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130 lines
4.5 KiB
C++
130 lines
4.5 KiB
C++
/// @file
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/// @brief QS floating point output implementation
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/// @ingroup qs
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/// @cond
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///***************************************************************************
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/// Product: QS/C++
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/// Last updated for version 5.7.0
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/// Last updated on 2016-09-08
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///
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/// Q u a n t u m L e a P s
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/// ---------------------------
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/// innovating embedded systems
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///
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/// Copyright (C) Quantum Leaps, www.state-machine.com.
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///
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/// This program is open source software: you can redistribute it and/or
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/// modify it under the terms of the GNU General Public License as published
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/// by the Free Software Foundation, either version 3 of the License, or
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/// (at your option) any later version.
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///
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/// Alternatively, this program may be distributed and modified under the
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/// terms of Quantum Leaps commercial licenses, which expressly supersede
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/// the GNU General Public License and are specifically designed for
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/// licensees interested in retaining the proprietary status of their code.
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///
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/// This program is distributed in the hope that it will be useful,
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/// but WITHOUT ANY WARRANTY; without even the implied warranty of
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/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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/// GNU General Public License for more details.
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///
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/// You should have received a copy of the GNU General Public License
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/// along with this program. If not, see <http://www.gnu.org/licenses/>.
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///
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/// Contact information:
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/// Web: www.state-machine.com
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/// Email: info@state-machine.com
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///***************************************************************************
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/// @endcond
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#define QP_IMPL // this is QF/QK implementation
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#include "qs_port.h" // QS port
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#include "qs_pkg.h" // QS package-scope internal interface
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namespace QP {
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//****************************************************************************
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/// @note This function is only to be used through macros, never in the
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/// client code directly.
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///
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void QS::f32(uint8_t format, float32_t const d) {
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union F32Rep {
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float32_t f;
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uint32_t u;
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} fu32; // the internal binary representation
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uint8_t chksum_ = priv_.chksum; // put in a temporary (register)
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uint8_t *buf_ = priv_.buf; // put in a temporary (register)
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QSCtr head_ = priv_.head; // put in a temporary (register)
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QSCtr end_ = priv_.end; // put in a temporary (register)
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fu32.f = d; // assign the binary representation
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priv_.used += static_cast<QSCtr>(5); // 5 bytes about to be added
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QS_INSERT_ESC_BYTE(format) // insert the format byte
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for (int_t i = static_cast<int_t>(4); i != static_cast<int_t>(0); --i) {
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format = static_cast<uint8_t>(fu32.u);
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QS_INSERT_ESC_BYTE(format)
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fu32.u >>= 8;
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}
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priv_.head = head_; // save the head
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priv_.chksum = chksum_; // save the checksum
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}
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//****************************************************************************
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/// @note This function is only to be used through macros, never in the
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/// client code directly.
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///
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void QS::f64(uint8_t format, float64_t const d) {
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union F64Rep {
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float64_t d;
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struct UInt2 {
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uint32_t u1;
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uint32_t u2;
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} i;
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} fu64; // the internal binary representation
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uint8_t chksum_ = priv_.chksum;
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uint8_t *buf_ = priv_.buf;
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QSCtr head_ = priv_.head;
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QSCtr end_ = priv_.end;
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uint32_t i;
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// static constant untion to detect endianness of the machine
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static union U32Rep {
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uint32_t u32;
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uint8_t u8;
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} const endian = { static_cast<uint32_t>(1) };
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fu64.d = d; // assign the binary representation
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priv_.used += static_cast<QSCtr>(9); // 9 bytes about to be added
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QS_INSERT_ESC_BYTE(format) // insert the format byte
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// is this a big-endian machine?
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if (endian.u8 == static_cast<uint8_t>(0)) {
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// swap fu64.i.u1 <-> fu64.i.u2...
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i = fu64.i.u1;
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fu64.i.u1 = fu64.i.u2;
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fu64.i.u2 = i;
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}
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// output 4 bytes from fu64.i.u1 ...
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for (i = static_cast<uint32_t>(4); i != static_cast<uint32_t>(0); --i) {
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format = static_cast<uint8_t>(fu64.i.u1);
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QS_INSERT_ESC_BYTE(format)
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fu64.i.u1 >>= 8;
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}
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// output 4 bytes from fu64.i.u2 ...
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for (i = static_cast<uint32_t>(4); i != static_cast<uint32_t>(0); --i) {
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format = static_cast<uint8_t>(fu64.i.u2);
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QS_INSERT_ESC_BYTE(format)
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fu64.i.u2 >>= 8;
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}
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priv_.head = head_; // update the head
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priv_.chksum = chksum_; // update the checksum
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}
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} // namespace QP
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