DIY-Multiprotocol-TX-Module/Multiprotocol/V761_nrf24l01.ino

/*
 This project is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
Multiprotocol is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
 
 Thanks to  Goebish ,Ported  from his deviation firmware
 */

#if defined(V761_NRF24L01_INO)

#include "iface_nrf24l01.h"

//#define V761_FORCE_ID

#define V761_PACKET_PERIOD		7060 // Timeout for callback in uSec
#define V761_INITIAL_WAIT		500
#define V761_PACKET_SIZE		8
#define V761_BIND_COUNT			200
#define V761_BIND_FREQ			0x28
#define V761_RF_NUM_CHANNELS	3

enum 
   {
    V761_BIND1 = 0,
    V761_BIND2,
    V761_DATA
   };

static void __attribute__((unused)) V761_set_checksum()
{
	uint8_t checksum = packet[0];
	for(uint8_t i=1; i<V761_PACKET_SIZE-2; i++)
		checksum += packet[i];
	if(phase == V761_BIND1)
	{
		packet[6] = checksum ^ 0xff;
		packet[7] = packet[6];
	}
	else 
	{
		checksum += packet[6];
		packet[7] = checksum ^ 0xff;
	}
}


static void __attribute__((unused)) V761_send_packet()
{
	static bool calib=false, prev_ch6=false;
	
	if(phase != V761_DATA)
	{
		packet[0] = rx_tx_addr[0];
		packet[1] = rx_tx_addr[1];
		packet[2] = rx_tx_addr[2];
		packet[3] = rx_tx_addr[3];  
		packet[4] = hopping_frequency[1];
		packet[5] = hopping_frequency[2];
		if(phase == V761_BIND2) 
			packet[6] = 0xf0; // ?
	}
	else
	{ 
		packet[0] = convert_channel_8b(THROTTLE);		// Throttle
		packet[2] = convert_channel_8b(ELEVATOR)>>1;	// Elevator

		if(sub_protocol==V761_3CH)
		{
			packet[1] = convert_channel_8b(RUDDER)>>1;	// Rudder
			packet[3] = convert_channel_8b(AILERON)>>1;	// Aileron
		}
		else
		{
			packet[1] = convert_channel_8b(AILERON)>>1;	// Aileron
			packet[3] = convert_channel_8b(RUDDER)>>1;	// Rudder
		}

		packet[5] = (packet_count++ / 3)<<6;
		packet[4] = (packet[5] == 0x40) ? 0x1a : 0x20;	// ?

		if(CH5_SW)										// Mode Expert Gyro off
			flags = 0x0c;
		else
			if(Channel_data[CH5] < CHANNEL_MIN_COMMAND)
				flags = 0x08;							// Beginer mode (Gyro on, yaw and pitch rate limited)
			else
				flags = 0x0a;							// Mid Mode ( Gyro on no rate limits)        

		if(!prev_ch6 && CH6_SW)							// -100% -> 100% launch gyro calib
			calib=!calib;
		prev_ch6 = CH6_SW;
		if(calib)
			flags |= 0x01;								// Gyro calibration

		packet[5] |= flags;

		packet[6] =  GET_FLAG(CH7_SW, 0x20) 			// Flip
					|GET_FLAG(CH8_SW, 0x08)				// RTH activation
					|GET_FLAG(CH9_SW, 0x10);			// RTH on/off
		if(sub_protocol==V761_3CH)
			packet[6] |= 0x80;							// unknown, set on original V761-1 dump but not on eachine dumps, keeping for compatibility

		//packet counter
		if(packet_count >= 12)
			packet_count = 0;
		NRF24L01_WriteReg(NRF24L01_05_RF_CH, hopping_frequency[hopping_frequency_no++]);
		if(hopping_frequency_no >= V761_RF_NUM_CHANNELS)
			hopping_frequency_no = 0;
	}
	V761_set_checksum();

	// Send
	XN297_SetPower();
	XN297_SetTxRxMode(TX_EN);
	XN297_WritePayload(packet, V761_PACKET_SIZE);
}

static void __attribute__((unused)) V761_RF_init()
{
	XN297_Configure(XN297_CRCEN, XN297_SCRAMBLED, XN297_1M);
}

static void __attribute__((unused)) V761_initialize_txid()
{
	#ifdef V761_FORCE_ID
		switch(RX_num%5)
		{
			case 1:	//Dump from air on Protonus TX
				memcpy(rx_tx_addr,(uint8_t *)"\xE8\xE4\x45\x09",4);
				memcpy(hopping_frequency,(uint8_t *)"\x0D\x21",2);
				break;
			case 2:	//Dump from air on mshagg2 TX
				memcpy(rx_tx_addr,(uint8_t *)"\xAE\xD1\x45\x09",4);
				memcpy(hopping_frequency,(uint8_t *)"\x13\x1D",2);
				break;
			case 3:	//Dump from air on MikeHRC Eachine TX
				memcpy(rx_tx_addr,(uint8_t *)"\x08\x03\x00\xA0",4);
				memcpy(hopping_frequency,(uint8_t *)"\x0D\x21",2);
				break;
			case 4:	//Dump from air on Crashanium Eachine TX
				memcpy(rx_tx_addr,(uint8_t *)"\x58\x08\x00\xA0",4);
				memcpy(hopping_frequency,(uint8_t *)"\x0D\x31",2);
				break;
			default: //Dump from SPI
				memcpy(rx_tx_addr,(uint8_t *)"\x6f\x2c\xb1\x93",4);
				memcpy(hopping_frequency,(uint8_t *)"\x14\x1e",2);
				break;
		}
	#else
		//Tested with Eachine RX
		rx_tx_addr[0]+=RX_num;
		hopping_frequency[0]=(rx_tx_addr[0]&0x0F)+0x05;
		hopping_frequency[1]=hopping_frequency[0]+0x05+(RX_num%0x2D);
	#endif

	hopping_frequency[2]=hopping_frequency[0]+0x37;

	debugln("ID: %02X %02X %02X %02X , HOP: %02X %02X %02X",rx_tx_addr[0],rx_tx_addr[1],rx_tx_addr[2],rx_tx_addr[3],hopping_frequency[0],hopping_frequency[1],hopping_frequency[2]);
}

uint16_t V761_callback()
{
	switch(phase)
	{
		case V761_BIND1:
			if(bind_counter) 
				bind_counter--;
			packet_count ++;
			XN297_RFChannel(V761_BIND_FREQ);
			XN297_SetTXAddr((uint8_t*)"\x34\x43\x10\x10", 4);
			V761_send_packet();
			if(packet_count >= 20) 
			{
				packet_count = 0;
				phase = V761_BIND2;
			}
			return 15730;
		case V761_BIND2:
			if(bind_counter) 
				bind_counter--;
			packet_count ++;
			XN297_Hopping(0);
			XN297_SetTXAddr(rx_tx_addr, 4);
			V761_send_packet();
			if(bind_counter == 0) 
			{
				phase = V761_DATA;
				BIND_DONE;
			}
			else if(packet_count >= 20) 
			{
				packet_count = 0;
				phase = V761_BIND1;
			}
			return 15730;
		case V761_DATA:
			#ifdef MULTI_SYNC
				telemetry_set_input_sync(V761_PACKET_PERIOD);
			#endif
			V761_send_packet();
			break;
	}
	return V761_PACKET_PERIOD;
}

void V761_init(void)
{
	V761_initialize_txid();
	if(IS_BIND_IN_PROGRESS)
	{
		bind_counter = V761_BIND_COUNT;
		phase = V761_BIND1;
	}
	else
	{
		XN297_SetTXAddr(rx_tx_addr, 4);
		phase = V761_DATA;
	}
		
	V761_RF_init();
	hopping_frequency_no = 0;
	packet_count = 0;
}

#endif