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/**
* @file adc.hpp
* @brief Wrapper for ChibiOS's ADCDriver.
*
* 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/>.
*/
#ifndef STMDSP_ADC_HPP_
#define STMDSP_ADC_HPP_
#include "hal.h"
class ADCd;
struct ADCdConfig : public ADCConfig
{
ADCd *adcdinst;
};
enum class ADCdRate : unsigned int {
R2P5,
R6P5,
R12P5,
R24P5,
R47P5,
R92P5,
R247P5,
R640P5
};
class ADCd
{
public:
constexpr static const unsigned int CLOCK_RATE = 40000000;
constexpr static unsigned int SAMPLES_PER_SECOND(ADCdRate rate) {
unsigned int sps = 0;
switch (rate) {
case ADCdRate::R2P5:
sps = 15;
break;
case ADCdRate::R6P5:
sps = 19;
break;
case ADCdRate::R12P5:
sps = 25;
break;
case ADCdRate::R24P5:
sps = 37;
break;
case ADCdRate::R47P5:
sps = 60;
break;
case ADCdRate::R92P5:
sps = 105;
break;
case ADCdRate::R247P5:
sps = 260;
break;
case ADCdRate::R640P5:
sps = 653;
break;
}
return static_cast<unsigned int>(1.f / (sps / static_cast<float>(CLOCK_RATE)));
}
constexpr explicit ADCd(ADCDriver& adcd, GPTDriver& gptd) :
m_adcd(&adcd), m_gptd(&gptd), m_adc_config{},
m_adc_group_config(ADC_GROUP_CONFIG),
m_is_adc_finished(false) {}
void start();
adcsample_t *getSamples(adcsample_t *buffer, size_t count);
void setSampleRate(ADCdRate rate);
private:
static const GPTConfig m_gpt_config;
ADCDriver *m_adcd;
GPTDriver *m_gptd;
ADCdConfig m_adc_config;
ADCConversionGroup m_adc_group_config;
bool m_is_adc_finished;
void initPins();
//void selectPins(bool a0, bool a1);
static void adcEndCallback(ADCDriver *adcd);
constexpr static const ADCConversionGroup ADC_GROUP_CONFIG = {
.circular = false,
.num_channels = 1,
.end_cb = ADCd::adcEndCallback,
.error_cb = nullptr,
.cfgr = ADC_CFGR_EXTEN_RISING |
ADC_CFGR_EXTSEL_SRC(12), /* TIM4_TRGO */
.cfgr2 = 0,
.tr1 = ADC_TR(0, 4095),
.smpr = {
ADC_SMPR1_SMP_AN5(ADC_SMPR_SMP_247P5), 0
},
.sqr = {
ADC_SQR1_SQ1_N(ADC_CHANNEL_IN5),
0, 0, 0
}
};
};
#endif // STMDSP_ADC_HPP_
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