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esp-idf/components/esp_adc/adc_continuous.c

538 wiersze
20 KiB
C
Czysty Bezpośredni odnośnik Wina Historia

/*
* SPDX-FileCopyrightText: 2016-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <esp_types.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "sdkconfig.h"
#if CONFIG_ADC_ENABLE_DEBUG_LOG
// The local log level must be defined before including esp_log.h
// Set the maximum log level for this source file
#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG
#endif
#include "esp_intr_alloc.h"
#include "esp_log.h"
#include "esp_pm.h"
#include "esp_check.h"
#include "esp_heap_caps.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"
#include "freertos/ringbuf.h"
#include "esp_private/periph_ctrl.h"
#include "esp_private/adc_private.h"
#include "esp_private/adc_share_hw_ctrl.h"
#include "esp_private/sar_periph_ctrl.h"
#include "esp_clk_tree.h"
#include "driver/gpio.h"
#include "esp_adc/adc_continuous.h"
#include "hal/adc_types.h"
#include "hal/adc_hal.h"
#include "hal/dma_types.h"
#include "esp_memory_utils.h"
#include "adc_continuous_internal.h"
#include "esp_private/adc_dma.h"
#include "adc_dma_internal.h"
static const char *ADC_TAG = "adc_continuous";
#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)
#define INTERNAL_BUF_NUM 5
/*---------------------------------------------------------------
ADC Continuous Read Mode (via DMA)
---------------------------------------------------------------*/
static IRAM_ATTR bool adc_dma_intr(adc_continuous_ctx_t *adc_digi_ctx)
{
BaseType_t taskAwoken = 0;
bool need_yield = false;
BaseType_t ret;
adc_hal_dma_desc_status_t status = false;
uint8_t *finished_buffer = NULL;
uint32_t finished_size = 0;
while (1) {
status = adc_hal_get_reading_result(&adc_digi_ctx->hal, adc_digi_ctx->rx_eof_desc_addr, &finished_buffer, &finished_size);
if (status != ADC_HAL_DMA_DESC_VALID) {
break;
}
ret = xRingbufferSendFromISR(adc_digi_ctx->ringbuf_hdl, finished_buffer, finished_size, &taskAwoken);
need_yield |= (taskAwoken == pdTRUE);
if (adc_digi_ctx->cbs.on_conv_done) {
adc_continuous_evt_data_t edata = {
.conv_frame_buffer = finished_buffer,
.size = finished_size,
};
if (adc_digi_ctx->cbs.on_conv_done(adc_digi_ctx, &edata, adc_digi_ctx->user_data)) {
need_yield |= true;
}
}
if (ret == pdFALSE) {
if (adc_digi_ctx->flags.flush_pool) {
size_t actual_size = 0;
uint8_t *old_data = xRingbufferReceiveUpToFromISR(adc_digi_ctx->ringbuf_hdl, &actual_size, adc_digi_ctx->ringbuf_size);
/**
* Replace by ringbuffer reset API when this API is ready.
* Now we do manual reset.
* For old_data == NULL condition (equals to the future ringbuffer reset fail condition), we don't care this time data,
* as this only happens when the ringbuffer size is small, new data will be filled in soon.
*/
if (old_data) {
vRingbufferReturnItemFromISR(adc_digi_ctx->ringbuf_hdl, old_data, &taskAwoken);
xRingbufferSendFromISR(adc_digi_ctx->ringbuf_hdl, finished_buffer, finished_size, &taskAwoken);
if (taskAwoken == pdTRUE) {
need_yield |= true;
}
}
}
//ringbuffer overflow happens before
if (adc_digi_ctx->cbs.on_pool_ovf) {
adc_continuous_evt_data_t edata = {};
if (adc_digi_ctx->cbs.on_pool_ovf(adc_digi_ctx, &edata, adc_digi_ctx->user_data)) {
need_yield |= true;
}
}
}
}
return need_yield;
}
static int8_t adc_digi_get_io_num(adc_unit_t adc_unit, uint8_t adc_channel)
{
assert(adc_unit < SOC_ADC_PERIPH_NUM);
uint8_t adc_n = (adc_unit == ADC_UNIT_1) ? 0 : 1;
return adc_channel_io_map[adc_n][adc_channel];
}
static esp_err_t adc_digi_gpio_init(adc_unit_t adc_unit, uint16_t channel_mask)
{
esp_err_t ret = ESP_OK;
uint64_t gpio_mask = 0;
uint32_t n = 0;
int8_t io = 0;
while (channel_mask) {
if (channel_mask & 0x1) {
io = adc_digi_get_io_num(adc_unit, n);
if (io < 0) {
return ESP_ERR_INVALID_ARG;
}
gpio_mask |= BIT64(io);
}
channel_mask = channel_mask >> 1;
n++;
}
gpio_config_t cfg = {
.pin_bit_mask = gpio_mask,
.mode = GPIO_MODE_DISABLE,
};
ret = gpio_config(&cfg);
return ret;
}
esp_err_t adc_continuous_new_handle(const adc_continuous_handle_cfg_t *hdl_config, adc_continuous_handle_t *ret_handle)
{
#if CONFIG_ADC_ENABLE_DEBUG_LOG
esp_log_level_set(ADC_TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
ESP_RETURN_ON_FALSE((hdl_config->conv_frame_size % SOC_ADC_DIGI_DATA_BYTES_PER_CONV == 0), ESP_ERR_INVALID_ARG, ADC_TAG, "conv_frame_size should be in multiples of `SOC_ADC_DIGI_DATA_BYTES_PER_CONV`");
adc_continuous_ctx_t *adc_ctx = heap_caps_calloc(1, sizeof(adc_continuous_ctx_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
if (adc_ctx == NULL) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//ringbuffer storage/struct buffer
adc_ctx->ringbuf_size = hdl_config->max_store_buf_size;
adc_ctx->ringbuf_storage = heap_caps_calloc(1, hdl_config->max_store_buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
adc_ctx->ringbuf_struct = heap_caps_calloc(1, sizeof(StaticRingbuffer_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
if (!adc_ctx->ringbuf_storage || !adc_ctx->ringbuf_struct) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//ringbuffer
adc_ctx->ringbuf_hdl = xRingbufferCreateStatic(hdl_config->max_store_buf_size, RINGBUF_TYPE_BYTEBUF, adc_ctx->ringbuf_storage, adc_ctx->ringbuf_struct);
if (!adc_ctx->ringbuf_hdl) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//malloc internal buffer used by DMA
adc_ctx->rx_dma_buf = heap_caps_calloc(1, hdl_config->conv_frame_size * INTERNAL_BUF_NUM, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA);
if (!adc_ctx->rx_dma_buf) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//malloc dma descriptor
uint32_t dma_desc_num_per_frame = (hdl_config->conv_frame_size + DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED - 1) / DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED;
uint32_t dma_desc_max_num = dma_desc_num_per_frame * INTERNAL_BUF_NUM;
adc_ctx->hal.rx_desc = heap_caps_calloc(1, (sizeof(dma_descriptor_t)) * dma_desc_max_num, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA);
if (!adc_ctx->hal.rx_desc) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//malloc pattern table
adc_ctx->hal_digi_ctrlr_cfg.adc_pattern = calloc(1, SOC_ADC_PATT_LEN_MAX * sizeof(adc_digi_pattern_config_t));
if (!adc_ctx->hal_digi_ctrlr_cfg.adc_pattern) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
#if CONFIG_PM_ENABLE
ret = esp_pm_lock_create(ESP_PM_APB_FREQ_MAX, 0, "adc_dma", &adc_ctx->pm_lock);
if (ret != ESP_OK) {
goto cleanup;
}
#endif //CONFIG_PM_ENABLE
ret = adc_dma_init(&adc_ctx->adc_dma);
adc_ctx->adc_intr_func = adc_dma_intr;
if (ret != ESP_OK) {
goto cleanup;
}
ret = adc_dma_intr_event_init(adc_ctx);
adc_hal_dma_config_t config = {
.eof_desc_num = INTERNAL_BUF_NUM,
.eof_step = dma_desc_num_per_frame,
.eof_num = hdl_config->conv_frame_size / SOC_ADC_DIGI_DATA_BYTES_PER_CONV
};
adc_hal_dma_ctx_config(&adc_ctx->hal, &config);
adc_ctx->flags.flush_pool = hdl_config->flags.flush_pool;
adc_ctx->fsm = ADC_FSM_INIT;
*ret_handle = adc_ctx;
adc_apb_periph_claim();
#if SOC_ADC_CALIBRATION_V1_SUPPORTED
adc_hal_calibration_init(ADC_UNIT_1);
adc_hal_calibration_init(ADC_UNIT_2);
#endif //#if SOC_ADC_CALIBRATION_V1_SUPPORTED
return ret;
cleanup:
adc_continuous_deinit(adc_ctx);
return ret;
}
esp_err_t adc_continuous_start(adc_continuous_handle_t handle)
{
ESP_RETURN_ON_FALSE(handle, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver isn't initialised");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_INIT, ESP_ERR_INVALID_STATE, ADC_TAG, "ADC continuous mode isn't in the init state, it's started already");
//reset ADC digital part to reset ADC sampling EOF counter
periph_module_reset(PERIPH_SARADC_MODULE);
if (handle->pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_acquire(handle->pm_lock), ADC_TAG, "acquire pm_lock failed");
}
handle->fsm = ADC_FSM_STARTED;
sar_periph_ctrl_adc_continuous_power_acquire();
//reset flags
if (handle->use_adc1) {
adc_lock_acquire(ADC_UNIT_1);
}
if (handle->use_adc2) {
adc_lock_acquire(ADC_UNIT_2);
}
#if SOC_ADC_CALIBRATION_V1_SUPPORTED
if (handle->use_adc1) {
adc_set_hw_calibration_code(ADC_UNIT_1, handle->adc1_atten);
}
if (handle->use_adc2) {
adc_set_hw_calibration_code(ADC_UNIT_2, handle->adc2_atten);
}
#endif //#if SOC_ADC_CALIBRATION_V1_SUPPORTED
#if SOC_ADC_ARBITER_SUPPORTED
if (handle->use_adc2) {
adc_arbiter_t config = ADC_ARBITER_CONFIG_DEFAULT();
adc_hal_arbiter_config(&config);
}
#endif //#if SOC_ADC_ARBITER_SUPPORTED
if (handle->use_adc1) {
adc_hal_set_controller(ADC_UNIT_1, ADC_HAL_CONTINUOUS_READ_MODE);
}
if (handle->use_adc2) {
adc_hal_set_controller(ADC_UNIT_2, ADC_HAL_CONTINUOUS_READ_MODE);
}
adc_hal_digi_init(&handle->hal);
adc_hal_digi_controller_config(&handle->hal, &handle->hal_digi_ctrlr_cfg);
adc_hal_digi_enable(false);
adc_dma_stop(handle->adc_dma);
adc_hal_digi_connect(false);
adc_dma_reset(handle->adc_dma);
adc_hal_digi_reset();
adc_hal_digi_dma_link(&handle->hal, handle->rx_dma_buf);
adc_dma_start(handle->adc_dma, handle->hal.rx_desc);
adc_hal_digi_connect(true);
adc_hal_digi_enable(true);
return ESP_OK;
}
esp_err_t adc_continuous_stop(adc_continuous_handle_t handle)
{
ESP_RETURN_ON_FALSE(handle, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver isn't initialised");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_STARTED, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver is already stopped");
handle->fsm = ADC_FSM_INIT;
adc_dma_stop(handle->adc_dma);
adc_hal_digi_enable(false);
adc_hal_digi_connect(false);
#if ADC_LL_WORKAROUND_CLEAR_EOF_COUNTER
periph_module_reset(PERIPH_SARADC_MODULE);
adc_hal_digi_clr_eof();
#endif
adc_hal_digi_deinit();
if (handle->use_adc2) {
adc_lock_release(ADC_UNIT_2);
}
if (handle->use_adc1) {
adc_lock_release(ADC_UNIT_1);
}
sar_periph_ctrl_adc_continuous_power_release();
//release power manager lock
if (handle->pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_release(handle->pm_lock), ADC_TAG, "release pm_lock failed");
}
return ESP_OK;
}
esp_err_t adc_continuous_read(adc_continuous_handle_t handle, uint8_t *buf, uint32_t length_max, uint32_t *out_length, uint32_t timeout_ms)
{
ESP_RETURN_ON_FALSE(handle, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver isn't initialised");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_STARTED, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver is already stopped");
TickType_t ticks_to_wait;
esp_err_t ret = ESP_OK;
uint8_t *data = NULL;
size_t size = 0;
ticks_to_wait = timeout_ms / portTICK_PERIOD_MS;
if (timeout_ms == ADC_MAX_DELAY) {
ticks_to_wait = portMAX_DELAY;
}
data = xRingbufferReceiveUpTo(handle->ringbuf_hdl, &size, ticks_to_wait, length_max);
if (!data) {
ESP_LOGV(ADC_TAG, "No data, increase timeout");
ret = ESP_ERR_TIMEOUT;
*out_length = 0;
return ret;
}
memcpy(buf, data, size);
vRingbufferReturnItem(handle->ringbuf_hdl, data);
assert((size % 4) == 0);
*out_length = size;
return ret;
}
esp_err_t adc_continuous_deinit(adc_continuous_handle_t handle)
{
ESP_RETURN_ON_FALSE(handle, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver isn't initialised");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_INIT, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver is still running");
if (handle->ringbuf_hdl) {
vRingbufferDelete(handle->ringbuf_hdl);
handle->ringbuf_hdl = NULL;
free(handle->ringbuf_storage);
free(handle->ringbuf_struct);
}
if (handle->pm_lock) {
esp_pm_lock_delete(handle->pm_lock);
}
free(handle->rx_dma_buf);
free(handle->hal.rx_desc);
free(handle->hal_digi_ctrlr_cfg.adc_pattern);
adc_dma_deinit(handle->adc_dma);
free(handle);
handle = NULL;
adc_apb_periph_free();
return ESP_OK;
}
/*---------------------------------------------------------------
Digital controller setting
---------------------------------------------------------------*/
esp_err_t adc_continuous_config(adc_continuous_handle_t handle, const adc_continuous_config_t *config)
{
ESP_RETURN_ON_FALSE(handle, ESP_ERR_INVALID_STATE, ADC_TAG, "The driver isn't initialised");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_INIT, ESP_ERR_INVALID_STATE, ADC_TAG, "ADC continuous mode isn't in the init state, it's started already");
//Pattern related check
ESP_RETURN_ON_FALSE(config->pattern_num <= SOC_ADC_PATT_LEN_MAX, ESP_ERR_INVALID_ARG, ADC_TAG, "Max pattern num is %d", SOC_ADC_PATT_LEN_MAX);
for (int i = 0; i < config->pattern_num; i++) {
ESP_RETURN_ON_FALSE((config->adc_pattern[i].bit_width >= SOC_ADC_DIGI_MIN_BITWIDTH && config->adc_pattern->bit_width <= SOC_ADC_DIGI_MAX_BITWIDTH), ESP_ERR_INVALID_ARG, ADC_TAG, "ADC bitwidth not supported");
}
for (int i = 0; i < config->pattern_num; i++) {
#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
//we add this error log to hint users what happened
if (SOC_ADC_DIG_SUPPORTED_UNIT(config->adc_pattern[i].unit) == 0) {
ESP_LOGE(ADC_TAG, "ADC2 continuous mode is no longer supported, please use ADC1. Search for errata on espressif website for more details. You can enable CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3 to force use ADC2");
}
#endif //CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
#if !CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3
/**
* On all continuous mode supported chips, we will always check the unit to see if it's a continuous mode supported unit.
* However, on ESP32C3 and ESP32S3, we will jump this check, if `CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3` is enabled.
*/
ESP_RETURN_ON_FALSE(SOC_ADC_DIG_SUPPORTED_UNIT(config->adc_pattern[i].unit), ESP_ERR_INVALID_ARG, ADC_TAG, "Only support using ADC1 DMA mode");
#endif //#if !CONFIG_ADC_CONTINUOUS_FORCE_USE_ADC2_ON_C3_S3
}
ESP_RETURN_ON_FALSE(config->sample_freq_hz <= SOC_ADC_SAMPLE_FREQ_THRES_HIGH && config->sample_freq_hz >= SOC_ADC_SAMPLE_FREQ_THRES_LOW, ESP_ERR_INVALID_ARG, ADC_TAG, "ADC sampling frequency out of range");
#if CONFIG_IDF_TARGET_ESP32
ESP_RETURN_ON_FALSE(config->format == ADC_DIGI_OUTPUT_FORMAT_TYPE1, ESP_ERR_INVALID_ARG, ADC_TAG, "Please use type1");
#elif CONFIG_IDF_TARGET_ESP32S2
if (config->conv_mode == ADC_CONV_BOTH_UNIT || config->conv_mode == ADC_CONV_ALTER_UNIT) {
ESP_RETURN_ON_FALSE(config->format == ADC_DIGI_OUTPUT_FORMAT_TYPE2, ESP_ERR_INVALID_ARG, ADC_TAG, "Please use type2");
} else if (config->conv_mode == ADC_CONV_SINGLE_UNIT_1 || config->conv_mode == ADC_CONV_SINGLE_UNIT_2) {
ESP_RETURN_ON_FALSE(config->format == ADC_DIGI_OUTPUT_FORMAT_TYPE1, ESP_ERR_INVALID_ARG, ADC_TAG, "Please use type1");
}
#else
ESP_RETURN_ON_FALSE(config->format == ADC_DIGI_OUTPUT_FORMAT_TYPE2, ESP_ERR_INVALID_ARG, ADC_TAG, "Please use type2");
#endif
uint32_t clk_src_freq_hz = 0;
esp_clk_tree_src_get_freq_hz(ADC_DIGI_CLK_SRC_DEFAULT, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &clk_src_freq_hz);
handle->hal_digi_ctrlr_cfg.adc_pattern_len = config->pattern_num;
handle->hal_digi_ctrlr_cfg.sample_freq_hz = config->sample_freq_hz;
handle->hal_digi_ctrlr_cfg.conv_mode = config->conv_mode;
memcpy(handle->hal_digi_ctrlr_cfg.adc_pattern, config->adc_pattern, config->pattern_num * sizeof(adc_digi_pattern_config_t));
handle->hal_digi_ctrlr_cfg.clk_src = ADC_DIGI_CLK_SRC_DEFAULT;
handle->hal_digi_ctrlr_cfg.clk_src_freq_hz = clk_src_freq_hz;
const int atten_uninitialized = 999;
handle->adc1_atten = atten_uninitialized;
handle->adc2_atten = atten_uninitialized;
handle->use_adc1 = 0;
handle->use_adc2 = 0;
uint32_t adc1_chan_mask = 0;
uint32_t adc2_chan_mask = 0;
for (int i = 0; i < config->pattern_num; i++) {
const adc_digi_pattern_config_t *pat = &config->adc_pattern[i];
if (pat->unit == ADC_UNIT_1) {
handle->use_adc1 = 1;
adc1_chan_mask |= BIT(pat->channel);
if (handle->adc1_atten == atten_uninitialized) {
handle->adc1_atten = pat->atten;
} else if (handle->adc1_atten != pat->atten) {
return ESP_ERR_INVALID_ARG;
}
} else if (pat->unit == ADC_UNIT_2) {
handle->use_adc2 = 1;
adc2_chan_mask |= BIT(pat->channel);
if (handle->adc2_atten == atten_uninitialized) {
handle->adc2_atten = pat->atten;
} else if (handle->adc2_atten != pat->atten) {
return ESP_ERR_INVALID_ARG;
}
}
}
if (handle->use_adc1) {
adc_digi_gpio_init(ADC_UNIT_1, adc1_chan_mask);
}
if (handle->use_adc2) {
adc_digi_gpio_init(ADC_UNIT_2, adc2_chan_mask);
}
return ESP_OK;
}
esp_err_t adc_continuous_register_event_callbacks(adc_continuous_handle_t handle, const adc_continuous_evt_cbs_t *cbs, void *user_data)
{
ESP_RETURN_ON_FALSE(handle && cbs, ESP_ERR_INVALID_ARG, ADC_TAG, "invalid argument");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_INIT, ESP_ERR_INVALID_STATE, ADC_TAG, "ADC continuous mode isn't in the init state, it's started already");
#if CONFIG_ADC_CONTINUOUS_ISR_IRAM_SAFE
if (cbs->on_conv_done) {
ESP_RETURN_ON_FALSE(esp_ptr_in_iram(cbs->on_conv_done), ESP_ERR_INVALID_ARG, ADC_TAG, "on_conv_done callback not in IRAM");
}
if (cbs->on_pool_ovf) {
ESP_RETURN_ON_FALSE(esp_ptr_in_iram(cbs->on_pool_ovf), ESP_ERR_INVALID_ARG, ADC_TAG, "on_pool_ovf callback not in IRAM");
}
#endif
handle->cbs.on_conv_done = cbs->on_conv_done;
handle->cbs.on_pool_ovf = cbs->on_pool_ovf;
handle->user_data = user_data;
return ESP_OK;
}
esp_err_t adc_continuous_flush_pool(adc_continuous_handle_t handle)
{
ESP_RETURN_ON_FALSE(handle, ESP_ERR_INVALID_ARG, ADC_TAG, "invalid argument");
ESP_RETURN_ON_FALSE(handle->fsm == ADC_FSM_INIT, ESP_ERR_INVALID_STATE, ADC_TAG, "ADC continuous mode isn't in the init state, it's started already");
size_t actual_size = 0;
uint8_t *old_data = NULL;
while ((old_data = xRingbufferReceiveUpTo(handle->ringbuf_hdl, &actual_size, 0, handle->ringbuf_size))) {
vRingbufferReturnItem(handle->ringbuf_hdl, old_data);
}
return ESP_OK;
}
esp_err_t adc_continuous_io_to_channel(int io_num, adc_unit_t * const unit_id, adc_channel_t * const channel)
{
return adc_io_to_channel(io_num, unit_id, channel);
}
esp_err_t adc_continuous_channel_to_io(adc_unit_t unit_id, adc_channel_t channel, int * const io_num)
{
return adc_channel_to_io(unit_id, channel, io_num);
}
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