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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
- #include "../inc/MarlinConfig.h"
-
- #if ENABLED(I2C_AMMETER)
-
- #include "ammeter.h"
-
- #ifndef I2C_AMMETER_IMAX
- #define I2C_AMMETER_IMAX 0.500 // Calibration range 500 Milliamps
- #endif
-
- INA226 ina;
-
- Ammeter ammeter;
-
- float Ammeter::scale;
- float Ammeter::current;
-
- void Ammeter::init() {
- ina.begin();
- ina.configure(INA226_AVERAGES_16, INA226_BUS_CONV_TIME_1100US, INA226_SHUNT_CONV_TIME_1100US, INA226_MODE_SHUNT_BUS_CONT);
- ina.calibrate(I2C_AMMETER_SHUNT_RESISTOR, I2C_AMMETER_IMAX);
- }
-
- float Ammeter::read() {
- scale = 1;
- current = ina.readShuntCurrent();
- if (current <= 0.0001f) current = 0; // Clean up least-significant-bit amplification errors
- if (current < 0.1f) scale = 1000;
- return current * scale;
- }
-
- #endif // I2C_AMMETER
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