245 lines
9.2 KiB
C
245 lines
9.2 KiB
C
/************************************************************************************
|
|
* include/nuttx/analog/adc.h
|
|
*
|
|
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
|
|
* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
|
|
* Author: Li Zhuoyi <lzyy.cn@gmail.com>
|
|
* Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Derived from include/nuttx/can.h
|
|
*
|
|
* Copyright (C) 2008, 2009 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* 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_ADC_H
|
|
#define __INCLUDE_NUTTX_ANALOG_ADC_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>
|
|
#include <nuttx/spi/spi.h>
|
|
|
|
/************************************************************************************
|
|
* Pre-processor Definitions
|
|
************************************************************************************/
|
|
|
|
/* Default configuration settings that may be overridden in the NuttX configuration
|
|
* file. The configured size is limited to 255 to fit into a uint8_t.
|
|
*/
|
|
|
|
#if !defined(CONFIG_ADC_FIFOSIZE)
|
|
# define CONFIG_ADC_FIFOSIZE 8
|
|
#elif CONFIG_ADC_FIFOSIZE > 255
|
|
# undef CONFIG_ADC_FIFOSIZE
|
|
# define CONFIG_ADC_FIFOSIZE 255
|
|
#endif
|
|
|
|
/************************************************************************************
|
|
* Public Types
|
|
************************************************************************************/
|
|
/* These are callbacks to notify the upper-half driver of ADC events */
|
|
|
|
struct adc_dev_s;
|
|
struct adc_callback_s
|
|
{
|
|
/* This method is called from the lower half, platform-specific ADC logic when
|
|
* new ADC sample data is available.
|
|
*
|
|
* Input Parameters:
|
|
* dev - The ADC device structure that was previously registered by adc_register()
|
|
* ch - And ID for the ADC channel number that generated the data
|
|
* data - The actual converted data from the channel.
|
|
*
|
|
* Returned Value:
|
|
* Zero on success; a negated errno value on failure.
|
|
*/
|
|
|
|
CODE int (*au_receive)(FAR struct adc_dev_s *dev, uint8_t ch, int32_t data);
|
|
};
|
|
|
|
/* This describes on ADC message */
|
|
|
|
struct adc_msg_s
|
|
{
|
|
uint8_t am_channel; /* The 8-bit ADC Channel */
|
|
int32_t am_data; /* ADC convert result (4 bytes) */
|
|
} packed_struct;
|
|
|
|
/* This describes a FIFO of ADC messages */
|
|
|
|
struct adc_fifo_s
|
|
{
|
|
sem_t af_sem; /* Counting semaphore */
|
|
uint8_t af_head; /* Index to the head [IN] index in the circular buffer */
|
|
uint8_t af_tail; /* Index to the tail [OUT] index in the circular buffer */
|
|
/* Circular buffer of CAN messages */
|
|
struct adc_msg_s af_buffer[CONFIG_ADC_FIFOSIZE];
|
|
};
|
|
|
|
/* This structure defines all of the operations providd by the architecture specific
|
|
* logic. All fields must be provided with non-NULL function pointers by the
|
|
* caller of can_register().
|
|
*/
|
|
|
|
struct adc_dev_s;
|
|
struct adc_ops_s
|
|
{
|
|
/* Bind the upper-half driver callbacks to the lower-half implementation. This
|
|
* must be called early in order to receive ADC event notifications.
|
|
*/
|
|
|
|
CODE int (*ao_bind)(FAR struct adc_dev_s *dev,
|
|
FAR const struct adc_callback_s *callback);
|
|
|
|
/* Reset the ADC device. Called early to initialize the hardware. This
|
|
* is called, before ao_setup() and on error conditions.
|
|
*/
|
|
|
|
CODE void (*ao_reset)(FAR struct adc_dev_s *dev);
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
CODE int (*ao_setup)(FAR struct adc_dev_s *dev);
|
|
|
|
/* Disable the ADC. This method is called when the ADC device is closed.
|
|
* This method reverses the operation the setup method.
|
|
*/
|
|
|
|
CODE void (*ao_shutdown)(FAR struct adc_dev_s *dev);
|
|
|
|
/* Call to enable or disable RX interrupts */
|
|
|
|
CODE void (*ao_rxint)(FAR struct adc_dev_s *dev, bool enable);
|
|
|
|
/* All ioctl calls will be routed through this method */
|
|
|
|
CODE int (*ao_ioctl)(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
|
|
};
|
|
|
|
/* This is the device structure used by the driver. The caller of
|
|
* adc_register() must allocate and initialize this structure. The calling
|
|
* logic need only set all fields to zero except:
|
|
*
|
|
* The elements of 'ad_ops', and 'ad_priv'
|
|
*
|
|
* The common logic will initialize all semaphores.
|
|
*/
|
|
|
|
struct adc_dev_s
|
|
{
|
|
#ifdef CONFIG_ADC
|
|
/* Fields managed by common upper half ADC logic */
|
|
|
|
uint8_t ad_ocount; /* The number of times the device has been opened */
|
|
uint8_t ad_nrxwaiters; /* Number of threads waiting to enqueue a message */
|
|
sem_t ad_closesem; /* Locks out new opens while close is in progress */
|
|
sem_t ad_recvsem; /* Used to wakeup user waiting for space in ad_recv.buffer */
|
|
struct adc_fifo_s ad_recv; /* Describes receive FIFO */
|
|
#endif
|
|
|
|
/* Fields provided by lower half ADC logic */
|
|
|
|
FAR const struct adc_ops_s *ad_ops; /* Arch-specific operations */
|
|
FAR void *ad_priv; /* Used by the arch-specific logic */
|
|
};
|
|
|
|
/************************************************************************************
|
|
* Public Function Prototypes
|
|
************************************************************************************/
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
/************************************************************************************
|
|
* "Upper-Half" ADC Driver Interfaces
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: adc_register
|
|
*
|
|
* Description:
|
|
* Register a ADC driver. This function binds an instance of a "lower half" ADC
|
|
* driver with the "upper half" ADC device and registers that device so that can
|
|
* be used by application code.
|
|
*
|
|
* Input parameters:
|
|
* path - The full path to the driver to be registers in the NuttX pseudo-
|
|
* filesystem. The recommended convention is to name all PWM drivers
|
|
* as "/dev/adc", "/dev/adc1", etc. where the driver path differs only
|
|
* in the "minor" number at the end of the device name.
|
|
* dev - A pointer to an instance of lower half ADC driver. This instance
|
|
* is bound to the upper half ADC driver and must persists as long as the
|
|
* upper half driver driver persists.
|
|
*
|
|
* Returned Value:
|
|
* Zero on success; a negated errno value on failure.
|
|
*
|
|
************************************************************************************/
|
|
|
|
int adc_register(FAR const char *path, FAR struct adc_dev_s *dev);
|
|
|
|
/************************************************************************************
|
|
* Platform-Independent "Lower Half" ADC Driver Interfaces
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: up_ads1255initialize
|
|
*
|
|
* Description:
|
|
* Initialize the TI ADS 125X lower half driver
|
|
*
|
|
************************************************************************************/
|
|
|
|
FAR struct adc_dev_s *up_ads1255initialize(FAR struct spi_dev_s *spi,
|
|
unsigned int devno);
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_NUTTX_ANALOG_ADC_H */
|