#ifndef __I2C_BSP_H
#define __I2C_BSP_H

#include "stm32f10x.h"

/*===========================================================================
 * I2C BSP — Board Support Layer for I2C communication
 *
 * Provides generic I2C read/write primitives used by BQ25756 driver.
 * Default: I2C1 (PB6=SCL, PB7=SDA)
 *===========================================================================*/

/**
 * @brief  Initialize I2C1 for BQ25756.
 *         PB6(SCL), PB7(SDA), 400kHz.
 */
void I2C_BSP_Init(void);

/**
 * @brief  Write a buffer to an I2C slave.
 * @param  slave_addr: 7-bit I2C slave address
 * @param  pdata: data buffer to write
 * @param  len: number of bytes
 * @return 0=OK, -1=error
 */
int I2C_BSP_Write(uint8_t slave_addr, const uint8_t *pdata, uint16_t len);

/**
 * @brief  Read from an I2C slave with register address first.
 *         Sends reg_addr, then repeated-start + read.
 * @param  slave_addr: 7-bit I2C slave address
 * @param  reg_addr: register address byte to send first
 * @param  pbuf: receive buffer
 * @param  len: number of bytes to read
 * @return 0=OK, -1=error
 */
int I2C_BSP_Read(uint8_t slave_addr, uint8_t reg_addr, uint8_t *pbuf, uint16_t len);

#endif /* __I2C_BSP_H */