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com: 1wire interface base class[es] added. 

Added:
* A base class fot 1wire interface (both CRTP and virtual)
* An UARD based implementation derived added (both CRTP and virtual)
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Christos Houtouridis 6 years ago
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      include/utl/com/_1wire.h
  2. +412
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      include/utl/com/_1wire_uart.h

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include/utl/com/_1wire.h View File

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/*!
* \file /utl/com/_1wire.h
* \brief An 1-wire interface implementation
*
* Copyright (C) 2018 Christos Choutouridis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef __utl_com_1wire_h__
#define __utl_com_1wire_h__
#include <utl/impl/impl.h>
#include <utl/helper/crtp.h>
#include <utl/meta/sfinae.h>
#include <utl/com/_1wire_id.h>
#include <gsl/span>
using gsl::span;
namespace utl {
/*!
* \ingroup Communication
* \brief Abstract base class interface for 1-wire bus
*/
//!@{
/*!
* \brief
* Template base class for 1-wire communication interface using CRTP
* \param impl_t The CRTP type (the derived/implementation class typename).
*/
template <typename impl_t>
class _1wire_i {
_CRTP_IMPL(impl_t);
public:
using type = _1wire_i; //!< Export type as identity meta-function
//! 1-wire bus speed
enum class Speed { STD =0, OVDR };
/*!
* \name Object lifetime
*/
//!@{
protected:
_1wire_i () = default; //!< Allow constructor from derived only
~_1wire_i () = default; //!< Allow destructor from derived only
_1wire_i (const _1wire_i&) = delete; //!< No copies
_1wire_i& operator= (const _1wire_i&) = delete;
//!@}
/*!
* \name Implementation requirements
* \note
* In order for the implementation to have the following as private members too
* it need to declare this class as friend
*/
//!@{
private:
Speed speed () { return impl().speed(); } //!< Get the 1-wire bus speed
void speed (Speed s) { return impl().speed(s); } //!< Set the 1-wire bus speed
bool bit () { return impl().bit(); } //!< Read a bit from the 1-Wire bus, return it and provide the recovery time.
bool bit (bool b) { return impl().bit(b); } //!< Write a bit to the 1-Wire bus, return write status and provide the recovery time.
bool _reset () { return impl()._reset(); } //!< Generate a 1-wire reset and return the operation status
//!@}
/*!
* \name Friends api to provide functionality to all class specializations
*/
//!@{
private:
enum Command {
CMD_READ_ROM = 0x33,
CMD_OVDR_SKIP = 0x3C,
CMD_MATCH = 0x55,
CMD_OVDR_MATCH = 0x69,
CMD_SKIP = 0xCC,
CMD_ALARM_SEARCH = 0xEC,
CMD_SEARCH_ROM = 0xF0
};
template <typename _T> friend bool _1wire_i_reset (_T&, typename _T::Speed);
template <typename _T> friend byte_t _1wire_i_rw (_T&, byte_t, typename _T::Speed);
template <typename _T> friend byte_t _1wire_i_rx (_T&, typename _T::Speed);
template <typename _T> friend size_t _1wire_i_rx (_T&, span<byte_t>, typename _T::Speed);
template <typename _T> friend size_t _1wire_i_tx (_T&, byte_t, typename _T::Speed);
template <typename _T> friend size_t _1wire_i_tx (_T&, const span<byte_t>, typename _T::Speed);
template <typename _T> friend void _1wire_i_match (_T& obj, _1wire_id_t& id, typename _T::Speed s);
template <typename _T> friend void _1wire_i_match_n_ovdr (_T& obj, _1wire_id_t& id);
template <typename _T> friend void _1wire_i_skip (_T& obj, typename _T::Speed s);
template <typename _T> friend void _1wire_i_skip_n_ovdr (_T& obj);
template <typename _T> friend _1wire_id_t _1wire_i_first (_T&, typename _T::Speed, bool);
template <typename _T> friend _1wire_id_t _1wire_i_next (_T&, typename _T::Speed, bool);
//!@}
/*!
* \name User functionality provided by the interface
*/
//!@{
public:
/*!
* \brief
* Generate a 1-wire reset
* \param s Bus speed
* \return The status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
bool reset (Speed s) { return _1wire_i_reset (*this, s); };
//! Read a byte from 1-Wire bus
//! @param s The bus speed
//! @return The received byte
byte_t read (Speed s) { return _1wire_i_rx (*this, s); }
//! Read a span of bytes from 1-wire bus
//! \param data Ref to data span
//! \param s The speed to use
//! \return The number of received bytes
size_t read (span<byte_t> data, Speed s) { return _1wire_i_rx (*this, data, s); }
//! \brief Write a byte to 1-Wire bus
//! \param b The byte to write
//! \param s Bus speed to use
//! \return The number of transmitted bytes
size_t write (byte_t byte, Speed s) { return _1wire_i_tx (*this, byte, s); }
//! \brief Write a span of bytes to 1-wire bus
//! \param data Ref to data span
//! \param s Bus speed to use
//! \return The number of transmitted bytes
size_t write (const span<byte_t> data, Speed s) { return _1wire_i_tx (*this, data, s); }
/*!
* \brief
* Write a byte to 1-Wire bus and read the response
* \param b The byte to write
* \param s Bus speed to use
* \return The byte received.
*/
byte_t rw (byte_t b, Speed s) { return _1wire_i_rw (*this, b, s); }
void match (_1wire_id_t& id, Speed s) { _1wire_i_match (*this, id, s); }
void match_n_ovdr (_1wire_id_t& id) { _1wire_i_match_n_ovdr (*this, id); }
void skip (Speed s) { _1wire_i_skip (*this, s); }
void skip_n_ovdr () { _1wire_i_skip_n_ovdr (*this); }
/*!
* \brief
* 'first' operation, to search on the 1-Wire for the first device.
* This is performed by setting dec_, pos_ and cur_ to zero and then doing the search.
* \param s The bus speed
* \param alarm If set, search for alarm devices
* \return ID The romID
* \arg nullDev Indicate no [more] device[s]
*/
_1wire_id_t first (Speed s, bool alarm =false) { return _1wire_i_first (*this, s, alarm); }
/*!
* \brief
* 'next' operation, to search on the 1-Wire for the next device.
* This search is usually performed after a 'first' operation or another 'next' operation.
* Based on maxim-ic application note 187.
* \param s The bus speed
* \param alarm If set, search for alarm devices
* \return ID The romID
* \arg nullDev Indicate no [more] device[s]
*/
_1wire_id_t next (Speed s, bool alarm =false) { return _1wire_i_next (*this, s, alarm); }
//!@}
private:
_1wire_id_t dec_ {_1wire_id_t::nullDev()}; /*!<
* Hold the algorithm's select bit when a discrepancy
* is detected. We use this variable to navigate to the
* ROM tree as we store the path we take each time (0-1).
* Each bit represent a bit position in the ROM ID.
*/
_1wire_id_t pos_ {_1wire_id_t::nullDev()}; /*!<
* Hold the discrepancy position. We use this variable to
* navigate to the ROM tree as we store the crossroads(1) we encounter.
* Each bit represent a bit position in the ROM ID.
*/
_1wire_id_t cur_ {_1wire_id_t::nullDev()}; //! Current rom discrepancy state
};
/*!
* \brief
* A virtual base class implementation
* \param impl_t = virtual_tag
*/
template <>
class _1wire_i <virtual_tag> {
public:
using type = _1wire_i<virtual_tag>; //!< Export type as identity meta-function
//! 1-wire bus speed
enum class Speed { STD =0, OVDR };
/*!
* \name Object lifetime
*/
//!@{
protected:
_1wire_i () = default; //!< Allow constructor from derived only
_1wire_i (const type&) = delete; //!< No copies
type& operator= (const type&) = delete;
public:
virtual ~_1wire_i () = default; //!< Virtual default destructor
//!@}
/*!
* \name Implementation requirements
*/
//!@{
private:
virtual Speed speed () =0; //!< Get the 1-wire bus speed
virtual void speed (Speed) =0; //!< Set the 1-wire bus speed
virtual bool bit () =0; //!< Read a bit from the 1-Wire bus, return it and provide the recovery time.
virtual bool bit (bool) =0; //!< Write a bit to the 1-Wire bus, return write status and provide the recovery time.
virtual bool _reset () =0; //!< Generate a 1-wire reset and return the operation status
//!@}
/*!
* \name Friends api to provide functionality to all class specializations
*/
//!@{
private:
enum Command {
CMD_READ_ROM = 0x33,
CMD_OVDR_SKIP = 0x3C,
CMD_MATCH = 0x55,
CMD_OVDR_MATCH = 0x69,
CMD_SKIP = 0xCC,
CMD_ALARM_SEARCH = 0xEC,
CMD_SEARCH_ROM = 0xF0
};
template <typename _T> friend bool _1wire_i_reset (_T&, typename _T::Speed);
template <typename _T> friend byte_t _1wire_i_rw (_T&, byte_t, typename _T::Speed);
template <typename _T> friend byte_t _1wire_i_rx (_T&, typename _T::Speed);
template <typename _T> friend size_t _1wire_i_rx (_T&, span<byte_t>, typename _T::Speed);
template <typename _T> friend size_t _1wire_i_tx (_T&, byte_t, typename _T::Speed);
template <typename _T> friend size_t _1wire_i_tx (_T&, const span<byte_t>, typename _T::Speed);
template <typename _T> friend void _1wire_i_match (_T& obj, _1wire_id_t& id, typename _T::Speed s);
template <typename _T> friend void _1wire_i_match_n_ovdr (_T& obj, _1wire_id_t& id);
template <typename _T> friend void _1wire_i_skip (_T& obj, typename _T::Speed s);
template <typename _T> friend void _1wire_i_skip_n_ovdr (_T& obj);
template <typename _T> friend _1wire_id_t _1wire_i_first (_T&, typename _T::Speed, bool);
template <typename _T> friend _1wire_id_t _1wire_i_next (_T&, typename _T::Speed, bool);
//!@}
/*!
* \name User functionality provided by the interface
*/
//!@{
public:
/*!
* \brief
* Generate a 1-wire reset
* \param s Bus speed
* \return The status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
bool reset (Speed s) { return _1wire_i_reset (*this, s); };
//! Read a byte from 1-Wire bus
//! @param s The bus speed
//! @return The received byte
byte_t read (Speed s) { return _1wire_i_rx (*this, s); }
//! Read a span of bytes from 1-wire bus
//! \param data Ref to data span
//! \param s The speed to use
//! \return The number of received bytes
size_t read (span<byte_t> data, Speed s) { return _1wire_i_rx (*this, data, s); }
//! \brief Write a byte to 1-Wire bus
//! \param b The byte to write
//! \param s Bus speed to use
//! \return The number of transmitted bytes
size_t write (byte_t byte, Speed s) { return _1wire_i_tx (*this, byte, s); }
//! \brief Write a span of bytes to 1-wire bus
//! \param data Ref to data span
//! \param s Bus speed to use
//! \return The number of transmitted bytes
size_t write (const span<byte_t> data, Speed s) { return _1wire_i_tx (*this, data, s); }
/*!
* \brief
* Write a byte to 1-Wire bus and read the response
* \param b The byte to write
* \param s Bus speed to use
* \return The byte received.
*/
byte_t rw (byte_t b, Speed s) { return _1wire_i_rw (*this, b, s); }
void match (_1wire_id_t& id, Speed s) { _1wire_i_match (*this, id, s); }
void match_n_ovdr (_1wire_id_t& id) { _1wire_i_match_n_ovdr (*this, id); }
void skip (Speed s) { _1wire_i_skip (*this, s); }
void skip_n_ovdr () { _1wire_i_skip_n_ovdr (*this); }
/*!
* \brief
* 'first' operation, to search on the 1-Wire for the first device.
* This is performed by setting dec_, pos_ and cur_ to zero and then doing the search.
* \param s The bus speed
* \param alarm If set, search for alarm devices
* \return ID The romID
* \arg nullDev Indicate no [more] device[s]
*/
_1wire_id_t first (Speed s, bool alarm =false) { return _1wire_i_first (*this, s, alarm); }
/*!
* \brief
* 'next' operation, to search on the 1-Wire for the next device.
* This search is usually performed after a 'first' operation or another 'next' operation.
* Based on maxim-ic application note 187.
* \param s The bus speed
* \param alarm If set, search for alarm devices
* \return ID The romID
* \arg nullDev Indicate no [more] device[s]
*/
_1wire_id_t next (Speed s, bool alarm =false) { return _1wire_i_next (*this, s, alarm); }
//!@}
private:
_1wire_id_t dec_ {_1wire_id_t::nullDev()}; /*!<
* Hold the algorithm's select bit when a discrepancy
* is detected. We use this variable to navigate to the
* ROM tree as we store the path we take each time (0-1).
* Each bit represent a bit position in the ROM ID.
*/
_1wire_id_t pos_ {_1wire_id_t::nullDev()}; /*!<
* Hold the discrepancy position. We use this variable to
* navigate to the ROM tree as we store the crossroads(1) we encounter.
* Each bit represent a bit position in the ROM ID.
*/
_1wire_id_t cur_ {_1wire_id_t::nullDev()}; //! Current rom discrepancy state
};
/*!
* \name Friend API to provide common functionality to all specializations
*/
//!@{
/*!
* \brief
* Generate a 1-wire reset
* \param obj The object from which we call private members
* \param s Bus speed
* \return The status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
template <typename _T>
bool _1wire_i_reset (_T& obj, typename _T::Speed s) {
if (obj.speed () != s)
obj.speed (s);
return obj._reset ();
}
/*!
* \brief
* Write a byte to 1-Wire bus and read the response
* \param obj The object from which we call private members
* \param b The byte to write
* \param s Bus speed to use
* \return The byte received.
*/
template <typename _T>
byte_t _1wire_i_rw (_T& obj, byte_t b, typename _T::Speed s) {
byte_t ret {0};
// Select speed once
if (obj.speed () != s)
obj.speed (s);
for (uint8_t i =8; i>0 ; --i) {
ret >>= 1;
if ((b & 0x01) != 0) ret |= (obj.bit ()) ? 0x80 : 0x00;
else obj.bit (0);
b >>= 1;
/*^
* If the bit is 1 we use the read sequence, as it has the same
* waveform with write-1 and we get the slave response
* If the bit is 0, we can not read the slave response so we just write-0
*/
}
return ret;
}
/*!
* \brief Read a byte from 1-Wire bus
* \param obj The object from which we call private members
* \param s Bus speed to use
* \return The byte received.
*/
template <typename _T>
byte_t _1wire_i_rx (_T& obj, typename _T::Speed s) {
byte_t byte {0};
// Select speed once
if (obj.speed () != s)
obj.speed (s);
for (uint8_t i =8; i>0 ; --i) {
// shift bits to right as LSB comes first and mask it to MSB
byte >>= 1;
byte |= (obj.bit ()) ? 0x80 : 0x00;
}
return byte;
}
/*!
* \brief Read a span of bytes from 1-Wire bus
* \param obj The object from which we call private members
* \param data Reference to byte span
* \param s Bus speed to use
* \return The number of received bytes. Actual return data.size()
*/
template <typename _T>
size_t _1wire_i_rx (_T& obj, span<byte_t> data, typename _T::Speed s) {
// Select speed once
if (obj.speed () != s)
obj.speed (s);
for (byte_t& byte : data) {
byte = 0;
for (uint8_t i =8; i>0 ; --i) {
// shift bits to right as LSB comes first and mask it to MSB
byte >>= 1;
byte |= (obj.bit ()) ? 0x80 : 0x00;
}
}
return data.size();
}
/*!
* \brief Write a byte to 1-Wire bus
* \param obj The object from which we call private members
* \param byte The byte to write
* \param s Bus speed to use
* \return The number of transmitted bytes. So "1" of "0"
*/
template <typename _T>
size_t _1wire_i_tx (_T& obj, byte_t byte, typename _T::Speed s) {
return (_1wire_i_rw (obj, byte, s) == byte) ? 1 : 0;
}
/*!
* \brief Write a byte to 1-Wire bus
* \param obj The object from which we call private members
* \param data Reference to byte span
* \param s Bus speed to use
* \return The number of transmitted bytes.
* \note
* The procedure breaks on first transmission error
*/
template <typename _T>
size_t _1wire_i_tx (_T& obj, const span<byte_t> data, typename _T::Speed s) {
size_t ret {0};
for (byte_t byte : data) {
if (_1wire_i_rw (obj, byte, s) == byte)
++ret;
else
break;
}
return ret;
}
/*!
* Send match rom command
* \param obj The object from which we call private members
* \param id The ID to select on the bus
* \param s The speed to use for the command
*/
template <typename _T>
void _1wire_i_match (_T& obj, _1wire_id_t& id, typename _T::Speed s) {
_1wire_i_tx (obj, (s == _T::Speed::STD) ? _T::CMD_MATCH : _T::CMD_OVDR_MATCH, s);
for (uint8_t& b : id)
_1wire_i_tx (obj, b, s);
}
/*!
* Match and overdrive sequence
* \param obj The object from which we call private members
* \param id The ID to select on the bus
*/
template <typename _T>
void _1wire_i_match_n_ovdr (_T& obj, _1wire_id_t& id) {
_1wire_i_tx (obj, _T::CMD_MATCH, _T::Speed::STD);
for (uint8_t& b : id)
_1wire_i_tx (obj, b, _T::Speed::OVDR);
}
/*!
* Send skip command to the bus
* \param obj The object from which we call private members
* \param id The ID to select on the bus
*/
template <typename _T>
void _1wire_i_skip (_T& obj, typename _T::Speed s) {
_1wire_i_tx (obj, (s == _T::Speed::STD) ? _T::CMD_SKIP : _T::CMD_SKIP, s);
}
/*!
* Send the Skip and Overdrive sequence
* \param obj The object from which we call private members
*/
template <typename _T>
void _1wire_i_skip_n_ovdr (_T& obj) {
_1wire_i_tx (obj, _T::CMD_OVDR_SKIP, _T::Speed::STD);
}
/*!
* \brief
* 'first' operation, to search on the 1-Wire for the first device.
* This is performed by setting dec_, pos_ and cur_ to zero and then doing the search.
* \param obj The object from which we call private members
* \param s The bus speed
* \return ID The romID
* \arg nullDev Indicate no [more] device[s]
*/
template <typename _T>
_1wire_id_t _1wire_i_first (_T& obj, typename _T::Speed s, bool alarm) {
obj.dec_ = obj.pos_ = obj.cur_ = _1wire_id_t::nullDev();
return _1wire_i_next (obj, s, alarm);
}
/*!
* \brief
* 'next' operation, to search on the 1-Wire for the next device.
* This search is usually performed after a 'first' operation or another 'next' operation.
* Based on maxim-ic application note 187.
* \param obj The object from which we call private members
* \param s The bus speed
* \return The romID
* \arg nullDev Indicate no [more] device[s]
*/
template <typename _T>
_1wire_id_t _1wire_i_next (_T& obj, typename _T::Speed s, bool alarm) {
uint8_t b, bxx; // bit helper vars
uint8_t i;
_1wire_id_t ID;
do {
if ((obj.pos_ != _1wire_id_t::nullDev()) && (obj.dec_ >= obj.pos_)) {
// dec_ == pos_: We have found all the leafs, already
// dec_ > pos_ : Error
ID = _1wire_id_t::nullDev();
break;
}
if (!obj.reset (s)) {
ID = _1wire_id_t::nullDev();
break;
}
// Issue search command
if (alarm) obj.write (_T::CMD_ALARM_SEARCH, s);
else obj.write (_T::CMD_SEARCH_ROM, s);
// traverse entire RomID from LSB to MSB
for (i =0 ; i<64 ; ++i) {
// Get response pair bits
bxx = obj.bit (); // bit
bxx <<= 1;
bxx |= obj.bit (); // complementary bit
if (bxx == 0x00) {
// 00 - We have discrepancy
obj.cur_.bit (i, 1);
switch (_1wire_id_t::compare (obj.pos_, obj.cur_)) {
default:
case -1:
// pos_ < cur_: This discrepancy is the most far for now. Mark position and select 0.
b = 0;
//dec_.bit (i, (b = 0)); //<-- Its already 0
obj.pos_.bit (i, 1);
break;
case 0:
// pos_ == cur_: This was the last discrepancy in the last pass.
// Select the other branch this time (1)
obj.dec_.bit (i, (b = 1));
break;
case 1:
// pos_ > cur_: We had a discrepancy in a MSB than that, in a previous pass.
// Continue with the last pass decision.
b = obj.dec_.bit (i);
break;
}
// Send selection and update romid
obj.bit (b);
ID.bit (i, b);
}
else if (bxx == 0x01) {
// 01 - All bits of all ROMs are 0s
obj.bit (0);
ID.bit (i, 0);
}
else if (bxx == 0x02) {
// 10 - All bits of all ROMs are 1s
obj.bit (1);
ID.bit (i, 1);
}
else {
// 11 - No device on the bus
ID = _1wire_id_t::nullDev();
break;
}
} // for
if (i == 64 && obj.pos_ == _1wire_id_t::nullDev()) {
// Mark done with only one device
obj.pos_.bit (0, 1);
obj.dec_.bit (0, 1);
}
} while (0);
return ID;
}
//!@}
#if defined _utl_have_concepts
/*!
* \name 1-wire type interface concept
*/
template <typename T>
concept bool _1wire_c = requires (T t, typename T::Speed s, _1wire_id_t id) {
// Object type
requires not_<std::is_copy_constructible<T>::value>::value;
requires not_<std::is_copy_assignable<T>::value>::value;
// Members
// typename T::Speed;
// typename T::Command;
// Methods
{t.reset(s)} -> bool;
{t.read(s)} -> byte_t;
{t.write(0, s)} -> size_t;
{t.rw(0, s)} -> byte_t;
t.match(id, s);
t.match_n_ovdr(id);
t.skip(s);
t.skip_n_ovdr();
{t.first(s)} -> _1wire_id_t;
{t.next(s)} -> _1wire_id_t;
};
#else
namespace _1wire_i_cnpt {
using std::declval;
template <class _Tp> using try_reset_t = decltype (declval<_Tp>().reset (declval<typename _Tp::Speed>()));
template <class _Tp> using try_rw_t = decltype (declval<_Tp>().rw (declval<byte_t>(), declval<typename _Tp::Speed>()));
template <class _Tp> using try_rx1_t = decltype (declval<_Tp>().read (declval<typename _Tp::Speed>()));
template <class _Tp> using try_rx2_t = decltype (declval<_Tp>().read (declval<span<byte_t>>(), declval<typename _Tp::Speed>()));
template <class _Tp> using try_tx1_t = decltype (declval<_Tp>().write (declval<byte_t>(), declval<typename _Tp::Speed>()));
template <class _Tp> using try_tx2_t = decltype (declval<_Tp>().write (declval<const span<byte_t>>(), declval<typename _Tp::Speed>()));
template <class _Tp> using try_match_t = decltype (declval<_Tp>().match (declval<_1wire_id_t&>(), declval<typename _Tp::Speed>()));
template <class _Tp> using try_match_n_ovdr_t = decltype (declval<_Tp>().match_n_ovdr (declval<_1wire_id_t&>()));
template <class _Tp> using try_skip_t = decltype (declval<_Tp>().skip (declval<typename _Tp::Speed>()));
template <class _Tp> using try_skip_n_ovdr_t = decltype (declval<_Tp>().skip_n_ovdr ());
template <class _Tp> using try_first_t = decltype (declval<_Tp>().first (declval<typename _Tp::Speed>()));
template <class _Tp> using try_next_t = decltype (declval<_Tp>().next (declval<typename _Tp::Speed>()));
//! Primary template to catch any non 1-wire interface types
template <typename _Tp, typename =void>
struct is_1wire_ : false_ {};
//! template to catch a proper 1-wire interface type
template <typename _Tp>
struct is_1wire_ <_Tp,
void_t <
// typename _Tp::Speed,
// typename _Tp::Command,
use_if_same_t <try_reset_t <_Tp>, bool>,
use_if_same_t <try_rw_t <_Tp>, byte_t>,
use_if_same_t <try_rx1_t <_Tp>, byte_t>,
use_if_same_t <try_rx2_t <_Tp>, size_t>,
use_if_same_t <try_tx1_t <_Tp>, size_t>,
use_if_same_t <try_tx2_t <_Tp>, size_t>,
use_if_same_t <try_match_t<_Tp>, void>,
use_if_same_t <try_match_n_ovdr_t<_Tp>, void>,
use_if_same_t <try_skip_t<_Tp>, void>,
use_if_same_t <try_skip_n_ovdr_t<_Tp>, void>,
use_if_same_t <try_first_t <_Tp>, _1wire_id_t>,
use_if_same_t <try_next_t <_Tp>, _1wire_id_t>
> //!^ SFINAE may apply
> : true_ {};
}
/*!
* Value meta-programming function for 1-wire interface checking
* \param _Tp Type to check
* \return True if _Tp is a 1-wire interface
*/
template <typename _Tp>
constexpr bool _1wire_c = _1wire_i_cnpt::is_1wire_<_Tp>::value;
#endif
//!@}
} //namespace utl
#endif /* __utl_com_1wire_h__ */

+ 412
- 0
include/utl/com/_1wire_uart.h View File

@@ -0,0 +1,412 @@
/*!
* \file utl/com/_1wire_uart.h
* \brief
* A 1-wire implementation using a microprocessor's uart for bit timing
* \note
* This 1-wire implementation is based on MCU UART io functionality. In order
* to work it needs:
* 1) A Open drain tx and floating(or pull-up) rx UART pin configuration with both pins
* connected to the 1-wire bus wire
* 2) A Transmit/receive function even in blocking/polling mode
* 3) A baudrate set function
*
* Copyright (C) 2018 Christos Choutouridis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef __utl_com_1wire_uart_h__
#define __utl_com_1wire_uart_h__
#include <utl/impl/impl.h>
#include <utl/helper/crtp.h>
#include <utl/com/_1wire.h>
namespace utl {
/*!
* \ingroup Communication
* A 1-wire implementation using a microprocessor's uart for bit timing
* inherited from \ref _1wire_i base class.
* \sa _1wire_i
*/
//!@{
/*!
* \brief
* 1-wire UART interface template class using CRTP
* Using the private virtual interface we provide the interface from
* _1wire_i<>
*/
template <typename Impl_t>
class _1wire_uart_i : public _1wire_i<_1wire_uart_i<Impl_t>> {
_CRTP_IMPL(Impl_t); //! \brief Syntactic sugar to CRTP casting
friend _1wire_i <_1wire_uart_i<Impl_t>>;
public:
using type = _1wire_uart_i<Impl_t>; //!< Export type as identity meta-function
using Speed = typename _1wire_i<type>::Speed; //!< Bring bus speed
/*!
* \name Object lifetime
*/
//!@{
protected:
_1wire_uart_i () = default; //!< Allow constructor from derived only
~_1wire_uart_i () = default; //!< Allow destructor from derived only
//!@}
/*!
* \name Implementation requirements
* \note
* In order for the implementation to have the following as private members
* it also need to declare this class as friend
* for ex:
* class Foo : public _1wire_uart<Foo> {
* friend _1wire_uart<Foo>;
* byte_t UART_RW (byte_t byte);
* void UART_BR (uint32_t br);
* // ...
* };
*/
//!@{
private:
/*!
* \brief
* Implementers's (driver) read-write function. We use the following USART configuration.
* - Word Length = 8 Bits
* - Stop Bit = One Stop bit
* - Parity = No parity
* \param The byte to send
* \return The byte received.
* \note
* Due to the nature of the technique, the received byte is the actual bus
* condition during the communication frame (time slot)
*/
byte_t UART_RW (byte_t byte) { return impl().UART_RW (byte); }
/*!
* \brief
* Implementers's (driver) baudrate function.
* \param The desired Baudrate
*/
void UART_BR (uint32_t br) { impl().UART_BR (br); }
//!@}
//! \name Implementation of base requirements
//!@{
private:
//! 1-wire UART baudrates
enum BR {
BR_STD_RST =9600,
BR_OVR_RST =57600,
BR_STD =115200,
BR_OVR =921600
};
Speed _speed {Speed::STD};
Speed speed () { return _speed; } //!< Get the 1-wire bus speed
void speed (Speed s); //!< Set the 1-wire bus speed
/*!
* \brief
* Read a bit from the 1-Wire bus, return it and provide
* the recovery time.
*
* --- - - - - - - - - - - - - - - - - ------
* Read \ / X X X X X X X X X X X X X X X /
* ---- - - - - - - - - - - - - - - - -
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* < ------------- 87/11 usec ------------->
* ^
* |
* Master sample
*
* 8 bits, no parity, 1 stop
* standard: BR: 115200
* Overdrive: BR: 921600
* TX: 0xFF
* RX: {1 - 0xFF, 0 - [0x00 - 0xFE] }
*
* \return The answer
* \arg 0 Read 0
* \arg 1 Read 1 (This is also returned on transition error).
*/
bool bit () {
return (impl().UART_RW (0xFF) < 0xFF);
}
/*!
* \brief
* Send a 1-Wire write bit
* 8 bits, no parity, 1 stop
* standard: BR: 115200
* Overdrive: BR: 921600
*
* --- --------------------------------------
* Write 1 \ /
* ----
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* TX: 0xFF RX: 0xFF
*
* --- ------
* Write 0 \ /
* -------------------------------------
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* < ------------- 87/11 usec ------------->
* TX: 0x00 RX: 0x00
*
* \param b The bit to send
* \return Status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
bool bit (bool b) {
uint8_t w = (b) ? 0xFF : 0x00; // Select write frame to send
return (w == impl().UART_RW (w)); // Return status
}
bool _reset ();
//!@}
};
/*!
* Set the 1-wire bus speed for normal operation only
* \note
* We have moved the BR set functionality here to reduce the code inside bit().
* This is OK as long as the _1wire_i<> always check speed.
* \param s The desired speed
*/
template <typename Impl_t>
void _1wire_uart_i<Impl_t>::speed (Speed s) {
switch (_speed = s) {
case Speed::STD: impl().UART_BR (BR_STD); break;
case Speed::OVDR: impl().UART_BR (BR_OVR); break;
}
}
/*!
* \brief
* Generate a 1-wire reset
*
* --- ---- - - - -------
* Reset \ / \ X X X /
* -------------------- - - - -
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* < ---------- 1024/174 usec ------------->
*
* 8 bits, no parity, 1 stop
* Standard: Overdrive :
* BR: 9600, BR: 57600
* TX: 0xF0, TX: 0xF8
* RX: 0xF0 not present RX: 0xF8 not present
* less if present less if present
*
* \param t Timing
* \return The status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
template <typename Impl_t>
bool _1wire_uart_i<Impl_t>::_reset () {
// Select frame to send
uint8_t w = (_speed == Speed::STD) ? 0xF0 : 0xF8;
// Select baudrate
impl().UART_BR ((_speed == Speed::STD) ? BR_STD_RST : BR_OVR_RST);
// Send frame and check the result
return (impl().UART_RW (w) < w);
}
/*!
* \brief
* A virtual base class interface implementation.
* Using the private virtual interface we provide the interface from
* _1wire_i<virtual_tag>
* \param impl_t = virtual_tag
*/
template <>
class _1wire_uart_i<virtual_tag> : public _1wire_i<virtual_tag> {
public:
using type = _1wire_uart_i<virtual_tag>; //!< Export type as identity meta-function
using Speed = typename _1wire_i<virtual_tag>::Speed; //!< Bring bus speed
/*!
* \name Object lifetime
*/
//!@{
protected:
_1wire_uart_i () = default; //!< Allow constructor from derived only
~_1wire_uart_i () = default; //!< Allow destructor from derived only
//!@}
/*!
* \name Implementation requirements
*/
//!@{
private:
/*!
* \brief
* Implementers's (driver) read-write function. We use the following USART configuration.
* - Word Length = 8 Bits
* - Stop Bit = One Stop bit
* - Parity = No parity
* \param The byte to send
* \return The byte received.
* \note
* Due to the nature of the technique, the received byte is the actual bus
* condition during the communication frame (time slot)
*/
virtual byte_t UART_RW (byte_t byte) =0;
/*!
* \brief
* Implementers's (driver) baudrate function.
* \param The desired Baudrate
*/
virtual void UART_BR (uint32_t br) =0;
//!@}
//! \name Implementation of base requirements
//!@{
private:
//! 1-wire UART baudrates
enum BR {
BR_STD_RST =9600,
BR_OVR_RST =57600,
BR_STD =115200,
BR_OVR =921600
};
Speed _speed {Speed::STD};
Speed speed () { return _speed; } //!< Get the 1-wire bus speed
void speed (Speed s); //!< Set the 1-wire bus speed
/*!
* \brief
* Read a bit from the 1-Wire bus, return it and provide
* the recovery time.
*
* --- - - - - - - - - - - - - - - - - ------
* Read \ / X X X X X X X X X X X X X X X /
* ---- - - - - - - - - - - - - - - - -
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* < ------------- 87/11 usec ------------->
* ^
* |
* Master sample
*
* 8 bits, no parity, 1 stop
* standard: BR: 115200
* Overdrive: BR: 921600
* TX: 0xFF
* RX: {1 - 0xFF, 0 - [0x00 - 0xFE] }
*
* \return The answer
* \arg 0 Read 0
* \arg 1 Read 1 (This is also returned on transition error).
*/
bool bit () {
return (UART_RW (0xFF) < 0xFF);
}
/*!
* \brief
* Send a 1-Wire write bit
* 8 bits, no parity, 1 stop
* standard: BR: 115200
* Overdrive: BR: 921600
*
* --- --------------------------------------
* Write 1 \ /
* ----
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* TX: 0xFF RX: 0xFF
*
* --- ------
* Write 0 \ /
* -------------------------------------
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* < ------------- 87/11 usec ------------->
* TX: 0x00 RX: 0x00
*
* \param b The bit to send
* \return Status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
bool bit (bool b) {
uint8_t w = (b) ? 0xFF : 0x00; // Select write frame to send
return (w == UART_RW (w)); // Return status
}
bool _reset ();
//!@}
};
/*!
* Set the 1-wire bus speed for normal operation only
* \note
* We have moved the BR set functionality here to reduce the code inside bit().
* This is OK as long as the _1wire_i<> always check speed.
* \param s The desired speed
*/
void _1wire_uart_i<virtual_tag>::speed (Speed s) {
switch (_speed = s) {
case Speed::STD: UART_BR (BR_STD); break;
case Speed::OVDR: UART_BR (BR_OVR); break;
}
}
/*!
* \brief
* Generate a 1-wire reset
*
* --- ---- - - - -------
* Reset \ / \ X X X /
* -------------------- - - - -
* RS: | | | | | | | | | | |
* bit: ST 0 1 2 3 4 5 6 7 SP
* < ---------- 1024/174 usec ------------->
*
* 8 bits, no parity, 1 stop
* Standard: Overdrive :
* BR: 9600, BR: 57600
* TX: 0xF0, TX: 0xF8
* RX: 0xF0 not present RX: 0xF8 not present
* less if present less if present
*
* \param t Timing
* \return The status of the operation
* \arg 0 Fail
* \arg 1 Success
*/
bool _1wire_uart_i<virtual_tag>::_reset () {
// Select frame to send
uint8_t w = (_speed == Speed::STD) ? 0xF0 : 0xF8;
// Select baudrate
UART_BR ((_speed == Speed::STD) ? BR_STD_RST : BR_OVR_RST);
// Send frame and check the result
return (UART_RW (w) < w);
}
//!@}
} // namespace utl
#endif /* __utl_com_1wire_uart_h__ */

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