ad7746.h

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/*
 * Copyright (C) 2019 HAW Hamburg
 *
 * 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

 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "periph/i2c.h"
#include "periph/gpio.h"

#define AD7746_ZERO_SCALE_CODE  (0x800000LL)

#define AD7746_INTERNAL_VREF    (1170)

#define AD7746_DAC_MAX          (0x7F)

enum {
    AD7746_READ_CAP_CH = 0, 
    AD7746_READ_VT_CH  = 1  
};

enum {
    AD7746_OK          =  0,       
    AD7746_NOI2C       = -1,       
    AD7746_NODEV       = -2,       
    AD7746_NODATA      = -3        
};

typedef enum {
    AD7746_VT_SR_498 = 0, 
    AD7746_VT_SR_312 = 1, 
    AD7746_VT_SR_161 = 2, 
    AD7746_VT_SR_082 = 3  
} ad7746_vt_sample_rate_t;

typedef enum {
    AD7746_VT_MD_DIS   = -1, 
    AD7746_VT_MD_TEMP  = 0,  
    AD7746_VT_MD_ETEMP = 1,  
    AD7746_VT_MD_VDD   = 2,  
    AD7746_VT_MD_VIN   = 3   
} ad7746_vt_mode_t;

typedef enum {
    AD7746_CAP_IN_1 = 0, 
    AD7746_CAP_IN_2      
} ad7746_cap_input_t;

typedef enum {
    AD7746_CAP_SR_909 = 0, 
    AD7746_CAP_SR_838 = 1, 
    AD7746_CAP_SR_500 = 2, 
    AD7746_CAP_SR_263 = 3, 
    AD7746_CAP_SR_161 = 4, 
    AD7746_CAP_SR_130 = 5, 
    AD7746_CAP_SR_109 = 6, 
    AD7746_CAP_SR_091 = 7  
} ad7746_cap_sample_rate_t;

typedef enum {
    AD7746_EXC_A  = 0x06,  
    AD7746_EXC_B  = 0x09,  
    AD7746_EXC_AB = 0x0A   
} ad7746_exc_config_t;

typedef struct ad7746_params {
    i2c_t i2c;                                
    uint8_t addr;                             
    uint8_t dac_a_cap;                        
    uint8_t dac_b_cap;                        
    ad7746_exc_config_t exc_config;           
    ad7746_cap_sample_rate_t cap_sample_rate; 
    ad7746_vt_sample_rate_t vt_sample_rate;   
    ad7746_vt_mode_t vt_mode;                 
    ad7746_cap_input_t cap_input;             
} ad7746_params_t;

typedef struct ad7746 {
    ad7746_params_t params; 
} ad7746_t;

int ad7746_init(ad7746_t *dev, const ad7746_params_t *params);

int ad7746_read_capacitance_1(ad7746_t *dev, int *value);

int ad7746_read_capacitance_2(ad7746_t *dev, int *value);

int ad7746_read_voltage_in(ad7746_t *dev, int *value);

int ad7746_read_voltage_vdd(ad7746_t *dev, int *value);

int ad7746_read_temperature_int(ad7746_t *dev, int *value);

int ad7746_read_temperature_ext(ad7746_t *dev, int *value);

int ad7746_set_cap_ch_input(const ad7746_t *dev, ad7746_cap_input_t input);

int ad7746_set_vt_ch_mode(ad7746_t *dev, ad7746_vt_mode_t mode);

int ad7746_set_vt_sr(const ad7746_t *dev, ad7746_vt_sample_rate_t sr);

int ad7746_set_cap_sr(const ad7746_t *dev, ad7746_cap_sample_rate_t sr);
 
#ifdef __cplusplus
}
#endif