80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
#ifndef EIS_H
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#define EIS_H
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#include "ad5940.h"
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#define EIS_MAX_POINTS 100
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typedef enum {
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RTIA_200 = 0, RTIA_1K, RTIA_5K, RTIA_10K,
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RTIA_20K, RTIA_40K, RTIA_80K, RTIA_160K,
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RTIA_EXT_DE0,
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RTIA_COUNT
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} EISRtia;
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typedef enum {
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RCAL_200R = 0, /* RCAL0 ↔ RCAL1 */
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RCAL_3K, /* RCAL0 ↔ AIN0 */
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RCAL_COUNT
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} EISRcal;
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typedef enum {
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ELEC_4WIRE = 0, /* AIN3 drive, AIN0 return, AIN2/AIN1 sense */
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ELEC_3WIRE, /* CE0 drive, RE0 sense+, SE0 sense-/TIA */
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ELEC_COUNT
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} EISElectrode;
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typedef struct {
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float freq_start_hz;
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float freq_stop_hz;
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uint16_t points_per_decade;
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EISRtia rtia;
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EISRcal rcal;
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EISElectrode electrode;
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uint32_t pga;
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uint32_t excit_amp;
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} EISConfig;
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typedef struct {
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float freq_hz;
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float mag_ohms;
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float phase_deg;
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float z_real;
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float z_imag;
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float rtia_mag_before;
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float rtia_mag_after;
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float rev_mag;
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float rev_phase;
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float pct_err;
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} EISPoint;
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typedef int (*eis_point_cb_t)(uint16_t idx, const EISPoint *pt);
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void eis_default_config(EISConfig *cfg);
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void eis_init(const EISConfig *cfg);
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void eis_reconfigure(const EISConfig *cfg);
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int eis_measure_point(float freq_hz, EISPoint *out);
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int eis_sweep(EISPoint *out, uint32_t max_points, eis_point_cb_t cb);
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uint32_t eis_calc_num_points(const EISConfig *cfg);
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int eis_open_cal(EISPoint *buf, uint32_t max_points, eis_point_cb_t cb);
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void eis_clear_open_cal(void);
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int eis_has_open_cal(void);
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void eis_load_open_cal(void);
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void eis_set_cell_k(float k);
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float eis_get_cell_k(void);
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void eis_load_cell_k(void);
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void eis_set_cl_factor(float f);
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float eis_get_cl_factor(void);
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void eis_load_cl_factor(void);
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void eis_set_ph_cal(float slope, float offset);
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float eis_get_ph_slope(void);
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float eis_get_ph_offset(void);
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void eis_load_ph_cal(void);
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#endif
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