i2c_master.h

/* Copyright 2018 Jack Humbert
 * Copyright 2018 Yiancar
 *
 * 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 2 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/>.
 */

/* This library is only valid for STM32 processors.
 * This library follows the convention of the AVR i2c_master library.
 * As a result addresses are expected to be already shifted (addr << 1).
 * I2CD1 is the default driver which corresponds to pins B6 and B7. This
 * can be changed.
 * Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that
 * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. Pins B6 and B7 are used
 * but using any other I2C pins should be trivial.
 */
#include "ch.h"
#include <hal.h>

#ifndef I2C1_BANK
#define I2C1_BANK GPIOB
#endif
#ifndef I2C1_SCL
#define I2C1_SCL 6
#endif
#ifndef I2C1_SDA
#define I2C1_SDA 7
#endif

#ifndef I2C_DRIVER
#define I2C_DRIVER I2CD1
#endif

typedef int16_t i2c_status_t;

// typedef i2c_status_t (*_i2cTransmit)(uint8_t address, const uint8_t *data, uint16_t length, uint16_t timeout);
// typedef i2c_status_t (*_i2cReceive)(uint8_t address, uint8_t *data, uint16_t length, uint16_t timeout);
// typedef i2c_status_t (*_i2cWriteReg)(uint8_t devaddr, uint8_t regaddr, const uint8_t *data, uint16_t length, uint16_t timeout);
// typedef i2c_status_t (*_i2cReadReg)(uint8_t devaddr, uint8_t *regaddr, uint8_t *data, uint16_t length, uint16_t timeout);
// typedef void (*_i2cStop)(void);

// typedef struct i2c_state {
//     I2CDriver *driver;
//     I2CConfig *config;
//     _i2cTransmit transmit;
//     _i2cReceive receive;
//     _i2cWriteReg writeReg;
//     _i2cReadReg readReg;
//     _i2cStop stop;
// } i2c_state;

#define I2C_STATUS_SUCCESS (0)
#define I2C_STATUS_ERROR   (-1)
#define I2C_STATUS_TIMEOUT (-2)

void i2c_init(void);
i2c_status_t i2c_start(uint8_t address);
i2c_status_t i2c_transmit(uint8_t address, const uint8_t *data, uint16_t length, uint16_t timeout);
i2c_status_t i2c_receive(uint8_t address, uint8_t *data, uint16_t length, uint16_t timeout);
i2c_status_t i2c_transmit_receive(uint8_t address, uint8_t *tx_body, uint16_t tx_length, uint8_t *rx_body, uint16_t rx_length);
i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t *data, uint16_t length, uint16_t timeout);
i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t *regaddr, uint8_t *data, uint16_t length, uint16_t timeout);
void i2c_stop(void);