max116xx.h

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/*
 *   openMMC -- Open Source modular IPM Controller firmware
 *
 *   Copyright (C) 2021  Augusto Fraga Giachero <augusto.fraga@cnpem.br>
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *   @license GPL-3.0+ <http://spdx.org/licenses/GPL-3.0+>
 */
 
#ifndef MAX116XX_H_
#define MAX116XX_H_
 
#include "mmc_error.h"
#include "port.h"
 
enum max116xx_ref_sel {
    MAX116XX_REF_VDD = 0b0000000, // VDD as voltage reference, AIN_/REF configured as an analog input
    MAX116XX_REF_EXT = 0b0100000, // External reference, AIN_/REF configured as an reference input
    MAX116XX_REF_INT_OFF = 0b1000000, // Internal reference off, AIN_/REF configured as an analog input
    MAX116XX_REF_INT_ON = 0b1010000, // Internal reference on, AIN_/REF configured as an analog input
    MAX116XX_REF_INT_OFF_OUT = 0b1100000, // Internal reference off, AIN_/REF configured as reference output
    MAX116XX_REF_INT_ON_OUT = 0b1110000, // Internal reference on, AIN_/REF configured as reference output
};
 
enum max116xx_clk_sel {
    MAX116XX_CLK_INT = 0b0000,
    MAX116XX_CLK_EXT = 0b1000,
};
 
enum max116xx_pol_sel {
    MAX116XX_UNIPOLAR = 0b000,
    MAX116XX_BIPOLAR = 0b100,
};
 
enum max116xx_scan_mode {
    MAX116XX_SCAN_FROM_AIN0 = 0b000000,
    MAX116XX_SCAN_OFF = 0b010000,
    MAX116XX_SCAN_UPPER = 0b100000,
    MAX116XX_SCAN_OFF_SINGLE_CONV = 0b110000,
};
 
enum max116xx_diff_mode {
    MAX116XX_DIFFERENTIAL = 0,
    MAX116XX_SINGLE_ENDED = 1,
};
 
typedef struct {
    enum max116xx_ref_sel ref_sel;
    enum max116xx_clk_sel clk_sel;
    enum max116xx_pol_sel pol_sel;
    enum max116xx_scan_mode scan_mode;
    uint8_t channel_sel;
    enum max116xx_diff_mode diff_mode;
} max116xx_cfg;
 
mmc_err max116xx_set_config(uint8_t chip_id, const max116xx_cfg* cfg);
 
mmc_err max116xx_read_uni(uint8_t chip_id, int16_t data[], uint8_t samples);
 
mmc_err max116xx_read_bip(uint8_t chip_id, int16_t data[], uint8_t samples);
 
#endif