Katelyn Schiesser
3 years ago
committed by
Scott Lahteine
Scott Lahteine
49 changed files with 1563 additions and 783 deletions
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/**
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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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/**
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* Based on Based on Adafruit MAX31865 library: |
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* |
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* This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865 |
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* Designed specifically to work with the Adafruit RTD Sensor |
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* https://www.adafruit.com/products/3328
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* |
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* This sensor uses SPI to communicate, 4 pins are required to interface. |
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* |
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* Adafruit invests time and resources providing this open source code, |
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* please support Adafruit and open-source hardware by purchasing |
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* products from Adafruit! |
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* |
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* Written by Limor Fried/Ladyada for Adafruit Industries. |
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* |
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* Modifications by JoAnn Manges (@GadgetAngel) |
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* Copyright (c) 2020, JoAnn Manges |
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* All rights reserved. |
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*/ |
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// Useful for RTD debugging.
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//#define MAX31865_DEBUG
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//#define MAX31865_DEBUG_SPI
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//TODO: switch to SPIclass/SoftSPI
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#include "../inc/MarlinConfig.h" |
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#if HAS_MAX31865 && !LIB_USR_MAX31865 |
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#include "MAX31865.h" |
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// The maximum speed the MAX31865 can do is 5 MHz
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SPISettings MAX31865::spiConfig = SPISettings( |
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#if defined(TARGET_LPC1768) |
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SPI_QUARTER_SPEED |
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#elif defined(ARDUINO_ARCH_STM32) |
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SPI_CLOCK_DIV4 |
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#else |
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500000 |
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#endif |
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, MSBFIRST |
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, SPI_MODE_1 // CPOL0 CPHA1
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); |
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#ifndef LARGE_PINMAP |
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/**
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* Create the interface object using software (bitbang) SPI for PIN values |
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* less than or equal to 127. |
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* |
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* @param spi_cs the SPI CS pin to use |
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* @param spi_mosi the SPI MOSI pin to use |
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* @param spi_miso the SPI MISO pin to use |
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* @param spi_clk the SPI clock pin to use |
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*/ |
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MAX31865::MAX31865(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, int8_t spi_clk) { |
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_cs = spi_cs; |
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_mosi = spi_mosi; |
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_miso = spi_miso; |
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_sclk = spi_clk; |
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} |
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/**
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* Create the interface object using hardware SPI for PIN for PIN values less |
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* than or equal to 127. |
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* |
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* @param spi_cs the SPI CS pin to use along with the default SPI device |
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*/ |
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MAX31865::MAX31865(int8_t spi_cs) { |
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_cs = spi_cs; |
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_sclk = _miso = _mosi = -1; |
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} |
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#else |
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/**
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* Create the interface object using software (bitbang) SPI for PIN values |
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* which are larger than 127. If you have PIN values less than or equal to |
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* 127 use the other call for SW SPI. |
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* |
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* @param spi_cs the SPI CS pin to use |
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* @param spi_mosi the SPI MOSI pin to use |
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* @param spi_miso the SPI MISO pin to use |
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* @param spi_clk the SPI clock pin to use |
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* @param pin_mapping set to 1 for positive pin values |
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*/ |
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MAX31865::MAX31865(uint32_t spi_cs, uint32_t spi_mosi, |
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uint32_t spi_miso, uint32_t spi_clk, |
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uint8_t pin_mapping) { |
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_cs = spi_cs; |
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_mosi = spi_mosi; |
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_miso = spi_miso; |
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_sclk = spi_clk; |
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} |
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/**
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* Create the interface object using hardware SPI for PIN values which are |
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* larger than 127. If you have PIN values less than or equal to 127 use |
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* the other call for HW SPI. |
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* |
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* @param spi_cs the SPI CS pin to use along with the default SPI device |
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* @param pin_mapping set to 1 for positive pin values |
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*/ |
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MAX31865::MAX31865(uint32_t spi_cs, uint8_t pin_mapping) { |
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_cs = spi_cs; |
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_sclk = _miso = _mosi = -1UL; //-1UL or 0xFFFFFFFF or 4294967295
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} |
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#endif // LARGE_PINMAP
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/**
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* |
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* Instance & Class methods |
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* |
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*/ |
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/**
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* Initialize the SPI interface and set the number of RTD wires used |
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* |
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* @param wires The number of wires in enum format. Can be MAX31865_2WIRE, MAX31865_3WIRE, or MAX31865_4WIRE. |
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* @param zero The resistance of the RTD at 0 degC, in ohms. |
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* @param ref The resistance of the reference resistor, in ohms. |
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*/ |
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void MAX31865::begin(max31865_numwires_t wires, float zero, float ref) { |
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Rzero = zero; |
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Rref = ref; |
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OUT_WRITE(_cs, HIGH); |
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if (_sclk != TERN(LARGE_PINMAP, -1UL, -1)) { |
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// define pin modes for Software SPI
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#ifdef MAX31865_DEBUG |
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SERIAL_ECHOLN("Initializing MAX31865 Software SPI"); |
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#endif |
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OUT_WRITE(_sclk, LOW); |
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SET_OUTPUT(_mosi); |
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SET_INPUT(_miso); |
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} else { |
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// start and configure hardware SPI
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#ifdef MAX31865_DEBUG |
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SERIAL_ECHOLN("Initializing MAX31865 Hardware SPI"); |
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#endif |
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SPI.begin(); |
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} |
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setWires(wires); |
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enableBias(false); |
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autoConvert(false); |
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clearFault(); |
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#ifdef MAX31865_DEBUG_SPI |
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#ifndef LARGE_PINMAP |
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SERIAL_ECHOLNPAIR( |
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"Regular begin call with _cs: ", _cs, |
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" _miso: ", _miso, |
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" _sclk: ", _sclk, |
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" _mosi: ", _mosi |
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); |
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#else |
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SERIAL_ECHOLNPAIR( |
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"LARGE_PINMAP begin call with _cs: ", _cs, |
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" _miso: ", _miso, |
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" _sclk: ", _sclk, |
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" _mosi: ", _mosi |
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); |
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#endif // LARGE_PINMAP
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SERIAL_ECHOLNPAIR("config: ", readRegister8(MAX31856_CONFIG_REG)); |
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SERIAL_EOL(); |
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#endif // MAX31865_DEBUG_SPI
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} |
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/**
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* Read the raw 8-bit FAULTSTAT register |
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* |
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* @return The raw unsigned 8-bit FAULT status register |
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*/ |
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uint8_t MAX31865::readFault() { |
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return readRegister8(MAX31856_FAULTSTAT_REG); |
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} |
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/**
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* Clear all faults in FAULTSTAT. |
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*/ |
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void MAX31865::clearFault() { |
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setConfig(MAX31856_CONFIG_FAULTSTAT, 1); |
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} |
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/**
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* Whether we want to have continuous conversions (50/60 Hz) |
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* |
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* @param b If true, auto conversion is enabled |
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*/ |
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void MAX31865::autoConvert(bool b) { |
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setConfig(MAX31856_CONFIG_MODEAUTO, b); |
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} |
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/**
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* Whether we want filter out 50Hz noise or 60Hz noise |
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* |
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* @param b If true, 50Hz noise is filtered, else 60Hz(default) |
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*/ |
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void MAX31865::enable50HzFilter(bool b) { |
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setConfig(MAX31856_CONFIG_FILT50HZ, b); |
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} |
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/**
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* Enable the bias voltage on the RTD sensor |
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* |
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* @param b If true bias is enabled, else disabled |
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*/ |
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void MAX31865::enableBias(bool b) { |
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setConfig(MAX31856_CONFIG_BIAS, b); |
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// From the datasheet:
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// Note that if VBIAS is off (to reduce supply current between conversions), any filter
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// capacitors at the RTDIN inputs need to charge before an accurate conversion can be
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// performed. Therefore, enable VBIAS and wait at least 10.5 time constants of the input
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// RC network plus an additional 1ms before initiating the conversion.
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if (b) |
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DELAY_US(11500); //11.5ms
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} |
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/**
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* Start a one-shot temperature reading. |
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*/ |
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void MAX31865::oneShot() { |
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setConfig(MAX31856_CONFIG_1SHOT, 1); |
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// From the datasheet:
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// Note that a single conversion requires approximately 52ms in 60Hz filter
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// mode or 62.5ms in 50Hz filter mode to complete. 1-Shot is a self-clearing bit.
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// TODO: switch this out depeding on the filter mode.
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DELAY_US(65000); // 65ms
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} |
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/**
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* How many wires we have in our RTD setup, can be MAX31865_2WIRE, |
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* MAX31865_3WIRE, or MAX31865_4WIRE |
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* |
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* @param wires The number of wires in enum format |
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*/ |
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void MAX31865::setWires(max31865_numwires_t wires) { |
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uint8_t t = readRegister8(MAX31856_CONFIG_REG); |
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if (wires == MAX31865_3WIRE) |
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t |= MAX31856_CONFIG_3WIRE; |
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else // 2 or 4 wire
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t &= ~MAX31856_CONFIG_3WIRE; |
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writeRegister8(MAX31856_CONFIG_REG, t); |
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} |
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/**
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* Read the raw 16-bit value from the RTD_REG in one shot mode. This will include |
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* the fault bit, D0. |
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* |
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* @return The raw unsigned 16-bit register value with ERROR bit attached, NOT temperature! |
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*/ |
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uint16_t MAX31865::readRaw() { |
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clearFault(); |
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enableBias(true); |
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oneShot(); |
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uint16_t rtd = readRegister16(MAX31856_RTDMSB_REG); |
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#ifdef MAX31865_DEBUG |
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SERIAL_ECHOLNPAIR("RTD MSB:", (rtd >> 8), " RTD LSB:", (rtd & 0x00FF)); |
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#endif |
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// Disable the bias to lower power dissipation between reads.
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// If the ref resistor heats up, the temperature reading will be skewed.
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enableBias(false); |
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return rtd; |
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} |
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/**
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* Calulate and return the resistance value of the connected RTD. |
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* |
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* @param refResistor The value of the matching reference resistor, usually 430 or 4300 |
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* @return The raw RTD resistance value, NOT temperature! |
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*/ |
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float MAX31865::readResistance() { |
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// Strip the error bit (D0) and convert to a float ratio.
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// less precise method: (readRaw() * Rref) >> 16
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return (((readRaw() >> 1) / 32768.0f) * Rref); |
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} |
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/**
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* Read the RTD and pass it to temperature(float) for calculation. |
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* |
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* @return Temperature in C |
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*/ |
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float MAX31865::temperature() { |
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return temperature(readResistance()); |
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} |
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/**
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* Given the 15-bit ADC value, calculate the resistance and pass it to temperature(float) for calculation. |
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* |
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* @return Temperature in C |
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*/ |
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float MAX31865::temperature(uint16_t adcVal) { |
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return temperature(((adcVal) / 32768.0f) * Rref); |
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} |
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/**
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* Calculate the temperature in C from the RTD resistance. |
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* Uses the technique outlined in this PDF: |
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* http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
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* |
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* @param Rrtd the resistance value in ohms |
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* @return the temperature in degC |
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*/ |
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float MAX31865::temperature(float Rrtd) { |
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float temp = (RTD_Z1 + sqrt(RTD_Z2 + (RTD_Z3 * Rrtd))) / RTD_Z4; |
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// From the PDF...
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//
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// The previous equation is valid only for temperatures of 0°C and above.
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// The equation for RRTD(t) that defines negative temperature behavior is a
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// fourth-order polynomial (after expanding the third term) and is quite
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// impractical to solve for a single expression of temperature as a function
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// of resistance.
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//
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if (temp < 0) { |
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Rrtd = (Rrtd / Rzero) * 100; // normalize to 100 ohm
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float rpoly = Rrtd; |
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temp = -242.02 + (2.2228 * rpoly); |
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rpoly *= Rrtd; // square
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temp += 2.5859e-3 * rpoly; |
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rpoly *= Rrtd; // ^3
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temp -= 4.8260e-6 * rpoly; |
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rpoly *= Rrtd; // ^4
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temp -= 2.8183e-8 * rpoly; |
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rpoly *= Rrtd; // ^5
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temp += 1.5243e-10 * rpoly; |
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} |
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return temp; |
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} |
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//
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// private:
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//
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/**
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* Set a value in the configuration register. |
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* |
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* @param config 8-bit value for the config item |
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* @param enable whether to enable or disable the value |
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*/ |
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void MAX31865::setConfig(uint8_t config, bool enable) { |
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uint8_t t = readRegister8(MAX31856_CONFIG_REG); |
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if (enable) |
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t |= config; |
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else |
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t &= ~config; // disable
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writeRegister8(MAX31856_CONFIG_REG, t); |
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} |
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/**
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* Read a single byte from the specified register address. |
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* |
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* @param addr the register address |
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* @return the register contents |
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*/ |
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uint8_t MAX31865::readRegister8(uint8_t addr) { |
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uint8_t ret = 0; |
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readRegisterN(addr, &ret, 1); |
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return ret; |
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} |
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/**
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* Read two bytes: 1 from the specified register address, and 1 from the next address. |
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* |
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* @param addr the first register address |
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* @return both register contents as a single 16-bit int |
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*/ |
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uint16_t MAX31865::readRegister16(uint8_t addr) { |
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uint8_t buffer[2] = {0, 0}; |
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readRegisterN(addr, buffer, 2); |
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uint16_t ret = buffer[0]; |
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ret <<= 8; |
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ret |= buffer[1]; |
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return ret; |
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} |
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/**
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* Read +n+ bytes from a specified address into +buffer+. Set D7 to 0 to specify a read. |
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* |
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* @param addr the first register address |
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* @param buffer storage for the read bytes |
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* @param n the number of bytes to read |
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*/ |
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void MAX31865::readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n) { |
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addr &= 0x7F; // make sure top bit is not set
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if (_sclk == TERN(LARGE_PINMAP, -1UL, -1)) |
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SPI.beginTransaction(spiConfig); |
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else |
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WRITE(_sclk, LOW); |
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WRITE(_cs, LOW); |
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spixfer(addr); |
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while (n--) { |
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buffer[0] = spixfer(0xFF); |
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#ifdef MAX31865_DEBUG_SPI |
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SERIAL_ECHOLNPAIR("buffer read ", n, " data: ", buffer[0]); |
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#endif |
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buffer++; |
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} |
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if (_sclk == TERN(LARGE_PINMAP, -1UL, -1)) |
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SPI.endTransaction(); |
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WRITE(_cs, HIGH); |
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} |
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/**
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* Write an 8-bit value to a register. Set D7 to 1 to specify a write. |
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* |
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* @param addr the address to write to |
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* @param data the data to write |
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*/ |
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void MAX31865::writeRegister8(uint8_t addr, uint8_t data) { |
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if (_sclk == TERN(LARGE_PINMAP, -1UL, -1)) |
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SPI.beginTransaction(spiConfig); |
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else |
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WRITE(_sclk, LOW); |
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WRITE(_cs, LOW); |
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spixfer(addr | 0x80); // make sure top bit is set
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spixfer(data); |
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if (_sclk == TERN(LARGE_PINMAP, -1UL, -1)) |
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SPI.endTransaction(); |
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WRITE(_cs, HIGH); |
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} |
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/**
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* Transfer SPI data +x+ and read the response. From the datasheet... |
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* Input data (SDI) is latched on the internal strobe edge and output data (SDO) is |
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* shifted out on the shift edge. There is one clock for each bit transferred. |
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* Address and data bits are transferred in groups of eight, MSB first. |
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* |
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* @param x an 8-bit chunk of data to write |
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* @return the 8-bit response |
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*/ |
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uint8_t MAX31865::spixfer(uint8_t x) { |
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if (_sclk == TERN(LARGE_PINMAP, -1UL, -1)) |
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return SPI.transfer(x); |
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uint8_t reply = 0; |
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for (int i = 7; i >= 0; i--) { |
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reply <<= 1; |
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WRITE(_sclk, HIGH); |
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WRITE(_mosi, x & (1 << i)); |
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WRITE(_sclk, LOW); |
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if (READ(_miso)) |
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reply |= 1; |
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} |
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return reply; |
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} |
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#endif // HAS_MAX31865 && !LIB_USR_MAX31865
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@ -0,0 +1,131 @@ |
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/**
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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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|
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/**
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* Based on Adafruit MAX31865 library: |
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* |
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* This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865 |
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* Designed specifically to work with the Adafruit RTD Sensor |
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* https://www.adafruit.com/products/3328
|
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* |
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* This sensor uses SPI to communicate, 4 pins are required to interface. |
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* |
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* Adafruit invests time and resources providing this open source code, |
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* please support Adafruit and open-source hardware by purchasing |
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* products from Adafruit! |
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* |
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* Written by Limor Fried/Ladyada for Adafruit Industries. |
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* |
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* Modifications by JoAnn Manges (@GadgetAngel) |
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* Copyright (c) 2020, JoAnn Manges |
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* All rights reserved. |
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*/ |
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#pragma once |
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|
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#include "../inc/MarlinConfig.h" |
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#include "../HAL/shared/Delay.h" |
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#include HAL_PATH(../HAL, MarlinSPI.h) |
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|
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#define MAX31856_CONFIG_REG 0x00 |
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#define MAX31856_CONFIG_BIAS 0x80 |
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#define MAX31856_CONFIG_MODEAUTO 0x40 |
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#define MAX31856_CONFIG_MODEOFF 0x00 |
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#define MAX31856_CONFIG_1SHOT 0x20 |
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#define MAX31856_CONFIG_3WIRE 0x10 |
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#define MAX31856_CONFIG_24WIRE 0x00 |
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#define MAX31856_CONFIG_FAULTSTAT 0x02 |
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#define MAX31856_CONFIG_FILT50HZ 0x01 |
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#define MAX31856_CONFIG_FILT60HZ 0x00 |
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|
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#define MAX31856_RTDMSB_REG 0x01 |
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#define MAX31856_RTDLSB_REG 0x02 |
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#define MAX31856_HFAULTMSB_REG 0x03 |
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#define MAX31856_HFAULTLSB_REG 0x04 |
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#define MAX31856_LFAULTMSB_REG 0x05 |
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#define MAX31856_LFAULTLSB_REG 0x06 |
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#define MAX31856_FAULTSTAT_REG 0x07 |
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|
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#define MAX31865_FAULT_HIGHTHRESH 0x80 // D7
|
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#define MAX31865_FAULT_LOWTHRESH 0x40 // D6
|
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#define MAX31865_FAULT_REFINLOW 0x20 // D5
|
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#define MAX31865_FAULT_REFINHIGH 0x10 // D4
|
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#define MAX31865_FAULT_RTDINLOW 0x08 // D3
|
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#define MAX31865_FAULT_OVUV 0x04 // D2
|
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|
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// http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
|
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// constants for calulating temperature from the measured RTD resistance.
|
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#define RTD_Z1 -0.0039083 |
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#define RTD_Z2 0.00001758480889 |
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#define RTD_Z3 -0.0000000231 |
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#define RTD_Z4 -0.000001155 |
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|
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typedef enum max31865_numwires { |
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MAX31865_2WIRE = 0, |
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MAX31865_3WIRE = 1, |
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MAX31865_4WIRE = 0 |
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} max31865_numwires_t; |
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|
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/* Interface class for the MAX31865 RTD Sensor reader */ |
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class MAX31865 { |
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private: |
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static SPISettings spiConfig; |
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|
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TERN(LARGE_PINMAP, uint32_t, uint8_t) _sclk, _miso, _mosi, _cs; |
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float Rzero, Rref; |
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|
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void setConfig(uint8_t config, bool enable); |
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|
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void readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n); |
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uint8_t readRegister8(uint8_t addr); |
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uint16_t readRegister16(uint8_t addr); |
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|
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void writeRegister8(uint8_t addr, uint8_t reg); |
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uint8_t spixfer(uint8_t addr); |
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|
|||
public: |
|||
#ifdef LARGE_PINMAP |
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MAX31865(uint32_t spi_cs, uint8_t pin_mapping); |
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MAX31865(uint32_t spi_cs, uint32_t spi_mosi, uint32_t spi_miso, |
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uint32_t spi_clk, uint8_t pin_mapping); |
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#else |
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MAX31865(int8_t spi_cs); |
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MAX31865(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, |
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int8_t spi_clk); |
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#endif |
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|
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void begin(max31865_numwires_t wires, float zero, float ref); |
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|
|||
uint8_t readFault(); |
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void clearFault(); |
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|
|||
void setWires(max31865_numwires_t wires); |
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void autoConvert(bool b); |
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void enable50HzFilter(bool b); |
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void enableBias(bool b); |
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void oneShot(); |
|||
|
|||
uint16_t readRaw(); |
|||
float readResistance(); |
|||
float temperature(); |
|||
float temperature(uint16_t adcVal); |
|||
float temperature(float Rrtd); |
|||
}; |
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Reference in new issue