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/**
* @file adc.cpp
* @brief Manages signal reading through the ADC.
*
* Copyright (C) 2020 Clyne Sullivan
*
* Distributed under the GNU GPL v3 or later. You should have received a copy of
* the GNU General Public License along with this program.
* If not, see <https://www.gnu.org/licenses/>.
*/
#include "adc.hpp"
ADCDriver *ADC::m_driver = &ADCD1;
GPTDriver *ADC::m_timer = &GPTD6;
const ADCConfig ADC::m_config = {
.difsel = 0
};
ADCConversionGroup ADC::m_group_config = {
.circular = true,
.num_channels = 1,
.end_cb = ADC::conversionCallback,
.error_cb = nullptr,
.cfgr = ADC_CFGR_EXTEN_RISING | ADC_CFGR_EXTSEL_SRC(13), /* TIM6_TRGO */
.cfgr2 = ADC_CFGR2_ROVSE | ADC_CFGR2_OVSR_0 | ADC_CFGR2_OVSS_1, // Oversampling 2x
.tr1 = ADC_TR(0, 4095),
.smpr = {
ADC_SMPR1_SMP_AN5(ADC_SMPR_SMP_12P5), 0
},
.sqr = {
ADC_SQR1_SQ1_N(ADC_CHANNEL_IN5),
0, 0, 0
}
};
const GPTConfig ADC::m_timer_config = {
.frequency = 36000000,
.callback = nullptr,
.cr2 = TIM_CR2_MMS_1, /* TRGO */
.dier = 0
};
std::array<std::array<uint32_t, 4>, 6> ADC::m_rate_presets = {{
// Rate PLLSAI2N R OVERSAMPLE 2x? GPT_DIV
{/* 8k */ 16, 3, 1, 4500},
{/* 16k */ 32, 3, 1, 2250},
{/* 20k */ 40, 3, 1, 1800},
{/* 32k */ 64, 3, 1, 1125},
{/* 48k */ 24, 3, 0, 750},
{/* 96k */ 48, 3, 0, 375}
}};
adcsample_t *ADC::m_current_buffer = nullptr;
size_t ADC::m_current_buffer_size = 0;
ADC::Operation ADC::m_operation = nullptr;
unsigned int ADC::m_timer_divisor = 2;
void ADC::begin()
{
palSetPadMode(GPIOA, 0, PAL_MODE_INPUT_ANALOG);
adcStart(m_driver, &m_config);
adcSTM32EnableVREF(m_driver);
gptStart(m_timer, &m_timer_config);
setRate(Rate::R32K);
}
void ADC::start(adcsample_t *buffer, size_t count, Operation operation)
{
m_current_buffer = buffer;
m_current_buffer_size = count;
m_operation = operation;
adcStartConversion(m_driver, &m_group_config, buffer, count);
gptStartContinuous(m_timer, m_timer_divisor);
}
void ADC::stop()
{
gptStopTimer(m_timer);
adcStopConversion(m_driver);
m_current_buffer = nullptr;
m_current_buffer_size = 0;
m_operation = nullptr;
}
void ADC::setRate(ADC::Rate rate)
{
auto& preset = m_rate_presets[static_cast<int>(rate)];
auto pllnr = (preset[0] << RCC_PLLSAI2CFGR_PLLSAI2N_Pos) |
(preset[1] << RCC_PLLSAI2CFGR_PLLSAI2R_Pos);
bool oversample = preset[2] != 0;
m_timer_divisor = preset[3];
adcStop(m_driver);
// Adjust PLLSAI2
RCC->CR &= ~(RCC_CR_PLLSAI2ON);
while ((RCC->CR & RCC_CR_PLLSAI2RDY) == RCC_CR_PLLSAI2RDY);
RCC->PLLSAI2CFGR = (RCC->PLLSAI2CFGR & ~(RCC_PLLSAI2CFGR_PLLSAI2N_Msk | RCC_PLLSAI2CFGR_PLLSAI2R_Msk)) | pllnr;
RCC->CR |= RCC_CR_PLLSAI2ON;
while ((RCC->CR & RCC_CR_PLLSAI2RDY) != RCC_CR_PLLSAI2RDY);
// Set 2x oversampling
m_group_config.cfgr2 = oversample ? ADC_CFGR2_ROVSE | ADC_CFGR2_OVSR_0 | ADC_CFGR2_OVSS_1 : 0;
adcStart(m_driver, &m_config);
}
void ADC::setOperation(ADC::Operation operation)
{
m_operation = operation;
}
int ADC::getRate()
{
for (unsigned int i = 0; i < m_rate_presets.size(); i++) {
if (m_timer_divisor == m_rate_presets[i][3])
return i;
}
return -1;
}
unsigned int ADC::getTimerDivisor()
{
return m_timer_divisor;
}
void ADC::conversionCallback(ADCDriver *driver)
{
if (m_operation != nullptr) {
auto half_size = m_current_buffer_size / 2;
if (adcIsBufferComplete(driver))
m_operation(m_current_buffer + half_size, half_size);
else
m_operation(m_current_buffer, half_size);
}
}
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