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72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
/**
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* @file dac.cpp
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* @brief Manages signal creation using the DAC.
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*
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* Copyright (C) 2020 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 "adc.hpp" // ADC::getTimerDivisor
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#include "dac.hpp"
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DACDriver *DAC::m_driver[2] = {
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&DACD1, &DACD2
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};
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GPTDriver *DAC::m_timer = &GPTD7;
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int DAC::m_timer_user_count = 0;
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const DACConfig DAC::m_config = {
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.init = 0,
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.datamode = DAC_DHRM_12BIT_RIGHT,
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.cr = 0
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};
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const DACConversionGroup DAC::m_group_config = {
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.num_channels = 1,
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.end_cb = nullptr,
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.error_cb = nullptr,
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.trigger = DAC_TRG(2)
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};
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const GPTConfig DAC::m_timer_config = {
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.frequency = 36000000,
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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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void DAC::begin()
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{
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palSetPadMode(GPIOA, 4, PAL_MODE_INPUT_ANALOG);
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palSetPadMode(GPIOA, 5, PAL_MODE_INPUT_ANALOG);
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dacStart(m_driver[0], &m_config);
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dacStart(m_driver[1], &m_config);
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gptStart(m_timer, &m_timer_config);
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}
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void DAC::start(int channel, dacsample_t *buffer, size_t count)
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{
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if (channel >= 0 && channel < 2) {
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dacStartConversion(m_driver[channel], &m_group_config, buffer, count);
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if (m_timer_user_count == 0)
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gptStartContinuous(m_timer, ADC::getTimerDivisor());
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m_timer_user_count++;
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}
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}
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void DAC::stop(int channel)
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{
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if (channel >= 0 && channel < 2) {
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dacStopConversion(m_driver[channel]);
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if (--m_timer_user_count == 0)
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gptStopTimer(m_timer);
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}
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}
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