nicht: neu synchronisieren
ReSync = 1;
FrameCnt = 0;
Frame2 = 0;
}

// 16 Bytes per frame
if(FrameCnt >= 16)
{
// Frame complete
if(Frame2 == 0)
{
// Null bedeutet: Neue Daten
// nur beim ersten Frame (CH 0-7) setzen
NewPpmData = 0;
}

// new frame next, nach fruehestens 7ms erwartet
FrameCnt = 0;
Frame2 = 0;
Sync = 0;
}
// Zeit bis zum nächsten Zeichen messen
FrameTimer = SetDelay(7);
}
}

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(root)/branches/V0.74d-FredericG/Spectrum.c - Rev 1226