max31865.h

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/*
 * Copyright (C) 2025 David Picard
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
/* Add header includes here */
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "periph/spi.h"

typedef enum {
    MAX31865_LUTCOL_CODE        = 0,    
    MAX31865_LUTCOL_TEMP        = 1,    
    MAX31865_LUTCOL_A0          = 2,    
    MAX31865_LUTCOL_A1          = 3,    
    MAX31865_LUTCOL_NUMOF               
} max31865_lutcols_t;

typedef struct {
    spi_t spi;                      
    spi_cs_t cs_pin;                
    uint8_t cfg_byte;               
    int32_t temp_low_threshold;     
    int32_t temp_high_threshold;    
    const int32_t (*lut)[][MAX31865_LUTCOL_NUMOF];    
    const int lut_numlines;         
} max31865_params_t;

typedef struct {
    const max31865_params_t *params;  
} max31865_t;

typedef enum {
    MAX31865_FAULT_NO_FAULT     = 0,    
    MAX31865_FAULT_RTD_HIGH     = 1,    
    MAX31865_FAULT_RTD_LOW      = 2,    
    MAX31865_FAULT_CIRCUIT      = 3,    
    MAX31865_FAULT_VOLTAGE      = 4     
} max31865_fault_t;

int max31865_init(max31865_t *dev, const max31865_params_t *params);

void max31865_clear_fault(const max31865_t *dev, uint8_t *config);

int max31865_read(const max31865_t *dev, int32_t *rtd_temperature_cdegc);

int max31865_read_raw(const max31865_t *dev, uint16_t *raw_data);

int max31865_raw_to_data(const max31865_t *dev, uint16_t raw_data, int32_t *rtd_temperature_cdegc);

int max31865_detect_fault(const max31865_t *dev, max31865_fault_t *flt_code);

void max31865_switch_vbias(const max31865_t *dev, bool enable);

void max31865_oneshot(const max31865_t *dev);
 
#ifdef __cplusplus
}
#endif