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ads1115.h
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ads1115.h
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#ifdef __cplusplus
extern "C" {
#endif
#ifndef ADS1115_H
#define ADS1115_H
#include <stdio.h>
#include "driver/i2c.h"
#include "driver/gpio.h"
typedef enum { // register address
ADS1115_CONVERSION_REGISTER_ADDR = 0,
ADS1115_CONFIG_REGISTER_ADDR,
ADS1115_LO_THRESH_REGISTER_ADDR,
ADS1115_HI_THRESH_REGISTER_ADDR,
ADS1115_MAX_REGISTER_ADDR
} ads1115_register_addresses_t;
typedef enum { // multiplex options
ADS1115_MUX_0_1 = 0,
ADS1115_MUX_0_3,
ADS1115_MUX_1_3,
ADS1115_MUX_2_3,
ADS1115_MUX_0_GND,
ADS1115_MUX_1_GND,
ADS1115_MUX_2_GND,
ADS1115_MUX_3_GND,
} ads1115_mux_t;
typedef enum { // full-scale resolution options
ADS1115_FSR_6_144 = 0,
ADS1115_FSR_4_096,
ADS1115_FSR_2_048,
ADS1115_FSR_1_024,
ADS1115_FSR_0_512,
ADS1115_FSR_0_256,
} ads1115_fsr_t;
typedef enum { // samples per second
ADS1115_SPS_8 = 0,
ADS1115_SPS_16,
ADS1115_SPS_32,
ADS1115_SPS_64,
ADS1115_SPS_128,
ADS1115_SPS_250,
ADS1115_SPS_475,
ADS1115_SPS_860
} ads1115_sps_t;
typedef enum {
ADS1115_MODE_CONTINUOUS = 0,
ADS1115_MODE_SINGLE
} ads1115_mode_t;
typedef union { // configuration register
struct {
uint16_t COMP_QUE:2; // bits 0.. 1 Comparator queue and disable
uint16_t COMP_LAT:1; // bit 2 Latching Comparator
uint16_t COMP_POL:1; // bit 3 Comparator Polarity
uint16_t COMP_MODE:1; // bit 4 Comparator Mode
uint16_t DR:3; // bits 5.. 7 Data rate
uint16_t MODE:1; // bit 8 Device operating mode
uint16_t PGA:3; // bits 9.. 11 Programmable gain amplifier configuration
uint16_t MUX:3; // bits 12.. 14 Input multiplexer configuration
uint16_t OS:1; // bit 15 Operational status or single-shot conversion start
} bit;
uint16_t reg;
} ADS1115_CONFIG_REGISTER_Type;
typedef struct {
bool in_use; // gpio is used
gpio_num_t pin; // ready pin
xQueueHandle gpio_evt_queue; // pin triggered queue
} ads1115_rdy_pin_t;
typedef struct {
ADS1115_CONFIG_REGISTER_Type config;
i2c_port_t i2c_port;
int address;
ads1115_rdy_pin_t rdy_pin;
ads1115_register_addresses_t last_reg; // save last accessed register
bool changed; // save if a value was changed or not
TickType_t max_ticks; // maximum wait ticks for i2c bus
} ads1115_t;
// initialize device
ads1115_t ads1115_config(i2c_port_t i2c_port, uint8_t address); // set up configuration
// set configuration
void ads1115_set_rdy_pin(ads1115_t* ads, gpio_num_t gpio); // set up data-ready pin
void ads1115_set_mux(ads1115_t* ads, ads1115_mux_t mux); // set multiplexer
void ads1115_set_pga(ads1115_t* ads, ads1115_fsr_t fsr); // set fsr
void ads1115_set_mode(ads1115_t* ads, ads1115_mode_t mode); // set read mode
void ads1115_set_sps(ads1115_t* ads, ads1115_sps_t sps); // set sampling speed
void ads1115_set_max_ticks(ads1115_t* ads, TickType_t max_ticks); // maximum wait ticks for i2c bus
int16_t ads1115_get_raw(ads1115_t* ads); // get voltage in bits
double ads1115_get_voltage(ads1115_t* ads); // get voltage in volts
#endif // ifdef ADS1115_H
#ifdef __cplusplus
}
#endif