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ardupilot/libraries/AP_FETtecOneWire/AP_FETtecOneWire.h

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/*
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Initial protocol implementation was provided by FETtec */
/* Strongly modified by Amilcar Lucas, IAV GmbH */
#pragma once
#include <AP_HAL/AP_HAL.h>
#ifndef AP_FETTEC_ONEWIRE_ENABLED
#define AP_FETTEC_ONEWIRE_ENABLED !HAL_MINIMIZE_FEATURES && BOARD_FLASH_SIZE > 1024
#endif
// Support both full-duplex at 500Kbit/s as well as half-duplex at 2Mbit/s (optional feature)
#ifndef HAL_AP_FETTEC_HALF_DUPLEX
#define HAL_AP_FETTEC_HALF_DUPLEX 0
#endif
// Get static info from the ESCs (optional feature)
#ifndef HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
#define HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO 0
#endif
// provide beep support (optional feature)
#ifndef HAL_AP_FETTEC_ESC_BEEP
#define HAL_AP_FETTEC_ESC_BEEP 0
#endif
// provide light support (optional feature)
#ifndef HAL_AP_FETTEC_ESC_LIGHT
#define HAL_AP_FETTEC_ESC_LIGHT 0
#endif
#if AP_FETTEC_ONEWIRE_ENABLED
#define FTW_DEBUGGING 0
#if FTW_DEBUGGING
#include <stdio.h>
#define fet_debug(fmt, args ...) do {::fprintf(stderr,"FETtec: %s:%d: " fmt "\n", __FUNCTION__, __LINE__, ## args); } while(0)
#else
#define fet_debug(fmt, args ...)
#endif
#include <AP_ESC_Telem/AP_ESC_Telem.h>
#include <AP_Param/AP_Param.h>
#include <AP_Math/AP_Math.h>
#include <AP_Math/crc.h>
class AP_FETtecOneWire : public AP_ESC_Telem_Backend
{
public:
AP_FETtecOneWire();
/// Do not allow copies
AP_FETtecOneWire(const AP_FETtecOneWire &other) = delete;
AP_FETtecOneWire &operator=(const AP_FETtecOneWire&) = delete;
static const struct AP_Param::GroupInfo var_info[];
static AP_FETtecOneWire *get_singleton() {
return _singleton;
}
/// periodically called from SRV_Channels::push()
void update();
/// called from AP_Arming; should return false if arming should be
/// disallowed
bool pre_arm_check(char *failure_msg, const uint8_t failure_msg_len) const;
#if HAL_AP_FETTEC_ESC_BEEP
/**
makes all connected ESCs beep
@param beep_frequency a 8 bit value from 0-255. higher make a higher beep
*/
void beep(const uint8_t beep_frequency);
#endif
#if HAL_AP_FETTEC_ESC_LIGHT
/**
sets the racewire color for all ESCs
@param r red brightness
@param g green brightness
@param b blue brightness
*/
void led_color(const uint8_t r, const uint8_t g, const uint8_t b);
#endif
private:
static AP_FETtecOneWire *_singleton;
AP_HAL::UARTDriver *_uart;
AP_Int32 _motor_mask_parameter;
AP_Int32 _reverse_mask_parameter;
#if HAL_WITH_ESC_TELEM
AP_Int8 _pole_count_parameter;
#endif
static constexpr uint8_t FRAME_OVERHEAD = 6; ///< OneWire message frame overhead (header+tail bytes)
static constexpr uint8_t MAX_RECEIVE_LENGTH = 12; ///< OneWire max receive message payload length in bytes
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
static constexpr uint8_t SERIAL_NUMBER_LENGTH = 12; ///< ESC serial number length in bytes
#endif
/**
initialize the device driver: configure serial port, wake-up and configure ESCs
*/
void init();
/**
initialize the serial port
*/
void init_uart();
/**
scan the OneWire bus, configure the ESCs requested in the _motor_mask_parameter
*/
void configure_escs();
// states configured ESCs can be in:
enum class ESCState : uint8_t {
UNINITIALISED = 5, // when we haven't tried to send anything to the ESC
WANT_SEND_OK_TO_GET_RUNNING_SW_TYPE = 10,
WAITING_OK_FOR_RUNNING_SW_TYPE = 11,
WANT_SEND_START_FW = 20,
WAITING_OK_FOR_START_FW = 21,
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
WANT_SEND_REQ_TYPE = 30,
WAITING_ESC_TYPE = 31,
WANT_SEND_REQ_SW_VER = 40,
WAITING_SW_VER = 41,
WANT_SEND_REQ_SN = 50,
WAITING_SN = 51,
#endif
#if HAL_WITH_ESC_TELEM
WANT_SEND_SET_TLM_TYPE = 60,
WAITING_SET_TLM_TYPE_OK = 61,
#endif
WANT_SEND_SET_FAST_COM_LENGTH = 70,
WAITING_SET_FAST_COM_LENGTH_OK = 71,
RUNNING = 100,
};
class ESC {
public:
#if HAL_WITH_ESC_TELEM
uint32_t last_telem_us; ///< last time we got telemetry from this ESC
uint16_t unexpected_telem;
uint16_t error_count_at_throttle_count_overflow; ///< overflow counter for error counter from the ESCs.
bool telem_expected; ///< this ESC is fully configured and is now expected to send us telemetry
bool telem_requested; ///< this ESC is fully configured and at some point was requested to send us telemetry
#endif
uint8_t id; ///< FETtec ESC ID
uint8_t servo_ofs; ///< offset into ArduPilot servo array
bool is_awake;
void set_state(ESCState _state) {
fet_debug("Moving ESC.id=%u from state=%u to state=%u", (unsigned)id, (unsigned)state, (unsigned)_state);
state = _state;
};
ESCState state = ESCState::UNINITIALISED;
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
uint8_t serial_number[SERIAL_NUMBER_LENGTH];
uint8_t firmware_version;
uint8_t firmware_subversion;
uint8_t type;
#endif
};
uint32_t _min_fast_throttle_period_us; ///< minimum allowed fast-throttle command transmit period
uint32_t _last_not_running_warning_ms; ///< last time we warned the user their ESCs are stuffed
int32_t _motor_mask; ///< an un-mutable copy of the _motor_mask_parameter taken before _init_done goes true
int32_t _reverse_mask; ///< a copy of the _reverse_mask_parameter taken while not armed
int32_t _running_mask; ///< a bitmask of the actively running ESCs
uint32_t _last_transmit_us; ///< last time the transmit() function sent data
ESC *_escs;
uint8_t _esc_count; ///< number of allocated ESCs
uint8_t _fast_throttle_byte_count; ///< pre-calculated number of bytes required to send an entire packed throttle message
#if HAL_AP_FETTEC_HALF_DUPLEX
uint8_t _ignore_own_bytes; ///< bytes to ignore while receiving, because we have transmitted them ourselves
uint8_t _last_crc; ///< the CRC from the last sent fast-throttle command
bool _use_hdplex; ///< use asynchronous half-duplex serial communication
#endif
bool _init_done; ///< device driver is initialized; ESCs may still need to be configured
bool _invalid_mask; ///< true if the mask parameter is invalid
enum class FrameSource : uint8_t {
MASTER = 0x01, ///< master is always 0x01
BOOTLOADER = 0x02,
ESC = 0x03,
};
enum class MsgType : uint8_t
{
OK = 0,
BL_PAGE_CORRECT = 1, ///< Bootloader only
NOT_OK = 2,
BL_START_FW = 3, ///< Bootloader only - exit the boot loader and start the standard firmware
BL_PAGES_TO_FLASH = 4, ///< Bootloader only
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
REQ_TYPE = 5, ///< ESC type
REQ_SN = 6, ///< serial number
REQ_SW_VER = 7, ///< software version
#endif
#if HAL_AP_FETTEC_ESC_BEEP
BEEP = 13, ///< make noise
#endif
SET_FAST_COM_LENGTH = 26, ///< configure fast-throttle command
SET_TLM_TYPE = 27, ///< telemetry operation mode
#if HAL_AP_FETTEC_ESC_LIGHT
SET_LED_TMP_COLOR = 51, ///< set ESC's LED color
#endif
};
/**
a frame looks like:
byte 1 = frame header (master is always 0x01)
byte 2 = target ID (5bit)
byte 3 & 4 = frame type (always 0x00, 0x00 used for bootloader. here just for compatibility)
byte 5 = frame length over all bytes
byte 6 - X = request type, followed by the payload
byte X+1 = 8bit CRC
*/
template <typename T>
class PACKED PackedMessage {
public:
PackedMessage(uint8_t _esc_id, T _msg) :
esc_id(_esc_id),
msg(_msg)
{
update_checksum();
}
uint8_t frame_source { (uint8_t)FrameSource::MASTER };
uint8_t esc_id;
uint16_t frame_type { 0 }; // bootloader only, always zero
uint8_t frame_length {sizeof(T) + FRAME_OVERHEAD}; // all bytes including frame_source and checksum
T msg;
uint8_t checksum;
void update_checksum() {
checksum = crc8_dvb_update(0, (const uint8_t*)this, frame_length-1);
}
};
class PACKED OK {
public:
uint8_t msgid { (uint8_t)MsgType::OK };
};
class PACKED START_FW {
public:
uint8_t msgid { (uint8_t)MsgType::BL_START_FW };
};
class PACKED SET_FAST_COM_LENGTH {
public:
SET_FAST_COM_LENGTH(uint8_t _byte_count, uint8_t _min_esc_id, uint8_t _esc_count) :
byte_count{_byte_count},
min_esc_id{_min_esc_id},
esc_count{_esc_count}
{ }
uint8_t msgid { (uint8_t)MsgType::SET_FAST_COM_LENGTH };
uint8_t byte_count;
uint8_t min_esc_id;
uint8_t esc_count;
};
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
class PACKED REQ_TYPE {
public:
uint8_t msgid { (uint8_t)MsgType::REQ_TYPE };
};
class PACKED REQ_SW_VER {
public:
uint8_t msgid { (uint8_t)MsgType::REQ_SW_VER };
};
class PACKED REQ_SN {
public:
uint8_t msgid { (uint8_t)MsgType::REQ_SN };
};
class PACKED ESC_TYPE {
public:
ESC_TYPE(uint8_t _type) :
type{_type} { }
uint8_t type;
};
class PACKED SW_VER {
public:
SW_VER(uint8_t _version, uint8_t _subversion) :
version{_version},
subversion{_subversion}
{ }
uint8_t version;
uint8_t subversion;
};
class PACKED SN {
public:
SN(uint8_t *_sn, uint8_t snlen) {
memcpy(sn, _sn, ARRAY_SIZE(sn));
}
uint8_t sn[SERIAL_NUMBER_LENGTH];
};
#endif // HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
void pack_fast_throttle_command(const uint16_t *motor_values, uint8_t *buffer, const uint8_t length, const uint8_t esc_id_to_request_telem_from);
/*
* Messages, methods and states for dealing with ESC telemetry
*/
#if HAL_WITH_ESC_TELEM
void handle_message_telem(ESC &esc);
uint16_t _fast_throttle_cmd_count; ///< number of fast-throttle commands sent by the flight controller
/// the ESC at this offset into _escs should be the next to send a
/// telemetry request for:
uint8_t _esc_ofs_to_request_telem_from;
class PACKED SET_TLM_TYPE {
public:
SET_TLM_TYPE(uint8_t _tlm_type) :
tlm_type{_tlm_type}
{ }
uint8_t msgid { (uint8_t)MsgType::SET_TLM_TYPE };
uint8_t tlm_type;
};
class PACKED TLM {
public:
TLM(int8_t _temp, uint16_t _voltage, uint16_t _current, int16_t _rpm, uint16_t _consumption_mah, uint16_t _tx_err_count) :
temp{_temp},
voltage{_voltage},
current{_current},
rpm{_rpm},
consumption_mah{_consumption_mah},
tx_err_count{_tx_err_count}
{ }
int8_t temp; // centi-degrees
uint16_t voltage; // centi-Volt
uint16_t current; // centi-Ampere (signed?)
int16_t rpm; // centi-rpm
uint16_t consumption_mah; // milli-Ampere.hour
uint16_t tx_err_count; // CRC error count, as perceived from the ESC receiving side
};
#endif // HAL_WITH_ESC_TELEM
#if HAL_AP_FETTEC_ESC_BEEP
class PACKED Beep {
public:
Beep(uint8_t _beep_frequency) :
beep_frequency{_beep_frequency}
{ }
uint8_t msgid { (uint8_t)MsgType::BEEP };
uint8_t beep_frequency;
// add two zeros to make sure all ESCs can catch their command as we don't wait for a response here (don't blame me --pb)
uint16_t spacer = 0;
};
#endif // HAL_AP_FETTEC_ESC_BEEP
#if HAL_AP_FETTEC_ESC_LIGHT
class PACKED LEDColour {
public:
LEDColour(uint8_t _r, uint8_t _g, uint8_t _b) :
r{_r},
g{_g},
b{_b}
{ }
uint8_t msgid { (uint8_t)MsgType::SET_LED_TMP_COLOR };
uint8_t r;
uint8_t g;
uint8_t b;
// add two zeros to make sure all ESCs can catch their command as we don't wait for a response here (don't blame me --pb)
uint16_t spacer = 0;
};
#endif // HAL_AP_FETTEC_ESC_LIGHT
/*
* Methods and data for transmitting data to the ESCSs:
*/
/**
transmits data to ESCs
@param bytes bytes to transmit
@param length number of bytes to transmit
@return false there's no space in the UART for this message
*/
bool transmit(const uint8_t* bytes, const uint8_t length);
template <typename T>
bool transmit(const PackedMessage<T> &msg) {
return transmit((const uint8_t*)&msg, sizeof(msg));
}
/**
transmits configuration request data to ESCs
@param bytes bytes to transmit
@param length number of bytes to transmit
@return false if vehicle armed or there's no space in the UART for this message
*/
bool transmit_config_request(const uint8_t* bytes, const uint8_t length);
template <typename T>
bool transmit_config_request(const PackedMessage<T> &msg) {
return transmit_config_request((const uint8_t*)&msg, sizeof(msg));
}
/**
sends a single fast-throttle frame containing the throttle for all configured OneWire ESCs.
@param motor_values a 16bit array containing the throttle values that should be sent to the motors. 0-2000 where 1001-2000 is positive rotation and 999-0 reversed rotation
*/
void escs_set_values(const uint16_t *motor_values);
/*
* Methods and data for receiving data from the ESCs:
*/
// FIXME: this should be tighter - and probably calculated. Note
// that we can't request telemetry faster than the loop interval,
// which is 20ms on Plane, so that puts a constraint here. When
// using fast-throttle with 12 ESCs on Plane you could expect
// 240ms between telem updates. Why you have a Plane with 12 ESCs
// is a bit of a puzzle.
static const uint32_t max_telem_interval_us = 100000;
void handle_message(ESC &esc, const uint8_t length);
/**
reads data from the UART, calling handle_message on any message found
*/
void read_data_from_uart();
union MessageUnion {
MessageUnion() { }
PackedMessage<OK> packed_ok;
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
PackedMessage<ESC_TYPE> packed_esc_type;
PackedMessage<SW_VER> packed_sw_ver;
PackedMessage<SN> packed_sn;
#endif
#if HAL_WITH_ESC_TELEM
PackedMessage<TLM> packed_tlm;
#endif
uint8_t receive_buf[FRAME_OVERHEAD + MAX_RECEIVE_LENGTH];
} u;
static_assert(sizeof(u.packed_ok) <= sizeof(u.receive_buf),"packed_ok does not fit in receive_buf. MAX_RECEIVE_LENGTH too small?");
#if HAL_AP_FETTEC_ONEWIRE_GET_STATIC_INFO
static_assert(sizeof(u.packed_esc_type) <= sizeof(u.receive_buf),"packed_esc_type does not fit in receive_buf. MAX_RECEIVE_LENGTH too small?");
static_assert(sizeof(u.packed_sw_ver) <= sizeof(u.receive_buf),"packed_sw_ver does not fit in receive_buf. MAX_RECEIVE_LENGTH too small?");
static_assert(sizeof(u.packed_sn) <= sizeof(u.receive_buf),"packed_sn does not fit in receive_buf. MAX_RECEIVE_LENGTH too small?");
#endif
#if HAL_WITH_ESC_TELEM
static_assert(sizeof(u.packed_tlm) <= sizeof(u.receive_buf),"packed_tlm does not fit in receive_buf. MAX_RECEIVE_LENGTH too small?");
#endif
uint16_t _unknown_esc_message;
uint16_t _message_invalid_in_state_count;
uint16_t _period_too_short;
uint16_t crc_rec_err_cnt;
uint8_t _receive_buf_used;
/// shifts data to start of buffer based on magic header bytes
void move_frame_source_in_receive_buffer(const uint8_t search_start_pos = 0);
/// cut n bytes from start of buffer
void consume_bytes(const uint8_t n);
/// returns true if the first message in the buffer is OK
bool buffer_contains_ok(const uint8_t length);
};
#endif // AP_FETTEC_ONEWIRE_ENABLED