ad7606_support.c

00001 /*************************************************************************//**
00002  *   @file   ad7606_support.c
00003  *   @brief  AD7606 device No-OS driver supports
00004 ******************************************************************************
00005 * Copyright (c) 2020 Analog Devices, Inc.
00006 *
00007 * All rights reserved.
00008 *
00009 * This software is proprietary to Analog Devices, Inc. and its licensors.
00010 * By using this software you agree to the terms of the associated
00011 * Analog Devices Software License Agreement.
00012 *****************************************************************************/
00013 
00014 /******************************************************************************/
00015 /***************************** Include Files **********************************/
00016 /******************************************************************************/
00017 
00018 #include <stdint.h>
00019 
00020 #include "app_config.h"
00021 #include "ad7606_support.h"
00022 #include "ad7606_data_capture.h"
00023 
00024 /******************************************************************************/
00025 /********************** Macros and Constants Definition ***********************/
00026 /******************************************************************************/
00027 
00028 /******************************************************************************/
00029 /********************** Variables and User Defined Data Types *****************/
00030 /******************************************************************************/
00031 
00032 /******************************************************************************/
00033 /************************ Functions Definitions *******************************/
00034 /******************************************************************************/
00035 
00036 /*!
00037  * @brief   Function to convert adc raw data into equivalent voltage
00038  * @param   adc_raw[in] - ADC raw data
00039  * @param   scale[in] - ADC raw to voltage conversion scale
00040  * @return  equivalent voltage
00041  */
00042 float convert_adc_raw_to_voltage(int32_t adc_raw, float scale)
00043 {
00044     float voltage;
00045 
00046     /* Convert adc data into equivalent voltage.
00047      * scale = (chn_range / MAX_ADC_CNT * 1000) as defined in iio_ad7606.c
00048      * */
00049     voltage = (adc_raw  * (scale / 1000));
00050 
00051     return voltage;
00052 }
00053 
00054 
00055 /*!
00056  * @brief   Function to get the polarity of analog input
00057  * @param   chn_range_bits[in] - Bits from the channel range register
00058  * @return  UNIPOLAR or BIPOLAR
00059  */
00060 polarity_e ad7606_get_input_polarity(uint8_t chn_range_bits)
00061 {
00062     polarity_e polarity;
00063 
00064     if (chn_range_bits >= AD7606C_UNIPOLAR_RANGE_MIN
00065         && chn_range_bits <= AD7606C_UNIPOLAR_RANGE_MAX) {
00066         polarity = UNIPOLAR;
00067     } else {
00068         polarity = BIPOLAR;
00069     }
00070 
00071     return polarity;
00072 }
00073 
00074 
00075 /*!
00076  * @brief   Read the num_of_bytes from previous conversion
00077  * @param   dev[in]- Device instance
00078  * @param   num_of_bytes[in] - Number of bytes to read from previous conversion
00079  * @return  SUCCESS in case of success, FAILURE otherwise
00080  */
00081 int32_t ad7606_read_conversion_data(struct ad7606_dev *dev,
00082                     uint8_t num_of_bytes)
00083 {
00084     memset(dev->data, 0, sizeof(dev->data));
00085     return spi_write_and_read(dev->spi_desc, dev->data, num_of_bytes);
00086 }