diff options
| -rw-r--r-- | klippy/extras/spi_temperature.py | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/klippy/extras/spi_temperature.py b/klippy/extras/spi_temperature.py index 9970a28d..77033b1b 100644 --- a/klippy/extras/spi_temperature.py +++ b/klippy/extras/spi_temperature.py @@ -320,9 +320,10 @@ class MAX31865(SensorBase): def calc_adc(self, temp): # Calculate relative resistance via Callendar-Van Dusen formula: # resistance = rtd_nominal_r * (1 + CVD_A * temp + CVD_B * temp**2) + temp = min(temp, 1768.3) # Melting point of platinum R_div_nominal = 1. + CVD_A * temp + CVD_B * temp * temp adc = int(R_div_nominal / self.adc_to_resist_div_nominal + 0.5) - adc = max(0, min(MAX31865_ADC_MAX, adc)) + adc = max(0, min(MAX31865_ADC_MAX - 1, adc)) adc = adc << 1 # Add fault bit return adc def build_spi_init(self, config): |