110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
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/* ADC1 Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "esp_log.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/adc_common.h"
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#include "esp_adc_cal.h"
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#include "who_adc_button.h"
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//ADC Channels
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#define ADC1_EXAMPLE_CHAN0 ADC1_CHANNEL_0
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//ADC Attenuation
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#define ADC_EXAMPLE_ATTEN ADC_ATTEN_DB_11
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//ADC Calibration
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#if CONFIG_IDF_TARGET_ESP32
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#define ADC_EXAMPLE_CALI_SCHEME ESP_ADC_CAL_VAL_EFUSE_VREF
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#elif CONFIG_IDF_TARGET_ESP32S2
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#define ADC_EXAMPLE_CALI_SCHEME ESP_ADC_CAL_VAL_EFUSE_TP
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#elif CONFIG_IDF_TARGET_ESP32C3
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#define ADC_EXAMPLE_CALI_SCHEME ESP_ADC_CAL_VAL_EFUSE_TP
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#elif CONFIG_IDF_TARGET_ESP32S3
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#define ADC_EXAMPLE_CALI_SCHEME ESP_ADC_CAL_VAL_EFUSE_TP_FIT
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#endif
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#define PRESS_INTERVAL 500000
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static uint32_t voltage = 0;
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static const char *TAG = "ADC SINGLE";
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static esp_adc_cal_characteristics_t adc1_chars;
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button_adc_config_t *adc_buttons;
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int adc_button_num;
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static QueueHandle_t xQueueKeyStateO = NULL;
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static bool adc_calibration_init(void)
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{
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esp_err_t ret;
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bool cali_enable = false;
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ret = esp_adc_cal_check_efuse(ADC_EXAMPLE_CALI_SCHEME);
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if (ret == ESP_ERR_NOT_SUPPORTED)
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{
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ESP_LOGW(TAG, "Calibration scheme not supported, skip software calibration");
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}
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else if (ret == ESP_ERR_INVALID_VERSION)
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{
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ESP_LOGW(TAG, "eFuse not burnt, skip software calibration");
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}
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else if (ret == ESP_OK)
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{
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cali_enable = true;
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esp_adc_cal_characterize(ADC_UNIT_1, ADC_EXAMPLE_ATTEN, ADC_WIDTH_BIT_DEFAULT, 0, &adc1_chars);
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}
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else
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{
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ESP_LOGE(TAG, "Invalid arg");
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}
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return cali_enable;
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}
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void adc_button_task(void *arg)
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{
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int last_button_pressed = -1;
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int button_pressed = -1;
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int64_t backup_time = esp_timer_get_time();
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int64_t last_time = esp_timer_get_time();
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//ADC1 config
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ESP_ERROR_CHECK(adc1_config_width(ADC_WIDTH_BIT_DEFAULT));
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ESP_ERROR_CHECK(adc1_config_channel_atten(ADC1_EXAMPLE_CHAN0, ADC_EXAMPLE_ATTEN));
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while (1)
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{
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voltage = adc1_get_raw(ADC1_EXAMPLE_CHAN0);
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backup_time = esp_timer_get_time();
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for (int i = 0; i < adc_button_num; ++i)
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{
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if ((voltage >= adc_buttons[i].min) && (voltage <= adc_buttons[i].max))
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{
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button_pressed = adc_buttons[i].button_index;
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if ((button_pressed != last_button_pressed) || ((backup_time - last_time) > PRESS_INTERVAL))
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{
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last_button_pressed = button_pressed;
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last_time = backup_time;
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xQueueOverwrite(xQueueKeyStateO, &button_pressed);
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break;
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}
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}
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}
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vTaskDelay(pdMS_TO_TICKS(10));
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}
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}
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void register_adc_button(button_adc_config_t *buttons_ptr, int button_num, const QueueHandle_t key_state_o)
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{
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xQueueKeyStateO = key_state_o;
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adc_buttons = buttons_ptr;
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adc_button_num = button_num;
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xTaskCreatePinnedToCore(adc_button_task, "adc_button_scan_task", 1024, NULL, 5, NULL, 0);
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}
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