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ADC.h
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ADC.h
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/* Teensy 4, 3.x, LC ADC library
* https://github.com/pedvide/ADC
* Copyright (c) 2019 Pedro Villanueva
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* TODO
* - Function to measure more that 1 pin consecutively (stream?)
*
* bugs:
* - comparison values in 16 bit differential mode are twice what they should be
*/
/*! \mainpage ADC
Teensy 4, 3.x, LC ADC library
This manual is divided in the following sections:
- \subpage adc_doc "ADC"
- \subpage adc_module "ADC Module"
- \subpage settings "Board settings"
- \subpage error "ADC error codes"
- \subpage util "ADC util"
*/
/*! \page adc_doc ADC
Make Analog to Digital conversions using the ADC interface.
See the ADC class for all methods.
*/
#ifndef ADC_H
#define ADC_H
#define ADC_0 0
#define ADC_1 1
//enum class ADC_NUM {ADC_0, ADC_1}; // too verbose, but it'd avoid some mistakes
// include ADC module class
#include "ADC_Module.h"
#ifdef __cplusplus
extern "C" {
#endif
/** Class ADC: Controls the Teensy 3.x, 4 ADC
*
*/
class ADC
{
protected:
private:
// ADCs objects
ADC_Module adc0_obj;
#ifdef ADC_DUAL_ADCS
ADC_Module adc1_obj;
#endif
//! Number of ADC objects
const uint8_t num_ADCs = ADC_NUM_ADCS;
public:
/** Default constructor */
ADC();
// create both adc objects
//! Object to control the ADC0
ADC_Module *const adc0 = &adc0_obj; // adc object pointer
#ifdef ADC_DUAL_ADCS
//! Object to control the ADC1
ADC_Module *const adc1 = &adc1_obj; // adc object pointer
#endif
#ifdef ADC_SINGLE_ADC
//! Array with the ADC Modules
ADC_Module *const adc[ADC_NUM_ADCS] = {adc0};
#else
//! Array with the ADC Modules
ADC_Module *const adc[ADC_NUM_ADCS] = {adc0, adc1};
#endif
/////////////// METHODS TO SET/GET SETTINGS OF THE ADC ////////////////////
//! Set the voltage reference you prefer, default is vcc
/*! It recalibrates at the end.
* \param type can be ADC_REFERENCE::REF_3V3, ADC_REFERENCE::REF_1V2 (not for Teensy LC) or ADC_REFERENCE::REF_EXT
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->setReference instead")))
void setReference(ADC_REFERENCE type, int8_t adc_num = -1);
//! Change the resolution of the measurement.
/*!
* \param bits is the number of bits of resolution.
* For single-ended measurements: 8, 10, 12 or 16 bits.
* For differential measurements: 9, 11, 13 or 16 bits.
* If you want something in between (11 bits single-ended for example) select the immediate higher
* and shift the result one to the right.
* Whenever you change the resolution, change also the comparison values (if you use them).
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->setResolution instead")))
void setResolution(uint8_t bits, int8_t adc_num = -1);
//! Returns the resolution of the ADC_Module.
/**
* \param adc_num ADC number to query.
* \return the resolution of adc_num ADC.
*/
__attribute__((error("Use adc->adcX->getResolution instead")))
uint8_t getResolution(int8_t adc_num = -1);
//! Returns the maximum value for a measurement: 2^res-1.
/**
* \param adc_num ADC number to query.
* \return the maximum value of adc_num ADC.
*/
__attribute__((error("Use adc->adcX->getMaxValue instead")))
uint32_t getMaxValue(int8_t adc_num = -1);
//! Sets the conversion speed (changes the ADC clock, ADCK)
/**
* \param speed can be any from the ADC_CONVERSION_SPEED enum: VERY_LOW_SPEED, LOW_SPEED, MED_SPEED, HIGH_SPEED_16BITS, HIGH_SPEED, VERY_HIGH_SPEED,
* ADACK_2_4, ADACK_4_0, ADACK_5_2 or ADACK_6_2.
*
* VERY_LOW_SPEED is guaranteed to be the lowest possible speed within specs for resolutions less than 16 bits (higher than 1 MHz),
* it's different from LOW_SPEED only for 24, 4 or 2 MHz bus frequency.
* LOW_SPEED is guaranteed to be the lowest possible speed within specs for all resolutions (higher than 2 MHz).
* MED_SPEED is always >= LOW_SPEED and <= HIGH_SPEED.
* HIGH_SPEED_16BITS is guaranteed to be the highest possible speed within specs for all resolutions (lower or eq than 12 MHz).
* HIGH_SPEED is guaranteed to be the highest possible speed within specs for resolutions less than 16 bits (lower or eq than 18 MHz).
* VERY_HIGH_SPEED may be out of specs, it's different from HIGH_SPEED only for 48, 40 or 24 MHz bus frequency.
*
* Additionally the conversion speed can also be ADACK_2_4, ADACK_4_0, ADACK_5_2 and ADACK_6_2,
* where the numbers are the frequency of the ADC clock (ADCK) in MHz and are independent on the bus speed.
* This is useful if you are using the Teensy at a very low clock frequency but want faster conversions,
* but if F_BUS<F_ADCK, you can't use VERY_HIGH_SPEED for sampling speed.
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->setConversionSpeed instead")))
void setConversionSpeed(ADC_CONVERSION_SPEED speed, int8_t adc_num = -1);
//! Sets the sampling speed
/** Increase the sampling speed for low impedance sources, decrease it for higher impedance ones.
* \param speed can be any of the ADC_SAMPLING_SPEED enum: VERY_LOW_SPEED, LOW_SPEED, MED_SPEED, HIGH_SPEED or VERY_HIGH_SPEED.
*
* VERY_LOW_SPEED is the lowest possible sampling speed (+24 ADCK).
* LOW_SPEED adds +16 ADCK.
* MED_SPEED adds +10 ADCK.
* HIGH_SPEED adds +6 ADCK.
* VERY_HIGH_SPEED is the highest possible sampling speed (0 ADCK added).
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->setSamplingSpeed instead")))
void setSamplingSpeed(ADC_SAMPLING_SPEED speed, int8_t adc_num = -1);
//! Set the number of averages
/*!
* \param num can be 0, 4, 8, 16 or 32.
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->setAveraging instead")))
void setAveraging(uint8_t num, int8_t adc_num = -1);
//! Enable interrupts
/** An IRQ_ADCx Interrupt will be raised when the conversion is completed
* (including hardware averages and if the comparison (if any) is true).
* \param adc_num ADC number to change.
* \param isr function (returns void and accepts no arguments) that will be executed after an interrupt.
* \param priority Interrupt priority, highest is 0, lowest is 255.
*/
__attribute__((error("Use adc->adcX->enableInterrupts instead")))
void enableInterrupts(void (*isr)(void), uint8_t priority=255, int8_t adc_num = -1);
//! Disable interrupts
/**
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->disableInterrupts instead")))
void disableInterrupts(int8_t adc_num = -1);
#ifdef ADC_USE_DMA
//! Enable DMA request
/** An ADC DMA request will be raised when the conversion is completed
* (including hardware averages and if the comparison (if any) is true).
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->enableDMA instead")))
void enableDMA(int8_t adc_num = -1);
//! Disable ADC DMA request
/**
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->disableDMA instead")))
void disableDMA(int8_t adc_num = -1);
#endif
//! Enable the compare function to a single value
/** A conversion will be completed only when the ADC value
* is >= compValue (greaterThan=1) or < compValue (greaterThan=0)
* Call it after changing the resolution
* Use with interrupts or poll conversion completion with isComplete()
* \param compValue value to compare
* \param greaterThan true or false
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->enableCompare instead")))
void enableCompare(int16_t compValue, bool greaterThan, int8_t adc_num = -1);
//! Enable the compare function to a range
/** A conversion will be completed only when the ADC value is inside (insideRange=1) or outside (=0)
* the range given by (lowerLimit, upperLimit),including (inclusive=1) the limits or not (inclusive=0).
* See Table 31-78, p. 617 of the freescale manual.
* Call it after changing the resolution
* Use with interrupts or poll conversion completion with isComplete()
* \param lowerLimit lower value to compare
* \param upperLimit upper value to compare
* \param insideRange true or false
* \param inclusive true or false
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->enableCompareRange instead")))
void enableCompareRange(int16_t lowerLimit, int16_t upperLimit, bool insideRange, bool inclusive, int8_t adc_num = -1);
//! Disable the compare function
/**
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->disableCompare instead")))
void disableCompare(int8_t adc_num = -1);
#ifdef ADC_USE_PGA
//! Enable and set PGA
/** Enables the PGA and sets the gain
* Use only for signals lower than 1.2 V and only in differential mode
* \param gain can be 1, 2, 4, 8, 16, 32 or 64
* \param adc_num ADC number to change.
*/
__attribute__((error("Use adc->adcX->enablePGA instead")))
void enablePGA(uint8_t gain, int8_t adc_num = -1);
//! Returns the PGA level
/** PGA level = from 1 to 64
* \param adc_num ADC number to query.
* \return PGA level = from 1 to 64
*/
__attribute__((error("Use adc->adcX->getPGA instead")))
uint8_t getPGA(int8_t adc_num = -1);
//! Disable PGA
/**
* \param adc_num ADC number to query
*/
__attribute__((error("Use adc->adcX->disablePGA instead")))
void disablePGA(int8_t adc_num = -1);
#endif
////////////// INFORMATION ABOUT THE STATE OF THE ADC /////////////////
//! Is the ADC converting at the moment?
/**
* \param adc_num ADC number to query
* \return true if yes, false if not.
*/
__attribute__((error("Use adc->adcX->isConverting instead")))
bool isConverting(int8_t adc_num = -1);
//! Is an ADC conversion ready?
/** When a value is read this function returns 0 until a new value exists
* So it only makes sense to call it with continuous or non-blocking methods
* \param adc_num ADC number to query
* \return true if yes, false if not.
*/
__attribute__((error("Use adc->adcX->isComplete instead")))
bool isComplete(int8_t adc_num = -1);
#if ADC_DIFF_PAIRS > 0
//! Is the ADC in differential mode?
/**
* \param adc_num ADC number to query
* \return true or false
*/
__attribute__((error("Use adc->adcX->isDifferential instead")))
bool isDifferential(int8_t adc_num = -1);
#endif
//! Is the ADC in continuous mode?
/**
* \param adc_num ADC number to query
* \return true or false
*/
__attribute__((error("Use adc->adcX->isContinuous instead")))
bool isContinuous(int8_t adc_num = -1);
//////////////// BLOCKING CONVERSION METHODS //////////////////
//! Returns the analog value of the pin.
/** It waits until the value is read and then returns the result.
* If a comparison has been set up and fails, it will return ADC_ERROR_VALUE.
* This function is interrupt safe, so it will restore the adc to the state it was before being called
* If more than one ADC exists, it will select the module with less workload, you can force a selection using
* adc_num. If you select ADC1 in Teensy 3.0 it will return ADC_ERROR_VALUE.
* \param pin can be any of the analog pins
* \param adc_num ADC_X ADC module
* \return the value of the pin.
*/
int analogRead(uint8_t pin, int8_t adc_num = -1);
//! Returns the analog value of the special internal source, such as the temperature sensor.
/** It calls analogRead(uint8_t pin) internally, with the correct value for the pin for all boards.
* Possible values:
* TEMP_SENSOR, Temperature sensor.
* VREF_OUT, 1.2 V reference (switch on first using VREF.h).
* BANDGAP, BANDGAP (switch on first using VREF.h).
* VREFH, High VREF.
* VREFL, Low VREF.
* \param pin ADC_INTERNAL_SOURCE to read.
* \param adc_num ADC_X ADC module
* \return the value of the pin.
*/
int analogRead(ADC_INTERNAL_SOURCE pin, int8_t adc_num = -1) __attribute__((always_inline)) {
return analogRead(static_cast<uint8_t>(pin), adc_num);
}
#if ADC_DIFF_PAIRS > 0
//! Reads the differential analog value of two pins (pinP - pinN).
/** It waits until the value is read and then returns the result.
* This function is interrupt safe, so it will restore the adc to the state it was before being called
* If more than one ADC exists, it will select the module with less workload, you can force a selection using
* adc_num
* \param pinP must be A10 or A12.
* \param pinN must be A11 (if pinP=A10) or A13 (if pinP=A12).
* \param adc_num ADC_X ADC module
* \return the differential value of the pins, invalid pins return ADC_ERROR_VALUE.
* If a comparison has been set up and fails, it will return ADC_ERROR_VALUE.
*/
int analogReadDifferential(uint8_t pinP, uint8_t pinN, int8_t adc_num = -1);
#endif
/////////////// NON-BLOCKING CONVERSION METHODS //////////////
//! Starts an analog measurement on the pin and enables interrupts.
/** It returns immediately, get value with readSingle().
* If this function interrupts a measurement, it stores the settings in adc_config
* \param pin can be any of the analog pins
* \param adc_num ADC_X ADC module
* \return true if the pin is valid, false otherwise.
*/
bool startSingleRead(uint8_t pin, int8_t adc_num = -1);
#if ADC_DIFF_PAIRS > 0
//! Start a differential conversion between two pins (pinP - pinN) and enables interrupts.
/** It returns immediately, get value with readSingle().
* If this function interrupts a measurement, it stores the settings in adc_config
* \param pinP must be A10 or A12.
* \param pinN must be A11 (if pinP=A10) or A13 (if pinP=A12).
* \param adc_num ADC_X ADC module
* \return true if the pins are valid, false otherwise.
*/
bool startSingleDifferential(uint8_t pinP, uint8_t pinN, int8_t adc_num = -1);
#endif
//! Reads the analog value of a single conversion.
/** Set the conversion with with startSingleRead(pin) or startSingleDifferential(pinP, pinN).
* \param adc_num ADC_X ADC module
* \return the converted value.
*/
int readSingle(int8_t adc_num = -1);
///////////// CONTINUOUS CONVERSION METHODS ////////////
//! Starts continuous conversion on the pin.
/** It returns as soon as the ADC is set, use analogReadContinuous() to read the value.
* \param pin can be any of the analog pins
* \param adc_num ADC_X ADC module
* \return true if the pin is valid, false otherwise.
*/
bool startContinuous(uint8_t pin, int8_t adc_num = -1);
#if ADC_DIFF_PAIRS > 0
//! Starts continuous conversion between the pins (pinP-pinN).
/** It returns as soon as the ADC is set, use analogReadContinuous() to read the value.
* \param pinP must be A10 or A12.
* \param pinN must be A11 (if pinP=A10) or A13 (if pinP=A12).
* \param adc_num ADC_X ADC module
* \return true if the pins are valid, false otherwise.
*/
bool startContinuousDifferential(uint8_t pinP, uint8_t pinN, int8_t adc_num = -1);
#endif
//! Reads the analog value of a continuous conversion.
/** Set the continuous conversion with with analogStartContinuous(pin) or startContinuousDifferential(pinP, pinN).
* If single-ended and 16 bits it's necessary to typecast it to an unsigned type (like uint16_t),
* otherwise values larger than 3.3/2 V are interpreted as negative!
* \param adc_num ADC_X ADC module
* \return the last converted value.
*/
int analogReadContinuous(int8_t adc_num = -1);
//! Stops continuous conversion
/**
* \param adc_num ADC_X ADC module
*/
void stopContinuous(int8_t adc_num = -1);
/////////// SYNCHRONIZED METHODS ///////////////
///// ONLY FOR BOARDS WITH MORE THAN ONE ADC /////
#ifdef ADC_DUAL_ADCS
//! Struct for synchronous measurements
/** result_adc0 has the result from ADC0 and result_adc1 from ADC1.
*/
struct Sync_result{
int32_t result_adc0, result_adc1;
};
//////////////// SYNCHRONIZED BLOCKING METHODS //////////////////
//! Returns the analog values of both pins, measured at the same time by the two ADC modules.
/** It waits until the values are read and then returns the result as a struct Sync_result,
* use Sync_result.result_adc0 and Sync_result.result_adc1.
* If a comparison has been set up and fails, it will return ADC_ERROR_VALUE in both fields of the struct.
* This function is interrupt safe, so it will restore the adc to the state it was before being called
* \param pin0 pin in ADC0
* \param pin1 pin in ADC1
* \return a Sync_result struct with the result of each ADC value.
*/
Sync_result analogSynchronizedRead(uint8_t pin0, uint8_t pin1);
//! Same as analogSynchronizedRead
/**
* \param pin0 pin in ADC0
* \param pin1 pin in ADC1
* \return a Sync_result struct with the result of each ADC value.
*/
Sync_result analogSyncRead(uint8_t pin0, uint8_t pin1) __attribute__((always_inline)) {return analogSynchronizedRead(pin0, pin1);}
#if ADC_DIFF_PAIRS > 0
//! Returns the differential analog values of both sets of pins, measured at the same time by the two ADC modules.
/** It waits until the values are read and then returns the result as a struct Sync_result,
* use Sync_result.result_adc0 and Sync_result.result_adc1.
* If a comparison has been set up and fails, it will return ADC_ERROR_VALUE in both fields of the struct.
* This function is interrupt safe, so it will restore the adc to the state it was before being called
* \param pin0P positive pin in ADC0
* \param pin0N negative pin in ADC0
* \param pin1P positive pin in ADC1
* \param pin1N negative pin in ADC1
* \return a Sync_result struct with the result of each differential ADC value.
*/
Sync_result analogSynchronizedReadDifferential(uint8_t pin0P, uint8_t pin0N, uint8_t pin1P, uint8_t pin1N);
//! Same as analogSynchronizedReadDifferential
/**
* \param pin0P positive pin in ADC0
* \param pin0N negative pin in ADC0
* \param pin1P positive pin in ADC1
* \param pin1N negative pin in ADC1
* \return a Sync_result struct with the result of each differential ADC value.
*/
Sync_result analogSyncReadDifferential(uint8_t pin0P, uint8_t pin0N, uint8_t pin1P, uint8_t pin1N) __attribute__((always_inline)) {
return analogSynchronizedReadDifferential(pin0P, pin0N, pin1P, pin1N);
}
#endif
/////////////// SYNCHRONIZED NON-BLOCKING METHODS //////////////
//! Starts an analog measurement at the same time on the two ADC modules
/** It returns immediately, get value with readSynchronizedSingle().
* If this function interrupts a measurement, it stores the settings in adc_config
* \param pin0 pin in ADC0
* \param pin1 pin in ADC1
* \return true if the pins are valid, false otherwise.
*/
bool startSynchronizedSingleRead(uint8_t pin0, uint8_t pin1);
#if ADC_DIFF_PAIRS > 0
//! Start a differential conversion between two pins (pin0P - pin0N) and (pin1P - pin1N)
/** It returns immediately, get value with readSynchronizedSingle().
* If this function interrupts a measurement, it stores the settings in adc_config
* \param pin0P positive pin in ADC0
* \param pin0N negative pin in ADC0
* \param pin1P positive pin in ADC1
* \param pin1N negative pin in ADC1
* \return true if the pins are valid, false otherwise.
*/
bool startSynchronizedSingleDifferential(uint8_t pin0P, uint8_t pin0N, uint8_t pin1P, uint8_t pin1N);
#endif
//! Reads the analog value of a single conversion.
/**
* \return the converted value.
*/
Sync_result readSynchronizedSingle();
///////////// SYNCHRONIZED CONTINUOUS CONVERSION METHODS ////////////
//! Starts a continuous conversion in both ADCs simultaneously
/** Use readSynchronizedContinuous to get the values
* \param pin0 pin in ADC0
* \param pin1 pin in ADC1
* \return true if the pins are valid, false otherwise.
*/
bool startSynchronizedContinuous(uint8_t pin0, uint8_t pin1);
#if ADC_DIFF_PAIRS > 0
//! Starts a continuous differential conversion in both ADCs simultaneously
/** Use readSynchronizedContinuous to get the values
* \param pin0P positive pin in ADC0
* \param pin0N negative pin in ADC0
* \param pin1P positive pin in ADC1
* \param pin1N negative pin in ADC1
* \return true if the pins are valid, false otherwise.
*/
bool startSynchronizedContinuousDifferential(uint8_t pin0P, uint8_t pin0N, uint8_t pin1P, uint8_t pin1N);
#endif
//! Returns the values of both ADCs.
/**
* \return the converted value.
*/
Sync_result readSynchronizedContinuous();
//! Stops synchronous continuous conversion
void stopSynchronizedContinuous();
#endif
//////////// ERRORS /////
//! Resets all errors from all ADCs, if any.
void resetError() {
for(int i=0; i< ADC_NUM_ADCS; i++) {
adc[i]->resetError();
}
}
//! Translate pin number to SC1A nomenclature
// should this be a constexpr?
static const uint8_t channel2sc1aADC0[ADC_MAX_PIN+1];
#ifdef ADC_DUAL_ADCS
//! Translate pin number to SC1A nomenclature
static const uint8_t channel2sc1aADC1[ADC_MAX_PIN+1];
#endif
//! Translate pin number to SC1A nomenclature for differential pins
static const uint8_t sc1a2channelADC0[ADC_MAX_PIN+1];
#ifdef ADC_DUAL_ADCS
//! Translate pin number to SC1A nomenclature for differential pins
static const uint8_t sc1a2channelADC1[ADC_MAX_PIN+1];
#endif
#if ADC_DIFF_PAIRS > 0
//! Translate differential pin number to SC1A nomenclature
static const ADC_Module::ADC_NLIST diff_table_ADC0[ADC_DIFF_PAIRS];
#ifdef ADC_DUAL_ADCS
//! Translate differential pin number to SC1A nomenclature
static const ADC_Module::ADC_NLIST diff_table_ADC1[ADC_DIFF_PAIRS];
#endif
#endif
};
#ifdef __cplusplus
}
#endif
#endif // ADC_H