esp-idf/components/driver/esp32/adc.c

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2021-05-23 20:02:15 -04:00
/*
* SPDX-FileCopyrightText: 2016-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <ctype.h>
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_log.h"
#include "sys/lock.h"
#include "soc/rtc.h"
#include "soc/periph_defs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/xtensa_api.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"
#include "esp_intr_alloc.h"
#include "driver/rtc_io.h"
#include "esp_private/rtc_ctrl.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#ifndef NDEBUG
// Enable built-in checks in queue.h in debug builds
#define INVARIANTS
#endif
#include "sys/queue.h"
#include "hal/adc_types.h"
#include "hal/adc_hal.h"
#define ADC_GET_IO_NUM(periph, channel) (adc_channel_io_map[periph][channel])
extern portMUX_TYPE rtc_spinlock; //TODO: Will be placed in the appropriate position after the rtc module is finished.
#define ADC_ENTER_CRITICAL() portENTER_CRITICAL(&rtc_spinlock)
#define ADC_EXIT_CRITICAL() portEXIT_CRITICAL(&rtc_spinlock)
/*---------------------------------------------------------------
HALL SENSOR
---------------------------------------------------------------*/
static int hall_sensor_get_value(void) //hall sensor without LNA
{
int hall_value;
adc_power_acquire();
ADC_ENTER_CRITICAL();
/* disable other peripherals. */
adc_ll_amp_disable();
adc_ll_hall_enable();
// set controller
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adc_ll_set_controller( ADC_UNIT_1, ADC_LL_CTRL_RTC );
hall_value = adc_hal_hall_convert();
adc_ll_hall_disable();
ADC_EXIT_CRITICAL();
adc_power_release();
return hall_value;
}
/**
* To Be Deprecated
*/
extern esp_err_t adc_common_gpio_init(adc_unit_t adc_unit, adc_channel_t channel);
int hall_sensor_read(void)
{
adc_common_gpio_init(ADC_UNIT_1, ADC1_CHANNEL_0);
adc_common_gpio_init(ADC_UNIT_1, ADC1_CHANNEL_3);
adc1_config_channel_atten(ADC1_CHANNEL_0, ADC_ATTEN_DB_0);
adc1_config_channel_atten(ADC1_CHANNEL_3, ADC_ATTEN_DB_0);
return hall_sensor_get_value();
}