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drivers/analog: Add basic OPAMP driver

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This commit is contained in:
raiden00pl 2017-04-30 11:11:17 +02:00
parent e4d47d61cc
commit 0b6190c1c4
4 changed files with 375 additions and 0 deletions
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6
drivers/analog/Kconfig
View File

@ -141,3 +141,9 @@ config DAC_AD5410
select SPI
endif # DAC
config OPAMP
bool "Operational Amplifier"
default n
---help---
Select to enable support for Operational Amplifiers (OPAMPs).

17
drivers/analog/Make.defs
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@ -60,6 +60,16 @@ CSRCS += comp.c
endif
# Check for OPAMP devices
ifeq ($(CONFIG_OPAMP),y)
# Include the common OPAMP character driver
CSRCS += opamp.c
endif
# Check for ADC devices
ifeq ($(CONFIG_ADC),y)
@ -105,6 +115,13 @@ ifeq ($(CONFIG_COMP),y)
DEPPATH += --dep-path analog
VPATH += :analog
CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(TOPDIR)$(DELIM)drivers$(DELIM)analog}
else
ifeq ($(CONFIG_OPAMP),y)
DEPPATH += --dep-path analog
VPATH += :analog
CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(TOPDIR)$(DELIM)drivers$(DELIM)analog}
endif
endif
endif
endif

243
drivers/analog/opamp.c Normal file
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@ -0,0 +1,243 @@
/****************************************************************************
* drivers/analog/opamp.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Mateusz Szafoni <raiden00@railab.me>
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <unistd.h>
#include <semaphore.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/semaphore.h>
#include <nuttx/fs/fs.h>
#include <nuttx/analog/opamp.h>
#include <nuttx/irq.h>
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int opamp_open(FAR struct file *filep);
static int opamp_close(FAR struct file *filep);
static int opamp_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations opamp_fops =
{
opamp_open, /* open */
opamp_close, /* close */
NULL, /* read */
NULL, /* write */
NULL, /* seek */
opamp_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, NULL /* poll */
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: opamp_open
*
* Description:
* This function is called whenever the OPAMP device is opened.
*
****************************************************************************/
static int opamp_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct opamp_dev_s *dev = inode->i_private;
uint8_t tmp;
int ret = OK;
/* If the port is the middle of closing, wait until the close is finished */
if (sem_wait(&dev->ad_closesem) != OK)
{
ret = -errno;
}
else
{
/* Increment the count of references to the device. If this the first
* time that the driver has been opened for this device, then initialize
* the device.
*/
tmp = dev->ad_ocount + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
}
else
{
/* Check if this is the first time that the driver has been opened. */
if (tmp == 1)
{
/* Yes.. perform one time hardware initialization. */
irqstate_t flags = enter_critical_section();
ret = dev->ad_ops->ao_setup(dev);
if (ret == OK)
{
/* Save the new open count on success */
dev->ad_ocount = tmp;
}
leave_critical_section(flags);
}
}
sem_post(&dev->ad_closesem);
}
return ret;
}
/****************************************************************************
* Name: opamp_close
*
* Description:
* This routine is called when the OPAMP device is closed.
* It waits for the last remaining data to be sent.
*
****************************************************************************/
static int opamp_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct opamp_dev_s *dev = inode->i_private;
irqstate_t flags;
int ret = OK;
if (sem_wait(&dev->ad_closesem) != OK)
{
ret = -errno;
}
else
{
/* Decrement the references to the driver. If the reference count will
* decrement to 0, then uninitialize the driver.
*/
if (dev->ad_ocount > 1)
{
dev->ad_ocount--;
sem_post(&dev->ad_closesem);
}
else
{
/* There are no more references to the port */
dev->ad_ocount = 0;
/* Free the IRQ and disable the OPAMP device */
flags = enter_critical_section(); /* Disable interrupts */
dev->ad_ops->ao_shutdown(dev); /* Disable the OPAMP */
leave_critical_section(flags);
sem_post(&dev->ad_closesem);
}
}
return ret;
}
/****************************************************************************
* Name: opamp_ioctl
****************************************************************************/
static int opamp_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct opamp_dev_s *dev = inode->i_private;
int ret;
ret = dev->ad_ops->ao_ioctl(dev, cmd, arg);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: opamp_register
****************************************************************************/
int opamp_register(FAR const char *path, FAR struct opamp_dev_s *dev)
{
int ret;
/* Initialize the OPAMP device structure */
dev->ad_ocount = 0;
/* Initialize semaphores */
sem_init(&dev->ad_closesem, 0, 1);
/* Register the OPAMP character driver */
ret = register_driver(path, &opamp_fops, 0444, dev);
if (ret < 0)
{
sem_destroy(&dev->ad_closesem);
}
return ret;
}

109
include/nuttx/analog/opamp.h Normal file
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@ -0,0 +1,109 @@
/************************************************************************************
* include/nuttx/analog/opamp.h
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Mateusz Szafoni <raiden00@railab.me>
*
* 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_NUTTX_ANALOG_OPAMP_H
#define __INCLUDE_NUTTX_ANALOG_OPAMP_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <nuttx/fs/fs.h>
/************************************************************************************
* Public Types
************************************************************************************/
struct opamp_dev_s;
struct opamp_ops_s
{
/* Configure the OPAMP. This method is called the first time that the OPAMP
* device is opened. This will occur when the port is first opened.
* This setup includes configuring and attaching OPAMP interrupts. Interrupts
* are all disabled upon return.
*/
CODE int (*ao_setup)(FAR struct opamp_dev_s *dev);
/* Disable the OPAMP. This method is called when the OPAMP device is closed.
* This method reverses the operation the setup method.
* Works only if OPAMP device is not locked.
*/
CODE void (*ao_shutdown)(FAR struct opamp_dev_s *dev);
/* All ioctl calls will be routed through this method */
CODE int (*ao_ioctl)(FAR struct opamp_dev_s *dev, int cmd, unsigned long arg);
};
struct opamp_dev_s
{
#ifdef CONFIG_OPAMP
/* Fields managed by common upper half OPAMP logic */
uint8_t ad_ocount; /* The number of times the device has been opened */
sem_t ad_closesem; /* Locks out new opens while close is in progress */
#endif
/* Fields provided by lower half OPAMP logic */
FAR const struct opamp_ops_s *ad_ops; /* Arch-specific operations */
FAR void *ad_priv; /* Used by the arch-specific logic */
};
/************************************************************************************
* Public Functions
************************************************************************************/
#if defined(__cplusplus)
extern "C"
{
#endif
int opamp_register(FAR const char *path, FAR struct opamp_dev_s *dev);
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_NUTTX_ANALOG_OPAMP_H */