79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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/**
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* @file
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* @brief ADC HAL implementation
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*/
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#include "nrf_adc.h"
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#ifndef NRF52
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/**
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* @brief Function for configuring ADC.
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*
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* This function powers on ADC and configures it. ADC is in DISABLE state after configuration,
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* so it should be enabled before using it.
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*
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* @param[in] config Requested configuration.
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*/
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void nrf_adc_configure(nrf_adc_config_t * config)
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{
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uint32_t config_reg = 0;
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config_reg |= ((uint32_t)config->resolution << ADC_CONFIG_RES_Pos) & ADC_CONFIG_RES_Msk;
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config_reg |= ((uint32_t)config->scaling << ADC_CONFIG_INPSEL_Pos) & ADC_CONFIG_INPSEL_Msk;
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config_reg |= ((uint32_t)config->reference << ADC_CONFIG_REFSEL_Pos) & ADC_CONFIG_REFSEL_Msk;
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if (config->reference & ADC_CONFIG_EXTREFSEL_Msk)
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{
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config_reg |= config->reference & ADC_CONFIG_EXTREFSEL_Msk;
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}
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/* select input */
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nrf_adc_input_select(NRF_ADC_CONFIG_INPUT_DISABLED);
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/* set new configuration keeping selected input */
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NRF_ADC->CONFIG = config_reg | (NRF_ADC->CONFIG & ADC_CONFIG_PSEL_Msk);
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}
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/**
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* @brief Blocking function for executing single ADC conversion.
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*
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* This function selects the desired input, starts a single conversion,
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* waits for it to finish, and returns the result.
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* ADC is left in STOP state, the given input is selected.
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* This function does not check if ADC is initialized and powered.
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*
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* @param[in] input Requested input to be selected.
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*
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* @return Conversion result
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*/
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int32_t nrf_adc_convert_single(nrf_adc_config_input_t input)
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{
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int32_t val;
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nrf_adc_input_select(input);
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nrf_adc_start();
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while (!nrf_adc_conversion_finished())
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{
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}
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nrf_adc_conversion_event_clean();
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val = nrf_adc_result_get();
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nrf_adc_stop();
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return val;
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}
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#endif
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