146 lines
3.5 KiB
C++
146 lines
3.5 KiB
C++
/*
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wiring_analog.cpp - analog input and output functions
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Part of Arduino - http://www.arduino.cc/
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Copyright (c) 2018-2019 Arduino SA
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General
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Public License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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Boston, MA 02111-1307 USA
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*/
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#include "Arduino.h"
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#include "pins_arduino.h"
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#include "pinDefinitions.h"
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static int write_resolution = 8;
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static int read_resolution = 10;
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#if DEVICE_ANALOGOUT
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#include "drivers/AnalogOut.h"
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mbed::AnalogOut* dac[NUM_ANALOG_OUTPUTS] = { NULL };
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void analogWriteDAC(PinName pin, int val, int idx) {
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if (dac[idx] == NULL) {
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dac[idx] = new mbed::AnalogOut(pin);
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}
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float percent = (float)val/(float)((1 << write_resolution)-1);
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if (percent > 1.0f) {
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percent = 1.0f;
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}
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dac[idx]->write(percent);
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}
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#endif
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void analogWrite(PinName pin, int val)
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{
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pin_size_t idx = PinNameToIndex(pin);
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if (idx != NOT_A_PIN) {
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analogWrite(idx, val);
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} else {
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mbed::PwmOut* pwm = new mbed::PwmOut(pin);
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pwm->period_ms(2); //500Hz
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float percent = (float)val/(float)((1 << write_resolution)-1);
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pwm->write(percent);
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}
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}
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void analogWrite(pin_size_t pin, int val)
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{
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if (pin >= PINS_COUNT) {
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return;
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}
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#ifdef DAC
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for (unsigned int i=0; i<NUM_ANALOG_OUTPUTS; i++) {
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if (digitalPinToPinName(pin) == g_AAnalogOutPinDescription[i].name) {
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analogWriteDAC(digitalPinToPinName(pin), val, i);
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return;
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}
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}
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#endif
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float percent = (float)val/(float)((1 << write_resolution)-1);
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mbed::PwmOut* pwm = digitalPinToPwm(pin);
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if (pwm == NULL) {
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pwm = new mbed::PwmOut(digitalPinToPinName(pin));
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digitalPinToPwm(pin) = pwm;
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pwm->period_ms(2); //500Hz
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}
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if (percent < 0) {
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delete pwm;
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digitalPinToPwm(pin) = NULL;
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} else {
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pwm->write(percent);
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}
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}
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void analogWriteResolution(int bits)
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{
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write_resolution = bits;
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}
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int analogRead(PinName pin)
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{
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for (pin_size_t i = 0; i < NUM_ANALOG_INPUTS; i++) {
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if (analogPinToPinName(i) == pin) {
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return analogRead(i + A0);
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}
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}
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return -1;
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}
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int analogRead(pin_size_t pin)
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{
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if (pin >= PINS_COUNT) {
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return -1;
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}
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PinName name = analogPinToPinName(pin);
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if (name == NC) {
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return -1;
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}
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mbed::AnalogIn* adc = analogPinToAdcObj(pin);
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if (adc == NULL) {
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adc = new mbed::AnalogIn(name);
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analogPinToAdcObj(pin) = adc;
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#ifdef ANALOG_CONFIG
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if (isAdcConfigChanged) {
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adc->configure(adcCurrentConfig);
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}
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#endif
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}
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return (adc->read_u16() >> (16 - read_resolution));
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}
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#ifdef ANALOG_CONFIG
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/* Spot all active ADCs to reconfigure them */
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void analogUpdate()
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{
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isAdcConfigChanged = true;
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//for (pin_size_t i = A0; i < A0 + NUM_ANALOG_INPUTS; i++) { //also the other works
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for (pin_size_t i = 0; i < NUM_ANALOG_INPUTS; i++) {
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if (analogPinToAdcObj(i) != NULL) {
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analogPinToAdcObj(i)->configure(adcCurrentConfig);
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}
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}
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}
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#endif
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void analogReadResolution(int bits)
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{
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read_resolution = bits;
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}
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int getAnalogReadResolution()
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{
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return read_resolution;
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}
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