refactor(dac): rename LL APIs and introduce sintx manager

components/esp_driver_dac/dac_common.c

@@ -36,7 +36,7 @@ static _Atomic dac_channel_fsm_t s_dac_chan_fsm[SOC_DAC_CHAN_NUM] = {
     [0 ... SOC_DAC_CHAN_NUM - 1] = DAC_CHAN_FSM_IDLE,
 };
 
-esp_err_t dac_priv_register_channel(dac_channel_t chan_id)
+esp_err_t dac_priv_channel_register(dac_channel_t chan_id)
 {
     ESP_RETURN_ON_FALSE(IS_VALID_DAC_CHANNEL(chan_id), ESP_ERR_INVALID_ARG, TAG, "channel id is invalid");
 
@@ -49,7 +49,7 @@ esp_err_t dac_priv_register_channel(dac_channel_t chan_id)
     }
 }
 
-esp_err_t dac_priv_deregister_channel(dac_channel_t chan_id)
+esp_err_t dac_priv_channel_deregister(dac_channel_t chan_id)
 {
     ESP_RETURN_ON_FALSE(IS_VALID_DAC_CHANNEL(chan_id), ESP_ERR_INVALID_ARG, TAG, "channel id is invalid");
 
@@ -62,7 +62,7 @@ esp_err_t dac_priv_deregister_channel(dac_channel_t chan_id)
     }
 }
 
-esp_err_t dac_priv_enable_channel(dac_channel_t chan_id)
+esp_err_t dac_priv_channel_enable(dac_channel_t chan_id, dac_data_source_t source)
 {
     ESP_RETURN_ON_FALSE(IS_VALID_DAC_CHANNEL(chan_id), ESP_ERR_INVALID_ARG, TAG, "channel id is invalid");
 
@@ -71,8 +71,9 @@ esp_err_t dac_priv_enable_channel(dac_channel_t chan_id)
         gpio_num_t gpio_num = (gpio_num_t)dac_periph_signal.dac_channel_io_num[chan_id];
         gpio_config_as_analog(gpio_num);
         DAC_ENTER_CRITICAL();
-        dac_ll_power_on(chan_id);
-        dac_ll_rtc_sync_by_adc(false);
+        dac_ll_pad_set_data_source(chan_id, source);
+        dac_ll_sync_by_adc(false);
+        dac_ll_pad_power_on(chan_id);
         DAC_EXIT_CRITICAL();
         atomic_store(&s_dac_chan_fsm[chan_id], DAC_CHAN_FSM_ENABLED);
         return ESP_OK;
@@ -82,14 +83,14 @@ esp_err_t dac_priv_enable_channel(dac_channel_t chan_id)
     }
 }
 
-esp_err_t dac_priv_disable_channel(dac_channel_t chan_id)
+esp_err_t dac_priv_channel_disable(dac_channel_t chan_id)
 {
     ESP_RETURN_ON_FALSE(IS_VALID_DAC_CHANNEL(chan_id), ESP_ERR_INVALID_ARG, TAG, "channel id is invalid");
 
     dac_channel_fsm_t expected_fsm = DAC_CHAN_FSM_ENABLED;
     if (atomic_compare_exchange_strong(&s_dac_chan_fsm[chan_id], &expected_fsm, DAC_CHAN_FSM_WAIT)) {
         DAC_ENTER_CRITICAL();
-        dac_ll_power_down(chan_id);
+        dac_ll_pad_power_down(chan_id);
         DAC_EXIT_CRITICAL();
         atomic_store(&s_dac_chan_fsm[chan_id], DAC_CHAN_FSM_REGISTERED);
         return ESP_OK;
@@ -99,6 +100,141 @@ esp_err_t dac_priv_disable_channel(dac_channel_t chan_id)
     }
 }
 
+/*---------------------------------------------------------------
+                Cosine (Sintx) generator management
+---------------------------------------------------------------*/
+/**
+ * The cosine wave generator is a single shared resource: every channel that outputs a cosine wave
+ * uses the same generator, and therefore the same frequency. On some targets, the same Sintx generator
+ * also serves the direct (DC) software output. The tone and DC modes are mutually exclusive there.
+ * This manager reference counts the generator, enforces the mode exclusion and the single shared
+ * frequency.
+ */
+
+typedef enum {
+    DAC_SINTX_MODE_TONE = 0,    /* cosine wave output */
+#if SOC_DAC_DC_VIA_SINTX
+    DAC_SINTX_MODE_DC,          /* direct (DC) software output */
+#endif
+} dac_sintx_mode_t;
+
+typedef struct {
+    dac_sintx_mode_t mode;
+    uint32_t ref_cnt;
+    uint32_t freq;
+} dac_sintx_state_t;
+
+static dac_sintx_state_t s_dac_sintx_state;
+
+typedef struct {
+#if SOC_DAC_SINTX_HAS_TIMER_TARGET
+    uint32_t timer_target;
+#endif
+    uint32_t fstep;
+} dac_sintx_freq_hw_t;
+
+/* Due to frequency aliasing, fstep values above the Nyquist limit (2^16)/2, are effectively invalid */
+#define DAC_SINTX_FSTEP_MAX     0x8000
+
+/**
+ * @brief Compute Sintx hardware frequency parameters from the requested tone frequency.
+ */
+static __attribute__((const)) dac_sintx_freq_hw_t dac_priv_sintx_calc_freq(uint32_t freq_hz, uint32_t clk_freq_hz)
+{
+#if SOC_DAC_SINTX_HAS_TIMER_TARGET
+#error "Not implemented"
+#else
+    /* freq = clk * fstep / 2^16 */
+    uint64_t fstep = DAC_DIV_ROUND((uint64_t)freq_hz << 16, clk_freq_hz);
+    return (dac_sintx_freq_hw_t) {
+        .fstep = DAC_CLAMP(fstep, 1, DAC_SINTX_FSTEP_MAX),
+    };
+#endif
+}
+
+static inline void dac_priv_sintx_apply_freq(dac_sintx_freq_hw_t hw)
+{
+#if SOC_DAC_SINTX_HAS_TIMER_TARGET
+    dac_ll_cw_set_timer_target(hw.timer_target);
+#endif
+    dac_ll_cw_set_fstep(hw.fstep);
+}
+
+esp_err_t dac_priv_sintx_acquire_tone(uint32_t freq_hz, uint32_t clk_freq_hz, bool force_set_freq)
+{
+    dac_sintx_freq_hw_t hw_freq = dac_priv_sintx_calc_freq(freq_hz, clk_freq_hz);
+
+    esp_err_t ret = ESP_OK;
+    DAC_ENTER_CRITICAL();
+    if (s_dac_sintx_state.ref_cnt == 0) {
+        // We are the first user. Lock the generator in tone mode and start the generator.
+        s_dac_sintx_state.ref_cnt = 1;
+        s_dac_sintx_state.mode = DAC_SINTX_MODE_TONE;
+        s_dac_sintx_state.freq = freq_hz;
+
+        dac_priv_sintx_apply_freq(hw_freq);
+        dac_ll_cw_enable_tone();
+    } else if (s_dac_sintx_state.mode != DAC_SINTX_MODE_TONE) {
+        // The generator is busy in other mode. Conflict.
+        ret = ESP_ERR_INVALID_STATE;
+    } else if (s_dac_sintx_state.freq == freq_hz) {
+        // Other users already requested the same frequency. Just ride it.
+        s_dac_sintx_state.ref_cnt++;
+    } else if (force_set_freq) {
+        // Re-program the frequency.
+        s_dac_sintx_state.ref_cnt++;
+        s_dac_sintx_state.freq = freq_hz;
+
+        dac_ll_cw_disable();
+        dac_priv_sintx_apply_freq(hw_freq);
+        dac_ll_cw_enable_tone();
+    } else {
+        // Other users already requested a different frequency. Conflict.
+        ret = ESP_ERR_INVALID_STATE;
+    }
+    DAC_EXIT_CRITICAL();
+    return ret;
+}
+
+#if SOC_DAC_DC_VIA_SINTX
+esp_err_t dac_priv_sintx_acquire_dc(void)
+{
+    esp_err_t ret = ESP_OK;
+    DAC_ENTER_CRITICAL();
+    if (s_dac_sintx_state.ref_cnt == 0) {
+        // We are the first user. Lock the generator in DC mode and start the generator.
+        s_dac_sintx_state.ref_cnt = 1;
+        s_dac_sintx_state.mode = DAC_SINTX_MODE_DC;
+        dac_ll_cw_enable_dc();
+    } else if (s_dac_sintx_state.mode == DAC_SINTX_MODE_DC) {
+        // Other users already requested the DC mode. Just ride it.
+        s_dac_sintx_state.ref_cnt++;
+    } else {
+        // Other users already requested the cosine mode. Conflict.
+        ret = ESP_ERR_INVALID_STATE;
+    }
+    DAC_EXIT_CRITICAL();
+    return ret;
+}
+#endif // SOC_DAC_DC_VIA_SINTX
+
+esp_err_t dac_priv_sintx_release(void)
+{
+    esp_err_t ret = ESP_OK;
+    DAC_ENTER_CRITICAL();
+    if (s_dac_sintx_state.ref_cnt > 0) {
+        s_dac_sintx_state.ref_cnt--;
+        if (s_dac_sintx_state.ref_cnt == 0) {
+            // We are the last user. Stop the generator.
+            dac_ll_cw_disable();
+        }
+    } else {
+        ret = ESP_ERR_INVALID_STATE;
+    }
+    DAC_EXIT_CRITICAL();
+    return ret;
+}
+
 #if CONFIG_DAC_ENABLE_DEBUG_LOG
 __attribute__((constructor))
 static void dac_override_default_log_level(void)

components/esp_driver_dac/dac_continuous.c

@@ -219,7 +219,7 @@ esp_err_t dac_continuous_new_channels(const dac_continuous_config_t *cont_cfg, d
     /* Register the channels */
     dac_channel_mask_t registered_chan_mask = 0;
     DAC_CHANNEL_MASK_FOREACH(chan, cont_cfg->chan_mask) {
-        ESP_GOTO_ON_ERROR(dac_priv_register_channel(chan), err_dereg, TAG, "register dac channel %"PRIu32" failed", chan);
+        ESP_GOTO_ON_ERROR(dac_priv_channel_register(chan), err_dereg, TAG, "register dac channel %"PRIu32" failed", chan);
         registered_chan_mask |= BIT(chan);
     }
 
@@ -258,11 +258,6 @@ esp_err_t dac_continuous_new_channels(const dac_continuous_config_t *cont_cfg, d
     ESP_GOTO_ON_ERROR(dac_priv_dma_init(handle->cfg.clk_src, handle->cfg.freq_hz, handle->cfg.chan_mode == DAC_CHANNEL_MODE_ALTER, &cbs, handle),
                       err_desc, TAG, "Failed to initialize DAC DMA peripheral");
 
-    /* Connect DAC module to the DMA peripheral */
-    DAC_ENTER_CRITICAL();
-    dac_ll_digi_enable_dma(true);
-    DAC_EXIT_CRITICAL();
-
     /* FSM: WAIT -> REGISTERED */
     atomic_store(&s_dac_cont_fsm, DAC_CONT_FSM_REGISTERED);
 
@@ -287,7 +282,7 @@ err_free:
 err_dereg:
     /* Deregister registered channels */
     DAC_CHANNEL_MASK_FOREACH(chan, registered_chan_mask) {
-        dac_priv_deregister_channel(chan);
+        dac_priv_channel_deregister(chan);
     }
     /* FSM: WAIT -> IDLE */
     atomic_store(&s_dac_cont_fsm, DAC_CONT_FSM_IDLE);
@@ -308,11 +303,6 @@ esp_err_t dac_continuous_del_channels(dac_continuous_handle_t handle)
     /* Deinitialize DMA peripheral */
     ESP_RETURN_ON_ERROR(dac_priv_dma_deinit(), TAG, "Failed to deinitialize DAC DMA peripheral");
 
-    /* Disconnect DAC module from the DMA peripheral */
-    DAC_ENTER_CRITICAL();
-    dac_ll_digi_enable_dma(false);
-    DAC_EXIT_CRITICAL();
-
     /* Free allocated resources */
     s_dac_free_dma_desc(handle);
 
@@ -334,7 +324,7 @@ esp_err_t dac_continuous_del_channels(dac_continuous_handle_t handle)
 
     /* Deregister the channels */
     DAC_CHANNEL_MASK_FOREACH(chan, handle->cfg.chan_mask) {
-        dac_priv_deregister_channel(chan);
+        dac_priv_channel_deregister(chan);
     }
 
     free(handle);
@@ -386,14 +376,10 @@ esp_err_t dac_continuous_enable(dac_continuous_handle_t handle)
 #endif
 
     DAC_CHANNEL_MASK_FOREACH(chan, handle->cfg.chan_mask) {
-        dac_priv_enable_channel(chan);
+        dac_priv_channel_enable(chan, DAC_DATA_SOURCE_DMA);
     }
     dac_priv_dma_enable();
 
-    DAC_ENTER_CRITICAL();
-    dac_ll_digi_enable_dma(true);
-    DAC_EXIT_CRITICAL();
-
     /* FSM: WAIT -> ENABLED */
     atomic_store(&s_dac_cont_fsm, DAC_CONT_FSM_ENABLED);
     return ESP_OK;
@@ -421,12 +407,8 @@ esp_err_t dac_continuous_disable(dac_continuous_handle_t handle)
 
     dac_priv_dma_disable();
 
-    DAC_ENTER_CRITICAL();
-    dac_ll_digi_enable_dma(false);
-    DAC_EXIT_CRITICAL();
-
     DAC_CHANNEL_MASK_FOREACH(chan, handle->cfg.chan_mask) {
-        dac_priv_disable_channel(chan);
+        dac_priv_channel_disable(chan);
     }
 #ifdef CONFIG_PM_ENABLE
     esp_pm_lock_release(handle->pm_lock);

components/esp_driver_dac/dac_cosine.c

@@ -4,26 +4,36 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <stdatomic.h>
 #include <string.h>
 #include "dac_priv_common.h"
 #include "driver/dac_cosine.h"
-#include "hal/clk_tree_ll.h"
 #include "hal/dac_ll.h"
-#include "esp_clk_tree.h"
+#include "esp_private/esp_clk_tree_common.h"
 #include "esp_check.h"
 #include "esp_log.h"
 
+typedef enum {
+    DAC_COS_FSM_REGISTERED,
+    DAC_COS_FSM_ENABLED,
+    DAC_COS_FSM_WAIT,
+} dac_cosine_fsm_t;
+
 struct dac_cosine_s {
-    dac_cosine_config_t     cfg;        /*!< Cosine mode configurations */
-    bool                    is_started; /*!< Flag: is the channel started(not cosine wave generator) */
+    dac_cosine_config_t       cfg;        /*!< Cosine mode configurations */
+    _Atomic dac_cosine_fsm_t  fsm;        /*!< FSM state */
 };
 
-/* Cosine wave generator reference count
- * The cosine wave generator is shared by dac channels */
-static uint32_t s_cwg_refer_cnt = 0;
-
-/* The frequency of cosine wave generator */
-static uint32_t s_cwg_freq = 0;
+static bool dac_cosine_clk_src_is_supported(dac_cosine_clk_src_t clk_src)
+{
+    const dac_cosine_clk_src_t supported[] = SOC_DAC_COSINE_CLKS;
+    for (size_t i = 0; i < sizeof(supported) / sizeof(supported[0]); i++) {
+        if (clk_src == supported[i]) {
+            return true;
+        }
+    }
+    return false;
+}
 
 esp_err_t dac_cosine_new_channel(const dac_cosine_config_t *cos_cfg, dac_cosine_handle_t *ret_handle)
 {
@@ -31,45 +41,68 @@ esp_err_t dac_cosine_new_channel(const dac_cosine_config_t *cos_cfg, dac_cosine_
     DAC_NULL_POINTER_CHECK(cos_cfg);
     DAC_NULL_POINTER_CHECK(ret_handle);
     ESP_RETURN_ON_FALSE(IS_VALID_DAC_CHANNEL(cos_cfg->chan_id), ESP_ERR_INVALID_ARG, TAG, "invalid dac channel id");
-    ESP_RETURN_ON_FALSE(cos_cfg->freq_hz >= (130 / clk_ll_rc_fast_get_divider()), ESP_ERR_NOT_SUPPORTED, TAG, "The cosine wave frequency is too low");
-    ESP_RETURN_ON_FALSE((!s_cwg_freq) || cos_cfg->flags.force_set_freq || (cos_cfg->freq_hz == s_cwg_freq),
-                        ESP_ERR_INVALID_STATE, TAG, "The cosine wave frequency has set already, not allowed to update unless `force_set_freq` is set");
+    ESP_RETURN_ON_FALSE(cos_cfg->freq_hz > 0, ESP_ERR_INVALID_ARG, TAG, "invalid cosine wave frequency");
+
+    dac_cosine_clk_src_t clk_src = cos_cfg->clk_src ? : DAC_COSINE_CLK_SRC_DEFAULT;
+    ESP_RETURN_ON_FALSE(dac_cosine_clk_src_is_supported(clk_src), ESP_ERR_INVALID_ARG, TAG, "invalid DAC cosine clock source");
 
     esp_err_t ret = ESP_OK;
+
     /* Allocate cosine handle */
     dac_cosine_handle_t handle = heap_caps_calloc(1, sizeof(struct dac_cosine_s), DAC_MEM_ALLOC_CAPS);
     ESP_RETURN_ON_FALSE(handle, ESP_ERR_NO_MEM, TAG, "no memory for the dac cosine handle");
-    /* Assign configurations */
     handle->cfg = *cos_cfg;
-    if (handle->cfg.clk_src == 0) {
-        handle->cfg.clk_src = DAC_COSINE_CLK_SRC_DEFAULT;
-    }
-    /* Register the handle */
-    ESP_GOTO_ON_ERROR(dac_priv_register_channel(handle->cfg.chan_id), err1, TAG, "register dac channel %d failed", handle->cfg.chan_id);
+    handle->cfg.clk_src = clk_src;
+    atomic_store(&handle->fsm, DAC_COS_FSM_REGISTERED);
 
-    /* Get the cosine wave generator clock frequency */
-    uint32_t rtc_clk_freq = 0;
-    esp_clk_tree_src_get_freq_hz((soc_module_clk_t)handle->cfg.clk_src, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &rtc_clk_freq);
+    /* Acquire the generator clock and resolve its frequency */
+    uint32_t clk_freq = 0;
+    ESP_GOTO_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)handle->cfg.clk_src, true), err_handle, TAG, "enable clock failed");
+    ESP_GOTO_ON_ERROR(esp_clk_tree_src_get_freq_hz((soc_module_clk_t)handle->cfg.clk_src, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &clk_freq),
+                      err_clk, TAG, "get clock frequency failed");
 
-    if (rtc_clk_freq == 0) {
-        ESP_LOGW(TAG, "RTC clock calibration failed, using the approximate value as default");
-        rtc_clk_freq = SOC_CLK_RC_FAST_FREQ_APPROX;
+    ESP_GOTO_ON_ERROR(dac_priv_channel_register(cos_cfg->chan_id), err_clk, TAG, "register dac channel %d failed", cos_cfg->chan_id);
+
+    /* Claim the shared cosine wave generator in tone mode and program the wave frequency (this also
+     * starts the generator). Rejected if the direct-output path is in use or a different frequency
+     * is already set. */
+    ESP_GOTO_ON_ERROR(dac_priv_sintx_acquire_tone(cos_cfg->freq_hz, clk_freq, cos_cfg->flags.force_set_freq), err_dereg, TAG, "acquire cosine wave generator failed");
+
+    int16_t offset = cos_cfg->offset;
+    if (cos_cfg->phase == DAC_COSINE_PHASE_180) {
+        offset = -offset;
     }
+#if SOC_DAC_SINTX_LUT_SIGNED
+#error "not implemented"
+#else
+    const int16_t base_offset = 0;
+    /* Hardware DC register is signed: -128~127 */
+    const int16_t min_offset = -128, max_offset = 127;
+#endif
+    if (offset < min_offset || offset > max_offset) {
+        /* User-facing range: phase 0° → [min-B, max-B]; phase 180° → [B-max, B-min] */
+        const int16_t min_user = (cos_cfg->phase == DAC_COSINE_PHASE_0) ? (min_offset - base_offset) : (base_offset - max_offset);
+        const int16_t max_user = min_user + (max_offset - min_offset);
+        ESP_LOGW(TAG, "DAC cosine DC offset %d out of range [%d, %d], saturating",
+                 cos_cfg->offset, min_user, max_user);
+        offset = (offset < min_offset) ? min_offset : max_offset;
+    }
+
+    /* Set the per-channel cosine wave parameters. */
     DAC_ENTER_CRITICAL();
-    /* Set coefficients for cosine wave generator */
-    if ((!s_cwg_freq) || handle->cfg.flags.force_set_freq) {
-        dac_ll_cw_set_freq(handle->cfg.freq_hz, rtc_clk_freq);
-        s_cwg_freq = handle->cfg.freq_hz;
-    }
     dac_ll_cw_set_atten(handle->cfg.chan_id, handle->cfg.atten);
     dac_ll_cw_set_phase(handle->cfg.chan_id, handle->cfg.phase);
-    dac_ll_cw_set_dc_offset(handle->cfg.chan_id, handle->cfg.offset);
+    dac_ll_cw_set_offset(handle->cfg.chan_id, offset);
     DAC_EXIT_CRITICAL();
 
     *ret_handle = handle;
-    return ret;
+    return ESP_OK;
 
-err1:
+err_dereg:
+    dac_priv_channel_deregister(cos_cfg->chan_id);
+err_clk:
+    esp_clk_tree_enable_src((soc_module_clk_t)handle->cfg.clk_src, false);
+err_handle:
     free(handle);
     return ret;
 }
@@ -77,15 +110,15 @@ err1:
 esp_err_t dac_cosine_del_channel(dac_cosine_handle_t handle)
 {
     DAC_NULL_POINTER_CHECK(handle);
-    ESP_RETURN_ON_FALSE(!handle->is_started, ESP_ERR_INVALID_STATE, TAG,
-                        "the dac cosine generator is not stopped yet");
 
-    ESP_RETURN_ON_ERROR(dac_priv_deregister_channel(handle->cfg.chan_id), TAG,
+    dac_cosine_fsm_t expected_fsm = DAC_COS_FSM_REGISTERED;
+    ESP_RETURN_ON_FALSE(atomic_compare_exchange_strong(&handle->fsm, &expected_fsm, DAC_COS_FSM_WAIT),
+                        ESP_ERR_INVALID_STATE, TAG, "dac cosine is running");
+
+    ESP_RETURN_ON_ERROR(dac_priv_channel_deregister(handle->cfg.chan_id), TAG,
                         "deregister dac channel %d failed", handle->cfg.chan_id);
-    /* Clear the frequency if no channel using it */
-    if (!s_cwg_refer_cnt) {
-        s_cwg_freq = 0;
-    }
+    ESP_RETURN_ON_ERROR(dac_priv_sintx_release(), TAG, "release dac sintx generator failed");
+    ESP_RETURN_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)handle->cfg.clk_src, false), TAG, "disable clock failed");
     free(handle);
 
     return ESP_OK;
@@ -93,56 +126,42 @@ esp_err_t dac_cosine_del_channel(dac_cosine_handle_t handle)
 
 esp_err_t dac_cosine_start(dac_cosine_handle_t handle)
 {
-    esp_err_t ret = ESP_OK;
     DAC_NULL_POINTER_CHECK(handle);
-    ESP_RETURN_ON_FALSE(!handle->is_started, ESP_ERR_INVALID_STATE, TAG,
-                        "the dac channel has already started");
-    /* Acquire the cosine wave generator clock */
-    ESP_RETURN_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)handle->cfg.clk_src, true), TAG, "cosine clock enable failed");
-    /* Enabled DAC channel */
-    ESP_GOTO_ON_ERROR(dac_priv_enable_channel(handle->cfg.chan_id), err, TAG,
-                      "enable dac channel %d failed", handle->cfg.chan_id);
-    /* Enabled the cosine wave generator if no channel using it before */
-    DAC_ENTER_CRITICAL();
-    if (s_cwg_refer_cnt == 0) {
-        dac_ll_cw_generator_enable();
-    }
-    /* Connect the DAC channel to the cosine wave generator */
-    dac_ll_cw_enable_channel(handle->cfg.chan_id, true);
-    s_cwg_refer_cnt++;
-    handle->is_started = true;
-    DAC_EXIT_CRITICAL();
 
+    dac_cosine_fsm_t expected_fsm = DAC_COS_FSM_REGISTERED;
+    ESP_RETURN_ON_FALSE(atomic_compare_exchange_strong(&handle->fsm, &expected_fsm, DAC_COS_FSM_WAIT),
+                        ESP_ERR_INVALID_STATE, TAG, "dac cosine already started");
+
+    esp_err_t ret = ESP_OK;
+    /* The generator is already running; starting only powers on the pad so the wave reaches the output. */
+    ESP_GOTO_ON_ERROR(dac_priv_channel_enable(handle->cfg.chan_id, DAC_DATA_SOURCE_COSINE), err,
+                      TAG, "enable dac channel %d failed", handle->cfg.chan_id);
+
+    atomic_store(&handle->fsm, DAC_COS_FSM_ENABLED);
     return ESP_OK;
-
 err:
-    esp_clk_tree_enable_src((soc_module_clk_t)handle->cfg.clk_src, false);
+    atomic_store(&handle->fsm, DAC_COS_FSM_REGISTERED);
     return ret;
 }
 
 esp_err_t dac_cosine_stop(dac_cosine_handle_t handle)
 {
     DAC_NULL_POINTER_CHECK(handle);
-    ESP_RETURN_ON_FALSE(handle->is_started, ESP_ERR_INVALID_STATE, TAG,
-                        "the dac channel has already stopped");
 
-    /* Enabled DAC channel */
-    ESP_RETURN_ON_ERROR(dac_priv_disable_channel(handle->cfg.chan_id), TAG,
-                        "disable dac channel %d failed", handle->cfg.chan_id);
-    DAC_ENTER_CRITICAL();
-    /* Disconnect the DAC channel from the cosine wave generator */
-    dac_ll_cw_enable_channel(handle->cfg.chan_id, false);
-    s_cwg_refer_cnt--;
-    /* Disable the cosine wave generator if no channel using it */
-    if (s_cwg_refer_cnt == 0) {
-        dac_ll_cw_generator_disable();
-    }
-    handle->is_started = false;
-    DAC_EXIT_CRITICAL();
-    /* Release the cosine wave generator clock */
-    ESP_RETURN_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)handle->cfg.clk_src, false), TAG, "cosine clock disable failed");
+    dac_cosine_fsm_t expected_fsm = DAC_COS_FSM_ENABLED;
+    ESP_RETURN_ON_FALSE(atomic_compare_exchange_strong(&handle->fsm, &expected_fsm, DAC_COS_FSM_WAIT),
+                        ESP_ERR_INVALID_STATE, TAG, "dac cosine already stopped");
 
+    esp_err_t ret = ESP_OK;
+    /* Power off the pad; the generator keeps running */
+    ESP_GOTO_ON_ERROR(dac_priv_channel_disable(handle->cfg.chan_id), err,
+                      TAG, "disable dac channel %d failed", handle->cfg.chan_id);
+
+    atomic_store(&handle->fsm, DAC_COS_FSM_REGISTERED);
     return ESP_OK;
+err:
+    atomic_store(&handle->fsm, DAC_COS_FSM_ENABLED);
+    return ret;
 }
 
 uint8_t dac_cosine_get_bitwidth(dac_cosine_handle_t handle)

components/esp_driver_dac/dac_oneshot.c

@@ -29,14 +29,14 @@ esp_err_t dac_oneshot_new_channel(const dac_oneshot_config_t *oneshot_cfg, dac_o
     handle->cfg = *oneshot_cfg;
 
     /* Register and enable the dac channel */
-    ESP_GOTO_ON_ERROR(dac_priv_register_channel(oneshot_cfg->chan_id), err2, TAG, "register dac channel %d failed", oneshot_cfg->chan_id);
-    ESP_GOTO_ON_ERROR(dac_priv_enable_channel(oneshot_cfg->chan_id), err1, TAG, "enable dac channel %d failed", oneshot_cfg->chan_id);
+    ESP_GOTO_ON_ERROR(dac_priv_channel_register(oneshot_cfg->chan_id), err2, TAG, "register dac channel %d failed", oneshot_cfg->chan_id);
+    ESP_GOTO_ON_ERROR(dac_priv_channel_enable(oneshot_cfg->chan_id, DAC_DATA_SOURCE_DIRECT), err1, TAG, "enable dac channel %d failed", oneshot_cfg->chan_id);
 
     *ret_handle = handle;
     return ret;
 
 err1:
-    dac_priv_deregister_channel(oneshot_cfg->chan_id);
+    dac_priv_channel_deregister(oneshot_cfg->chan_id);
 err2:
     free(handle);
     return ret;
@@ -47,8 +47,8 @@ esp_err_t dac_oneshot_del_channel(dac_oneshot_handle_t handle)
     DAC_NULL_POINTER_CHECK(handle);
 
     /* Disable and deregister the channel */
-    ESP_RETURN_ON_ERROR(dac_priv_disable_channel(handle->cfg.chan_id), TAG, "disable dac channel %d failed", handle->cfg.chan_id);
-    ESP_RETURN_ON_ERROR(dac_priv_deregister_channel(handle->cfg.chan_id), TAG, "deregister dac channel %d failed", handle->cfg.chan_id);
+    ESP_RETURN_ON_ERROR(dac_priv_channel_disable(handle->cfg.chan_id), TAG, "disable dac channel %d failed", handle->cfg.chan_id);
+    ESP_RETURN_ON_ERROR(dac_priv_channel_deregister(handle->cfg.chan_id), TAG, "deregister dac channel %d failed", handle->cfg.chan_id);
 
     /* Free resources */
     free(handle);
@@ -64,7 +64,7 @@ esp_err_t dac_oneshot_output_voltage(dac_oneshot_handle_t handle, uint8_t digi_v
 
     /* Set the voltage by the digital value */
     DAC_ENTER_CRITICAL_SAFE();
-    dac_ll_update_output_value(handle->cfg.chan_id, digi_value);
+    dac_ll_pad_set_output_code(handle->cfg.chan_id, digi_value);
     DAC_EXIT_CRITICAL_SAFE();
 
     return ESP_OK;

components/esp_driver_dac/dac_priv_common.h

@@ -14,6 +14,8 @@
 #endif
 #include "freertos/FreeRTOS.h"
 #include "hal/dac_types.h"
+#include "hal/dac_types_private.h"
+#include "hal/dac_ll.h"
 #include "esp_log.h"
 #include "esp_check.h"
 #include "esp_err.h"
@@ -56,6 +58,11 @@ extern portMUX_TYPE dac_priv_spinlock;
 #define DAC_MEM_ALLOC_CAPS      MALLOC_CAP_DEFAULT
 #endif
 
+#define DAC_DIV_ROUND(n, d) (((n) + (d) / 2) / (d))
+#define DAC_DIV_CEIL(n, d) (((n) + (d) - 1) / (d))
+#define DAC_MAX(a, b) ((a) > (b) ? (a) : (b))
+#define DAC_CLAMP(x, min, max) ((x) < (min) ? (min) : ((x) > (max) ? (max) : (x)))
+
 /**
  * @brief Register dac channel in the driver, in case a same channel is reused by different modes
  *
@@ -65,7 +72,7 @@ extern portMUX_TYPE dac_priv_spinlock;
  *      - ESP_ERR_INVALID_ARG   The channel id is incorrect
  *      - ESP_OK                Register the channel success
  */
-esp_err_t dac_priv_register_channel(dac_channel_t chan_id);
+esp_err_t dac_priv_channel_register(dac_channel_t chan_id);
 
 /**
  * @brief Deregister dac channel in the driver
@@ -76,18 +83,19 @@ esp_err_t dac_priv_register_channel(dac_channel_t chan_id);
  *      - ESP_ERR_INVALID_ARG   The channel id is incorrect
  *      - ESP_OK                Deregister the channel success
  */
-esp_err_t dac_priv_deregister_channel(dac_channel_t chan_id);
+esp_err_t dac_priv_channel_deregister(dac_channel_t chan_id);
 
 /**
  * @brief Enable the DAC channel and turn on its power
  *
  * @param chan_id       DAC channel id
+ * @param source        Channel data source
  * @return
  *      - ESP_ERR_INVALID_STATE The channel has not been registered or already enabled
  *      - ESP_ERR_INVALID_ARG   The channel id is incorrect
  *      - ESP_OK                Enable the channel success
  */
-esp_err_t dac_priv_enable_channel(dac_channel_t chan_id);
+esp_err_t dac_priv_channel_enable(dac_channel_t chan_id, dac_data_source_t source);
 
 /**
  * @brief Disable the DAC channel and turn off its power
@@ -98,7 +106,56 @@ esp_err_t dac_priv_enable_channel(dac_channel_t chan_id);
  *      - ESP_ERR_INVALID_ARG   The channel id is incorrect
  *      - ESP_OK                Disable the channel success
  */
-esp_err_t dac_priv_disable_channel(dac_channel_t chan_id);
+esp_err_t dac_priv_channel_disable(dac_channel_t chan_id);
+
+/**
+ * @brief Acquire the shared cosine wave (Sintx/tone) generator (reference counted)
+ *
+ * @note  The cosine wave generator is a single shared resource: all DAC channels that output a
+ *        cosine wave share one generator (and thus one frequency). This claims the generator in tone
+ *        mode, programs the wave frequency, and starts the generator on the first acquire. The first
+ *        acquirer (or any acquirer passing `force_set_freq`) programs the frequency; a later acquirer
+ *        requesting a different frequency without `force_set_freq` is rejected. On targets where the
+ *        tone generator and the direct (DC) output share one Sintx generator, a tone acquire is also
+ *        rejected while the DC path is in use.
+ *
+ * @param[in] freq_hz         The cosine wave frequency in Hz
+ * @param[in] clk_freq_hz     The clock frequency that drives the generator in Hz
+ * @param[in] force_set_freq  Force (re)programming the frequency even if the generator is in use
+ * @return
+ *      - ESP_ERR_INVALID_STATE The generator is busy on a conflicting mode or frequency
+ *      - ESP_OK                Success
+ */
+esp_err_t dac_priv_sintx_acquire_tone(uint32_t freq_hz, uint32_t clk_freq_hz, bool force_set_freq);
+
+#if SOC_DAC_DC_VIA_SINTX
+/**
+ * @brief Acquire the shared Sintx generator for the direct (DC) software output (reference counted)
+ *
+ * @note  On some targets, the direct (DC) software output runs through the same Sintx generator as
+ *        the cosine wave output, so the two are mutually exclusive. This claims the generator in DC
+ *        mode and, on the first acquire, starts the Sintx timer that pushes the written DC value to
+ *        the pad.
+ *
+ * @return
+ *      - ESP_ERR_INVALID_STATE The generator is busy on the cosine path
+ *      - ESP_OK                Success
+ */
+esp_err_t dac_priv_sintx_acquire_dc(void);
+#endif // SOC_DAC_DC_VIA_SINTX
+
+/**
+ * @brief Release the shared Sintx generator (reference counted)
+ *
+ * @note  Releases one reference acquired by `dac_priv_sintx_acquire_tone()` or
+ *        `dac_priv_sintx_acquire_dc()`. The generator is stopped once the last reference is
+ *        released.
+ *
+ * @return
+ *      - ESP_ERR_INVALID_STATE The generator is not in use
+ *      - ESP_OK                Success
+ */
+esp_err_t dac_priv_sintx_release(void);
 
 #ifdef __cplusplus
 }

components/esp_driver_dac/esp32/dac_dma.c

@@ -16,6 +16,7 @@
 #include "freertos/FreeRTOS.h"
 #include "sdkconfig.h"
 #include "hal/adc_ll.h"
+#include "hal/dac_ll.h"
 #include "hal/i2s_hal.h"
 #include "hal/i2s_types.h"
 #include "hal/clk_tree_ll.h"
@@ -148,6 +149,7 @@ esp_err_t dac_priv_dma_init(soc_periph_dac_digi_clk_src_t clk_src, uint32_t freq
 
     ESP_GOTO_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)clk_src, true), err, TAG, "enable DAC digital clock source failed");
     s_ddp->clk_src = clk_src;
+    dac_ll_dma_clk_inv(true);
     ESP_GOTO_ON_ERROR(s_dac_priv_dma_set_clock(clk_src, freq_hz), err, TAG, "Failed to set clock of DMA peripheral");
 
     i2s_ll_enable_builtin_adc_dac(s_ddp->periph_dev, true);
@@ -188,6 +190,7 @@ esp_err_t dac_priv_dma_deinit(void)
     }
 
     if (s_ddp->clk_src) {
+        dac_ll_dma_clk_inv(false);
         ESP_RETURN_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)s_ddp->clk_src, false), TAG, "disable DAC digital clock source failed");
         s_ddp->clk_src = 0;
     }

components/esp_driver_dac/esp32s2/dac_dma.c

@@ -139,8 +139,8 @@ static esp_err_t s_dac_priv_dma_set_clock(soc_periph_dac_digi_clk_src_t clk_src,
     hal_utils_calc_clk_div_frac_accurate(&adc_clk_info, &adc_clk_div);
 
     /* Step 4: Set the clock coefficients */
-    dac_ll_digi_clk_inv(true);
-    dac_ll_digi_set_trigger_interval(interval); // secondary clock division
+    dac_ll_dma_clk_inv(true);
+    dac_ll_dma_set_timer_target(interval); // secondary clock division
     adc_ll_digi_controller_clk_div(adc_clk_div.integer - 1, adc_clk_div.denominator, adc_clk_div.numerator);
     adc_ll_digi_clk_sel((adc_continuous_clk_src_t)clk_src);
     return ESP_OK;
@@ -174,7 +174,7 @@ esp_err_t dac_priv_dma_init(soc_periph_dac_digi_clk_src_t clk_src, uint32_t freq
                       err, TAG, "Failed to allocate dma peripheral channel");
     s_ddp->dma_chan = spi_bus_get_dma_ctx(DAC_DMA_PERIPH_SPI_HOST)->rx_dma_chan.chan_id;
     spi_ll_enable_intr(s_ddp->periph_dev, SPI_LL_INTR_OUT_DONE | SPI_LL_INTR_OUT_TOTAL_EOF);
-    dac_ll_digi_set_convert_mode(is_alternate);
+    dac_ll_dma_enable_alternate_mode(is_alternate);
 
     s_ddp->cbs = *cbs;
     s_ddp->ctx = ctx;
@@ -211,6 +211,7 @@ esp_err_t dac_priv_dma_deinit(void)
     }
 
     if (s_ddp->clk_src) {
+        dac_ll_dma_clk_inv(false);
         ESP_RETURN_ON_ERROR(esp_clk_tree_enable_src((soc_module_clk_t)s_ddp->clk_src, false), TAG, "disable DAC digital clock source failed");
         s_ddp->clk_src = 0;
     }
@@ -224,12 +225,14 @@ static void s_dac_priv_dma_reset(void)
 {
     spi_ll_dma_tx_reset(s_ddp->periph_dev, s_ddp->dma_chan);
     spi_ll_dma_tx_fifo_reset(s_ddp->periph_dev);
+    dac_ll_dma_reset_fifo();
+    dac_ll_dma_reset_fsm();
 }
 
 void dac_priv_dma_enable(void)
 {
     s_dac_priv_dma_reset();
-    dac_ll_digi_trigger_output(true);
+    dac_ll_dma_enable_timer(true);
     esp_intr_enable(s_ddp->intr_handle);
 }
 
@@ -237,7 +240,7 @@ void dac_priv_dma_disable(void)
 {
     s_dac_priv_dma_reset();
     spi_ll_dma_tx_stop(s_ddp->periph_dev, s_ddp->dma_chan);
-    dac_ll_digi_trigger_output(false);
+    dac_ll_dma_enable_timer(false);
     esp_intr_disable(s_ddp->intr_handle);
 }
 
@@ -245,6 +248,7 @@ void dac_priv_dma_trans_start(uintptr_t desc_addr)
 {
     spi_ll_dma_tx_reset(s_ddp->periph_dev, s_ddp->dma_chan);
     spi_ll_dma_tx_fifo_reset(s_ddp->periph_dev);
+    dac_ll_dma_reset_fifo();
     spi_ll_dma_tx_start(s_ddp->periph_dev, s_ddp->dma_chan, (lldesc_t *)desc_addr);
 }