208 lines
7.8 KiB
C
208 lines
7.8 KiB
C
/* Copyright 2019 Drew Mills
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "analog.h"
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#include "quantum.h"
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/* User configurable ADC options */
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#ifndef ADC_CIRCULAR_BUFFER
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# define ADC_CIRCULAR_BUFFER FALSE
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#endif
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#ifndef ADC_NUM_CHANNELS
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# define ADC_NUM_CHANNELS 1
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#elif ADC_NUM_CHANNELS != 1
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# error "The ARM ADC implementation currently only supports reading one channel at a time."
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#endif
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#ifndef ADC_BUFFER_DEPTH
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# define ADC_BUFFER_DEPTH 2
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#endif
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// For more sampling rate options, look at hal_adc_lld.h in ChibiOS
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#ifndef ADC_SAMPLING_RATE
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# define ADC_SAMPLING_RATE ADC_SMPR_SMP_1P5
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#endif
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// Options are 12, 10, 8, and 6 bit.
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#ifndef ADC_RESOLUTION
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# define ADC_RESOLUTION ADC_CFGR1_RES_12BIT
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#endif
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static ADCConfig adcCfg = {};
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static adcsample_t sampleBuffer[ADC_NUM_CHANNELS * ADC_BUFFER_DEPTH];
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// Initialize to max number of ADCs, set to empty object to initialize all to false.
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#if defined(STM32F0XX)
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static bool adcInitialized[1] = {};
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#elif defined(STM32F3XX)
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static bool adcInitialized[4] = {};
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#else
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# error "adcInitialized has not been implemented for this ARM microcontroller."
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#endif
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static ADCConversionGroup adcConversionGroup = {
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ADC_CIRCULAR_BUFFER,
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(uint16_t)(ADC_NUM_CHANNELS),
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NULL, // No end callback
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NULL, // No error callback
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#if defined(STM32F0XX)
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ADC_CFGR1_CONT | ADC_RESOLUTION,
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ADC_TR(0, 0).ADC_SAMPLING_RATE,
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NULL, // Doesn't specify a default channel
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#elif defined(STM32F3XX)
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ADC_CFGR_CONT | ADC_RESOLUTION,
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ADC_TR(0, 4095),
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{
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ADC_SAMPLING_RATE,
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ADC_SAMPLING_RATE,
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},
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{
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0, // Doesn't specify a default channel
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0,
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0,
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0,
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},
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#endif
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};
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static inline ADCDriver* intToADCDriver(uint8_t adcInt) {
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ADCDriver* target;
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switch (adcInt) {
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// clang-format off
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#if STM32_ADC_USE_ADC1
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case 0: target = &ADCD1; break;
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#endif
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#if STM32_ADC_USE_ADC2
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case 1: target = &ADCD2; break;
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#endif
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#if STM32_ADC_USE_ADC3
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case 2: target = &ADCD3; break;
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#endif
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#if STM32_ADC_USE_ADC4
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case 3: target = &ADCD4; break;
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#endif
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default: target = NULL; break;
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// clang-format on
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}
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return target;
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}
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static inline void manageAdcInitializationDriver(uint8_t adc, ADCDriver* adcDriver) {
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if (!adcInitialized[adc]) {
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adcStart(adcDriver, &adcCfg);
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adcInitialized[adc] = true;
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}
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}
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static inline void manageAdcInitialization(uint8_t adc) { manageAdcInitializationDriver(adc, intToADCDriver(adc)); }
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pin_and_adc pinToMux(pin_t pin) {
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switch (pin) {
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// clang-format off
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#if defined(STM32F0XX)
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case A0: return (pin_and_adc){ ADC_CHANNEL_IN0, 0 };
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case A1: return (pin_and_adc){ ADC_CHANNEL_IN1, 0 };
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case A2: return (pin_and_adc){ ADC_CHANNEL_IN2, 0 };
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case A3: return (pin_and_adc){ ADC_CHANNEL_IN3, 0 };
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case A4: return (pin_and_adc){ ADC_CHANNEL_IN4, 0 };
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case A5: return (pin_and_adc){ ADC_CHANNEL_IN5, 0 };
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case A6: return (pin_and_adc){ ADC_CHANNEL_IN6, 0 };
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case A7: return (pin_and_adc){ ADC_CHANNEL_IN7, 0 };
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case B0: return (pin_and_adc){ ADC_CHANNEL_IN8, 0 };
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case B1: return (pin_and_adc){ ADC_CHANNEL_IN9, 0 };
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case C0: return (pin_and_adc){ ADC_CHANNEL_IN10, 0 };
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case C1: return (pin_and_adc){ ADC_CHANNEL_IN11, 0 };
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case C2: return (pin_and_adc){ ADC_CHANNEL_IN12, 0 };
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case C3: return (pin_and_adc){ ADC_CHANNEL_IN13, 0 };
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case C4: return (pin_and_adc){ ADC_CHANNEL_IN14, 0 };
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case C5: return (pin_and_adc){ ADC_CHANNEL_IN15, 0 };
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#elif defined(STM32F3XX)
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case A0: return (pin_and_adc){ ADC_CHANNEL_IN1, 0 };
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case A1: return (pin_and_adc){ ADC_CHANNEL_IN2, 0 };
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case A2: return (pin_and_adc){ ADC_CHANNEL_IN3, 0 };
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case A3: return (pin_and_adc){ ADC_CHANNEL_IN4, 0 };
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case A4: return (pin_and_adc){ ADC_CHANNEL_IN1, 1 };
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case A5: return (pin_and_adc){ ADC_CHANNEL_IN2, 1 };
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case A6: return (pin_and_adc){ ADC_CHANNEL_IN3, 1 };
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case A7: return (pin_and_adc){ ADC_CHANNEL_IN4, 1 };
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case B0: return (pin_and_adc){ ADC_CHANNEL_IN12, 2 };
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case B1: return (pin_and_adc){ ADC_CHANNEL_IN1, 2 };
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case B2: return (pin_and_adc){ ADC_CHANNEL_IN12, 1 };
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case B12: return (pin_and_adc){ ADC_CHANNEL_IN2, 3 };
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case B13: return (pin_and_adc){ ADC_CHANNEL_IN3, 3 };
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case B14: return (pin_and_adc){ ADC_CHANNEL_IN4, 3 };
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case B15: return (pin_and_adc){ ADC_CHANNEL_IN5, 3 };
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case C0: return (pin_and_adc){ ADC_CHANNEL_IN6, 0 }; // Can also be ADC2
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case C1: return (pin_and_adc){ ADC_CHANNEL_IN7, 0 }; // Can also be ADC2
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case C2: return (pin_and_adc){ ADC_CHANNEL_IN8, 0 }; // Can also be ADC2
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case C3: return (pin_and_adc){ ADC_CHANNEL_IN9, 0 }; // Can also be ADC2
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case C4: return (pin_and_adc){ ADC_CHANNEL_IN5, 1 };
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case C5: return (pin_and_adc){ ADC_CHANNEL_IN11, 1 };
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case D8: return (pin_and_adc){ ADC_CHANNEL_IN12, 3 };
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case D9: return (pin_and_adc){ ADC_CHANNEL_IN13, 3 };
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case D10: return (pin_and_adc){ ADC_CHANNEL_IN7, 2 }; // Can also be ADC4
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case D11: return (pin_and_adc){ ADC_CHANNEL_IN8, 2 }; // Can also be ADC4
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case D12: return (pin_and_adc){ ADC_CHANNEL_IN9, 2 }; // Can also be ADC4
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case D13: return (pin_and_adc){ ADC_CHANNEL_IN10, 2 }; // Can also be ADC4
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case D14: return (pin_and_adc){ ADC_CHANNEL_IN11, 2 }; // Can also be ADC4
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case E7: return (pin_and_adc){ ADC_CHANNEL_IN13, 2 };
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case E8: return (pin_and_adc){ ADC_CHANNEL_IN6, 2 }; // Can also be ADC4
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case E9: return (pin_and_adc){ ADC_CHANNEL_IN2, 2 };
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case E10: return (pin_and_adc){ ADC_CHANNEL_IN14, 2 };
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case E11: return (pin_and_adc){ ADC_CHANNEL_IN15, 2 };
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case E12: return (pin_and_adc){ ADC_CHANNEL_IN16, 2 };
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case E13: return (pin_and_adc){ ADC_CHANNEL_IN3, 2 };
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case E14: return (pin_and_adc){ ADC_CHANNEL_IN1, 3 };
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case E15: return (pin_and_adc){ ADC_CHANNEL_IN2, 3 };
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case F2: return (pin_and_adc){ ADC_CHANNEL_IN10, 0 }; // Can also be ADC2
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case F4: return (pin_and_adc){ ADC_CHANNEL_IN5, 0 };
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#else
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#error "An ADC pin-to-mux configuration has not been specified for this microcontroller."
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#endif
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default: return (pin_and_adc){ 0, 0 };
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// clang-format on
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}
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}
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adcsample_t analogReadPin(pin_t pin) { return adc_read(pinToMux(pin)); }
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adcsample_t analogReadPinAdc(pin_t pin, uint8_t adc) {
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pin_and_adc target = pinToMux(pin);
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target.adc = adc;
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return adc_read(target);
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}
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adcsample_t adc_read(pin_and_adc mux) {
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#if defined(STM32F0XX)
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adcConversionGroup.sqr = ADC_CHSELR_CHSEL1;
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#elif defined(STM32F3XX)
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adcConversionGroup.sqr[0] = ADC_SQR1_SQ1_N(mux.pin);
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#else
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# error "adc_read has not been updated to support this ARM microcontroller."
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#endif
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ADCDriver* targetDriver = intToADCDriver(mux.adc);
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manageAdcInitializationDriver(mux.adc, targetDriver);
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adcConvert(targetDriver, &adcConversionGroup, &sampleBuffer[0], ADC_BUFFER_DEPTH);
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adcsample_t* result = sampleBuffer;
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return *result;
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}
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