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🐛 Fix MAX31865 PT1000 normalization (#24407)

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Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>
This commit is contained in:
John Lagonikas
2022-06-29 01:53:05 +03:00
committed by GitHub
parent d6fc3d2b69
commit 31d286750c
2 changed files with 45 additions and 33 deletions
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13
Marlin/src/libs/MAX31865.h
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@@ -73,13 +73,6 @@
#define MAX31865_FAULT_RTDINLOW 0x08 // D3
#define MAX31865_FAULT_OVUV 0x04 // D2
// http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
// constants for calculating temperature from the measured RTD resistance.
#define RTD_Z1 -0.0039083
#define RTD_Z2 0.00001758480889
#define RTD_Z3 -0.0000000231
#define RTD_Z4 -0.000001155
typedef enum max31865_numwires {
MAX31865_2WIRE = 0,
MAX31865_3WIRE = 1,
@@ -103,7 +96,7 @@ private:
uint16_t spiDelay;
float zeroRes, refRes, wireRes;
float resNormalizer, refRes, wireRes;
#if ENABLED(MAX31865_USE_READ_ERROR_DETECTION)
millis_t lastReadStamp = 0;
@@ -160,7 +153,7 @@ public:
int8_t spi_clk);
#endif
void begin(max31865_numwires_t wires, float zero_res, float ref_res, float wire_res);
void begin(max31865_numwires_t wires, const_float_t zero_res, const_float_t ref_res, const_float_t wire_res);
uint8_t readFault();
void clearFault();
@@ -168,6 +161,6 @@ public:
uint16_t readRaw();
float readResistance();
float temperature();
float temperature(uint16_t adc_val);
float temperature(const uint16_t adc_val);
float temperature(float rtd_res);
};