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https://github.com/apache/nuttx.git
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dongjiuzhu1
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>
63 lines
1.7 KiB
Plaintext
63 lines
1.7 KiB
Plaintext
############################################################################
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# drivers/i2c/Make.defs
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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# Don't build anything if there is no I2C support
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ifeq ($(CONFIG_I2C),y)
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CSRCS += i2c_read.c i2c_write.c i2c_writeread.c
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ifeq ($(CONFIG_I2C_DRIVER),y)
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CSRCS += i2c_driver.c
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endif
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ifeq ($(CONFIG_I2C_BITBANG),y)
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CSRCS += i2c_bitbang.c
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ifeq ($(CONFIG_I2C_BITBANG_IOEXPANDER),y)
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CSRCS += i2c_bitbang_ioexpander.c
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endif
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endif
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ifeq ($(CONFIG_I2C_SLAVE_DRIVER),y)
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CSRCS += i2c_slave_driver.c
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endif
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# Include the selected I2C multiplexer drivers
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ifeq ($(CONFIG_I2CMULTIPLEXER_PCA9540BDP),y)
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CSRCS += pca9540bdp.c
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endif
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ifeq ($(CONFIG_I2CMULTIPLEXER_TCA9548A),y)
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CSRCS += tca9548a.c
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endif
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# Include I2C device driver build support
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DEPPATH += --dep-path i2c
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VPATH += :i2c
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CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)drivers$(DELIM)i2c
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endif # CONFIG_I2C
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