forked from Imagelibrary/rtems
fb1d9c8aca
- Implements polling-based I2C communication. - Supports three independent I2C master controllers. - Adds support for 10-bit addressing mode.
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup raspberrypi_4_i2c
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*
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* @brief Raspberry Pi specific I2C definitions.
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*/
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/*
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* Copyright (C) 2025 Shaunak Datar
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LIBBSP_AARCH64_RASPBERRYPI_I2C_H
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#define LIBBSP_AARCH64_RASPBERRYPI_I2C_H
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#include <bsp/raspberrypi.h>
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#include <bsp/rpi-gpio.h>
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#include <bsp/utility.h>
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#include <dev/i2c/i2c.h>
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/**
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* @brief I2C controller instances on Raspberry Pi 4.
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*/
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typedef enum {
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/**
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* @brief BSC Master 0 (GPIO 0/1)
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*/
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raspberrypi_bscm0,
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/**
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* @brief BSC Master 1 (GPIO 2/3)
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*/
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raspberrypi_bscm1,
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/**
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* @brief BSC Master 3 (GPIO 4/5)
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*/
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raspberrypi_bscm3,
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/**
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* @brief BSC Master 4 (GPIO 6/7)
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*/
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raspberrypi_bscm4,
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/**
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* @brief BSC Master 5 (GPIO 10/11)
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*/
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raspberrypi_bscm5,
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/**
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* @brief BSC Master 6 (GPIO 22/23)
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*/
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raspberrypi_bscm6
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} raspberrypi_bsc_masters;
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/**
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* @brief Initialize the I2C bus for a specified master.
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*
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* @param device The BSC master to initialize.
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* @param bus_clock The desired bus clock frequency in Hz.
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*
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* @return RTEMS status code indicating success or failure.
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*/
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rtems_status_code rpi_i2c_init(
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raspberrypi_bsc_masters device,
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uint32_t bus_clock
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);
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#endif /* LIBBSP_AARCH64_RASPBERRYPI_I2C_H */ |