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