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146 lines
3.8 KiB
C++
146 lines
3.8 KiB
C++
/**
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* @file adc.cpp
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* @brief Manages signal reading through the ADC.
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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"
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ADCDriver *ADC::m_driver = &ADCD1;
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GPTDriver *ADC::m_timer = &GPTD6;
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const ADCConfig ADC::m_config = {
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.difsel = 0
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};
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ADCConversionGroup ADC::m_group_config = {
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.circular = true,
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.num_channels = 1,
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.end_cb = ADC::conversionCallback,
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.error_cb = nullptr,
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.cfgr = ADC_CFGR_EXTEN_RISING | ADC_CFGR_EXTSEL_SRC(13), /* TIM4_TRGO */
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.cfgr2 = 0,//ADC_CFGR2_ROVSE | ADC_CFGR2_OVSR_0 | ADC_CFGR2_OVSS_1, // Oversampling 2x
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.tr1 = ADC_TR(0, 4095),
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.smpr = {
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ADC_SMPR1_SMP_AN5(ADC_SMPR_SMP_12P5), 0
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},
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.sqr = {
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ADC_SQR1_SQ1_N(ADC_CHANNEL_IN5),
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0, 0, 0
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}
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};
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const GPTConfig ADC::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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std::array<std::array<uint32_t, 4>, 6> ADC::m_rate_presets = {{
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// Rate PLLSAI2N ADC_PRESC ADC_SMPR GPT_DIV
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{/* 16k */ 8, ADC_CCR_PRESC_DIV10, ADC_SMPR_SMP_12P5, 2250},
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{/* 20k */ 10, ADC_CCR_PRESC_DIV10, ADC_SMPR_SMP_12P5, 1800},
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{/* 32k */ 16, ADC_CCR_PRESC_DIV10, ADC_SMPR_SMP_12P5, 1125},
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{/* 48k */ 24, ADC_CCR_PRESC_DIV10, ADC_SMPR_SMP_12P5, 750},
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{/* 60k */ 30, ADC_CCR_PRESC_DIV10, ADC_SMPR_SMP_12P5, 600},
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{/* 96k */ 48, ADC_CCR_PRESC_DIV10, ADC_SMPR_SMP_12P5, 375}
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}};
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adcsample_t *ADC::m_current_buffer = nullptr;
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size_t ADC::m_current_buffer_size = 0;
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ADC::Operation ADC::m_operation = nullptr;
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unsigned int ADC::m_timer_divisor = 2;
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void ADC::begin()
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{
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palSetPadMode(GPIOA, 0, PAL_MODE_INPUT_ANALOG);
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adcStart(m_driver, &m_config);
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adcSTM32EnableVREF(m_driver);
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gptStart(m_timer, &m_timer_config);
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setRate(Rate::R96K);
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}
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void ADC::start(adcsample_t *buffer, size_t count, Operation operation)
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{
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m_current_buffer = buffer;
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m_current_buffer_size = count;
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m_operation = operation;
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adcStartConversion(m_driver, &m_group_config, buffer, count);
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gptStartContinuous(m_timer, m_timer_divisor);
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}
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void ADC::stop()
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{
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gptStopTimer(m_timer);
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adcStopConversion(m_driver);
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m_current_buffer = nullptr;
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m_current_buffer_size = 0;
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m_operation = nullptr;
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}
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void ADC::setRate(ADC::Rate rate)
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{
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auto& preset = m_rate_presets[static_cast<int>(rate)];
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auto plln = preset[0] << RCC_PLLSAI2CFGR_PLLSAI2N_Pos;
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auto presc = preset[1] << ADC_CCR_PRESC_Pos;
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auto smp = preset[2];
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m_timer_divisor = preset[3];
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adcStop(m_driver);
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// Adjust PLLSAI2
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RCC->CR &= ~(RCC_CR_PLLSAI2ON);
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while ((RCC->CR & RCC_CR_PLLSAI2RDY) == RCC_CR_PLLSAI2RDY);
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RCC->PLLSAI2CFGR = (RCC->PLLSAI2CFGR & ~(RCC_PLLSAI2CFGR_PLLSAI2N_Msk)) | plln;
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RCC->CR |= RCC_CR_PLLSAI2ON;
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// Set ADC prescaler
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m_driver->adcc->CCR = (m_driver->adcc->CCR & ~(ADC_CCR_PRESC_Msk)) | presc;
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// Set sampling time
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m_group_config.smpr[0] = ADC_SMPR1_SMP_AN5(smp);
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adcStart(m_driver, &m_config);
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}
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void ADC::setOperation(ADC::Operation operation)
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{
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m_operation = operation;
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}
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int ADC::getRate()
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{
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for (unsigned int i = 0; i < m_rate_presets.size(); i++) {
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if (m_timer_divisor == m_rate_presets[i][3])
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return i;
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}
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return -1;
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}
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unsigned int ADC::getTimerDivisor()
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{
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return m_timer_divisor;
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}
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void ADC::conversionCallback(ADCDriver *driver)
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{
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if (m_operation != nullptr) {
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auto half_size = m_current_buffer_size / 2;
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if (adcIsBufferComplete(driver))
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m_operation(m_current_buffer + half_size, half_size);
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else
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m_operation(m_current_buffer, half_size);
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}
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}
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