/*
 * This file is part of the i2cscan project.
 * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
 *
 * 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/>.
 */

#pragma once
#include <stdint.h>

#define I2C_ADDREND     (0x80)
// size in words
#define I2C_BUFSIZE     (1024)

typedef enum{
    I2C_SPEED_10K,
    I2C_SPEED_100K,
    I2C_SPEED_400K,
    I2C_SPEED_1M,
    I2C_SPEED_2M, // EXPERIMENTAL! Could be unstable!!!  (speed near 1.9Mbaud)
    I2C_SPEED_AMOUNT
} i2c_speed_t;

extern i2c_speed_t i2c_curspeed;
extern volatile uint8_t i2c_scanmode;

// timeout of I2C bus in ms
#define I2C_TIMEOUT     (5)

void i2c_setup(i2c_speed_t speed);
int i2c_busy();

uint8_t *i2c_read(uint8_t addr, uint16_t nbytes);
uint8_t i2c_read_dma16(uint8_t addr, uint16_t nwords);
uint16_t *i2c_read_reg16(uint8_t addr, uint16_t reg16, uint16_t nwords, uint8_t isdma);

uint8_t i2c_write(uint8_t addr, uint16_t *data, uint8_t nwords);
uint8_t i2c_write_dma16(uint8_t addr, uint16_t *data, uint8_t nwords);

int i2c_dma_haderr();
uint16_t *i2c_dma_getbuf(uint16_t *len);
int i2c_getwords(uint16_t *buf, int bufsz);

void i2c_init_scan_mode();
int i2c_scan_next_addr(uint8_t *addr);
