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ioexpander: add support for pcf8575 expander

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This adds support for 16 bit io expander pcf8575. The driver is basically
the same as for pcf8574 however it is for 16 bits instead of 8 bits. Since
pcf8575 and pcf8574 can be both used on the same i2c bus the driver for
pcf8575 is implemented in a different file to reduce the code size
and complexity and to have less if statements in the driver.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc
2023-08-01 16:25:06 +02:00
committed by Xiang Xiao
parent 580d09b5a1
commit bf90361895
5 changed files with 865 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/ioexpander/Kconfig
+19
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@@ -297,6 +297,25 @@ config PCF8574_INT_POLLDELAY
endif # IOEXPANDER_PCF8574
config IOEXPANDER_PCF8575
bool "PCF8575 I2C IO expander"
default n
depends on I2C
---help---
Enable support for 16 bit PCF8575 IO Expander. Software driver
interrupt is currently not supported therefore decated HW interrupt
pin should be used.
if IOEXPANDER_PCF8575
config PCF8575_MULTIPLE
bool "Multiple PCF8575 Devices"
default n
---help---
Can be defined to support multiple PCF8575 devices on board.
endif # IOEXPANDER_PCF8575
config IOEXPANDER_SX1509
bool "SX1509 I2C IO expander"
default n
drivers/ioexpander/Make.defs
+4
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@@ -48,6 +48,10 @@ ifeq ($(CONFIG_IOEXPANDER_PCF8574),y)
CSRCS += pcf8574.c
endif
ifeq ($(CONFIG_IOEXPANDER_PCF8575),y)
CSRCS += pcf8575.c
endif
ifeq ($(CONFIG_IOEXPANDER_MCP23X17),y)
CSRCS += mcp23x17.c
endif
drivers/ioexpander/pcf8575.c
+681
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File diff suppressed because it is too large Load Diff
drivers/ioexpander/pcf8575.h
+82
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@@ -0,0 +1,82 @@
/****************************************************************************
* drivers/ioexpander/pcf8575.h
*
* 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.
*
****************************************************************************/
#ifndef __DRIVERS_IOEXPANDER_PCF8575_H
#define __DRIVERS_IOEXPANDER_PCF8575_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/mutex.h>
#include <nuttx/ioexpander/ioexpander.h>
#include <nuttx/ioexpander/pcf8575.h>
#include <nuttx/i2c/i2c_master.h>
#if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_PCF8575)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Prerequisites:
* CONFIG_I2C
* I2C support is required
* CONFIG_IOEXPANDER
* Enables I/O expander support
*
* CONFIG_IOEXPANDER_PCF8575
* Enables support for the PCF8575 driver (Needs CONFIG_INPUT)
* CONFIG_PCF8575_MULTIPLE
* Can be defined to support multiple PCF8575 devices on board.
*/
#ifndef CONFIG_I2C
# error "CONFIG_I2C is required by PCF8575"
#endif
/* PCF8575 Definitions ******************************************************/
#define PCF8575_I2C_MAXFREQUENCY 400000 /* 400KHz */
/****************************************************************************
* Public Types
****************************************************************************/
/* This structure represents the state of the PCF8575 driver */
struct pcf8575_dev_s
{
struct ioexpander_dev_s dev; /* Nested structure to allow casting as public gpio
* expander. */
FAR struct pcf8575_config_s *config; /* Board configuration data */
FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
mutex_t lock; /* Mutual exclusion */
uint16_t inpins; /* Set of input pins */
uint16_t outstate; /* State of all output pins */
};
#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCF8575 */
#endif /* __DRIVERS_IOEXPANDER_PCF8575_H */
include/nuttx/ioexpander/pcf8575.h
+79
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@@ -0,0 +1,79 @@
/****************************************************************************
* include/nuttx/ioexpander/pcf8575.h
*
* 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.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_IOEXPANDER_PCF8575_H
#define __INCLUDE_NUTTX_IOEXPANDER_PCF8575_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
/****************************************************************************
* Public Types
****************************************************************************/
/* A reference to a structure of this type must be passed to the PCF8575xx
* driver when the driver is instantiated. This structure provides
* information about the configuration of the PCF8575xx and provides some
* board-specific hooks.
*
* Memory for this structure is provided by the caller. It is not copied by
* the driver and is presumed to persist while the driver is active. The
* memory must be writeable because, under certain circumstances, the driver
* may modify the frequency.
*/
struct pcf8575_config_s
{
/* Device characterization */
uint8_t address; /* 7-bit I2C address (only bits 0-6 used) */
uint32_t frequency; /* I2C frequency */
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: pcf8575_initialize
*
* Description:
* Instantiate and configure the PCF8575xx device driver to use the
* provided I2C device instance.
*
* Input Parameters:
* i2c - An I2C driver instance
* minor - The device i2c address
* config - Persistent board configuration data
*
* Returned Value:
* an ioexpander_dev_s instance on success, NULL on failure.
*
****************************************************************************/
struct i2c_master_s;
FAR struct ioexpander_dev_s *pcf8575_initialize(FAR struct i2c_master_s *i2c,
FAR struct pcf8575_config_s *config);
#endif /* __INCLUDE_NUTTX_IOEXPANDER_PCF8575_H */