mirror of
https://github.com/apache/nuttx.git
synced 2026-08-01 20:28:58 +00:00
da6a682abc
This commit adds a new lower-half driver implementation for I2C bit-bang
that uses IO expander pins as the GPIO backend, enabling I2C bit-bang
functionality on systems where direct GPIO access is not available or
when I2C needs to be implemented using IO expander pins.
Background:
The existing I2C bit-bang driver (i2c_bitbang.c) provides a generic
upper-half implementation that requires a platform-specific lower-half
to control the SDA and SCL GPIO lines. Previously, each platform had to
implement its own lower-half using direct GPIO access.
Usage Example:
FAR struct ioexpander_dev_s *ioe = /* get IO expander */;
FAR struct i2c_master_s *i2c;
/* Initialize I2C bit-bang using IO expander pins 10 (SCL) and 11 (SDA) */
i2c = i2c_bitbang_ioexpander_initialize(ioe, 10, 11, 0);
if (i2c)
{
/* Use i2c master device normally */
}
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
54 lines
1.6 KiB
CMake
54 lines
1.6 KiB
CMake
# ##############################################################################
|
|
# drivers/i2c/CMakeLists.txt
|
|
#
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
#
|
|
# Licensed to the Apache Software Foundation (ASF) under one or more contributor
|
|
# license agreements. See the NOTICE file distributed with this work for
|
|
# additional information regarding copyright ownership. The ASF licenses this
|
|
# file to you under the Apache License, Version 2.0 (the "License"); you may not
|
|
# use this file except in compliance with the License. You may obtain a copy of
|
|
# the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations under
|
|
# the License.
|
|
#
|
|
# ##############################################################################
|
|
|
|
if(CONFIG_I2C)
|
|
set(SRCS i2c_read.c i2c_write.c i2c_writeread.c)
|
|
|
|
if(CONFIG_I2C_DRIVER)
|
|
list(APPEND SRCS i2c_driver.c)
|
|
endif()
|
|
|
|
if(CONFIG_I2C_BITBANG)
|
|
list(APPEND SRCS i2c_bitbang.c)
|
|
|
|
if(CONFIG_I2C_BITBANG_IOEXPANDER)
|
|
list(APPEND SRCS i2c_bitbang_ioexpander.c)
|
|
endif()
|
|
|
|
endif()
|
|
|
|
if(CONFIG_I2C_SLAVE_DRIVER)
|
|
list(APPEND SRCS i2c_slave_driver.c)
|
|
endif()
|
|
|
|
# Include the selected I2C multiplexer drivers
|
|
|
|
if(CONFIG_I2CMULTIPLEXER_PCA9540BDP)
|
|
list(APPEND SRCS pca9540bdp.c)
|
|
endif()
|
|
|
|
if(CONFIG_I2CMULTIPLEXER_TCA9548A)
|
|
list(APPEND SRCS tca9548a.c)
|
|
endif()
|
|
|
|
target_sources(drivers PRIVATE ${SRCS})
|
|
endif()
|