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/* Copyright 2018 Jack Humbert
* Copyright 2018 Yiancar
*
* This program is free sofare: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Sofare 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 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.
*/
#include "ch.h"
#include <hal.h>
#ifdef I2C1_BANK
#define I2C1_SCL_BANK I2C1_BANK
#define I2C1_SDA_BANK I2C1_BANK
#endif
#ifndef I2C1_SCL_BANK
#define I2C1_SCL_BANK GPIOB
#endif
#ifndef I2C1_SDA_BANK
#define I2C1_SDA_BANK GPIOB
#endif
#ifndef I2C1_SCL
#define I2C1_SCL 6
#endif
#ifndef I2C1_SDA
#define I2C1_SDA 7
#endif
// The default PAL alternate modes are used to signal that the pins are used for I2C
#ifndef I2C1_SCL_PAL_MODE
#define I2C1_SCL_PAL_MODE 4
#endif
#ifndef I2C1_SDA_PAL_MODE
#define I2C1_SDA_PAL_MODE 4
#endif
// The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock
// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
#ifndef I2C1_TIMINGR_PRESC
#define I2C1_TIMINGR_PRESC 15U
#endif
#ifndef I2C1_TIMINGR_SCLDEL
#define I2C1_TIMINGR_SCLDEL 4U
#endif
#ifndef I2C1_TIMINGR_SDADEL
#define I2C1_TIMINGR_SDADEL 2U
#endif
#ifndef I2C1_TIMINGR_SCLH
#define I2C1_TIMINGR_SCLH 15U
#endif
#ifndef I2C1_TIMINGR_SCLL
#define I2C1_TIMINGR_SCLL 21U
#endif
#ifndef I2C_DRIVER
#define I2C_DRIVER I2CD1
#endif
typedef int16_t i2c_status_t;
#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);
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