55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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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 3 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 <https://www.gnu.org/licenses/>.
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*
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*/
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#include "../inc/MarlinConfig.h"
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#if ENABLED(I2C_AMMETER)
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#include "ammeter.h"
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#ifndef I2C_AMMETER_IMAX
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#define I2C_AMMETER_IMAX 0.500 // Calibration range 500 Milliamps
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#endif
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INA226 ina;
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Ammeter ammeter;
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float Ammeter::scale;
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float Ammeter::current;
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void Ammeter::init() {
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ina.begin();
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ina.configure(INA226_AVERAGES_16, INA226_BUS_CONV_TIME_1100US, INA226_SHUNT_CONV_TIME_1100US, INA226_MODE_SHUNT_BUS_CONT);
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ina.calibrate(I2C_AMMETER_SHUNT_RESISTOR, I2C_AMMETER_IMAX);
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}
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float Ammeter::read() {
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scale = 1;
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current = ina.readShuntCurrent();
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if (current <= 0.0001f) current = 0; // Clean up least-significant-bit amplification errors
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if (current < 0.1f) scale = 1000;
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return current * scale;
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}
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#endif // I2C_AMMETER
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