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drivers/analog: Add driver for the LTC1767L ADC.

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This commit is contained in:
Martin Lederhilger 2017-03-28 06:34:37 -06:00 committed by Gregory Nutt
parent 65e95b95f2
commit 91f96b6ecb
4 changed files with 540 additions and 0 deletions
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19
drivers/analog/Kconfig
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@ -66,6 +66,25 @@ config ADS1255_FREQUENCY
endif # ADC_ADS125X
config ADC_LTC1867L
bool "LTC 1863L/1867L support"
default n
select SPI
---help---
Enable driver support for the LTC 1863L (12 bit) and LTC 1867L (16 bit) SPI powered ADC.
Note that the ADC conversion is started via the ANIOC_TRIGGER iotcl.
if ADC_LTC1867L
config LTC1867L_FREQUENCY
int "LTC 1863L/1867L SPI frequency"
default 1000000
---help---
LTC 1863L/1867L SPI frequency. Maximum is 20 MHz.
endif # ADC_LTC1867L
config ADC_PGA11X
bool "TI PGA112/3/6/7 support"
default n

4
drivers/analog/Make.defs
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@ -83,6 +83,10 @@ endif
ifeq ($(CONFIG_ADC_ADS125X),y)
CSRCS += ads1255.c
endif
ifeq ($(CONFIG_ADC_LTC1867L),y)
CSRCS += ltc1867l.c
endif
endif
# Add analog driver build support (the nested if-then-else implements an OR)

380
drivers/analog/ltc1867l.c Normal file
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@ -0,0 +1,380 @@
/****************************************************************************
* arch/drivers/analog/ltc1867l.c
*
* Copyright (C) 2017 DS-Automotion GmbH. All rights reserved.
* Author: Martin Lederhilger <m.lederhilger@ds-automotion.com>
*
* This file is a part of NuttX:
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
*
* 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 <sys/ioctl.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <semaphore.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/analog/adc.h>
#include <nuttx/analog/ioctl.h>
#include <nuttx/analog/ltc1867l.h>
#if defined(CONFIG_ADC_LTC1867L)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Device uses SPI Mode 1: CKPOL = 0, CKPHA = 0 */
#define LTC1867L_SPI_MODE (SPIDEV_MODE0)
/****************************************************************************
* Private Types
****************************************************************************/
struct ltc1867l_dev_s
{
FAR const struct adc_callback_s *cb;
FAR struct spi_dev_s *spi;
unsigned int devno;
FAR struct ltc1867l_channel_config_s *channel_config;
int channel_config_count;
sem_t sem;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void adc_lock(FAR struct spi_dev_s *spi);
static void adc_unlock(FAR struct spi_dev_s *spi);
/* ADC methods */
static int adc_bind(FAR struct adc_dev_s *dev,
FAR const struct adc_callback_s *callback);
static void adc_reset(FAR struct adc_dev_s *dev);
static int adc_setup(FAR struct adc_dev_s *dev);
static void adc_shutdown(FAR struct adc_dev_s *dev);
static void adc_rxint(FAR struct adc_dev_s *dev, bool enable);
static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct adc_ops_s g_adcops =
{
.ao_bind = adc_bind, /* ao_bind */
.ao_reset = adc_reset, /* ao_reset */
.ao_setup = adc_setup, /* ao_setup */
.ao_shutdown = adc_shutdown, /* ao_shutdown */
.ao_rxint = adc_rxint, /* ao_rxint */
.ao_ioctl = adc_ioctl /* ao_read */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: adc_lock
*
* Description:
* Lock and configure the SPI bus.
*
****************************************************************************/
static void adc_lock(FAR struct spi_dev_s *spi)
{
(void)SPI_LOCK(spi, true);
SPI_SETMODE(spi, LTC1867L_SPI_MODE);
SPI_SETBITS(spi, 16);
(void)SPI_HWFEATURES(spi, 0);
SPI_SETFREQUENCY(spi, CONFIG_LTC1867L_FREQUENCY);
}
/****************************************************************************
* Name: adc_unlock
*
* Description:
* Unlock the SPI bus.
*
****************************************************************************/
static void adc_unlock(FAR struct spi_dev_s *spi)
{
(void)SPI_LOCK(spi, false);
}
/****************************************************************************
* Name: adc_bind
*
* Description:
* Bind the upper-half driver callbacks to the lower-half implementation. This
* must be called early in order to receive ADC event notifications.
*
****************************************************************************/
static int adc_bind(FAR struct adc_dev_s *dev,
FAR const struct adc_callback_s *callback)
{
FAR struct ltc1867l_dev_s *priv = (FAR struct ltc1867l_dev_s *)dev->ad_priv;
priv->cb = callback;
return OK;
}
/****************************************************************************
* Name: adc_reset
*
* Description:
* Reset the ADC device. Called early to initialize the hardware. This
* is called, before ao_setup() and on error conditions.
*
****************************************************************************/
static void adc_reset(FAR struct adc_dev_s *dev)
{
}
/****************************************************************************
* Name: adc_setup
*
* Description:
* Configure the ADC. This method is called the first time that the ADC
* device is opened. This will occur when the port is first opened.
* This setup includes configuring and attaching ADC interrupts. Interrupts
* are all disabled upon return.
*
****************************************************************************/
static int adc_setup(FAR struct adc_dev_s *dev)
{
return OK;
}
/****************************************************************************
* Name: adc_shutdown
*
* Description:
* Disable the ADC. This method is called when the ADC device is closed.
* This method reverses the operation the setup method.
*
****************************************************************************/
static void adc_shutdown(FAR struct adc_dev_s *dev)
{
}
/****************************************************************************
* Name: adc_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void adc_rxint(FAR struct adc_dev_s *dev, bool enable)
{
}
/****************************************************************************
* Name: adc_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg)
{
FAR struct ltc1867l_dev_s *priv = (FAR struct ltc1867l_dev_s *)dev->ad_priv;
FAR struct spi_dev_s *spi = priv->spi;
int i;
uint16_t command;
uint16_t data;
int32_t dataToPost;
int ret = OK;
if(cmd == ANIOC_TRIGGER)
{
while (sem_wait(&priv->sem) != OK);
adc_lock(spi);
for (i = 0; i <= priv->channel_config_count; i++)
{
SPI_SELECT(spi, priv->devno, true);
if (i < priv->channel_config_count)
{
command = priv->channel_config[i].analog_multiplexer_config |
priv->channel_config[i].analog_inputMode;
command = command << 8;
}
else
{
command = 0;
}
data = SPI_SEND(spi, command);
up_udelay(2);
SPI_SELECT(spi, priv->devno, false);
up_udelay(4);
if (i > 0)
{
if (priv->channel_config[i-1].analog_inputMode == LTC1867L_UNIPOLAR ||
(priv->channel_config[i-1].analog_inputMode == LTC1867L_BIPOLAR &&
data >= 0 && data <= 0x7fff))
{
dataToPost = data;
}
else
{
dataToPost = -(0xffff - data) - 1;
}
priv->cb->au_receive(dev, priv->channel_config[i-1].channel, dataToPost);
}
}
adc_unlock(spi);
sem_post(&priv->sem);
}
else
{
aerr("ERROR: Unrecognized cmd: %d\n", cmd);
ret = -ENOTTY;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ltc1867l_register
*
* Description:
* Register the LTC1867L character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/adc0"
* spi - An instance of the SPI interface to use to communicate with
* LTC1867L
* devno - SPI device number
* channel_config - A pointer to an array which holds the configuration
* for each sampled channel.
* channel_config_count - Number of channels to sample
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int ltc1867l_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
unsigned int devno,
FAR struct ltc1867l_channel_config_s* channel_config,
int channel_config_count)
{
FAR struct ltc1867l_dev_s *adcpriv;
FAR struct adc_dev_s *adcdev;
int ret;
/* Sanity check */
DEBUGASSERT(spi != NULL);
DEBUGASSERT(channel_config != NULL);
/* Initialize the LTC1867L device structure */
adcpriv = (FAR struct ltc1867l_dev_s *)kmm_malloc(sizeof(struct ltc1867l_dev_s));
if (adcpriv == NULL)
{
aerr("ERROR: Failed to allocate ltc1867l_dev_s instance\n");
return -ENOMEM;
}
adcpriv->spi = spi;
adcpriv->devno = devno;
adcpriv->channel_config = channel_config;
adcpriv->channel_config_count = channel_config_count;
ret = sem_init(&adcpriv->sem, 1, 1);
if(ret == -1)
{
kmm_free(adcpriv);
return -errno;
}
adcdev = (FAR struct adc_dev_s *)kmm_malloc(sizeof(struct adc_dev_s));
if (adcdev == NULL)
{
aerr("ERROR: Failed to allocate adc_dev_s instance\n");
sem_destroy(&adcpriv->sem);
kmm_free(adcpriv);
return -ENOMEM;
}
memset(adcdev, 0, sizeof(struct adc_dev_s));
adcdev->ad_ops = &g_adcops;
adcdev->ad_priv = adcpriv;
/* Register the character driver */
ret = adc_register(devpath, adcdev);
if (ret < 0)
{
aerr("ERROR: Failed to register adc driver: %d\n", ret);
kmm_free(adcdev);
sem_destroy(&adcpriv->sem);
kmm_free(adcpriv);
}
return ret;
}
#endif

137
include/nuttx/analog/ltc1867l.h Normal file
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@ -0,0 +1,137 @@
/****************************************************************************
* include/nuttx/sensors/ltc1867l.h
*
* Copyright (C) 2017 DS-Automotion GmbH. All rights reserved.
* Author: Martin Lederhilger <m.lederhilger@ds-automotion.com>
*
* 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_LTC1867L_H
#define __INCLUDE_NUTTX_ANALOG_LTC1867L_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/spi/spi.h>
#include <stdint.h>
#if defined(CONFIG_ADC_LTC1867L)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* LTC1867L Configuration *******************************************/
#define LTC1867L_CONFIG_BIT_SLP (1 << 1)
#define LTC1867L_CONFIG_BIT_UNI (1 << 2)
#define LTC1867L_CONFIG_BIT_COM (1 << 3)
#define LTC1867L_CONFIG_BIT_S0 (1 << 4)
#define LTC1867L_CONFIG_BIT_S1 (1 << 5)
#define LTC1867L_CONFIG_BIT_OS (1 << 6)
#define LTC1867L_CONFIG_BIT_SD (1 << 7)
/****************************************************************************
* Public Types
****************************************************************************/
enum ltc1867l_analog_multiplexer_config_e
{
LTC1867L_P_CH0_M_CH1 = 0,
LTC1867L_P_CH2_M_CH3 = LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH4_M_CH5 = LTC1867L_CONFIG_BIT_S1,
LTC1867L_P_CH6_M_CH7 = LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH1_M_CH0 = LTC1867L_CONFIG_BIT_OS,
LTC1867L_P_CH3_M_CH2 = LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH5_M_CH4 = LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S1,
LTC1867L_P_CH7_M_CH6 = LTC1867L_CONFIG_BIT_OS |LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH0_M_GND = LTC1867L_CONFIG_BIT_SD,
LTC1867L_P_CH2_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH4_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_S1,
LTC1867L_P_CH6_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH1_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS,
LTC1867L_P_CH3_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH5_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S1,
LTC1867L_P_CH7_M_GND = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_S0,
LTC1867L_P_CH0_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_COM,
LTC1867L_P_CH2_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_S0 | LTC1867L_CONFIG_BIT_COM,
LTC1867L_P_CH4_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_COM,
LTC1867L_P_CH6_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_S0 | LTC1867L_CONFIG_BIT_COM,
LTC1867L_P_CH1_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_COM,
LTC1867L_P_CH3_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S0 | LTC1867L_CONFIG_BIT_COM,
LTC1867L_P_CH5_M_CH7COM = LTC1867L_CONFIG_BIT_SD | LTC1867L_CONFIG_BIT_OS | LTC1867L_CONFIG_BIT_S1 | LTC1867L_CONFIG_BIT_COM
};
enum ltc1867l_analog_input_mode_e
{
LTC1867L_UNIPOLAR = LTC1867L_CONFIG_BIT_UNI,
LTC1867L_BIPOLAR = 0,
};
struct ltc1867l_channel_config_s
{
uint8_t channel; /* This will be the channel number returned in struct adc_msg_s for a conversion */
enum ltc1867l_analog_multiplexer_config_e analog_multiplexer_config; /* Analog multiplexer configuration */
enum ltc1867l_analog_input_mode_e analog_inputMode; /* Analog input mode */
} packed_struct;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: ltc1867l_register
*
* Description:
* Register the LTC1867L character device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/adc0"
* spi - An instance of the SPI interface to use to communicate with
* LTC1867L
* devno - SPI device number
* channel_config - A pointer to an array which holds the configuration
* for each sampled channel.
* channel_config_count - Number of channels to sample
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int ltc1867l_register(FAR const char *devpath, FAR struct spi_dev_s *spi,
unsigned int devno,
FAR struct ltc1867l_channel_config_s* channel_config,
int channel_config_count);
#endif /* CONFIG_ADC_LTC1867L */
#endif /* __INCLUDE_NUTTX_ANALOG_LTC1867L_H */