ad469x_iio.c File Reference

Implementation of AD469x IIO application interfaces. More...

#include <inttypes.h>
#include <string.h>
#include <math.h>
#include "app_config.h"
#include "ad469x_iio.h"
#include "ad469x_support.h"
#include "ad469x_user_config.h"
#include "common.h"
#include "no_os_error.h"
#include "no_os_util.h"
#include "no_os_gpio.h"
#include "no_os_pwm.h"
#include "no_os_print_log.h"
#include "iio_trigger.h"

Include dependency graph for ad469x_iio.c:

Macros
#define	AD469X_CHN_ATTR(_name, _priv)
#define	AD469X_CHN_AVAIL_ATTR(_name, _priv)
#define	AD469X_IIO_CH(_name, _idx)
#define	DATA_BUFFER_SIZE   (32768)
#define	NUM_OF_IIO_DEVICES   1
#define	AD469x_IIO_TRIGGER_NAME   "ad469x_iio_trigger"
#define	REGISTER_MAX_VAL   0x017F
#define	PWM_PERIOD_TO_FREQUENCY(x)   (1000000000.0 / x)
#define	BUF_READ_TIMEOUT   0xffffffff
#define	AD469X_GAIN_CORR_SCALE(x)   (float)(x) / (float)(ADC_MAX_COUNT_BIPOLAR)
#define	MAX_LOCAL_BUF_SIZE   8000
#define	MAX_DMA_NDTR   (no_os_min(65535, MAX_LOCAL_BUF_SIZE/2))

Enumerations
enum	ad469x_attribute_ids {   ADC_RAW ,   ADC_SCALE ,   ADC_OFFSET ,   ADC_REFERENCE_SEL ,   ADC_OFFSET_CORRECTION ,   ADC_GAIN_CORRECTION ,   ADC_AIN_HIGH_Z ,   ADC_SAMPLING_FREQUENCY }

Functions
int32_t	ad469x_update_sampling_frequency (uint32_t *sampling_rate)
	Set the sampling rate and get the updated value supported by MCU platform. More...
int32_t	ad469x_trigger_handler (struct iio_device_data *iio_dev_data)
	Push data into IIO buffer when trigger handler IRQ is invoked. More...
void	burst_capture_callback (void *context)
	Interrupt Service Routine to monitor end of conversion event. More...
int32_t	ad469x_iio_initialize (void)
	Release resources allocated for IIO device. More...
void	ad469x_iio_event_handler (void)
	Run the ad469x IIO event handler. More...

Variables
struct ad469x_dev *	p_ad469x_dev = NULL
volatile bool	ad469x_conversion_flag = false
volatile uint32_t *	buff_start_addr
volatile bool	dma_config_updated = false
struct scan_type	ad469x_iio_scan_type
volatile struct iio_device_data *	global_iio_dev_data
uint32_t	global_nb_of_samples
int32_t	data_read

Detailed Description

Implementation of AD469x IIO application interfaces.

This module acts as an interface for AD469x IIO application

Copyright (c) 2021-24 Analog Devices, Inc.

This software is proprietary to Analog Devices, Inc. and its licensors. By using this software you agree to the terms of the associated Analog Devices Software License Agreement.

Macro Definition Documentation

AD469X_CHN_ATTR

#define AD469X_CHN_ATTR	(		_name,
			_priv
	)

Value:

        {\
        .name = _name,\
        .priv = _priv,\
        .show = ad469x_iio_attr_get,\
        .store = ad469x_iio_attr_set\
}

AD469X_CHN_AVAIL_ATTR

#define AD469X_CHN_AVAIL_ATTR	(		_name,
			_priv
	)

Value:

    {\
    .name = _name,\
    .priv = _priv,\
    .show = ad469x_iio_attr_available_get,\
    .store = ad469x_iio_attr_available_set\
}

AD469X_GAIN_CORR_SCALE

#define AD469X_GAIN_CORR_SCALE

(

x

)

(float)(x) / (float)(ADC_MAX_COUNT_BIPOLAR)

AD469X_IIO_CH

#define AD469X_IIO_CH	(		_name,
			_idx
	)

Value:

    {\
    .name = _name #_idx, \
    .ch_type = IIO_VOLTAGE,\
    .ch_out = false,\
    .indexed = true,\
    .channel = _idx,\
    .scan_index = _idx,\
    .scan_type = &ad469x_iio_scan_type,\
    .attributes = ad469x_iio_ch_attributes\
}

AD469x_IIO_TRIGGER_NAME

#define AD469x_IIO_TRIGGER_NAME   "ad469x_iio_trigger"

BUF_READ_TIMEOUT

#define BUF_READ_TIMEOUT   0xffffffff

DATA_BUFFER_SIZE

#define DATA_BUFFER_SIZE   (32768)

MAX_DMA_NDTR

#define MAX_DMA_NDTR   (no_os_min(65535, MAX_LOCAL_BUF_SIZE/2))

MAX_LOCAL_BUF_SIZE

#define MAX_LOCAL_BUF_SIZE   8000

NUM_OF_IIO_DEVICES

#define NUM_OF_IIO_DEVICES   1

PWM_PERIOD_TO_FREQUENCY

#define PWM_PERIOD_TO_FREQUENCY

(

x

)

(1000000000.0 / x)

REGISTER_MAX_VAL

#define REGISTER_MAX_VAL   0x017F

Enumeration Type Documentation

ad469x_attribute_ids

enum ad469x_attribute_ids

Enumerator
ADC_RAW
ADC_SCALE
ADC_OFFSET
ADC_REFERENCE_SEL
ADC_OFFSET_CORRECTION
ADC_GAIN_CORRECTION
ADC_AIN_HIGH_Z
ADC_SAMPLING_FREQUENCY

Function Documentation

ad469x_iio_event_handler()

void ad469x_iio_event_handler

(

void

)

Run the ad469x IIO event handler.

Returns

None

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ad469x_iio_initialize()

int32_t ad469x_iio_initialize

(

void

)

Release resources allocated for IIO device.

Parameters

desc[in]

- IIO device descriptor

Returns

0 in case of success, negative value otherwise

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ad469x_trigger_handler()

int32_t ad469x_trigger_handler

(

struct iio_device_data *

iio_dev_data

)

Push data into IIO buffer when trigger handler IRQ is invoked.

Parameters

iio_dev_data[in]

- IIO device data instance

Returns

0 in case of success or negative value otherwise

ad469x_update_sampling_frequency()

int32_t ad469x_update_sampling_frequency

(

uint32_t *

sampling_rate

)

Set the sampling rate and get the updated value supported by MCU platform.

Parameters

sampling_rate[in,out]

- Sampling rate value

Returns

0 in case of success, negative error code otherwise

burst_capture_callback()

void burst_capture_callback

(

void *

context

)

Interrupt Service Routine to monitor end of conversion event.

Parameters

context[in]

- Callback context (unused)

Returns

none

Variable Documentation

ad469x_conversion_flag

volatile bool ad469x_conversion_flag = false

ad469x_iio_scan_type

struct scan_type ad469x_iio_scan_type

Initial value:

= {
 
 
 
    .sign = 'u',
 
    .realbits = CHN_STORAGE_BITS,
    .storagebits = ADC_RESOLUTION,
    .shift = 0,
 
 
 
    .is_big_endian = false
 
}

buff_start_addr

volatile uint32_t* buff_start_addr

data_read

int32_t data_read

dma_config_updated

volatile bool dma_config_updated = false

global_iio_dev_data

volatile struct iio_device_data* global_iio_dev_data

global_nb_of_samples

uint32_t global_nb_of_samples

p_ad469x_dev

struct ad469x_dev* p_ad469x_dev = NULL