esp-idf/components/driver/dac/dac_common.c
2022-10-25 17:14:59 +08:00

99 lines
3.1 KiB
C

/*
* 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"
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;
}