#ifndef I2C1_H
#define I2C1_H

#include "stm32f7xx_hal.h"

/*
 * Shared I2C1 bus handle — used by baro (BMP280/DPS310) and mag
 * (QMC5883L/HMC5883L/IST8310) drivers.
 *
 * Call i2c1_init() once in main() before any I2C probes.
 * PB8 = SCL, PB9 = SDA (AF4_I2C1, open-drain, 100 kHz).
 */
extern I2C_HandleTypeDef hi2c1;

int i2c1_init(void);

#endif /* I2C1_H */

int i2c1_write(uint16_t addr, const uint8_t *data, uint16_t len);
int i2c1_read(uint16_t addr, uint8_t *data, uint16_t len);