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74 lines
1.4 KiB
C++
74 lines
1.4 KiB
C++
/**
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* @file sclock.cpp
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* @brief Manages sampling rate clock speeds.
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*
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* Copyright (C) 2021 Clyne Sullivan
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*
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* Distributed under the GNU GPL v3 or later. You should have received a copy of
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* the GNU General Public License along with this program.
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* If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "sclock.hpp"
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GPTDriver *SClock::m_timer = &GPTD6;
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unsigned int SClock::m_div = 1;
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unsigned int SClock::m_runcount = 0;
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const GPTConfig SClock::m_timer_config = {
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#if defined(TARGET_PLATFORM_H7)
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.frequency = 4800000,
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#else
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.frequency = 36000000,
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#endif
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.callback = nullptr,
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.cr2 = TIM_CR2_MMS_1, /* TRGO */
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.dier = 0
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};
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const std::array<unsigned int, 6> SClock::m_rate_divs = {{
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#if defined(TARGET_PLATFORM_H7)
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/* 8k */ 600,
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/* 16k */ 300,
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/* 20k */ 240,
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/* 32k */ 150,
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/* 48k */ 100,
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/* 96k */ 50
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#else
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4500, 2250, 1800, 1125, 750, 375
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#endif
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}};
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void SClock::begin()
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{
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gptStart(m_timer, &m_timer_config);
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}
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void SClock::start()
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{
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if (m_runcount++ == 0)
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gptStartContinuous(m_timer, m_div);
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}
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void SClock::stop()
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{
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if (--m_runcount == 0)
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gptStopTimer(m_timer);
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}
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void SClock::setRate(SClock::Rate rate)
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{
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m_div = m_rate_divs[static_cast<unsigned int>(rate)];
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}
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unsigned int SClock::getRate()
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{
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for (unsigned int i = 0; i < m_rate_divs.size(); ++i) {
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if (m_rate_divs[i] == m_div)
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return i;
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}
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return static_cast<unsigned int>(-1);
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}
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