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Merged in ordsen/nuttx/feature-pca9540bdp-i2cmultiplexer (pull request #610)
Feature pca9540bdp i2cmultiplexer * Implement common i2c multiplexer abstraction to be reused by i2c multiplexer devices. Provide common interface with transfer and reset calls to set up virtual i2c busses. * Remove i2cmux_lower_half.c and headers, will be implemented by each mux driver * Implement PCA9540BDP I2C multiplexer lower half which uses the common i2c mux abstraction * Remove application interface and implement common i2c functions * Remove application interface from pca driver and implement common i2c functions directly in the pca driver * Use i2cerr Approved-by: Gregory Nutt <gnutt@nuttx.org>
This commit is contained in:
Giorgio Groß
committed by
Gregory Nutt
Gregory Nutt
parent
628821fdf4
commit
4d78593a0f
@@ -36,4 +36,17 @@ config I2C_DRIVER
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this driver is to support I2C testing. It is not suitable for use
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in any real driver application.
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menu "I2C Multiplexer Support"
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config I2CMULTIPLEXER_PCA9540BDP
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bool "PCA9540BDP NXP multiplexer"
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default n
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depends on I2C
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---help---
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Enable support for the NXP PCA9540BDP i2c multiplexer
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# put more i2c mux devices here
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endmenu # I2C Multiplexer Support
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endif # I2C
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+10
-3
@@ -1,8 +1,9 @@
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############################################################################
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# drivers/i2c/Make.defs
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#
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# Copyright (C) 2016 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <gnutt@nuttx.org>
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# Copyright (C) 2016, 2018 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <gnutt@nuttx.org>,
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# Giorgio Gross <giorgio.gross@robodev.eu>
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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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@@ -43,10 +44,16 @@ ifeq ($(CONFIG_I2C_DRIVER),y)
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CSRCS += i2c_driver.c
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endif
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# Include the selected I2C multiplexer drivers
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ifeq ($(CONFIG_I2CMULTIPLEXER_PCA9540BDP),y)
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CSRCS += pca9540bdp.c
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endif
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# 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 += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(TOPDIR)$(DELIM)drivers$(DELIM)i2c}
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endif
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endif # CONFIG_I2C
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@@ -0,0 +1,295 @@
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/****************************************************************************
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* drivers/i2c/pca9540bdp.c
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* Driver for the PCA9540BDP i2c multiplexer
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*
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* Copyright (C) 2018 Giorgio Groß. All rights reserved.
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* Author: Giorgio Groß <giorgio.gross@robodev.eu>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <fixedmath.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/i2c/i2c_master.h>
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#include "pca9540bdp.h"
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#include <nuttx/i2c/pca9540bdp.h>
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#ifdef CONFIG_I2CMULTIPLEXER_PCA9540BDP
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C Helpers */
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static int pca9540bdp_write_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t regvalue);
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static int pca9540bdp_read_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t *regvalue);
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/* Other helpers */
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static int pca9540bdp_select_port(FAR struct pca9540bdp_dev_s *priv, uint8_t val);
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/* I2C multiplexer vtable */
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static int pca9540bdp_transfer_on_port (FAR struct i2c_master_s *dev,
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FAR struct i2c_msg_s *msgs, int count);
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#ifdef CONFIG_I2C_RESET
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static int pca9540bdp_reset_on_port (FAR struct i2c_master_s *dev);
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct i2c_ops_s g_i2cmux_ops =
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{
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pca9540bdp_transfer_on_port
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#ifdef CONFIG_I2C_RESET
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, pca9540bdp_reset_on_port
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int pca9540bdp_write_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t regvalue)
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{
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struct i2c_config_s iconf;
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iconf.frequency = CONFIG_PCA9549BDP_I2C_FREQUENCY;
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iconf.address = priv->addr;
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iconf.addrlen = 7;
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int ret = i2c_write(priv->i2c, &iconf, ®value, 1);
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i2cinfo("Write to address 0x%02X; register value: 0x%02x ret: %d\n", priv->addr, regvalue, ret);
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return ret;
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}
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static int pca9540bdp_read_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t *regvalue)
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{
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struct i2c_config_s iconf;
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iconf.frequency = CONFIG_PCA9549BDP_I2C_FREQUENCY;
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iconf.address = priv->addr;
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iconf.addrlen = 7;
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int ret = i2c_read(priv->i2c, &iconf, regvalue, 1);
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i2cinfo("Read from address: 0x%02X; register value: 0x%02x ret: %d\n", priv->addr, *regvalue, ret);
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return ret;
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}
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static int pca9540bdp_select_port(FAR struct pca9540bdp_dev_s *priv, uint8_t val)
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{
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if(val != PCA9540BDP_SEL_PORT0 && val != PCA9540BDP_SEL_PORT1)
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{
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/* port not supported */
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return -EINVAL;
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}
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if((PCA9540BDP_ENABLE | val) == priv->state)
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{
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/* port already selected */
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return OK;
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}
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/* modify state and write it to the mux */
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priv->state = PCA9540BDP_ENABLE | val; /* selecting a port always enables the device */
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return (pca9540bdp_write_config(priv, priv->state) == 0) ? OK : -ECOMM;
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}
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static int pca9540bdp_transfer_on_port (FAR struct i2c_master_s* dev,
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FAR struct i2c_msg_s *msgs, int count)
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{
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FAR struct i2c_port_dev_s* port_dev = (struct i2c_port_dev_s*) dev;
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FAR struct pca9540bdp_dev_s* priv = port_dev->dev;
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/* select the mux port */
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if(pca9540bdp_select_port(priv, port_dev->port) != OK)
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{
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i2cerr("Could not select proper mux port\n");
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return -ECOMM; /* signal error condition */
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}
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/* resume the i2c transfer to the device connected to the mux port */
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int ret = I2C_TRANSFER(priv->i2c, msgs, count);
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i2cinfo("Selected port %d and resumed transfer. Result: %d\n", port_dev->port, ret);
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return ret;
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}
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#ifdef CONFIG_I2C_RESET
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static int pca9540bdp_reset_on_port (FAR struct i2c_master_s *dev)
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{
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FAR struct i2c_port_dev_s* port_dev = (struct i2c_port_dev_s*) dev;
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FAR struct pca9540bdp_dev_s* priv = port_dev->dev;
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int port = port_dev->port;
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/* select the mux port */
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if(pca9540bdp_select_port(priv, port) != OK)
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{
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i2cerr("Could not select proper mux port\n");
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return -ECOMM; /* signal error condition */
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}
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/* resume the i2c reset for the device connected to the mux port */
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int ret = I2C_RESET(priv->i2c);
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return ret;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pca9540bdp_lower_half
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*
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* Description:
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* Initialize the lower half of the PCA9540BDP by creating a i2c_master_s
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* for the virtual i2c master and link it to the associated PCA9540BDP and
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* its port.
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*
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* Input Parameters:
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* dev - Pointer to the associated PCA9540BDP
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* port - The port number as defined in pca9540bdp.h
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*
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* Returned Value:
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* Common i2c multiplexer device instance; NULL on failure.
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*
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****************************************************************************/
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FAR struct i2c_master_s* pca9540bdp_lower_half(FAR struct pca9540bdp_dev_s *dev,
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uint8_t port)
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{
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FAR struct i2c_port_dev_s *port_dev;
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/* Sanity check */
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DEBUGASSERT(dev != NULL);
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/* Initialize the i2c_port_dev_s device structure */
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port_dev = (FAR struct i2c_port_dev_s *)kmm_malloc(sizeof(struct i2c_port_dev_s));
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if (port_dev == NULL)
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{
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i2cerr("ERROR: Failed to allocate i2c port lower half instance\n");
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return NULL;
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}
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/* set vi2c ops to their implementations */
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port_dev->vi2c.ops = &g_i2cmux_ops;
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/* save state variables */
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port_dev->dev = dev;
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port_dev->port = port;
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return &port_dev->vi2c;
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}
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/****************************************************************************
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* Name: pca9540bdp_initialize
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*
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* Description:
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* Initialize the PCA9540BDP device.
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*
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* Input Parameters:
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* i2c - An instance of the I2C interface to use to communicate with PCA9540BDP
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* addr - The I2C address of the PCA9540BDP. The base I2C address of the PCA9540BDP
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* is 0x70.
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*
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* Returned Value:
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* Common i2c multiplexer device instance; NULL on failure.
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*
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****************************************************************************/
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FAR struct pca9540bdp_dev_s* pca9540bdp_initialize(FAR struct i2c_master_s *i2c,
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uint8_t addr)
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{
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FAR struct pca9540bdp_dev_s *priv;
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/* Sanity check */
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DEBUGASSERT(i2c != NULL);
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/* Initialize the PCA9549BDP device structure */
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priv = (FAR struct pca9540bdp_dev_s *)kmm_malloc(sizeof(struct pca9540bdp_dev_s));
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if (priv == NULL)
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{
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i2cerr("ERROR: Failed to allocate instance\n");
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return NULL;
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}
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priv->i2c = i2c;
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priv->addr = addr;
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priv->state = 0x00;
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if(pca9540bdp_read_config(priv, &priv->state) != OK)
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{
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i2cerr("Could not read initial state from the device\n");
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kmm_free(priv);
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return NULL; /* signal error condition */
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}
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i2cinfo("Initial device state: %d\n", priv->state);
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if(pca9540bdp_select_port(priv, PCA9540BDP_SEL_PORT0) != OK)
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{
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i2cerr("Could not select mux port 0\n");
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kmm_free(priv);
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return NULL; /* signal error condition */
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}
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i2cinfo("PCA9549BDP (addr=0x%02x) set up with port %d\n", priv->addr, PCA9540BDP_SEL_PORT0);
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return priv;
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}
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#endif /* CONFIG_I2CMULTIPLEXER_PCA9540BDP */
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@@ -0,0 +1,89 @@
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/****************************************************************************
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* /nuttx/drivers/i2c/pca9540bdp.h
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*
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* Copyright (C) 2018 Giorgio Groß. All rights reserved.
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* Author: Giorgio Groß <giorgio.gross@robodev.eu>
|
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*
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* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
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****************************************************************************/
|
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#ifndef __DRIVERS_I2C_PCA9540BDP_H
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#define __DRIVERS_I2C_PCA9540BDP_H
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/****************************************************************************
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* Included Files
|
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/i2c/i2c_master.h>
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#ifdef CONFIG_I2CMULTIPLEXER_PCA9540BDP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_PCA9549BDP_I2C_FREQUENCY
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# define CONFIG_PCA9549BDP_I2C_FREQUENCY 400000 /* 400 khz */
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#endif
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/* Bit Definitions to be passed to write calls */
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#define PCA9540BDP_ENABLE 0x4
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#define PCA9540BDP_DISABLE 0x0
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/* Bit masks */
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#define PCA9540BDP_CH_BITMASK 0x03
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#define PCA9540BDP_ENABLE_BITMASK 0x04
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#define PCA9540BDP_CH_BIT 0
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#define PCA9540BDP_CH_NONE_BIT 1
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#define PCA9540BDP_ENABLE_BIT 2
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/****************************************************************************
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* Public Types
|
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****************************************************************************/
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struct pca9540bdp_dev_s
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{
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint16_t addr;
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uint8_t state; /* control register state */
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};
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struct i2c_port_dev_s
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{
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FAR struct i2c_master_s vi2c; /* Nested structure to allow casting as
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public i2c master */
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uint8_t port; /* associated port on the mux */
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FAR struct pca9540bdp_dev_s* dev; /* associated device */
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};
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#endif /* CONFIG_I2CMULTIPLEXER_PCA9540BDP */
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#endif /* __DRIVERS_I2CMULTIPLEXER_PCA9540BDP_H */
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@@ -0,0 +1,124 @@
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/****************************************************************************
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||||
* include/nuttx/i2c/pca9540bdp.h
|
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*
|
||||
* Copyright (C) 2018 Giorgio Groß. All rights reserved.
|
||||
* Author: Giorgio Groß <giorgio.gross@robodev.eu>
|
||||
*
|
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* References:
|
||||
* "PCA9540B 2-channel I2C-bus multiplexer product datasheet",
|
||||
* 31 October 2016, NXP
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef __INCLUDE_I2C_PCA9540BDP_H
|
||||
#define __INCLUDE_I2C_PCA9540BDP_H
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <nuttx/i2c/i2c_master.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
#ifndef CONFIG_PCA9540BDP_BASEADDR
|
||||
# define CONFIG_PCA9540BDP_BASEADDR 0x70
|
||||
#endif
|
||||
|
||||
#define PCA9540BDP_SEL_PORT0 0x0
|
||||
#define PCA9540BDP_SEL_PORT1 0x1
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
struct pca9540bdp_dev_s;
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
#define EXTERN extern "C"
|
||||
extern "C"
|
||||
{
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
|
||||
/****************************************************************************
|
||||
* Name: pca9540bdp_lower_half
|
||||
*
|
||||
* Description:
|
||||
* Initialize the lower half of the PCA9540BDP by creating a i2c_master_s
|
||||
* for the virtual i2c master and link it to the associated PCA9540BDP and
|
||||
* its port.
|
||||
*
|
||||
* Input Parameters:
|
||||
* dev - Pointer to the associated PCA9540BDP
|
||||
* port - The port number as defined in pca9540bdp.h
|
||||
*
|
||||
* Returned Value:
|
||||
* Common i2c multiplexer device instance; NULL on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct i2c_master_s* pca9540bdp_lower_half(FAR struct pca9540bdp_dev_s *dev,
|
||||
uint8_t port);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: pca9540bdp_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the PCA9540BDP device.
|
||||
*
|
||||
* Input Parameters:
|
||||
* i2c - An instance of the I2C interface to use to communicate with PCA9540BDP
|
||||
* addr - The I2C address of the PCA9540BDP. The base I2C address of the PCA9540BDP
|
||||
* is 0x70.
|
||||
*
|
||||
* Returned Value:
|
||||
* Common i2c multiplexer device instance; NULL on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct pca9540bdp_dev_s* pca9540bdp_initialize(FAR struct i2c_master_s *i2c,
|
||||
uint8_t addr);
|
||||
|
||||
#undef EXTERN
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* __INCLUDE_I2C_PCA9540BDP_H */
|
||||
Reference in New Issue
Block a user