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Merge branch 'issue/21-calibration' of mhu/reflow-oven-control-sw into dev

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Mario Hüttel 2020-11-16 18:44:59 +01:00 committed by Gogs
commit d51c73d694
5 changed files with 9 additions and 8 deletions
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6
doc/source/firmware/pt1000-processing.rst
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@ -132,7 +132,7 @@ and
.. doxygenfunction:: adc_pt1000_get_resistance_calibration
:outline:
are used to set the reistance calibration internally. For a guide on how to calibrate the deivce, see the corresponding :ref:`usage_calibration` usage page.
are used to set the resistance calibration internally. For a guide on how to calibrate the deivce, see the corresponding :ref:`usage_calibration` usage page.
The calibration is calculated the following way:
@ -147,13 +147,13 @@ The calibration is calculated the following way:
OFFSET [label="Offset", description="Offset Correction :math:`O`"];
OUT [shape=endpoint, description="Corrected Value"];
LF -> SENS -> OFFSET -> OUT
LF -> OFFSET -> SENS -> OUT
}
The final calibrated PT1000 resistance is calculated as:
.. math::
R_{PT1000_{corr}} = R_{PT1000_{LF}} \cdot (1 + \sigma) + O
R_{PT1000_{corr}} = (R_{PT1000_{LF}} - O) \cdot (1 + \sigma)
The default values, if no calibration is loaded / executed, are:

1
stm-firmware/.gitignore vendored
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@ -14,3 +14,4 @@ reflow-controller.includes
*.includes
*.config
*.files
*.user.*

2
stm-firmware/adc-meas.c
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@ -216,7 +216,7 @@ void adc_pt1000_get_resistance_calibration(float *offset, float *sensitivity_dev
static inline float adc_pt1000_apply_calibration(float raw_resistance)
{
if (calibration_active)
return pt1000_res_raw_lf * (1.0f + pt1000_sens_dev) + pt1000_offset;
return (raw_resistance - pt1000_offset) * (1.0f + pt1000_sens_dev);
else
return raw_resistance;

6
stm-firmware/calibration.c
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@ -30,9 +30,9 @@
enum calibration_shell_state {CAL_START = 0, CAL_WAIT_RES1, CAL_MEAS_RES1, CAL_WAIT_RES2, CAL_MEAS_RES2};
void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
float *sens_deviation, float *sens_corrected_offset)
float *sens_deviation, float *offset)
{
if (!sens_deviation || !sens_corrected_offset)
if (!sens_deviation || !offset)
return;
float delta_y;
@ -45,7 +45,7 @@ void calibration_calculate(float low_measured, float low_setpoint, float high_me
sens_corr_mult = delta_x / delta_y;
*sens_deviation = sens_corr_mult - 1.0f;
*sens_corrected_offset = low_setpoint - low_measured * sens_corr_mult;
*offset = (high_setpoint * low_measured - low_setpoint * high_measured) / (high_setpoint - low_setpoint);
}

2
stm-firmware/include/reflow-controller/calibration.h
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@ -27,7 +27,7 @@
#include <shellmatta.h>
void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
float *sens_deviation, float *sens_corrected_offset);
float *sens_deviation, float *offset);
float *calibration_acquire_data_start(uint32_t count, volatile int *flag);