89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
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/* Reflow Oven Controller
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*
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* Copyright (C) 2020 Mario Hüttel <mario.huettel@gmx.net>
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*
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* This file is part of the reflow Oven Controller Project.
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*
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* The reflow oven controller is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* GDSII-Converter 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 GDSII-Converter. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <reflow-controller/calibration.h>
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#include <reflow-controller/adc-meas.h>
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#include <helper-macros/helper-macros.h>
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#include <arm_math.h>
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#include <stdlib.h>
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void calibration_calculate(float low_measured, float low_setpoint, float high_measured, float high_setpoint,
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float *sens_deviation, float *sens_corrected_offset)
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{
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if (!sens_deviation || !sens_corrected_offset)
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return;
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float delta_y;
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float delta_x;
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float sens_corr_mult;
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delta_y = high_measured - low_measured;
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delta_x = high_setpoint - low_setpoint;
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sens_corr_mult = delta_x / delta_y;
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*sens_deviation = sens_corr_mult - 1.0f;
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*sens_corrected_offset = low_setpoint - low_measured * sens_corr_mult;
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}
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int calibration_acquire_data(float *mu, float *sigma, uint32_t count)
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{
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int status;
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float *stream_mem;
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static volatile int flag = 0;
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if (!mu || !sigma || !count)
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return -1000;
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stream_mem = (float *)calloc(count, sizeof(float));
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if (!stream_mem)
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return -2;
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/* Clear errors of PT1000 reading */
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adc_pt1000_clear_error();
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status = adc_pt1000_stream_raw_value_to_memory(stream_mem, count, &flag);
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if (status)
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return status;
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/* Wait for data to be transferred */
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while (flag == 0);
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if (flag != 1) {
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/* Error */
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return -1;
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}
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/* Convert the stream memory to Ohm readings */
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adc_pt1000_convert_raw_value_array_to_resistance(NULL, stream_mem, count);
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/* Do not compute std-deviation. Too imprecise
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* arm_std_f32(stream_mem, count, sigma);
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*/
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*sigma = 0;
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arm_mean_f32(stream_mem, count, mu);
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free(stream_mem);
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return 0;
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}
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