ESP-IDF
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Outline
#include <stdint.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "soc/soc_caps.h"
#include "soc/dac_periph.h"
#include "hal/dac_types.h"
#include "hal/dac_ll.h"
#include "driver/rtc_io.h"
#include "esp_check.h"
#include "dac_priv_common.h"
dac_channel_info_t
s_dac_chan
dac_spinlock
TAG
dac_priv_register_channel(dac_channel_t, const char *)
dac_priv_deregister_channel(dac_channel_t)
dac_priv_enable_channel(dac_channel_t)
dac_priv_disable_channel(dac_channel_t)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/esp_driver_dac/dac_common.c
 
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/* * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <stdint.h> #include <string.h> #include "freertos/FreeRTOS.h" #include "soc/soc_caps.h" #include "soc/dac_periph.h" #include "hal/dac_types.h" #include "hal/dac_ll.h" #include "driver/rtc_io.h" #include "esp_check.h" #include "dac_priv_common.h"10 includes typedef struct { bool in_use; bool is_enabled; const char *mode; }{ ... } dac_channel_info_t; static dac_channel_info_t s_dac_chan[SOC_DAC_CHAN_NUM] = { [0 ... SOC_DAC_CHAN_NUM - 1] = { .in_use = false, .is_enabled = false, .mode = NULL, }{...} }{...}; /* Global dac spin lock for the whole DAC driver */ portMUX_TYPE dac_spinlock = portMUX_INITIALIZER_UNLOCKED; static const char *TAG = "dac_common"; esp_err_t dac_priv_register_channel(dac_channel_t chan_id, const char *mode_name) { ESP_RETURN_ON_FALSE(chan_id < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "channel id is invalid"); DAC_NULL_POINTER_CHECK(mode_name); esp_err_t ret = ESP_OK; if (!s_dac_chan[chan_id].in_use) { s_dac_chan[chan_id].in_use = true; s_dac_chan[chan_id].mode = mode_name; }{...} else { ret = ESP_ERR_INVALID_STATE; }{...} if (ret != ESP_OK) { ESP_LOGE(TAG, "dac channel %d has been registered by %s", chan_id, s_dac_chan[chan_id].mode); }{...} return ret; }{ ... } esp_err_t dac_priv_deregister_channel(dac_channel_t chan_id) { ESP_RETURN_ON_FALSE(chan_id < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "channel id is invalid"); ESP_RETURN_ON_FALSE(!s_dac_chan[chan_id].is_enabled, ESP_ERR_INVALID_STATE, TAG, "the channel is still enabled"); esp_err_t ret = ESP_OK; if (s_dac_chan[chan_id].in_use) { s_dac_chan[chan_id].in_use = false; s_dac_chan[chan_id].mode = NULL; }{...} else { ret = ESP_ERR_INVALID_STATE; }{...} return ret; }{ ... } esp_err_t dac_priv_enable_channel(dac_channel_t chan_id) { ESP_RETURN_ON_FALSE(chan_id < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "channel id is invalid"); ESP_RETURN_ON_FALSE(s_dac_chan[chan_id].in_use, ESP_ERR_INVALID_STATE, TAG, "the channel is not registered"); gpio_num_t gpio_num = (gpio_num_t)dac_periph_signal.dac_channel_io_num[chan_id]; rtc_gpio_init(gpio_num); rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_DISABLED); rtc_gpio_pullup_dis(gpio_num); rtc_gpio_pulldown_dis(gpio_num); DAC_RTC_ENTER_CRITICAL(); dac_ll_power_on(chan_id); dac_ll_rtc_sync_by_adc(false); DAC_RTC_EXIT_CRITICAL(); s_dac_chan[chan_id].is_enabled = true; return ESP_OK; }{ ... } esp_err_t dac_priv_disable_channel(dac_channel_t chan_id) { ESP_RETURN_ON_FALSE(chan_id < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "channel id is invalid"); ESP_RETURN_ON_FALSE(s_dac_chan[chan_id].in_use, ESP_ERR_INVALID_STATE, TAG, "the channel is not registered"); gpio_num_t gpio_num = (gpio_num_t)dac_periph_signal.dac_channel_io_num[chan_id]; rtc_gpio_deinit(gpio_num); DAC_RTC_ENTER_CRITICAL(); dac_ll_power_down(chan_id); DAC_RTC_EXIT_CRITICAL(); s_dac_chan[chan_id].is_enabled = false; return ESP_OK; }{ ... }
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