From 11f08804d16ad0747afa87aa701e0b0e706406de Mon Sep 17 00:00:00 2001 From: JoAnn Manges Date: Wed, 18 Nov 2020 21:12:03 -0800 Subject: [PATCH] Use RTD for MAX31865 reading (#20188) --- Marlin/src/module/temperature.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp index 167b35cc2b..19de70b31c 100644 --- a/Marlin/src/module/temperature.cpp +++ b/Marlin/src/module/temperature.cpp @@ -2248,10 +2248,7 @@ void Temperature::disable_all_heaters() { #if HAS_MAX31865 Adafruit_MAX31865 &maxref = MAX6675_SEL(max31865_0, max31865_1); - max6675_temp = int(maxref.temperature( - MAX6675_SEL(MAX31865_SENSOR_OHMS_0, MAX31865_SENSOR_OHMS_1), - MAX6675_SEL(MAX31865_CALIBRATION_OHMS_0, MAX31865_CALIBRATION_OHMS_1) - )); + const uint16_t max31865_ohms = (uint32_t(maxref.readRTD()) * MAX6675_SEL(MAX31865_CALIBRATION_OHMS_0, MAX31865_CALIBRATION_OHMS_1)) >> 16; #endif // @@ -2325,6 +2322,9 @@ void Temperature::disable_all_heaters() { if (max6675_temp & 0x00002000) max6675_temp |= 0xFFFFC000; // Support negative temperature #endif + // Return the RTD resistance for MAX31865 for display in SHOW_TEMP_ADC_VALUES + TERN_(HAS_MAX31865, max6675_temp = max31865_ohms); + MAX6675_TEMP(hindex) = max6675_temp; return int(max6675_temp);