hott_common.h

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/*
 * Copyright (C) 2013 Alexandre Bustico, Gautier Hattenberger
 *
 * This file is part of paparazzi.
 *
 * paparazzi 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 2, or (at your option)
 * any later version.
 *
 * paparazzi 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 paparazzi; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

#ifndef RC_HOTT_COMMON_H
#define RC_HOTT_COMMON_H

#include "std.h"
#include "mcu_periph/uart.h"
#include "mcu_periph/gpio.h"

/* in case you want to override RADIO_CONTROL_NB_CHANNEL */
#include "generated/airframe.h"

#define RC_PPM_TICKS_OF_USEC(_v)        ((_v) * 8 ) // USEC IN HOTT OUT
#define RC_PPM_SIGNED_TICKS_OF_USEC(_v) ((_v) * 8 ) // usec -1000 + 1000 in, HOTT out
#define USEC_OF_RC_PPM_TICKS(_v)        ((_v) / 8) // HOTT IN USEC OUT

#include "generated/radio.h"

#define HOTT_NB_CHANNEL 32
#define HOTT_BUF_LENGTH (HOTT_NB_CHANNEL*2+3+2) // 2 bytes per chennel 3 bytes header, 2 bytes CRC 

#ifndef RADIO_CONTROL_NB_CHANNEL
#define RADIO_CONTROL_NB_CHANNEL HOTT_NB_CHANNEL
#endif

#if RADIO_CONTROL_NB_CHANNEL > HOTT_NB_CHANNEL
#error "RADIO_CONTROL_NB_CHANNEL mustn't be higher than 32."
#endif

struct SHott {
  uint16_t pulses[HOTT_NB_CHANNEL]; 
  uint16_t ppm[HOTT_NB_CHANNEL];    
  bool frame_available;           
  uint8_t buffer[HOTT_BUF_LENGTH];  
  uint8_t expected_channels;      
  uint8_t idx;                      
  uint8_t status;                   
};

void hott_common_init(struct SHott *hott, struct uart_periph *dev);

void hott_common_decode_event(struct SHott *hott, struct uart_periph *dev);


extern void radio_control_impl_event(void (* _received_frame_handler)(void));

#define RadioControlEvent(_received_frame_handler) radio_control_impl_event(_received_frame_handler)


#endif /* RC_HOTT_H */