mirror of https://github.com/wolfSSL/wolfBoot.git
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* i2c_drv.h
|
|
*
|
|
* Generic I2C master interface for wolfBoot back-end drivers.
|
|
*
|
|
* Copyright (C) 2026 wolfSSL Inc.
|
|
*
|
|
* This file is part of wolfBoot.
|
|
*
|
|
* wolfBoot 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.
|
|
*
|
|
* wolfBoot 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, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
|
|
*/
|
|
|
|
#ifndef I2C_DRV_H_INCLUDED
|
|
#define I2C_DRV_H_INCLUDED
|
|
|
|
#include <stdint.h>
|
|
|
|
/* Return codes. A device that is awake but busy answers a transfer with
|
|
* I2C_ERR_NACK, which callers use to decide whether to retry. */
|
|
#define I2C_OK (0)
|
|
#define I2C_ERR_NACK (-1)
|
|
#define I2C_ERR_TIMEOUT (-2)
|
|
#define I2C_ERR_BUS (-3)
|
|
#define I2C_ERR_ARG (-4)
|
|
|
|
#if defined(WOLFBOOT_TPM_I2C)
|
|
|
|
#if defined(TARGET_psoc_c3)
|
|
#include "hal/i2c/i2c_drv_psoc_c3.h"
|
|
#endif
|
|
|
|
/* Bring the controller up. Safe to call more than once. */
|
|
void i2c_init(void);
|
|
|
|
/* Release the bus and leave the pins in a safe state. */
|
|
void i2c_release(void);
|
|
|
|
/* Address a 7-bit slave and write len bytes. A zero stop leaves the bus held
|
|
* so the next call issues a repeated start; a non-zero stop releases it.
|
|
* Which of the two a device needs between selecting a register and reading it
|
|
* is device specific. */
|
|
int i2c_write(uint8_t addr, const uint8_t *buf, uint32_t len, int stop);
|
|
|
|
/* Address a 7-bit slave and read len bytes. The final byte is NACKed, as the
|
|
* protocol requires, before the optional stop. */
|
|
int i2c_read(uint8_t addr, uint8_t *buf, uint32_t len, int stop);
|
|
|
|
#endif /* WOLFBOOT_TPM_I2C */
|
|
#endif /* I2C_DRV_H_INCLUDED */
|