79 lines
No EOL
2.3 KiB
C
79 lines
No EOL
2.3 KiB
C
// Copyright 2020 Espressif Systems (Shanghai) Co. Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _IOT_BUTTON_ADC_H_
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#define _IOT_BUTTON_ADC_H_
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#include "driver/gpio.h"
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#include "driver/adc.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ADC_BUTTON_COMBINE(channel, index) ((channel)<<8 | (index))
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#define ADC_BUTTON_SPLIT_INDEX(data) ((uint32_t)(data)&0xff)
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#define ADC_BUTTON_SPLIT_CHANNEL(data) (((uint32_t)(data) >> 8) & 0xff)
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/**
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* @brief adc button configuration
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*
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*/
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typedef struct {
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adc1_channel_t adc_channel; /**< Channel of ADC */
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uint8_t button_index; /**< button index on the channel */
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uint16_t min; /**< min voltage in mv corresponding to the button */
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uint16_t max; /**< max voltage in mv corresponding to the button */
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} button_adc_config_t;
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/**
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* @brief Initialize gpio button
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*
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* @param config pointer of configuration struct
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG Arguments is NULL.
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* - ESP_ERR_NOT_SUPPORTED Arguments out of range.
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* - ESP_ERR_INVALID_STATE State is error.
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*/
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esp_err_t button_adc_init(const button_adc_config_t *config);
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/**
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* @brief Deinitialize gpio button
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*
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* @param channel ADC channel
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* @param button_index Button index on the channel
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG Arguments is invalid.
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*/
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esp_err_t button_adc_deinit(adc1_channel_t channel, int button_index);
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/**
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* @brief Get the adc button level
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*
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* @param button_index It is compressed by ADC channel and button index, use the macro ADC_BUTTON_COMBINE to generate. It will be treated as a uint32_t variable.
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*
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* @return
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* - 0 Not pressed
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* - 1 Pressed
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*/
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uint8_t button_adc_get_key_level(void *button_index);
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#ifdef __cplusplus
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}
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#endif
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#endif |