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71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* Copyright (C) 2022 Gunar Schorcht
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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#pragma once
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/**
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* @ingroup cpu_esp32
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* @{
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*
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* @file
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* @brief Architecture specific internal ADC functions for ESP32
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*
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* @author Gunar Schorcht <gunar@schorcht.net>
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* @}
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "driver/adc_types_legacy.h"
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#include "periph/gpio.h"
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#include "soc/soc_caps.h"
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#ifndef DOXYGEN /* hide implementation details from doxygen */
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#define RTCIO_GPIO(n) n /* n-th RTCIO GPIO */
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#define RTCIO_NA UINT8_MAX /* RTCIO pin not available */
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#define ADC_UNIT_INV ((adc_unit_t)255) /* Invalid ADC unit ID */
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#define ADC_CHANNEL_INV SOC_ADC_MAX_CHANNEL_NUM /* Invalid ADC channel ID */
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#define ADC1_CHANNEL_MAX (SOC_ADC_CHANNEL_NUM(ADC_UNIT_1)) /* Number of channels of ADC1 */
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#define ADC2_CHANNEL_MAX (SOC_ADC_CHANNEL_NUM(ADC_UNIT_2)) /* Number of channels of ADC2 */
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#define ADC_CHANNEL_MAX(u) ((u == ADC_UNIT_1) ? ADC1_CHANNEL_MAX : ADC2_CHANNEL_MAX)
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/**
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* @brief ADC hardware descriptor (for internal use only)
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*/
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typedef struct {
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uint8_t rtc_gpio; /**< RTC GPIO number */
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gpio_t gpio; /**< GPIO */
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adc_unit_t adc_ctrl; /**< ADC controller */
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adc_channel_t adc_channel; /**< channel of ADC controller */
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char* pad_name; /**< symbolic name of pad */
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} _adc_hw_desc_t;
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/**
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* @brief ADC hardware descriptor table (for internal use only)
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*
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* @note The index of entries in the table MUST correspond to the
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* RTCIO GPIO number.
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*/
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extern const _adc_hw_desc_t _adc_hw[];
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/**
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* @brief GPIO to RTC IO map (for internal use only)
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*/
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extern const gpio_t _gpio_rtcio_map[];
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#endif /* !DOXYGEN */
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#ifdef __cplusplus
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}
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#endif
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