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63 lines
2.2 KiB
63 lines
2.2 KiB
/**
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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(HAS_MCP3426_ADC)
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#include "../../gcode.h"
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#include "../../../feature/adc/adc_mcp3426.h"
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/**
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* M3426: Read 16 bit (signed) value from I2C MCP3426 ADC device
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*
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* M3426 C<byte-1 value in base 10> channel 1 or 2
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* M3426 G<byte-1 value in base 10> gain 1, 2, 4 or 8
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* M3426 I<byte-2 value in base 10> 0 or 1, invert reply
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*/
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void GcodeSuite::M3426() {
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uint8_t channel = parser.byteval('C', 1), // Select the channel 1 or 2
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gain = parser.byteval('G', 1);
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const bool inverted = parser.byteval('I') == 1;
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if (channel <= 2 && (gain == 1 || gain == 2 || gain == 4 || gain == 8)) {
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int16_t result = mcp3426.ReadValue(channel, gain);
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if (mcp3426.Error == false) {
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if (inverted) {
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// Should we invert the reading (32767 - ADC value) ?
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// Caters to end devices that expect values to increase when in reality they decrease.
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// e.g., A pressure sensor in a vacuum when the end device expects a positive pressure.
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result = INT16_MAX - result;
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}
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//SERIAL_ECHOPGM(STR_OK);
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SERIAL_ECHOLNPGM("V:", result, " C:", channel, " G:", gain, " I:", inverted ? 1 : 0);
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}
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else
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SERIAL_ERROR_MSG("MCP342X i2c error");
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}
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else
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SERIAL_ERROR_MSG("MCP342X Bad request");
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}
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#endif // HAS_MCP3426_ADC
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