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https://github.com/espressif/esp-idf.git
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morris
493 lines
24 KiB
C
493 lines
24 KiB
C
/*
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* SPDX-FileCopyrightText: 2020-2025 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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#pragma once
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#include <stdbool.h>
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#include "esp_etm.h"
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#include "hal/gdma_types.h"
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#include "esp_err.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Type of GDMA channel handle
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*
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*/
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typedef struct gdma_channel_t *gdma_channel_handle_t;
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/**
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* @brief Collection of configuration items that used for allocating GDMA channel
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*
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*/
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typedef struct {
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struct {
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int isr_cache_safe: 1; /*!< If set, DMA channel allocator would allocate interrupt in cache-safe region, and ISR is serviceable when cache is disabled */
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} flags;
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} gdma_channel_alloc_config_t;
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/**
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* @brief Type of GDMA event data
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*/
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typedef struct {
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union {
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intptr_t rx_eof_desc_addr; /*!< EOF descriptor address of RX channel (only valid for EOF event) */
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intptr_t tx_eof_desc_addr; /*!< EOF descriptor address of TX channel (only valid for EOF event) */
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};
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struct {
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uint32_t abnormal_eof: 1; /*!< If set, means the current DMA block has an abnormal/error EOF flag being set.
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It doesn't mean GDMA goes into an error condition, but indicates peripheral (e.g. UHCI) goes into an abnormal state */
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uint32_t normal_eof: 1; /*!< If set, means the current DMA block has a normal/successful EOF flag being set */
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} flags;
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} gdma_event_data_t;
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/**
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* @brief Type of GDMA event callback
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* @param dma_chan GDMA channel handle, created from `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param event_data GDMA event data. Different event share the same data structure, but the caller may only use a few or none of the data members.
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* @param user_data User registered data from `gdma_register_tx_event_callbacks` or `gdma_register_rx_event_callbacks`
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*
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* @return Whether a task switch is needed after the callback function returns,
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* this is usually due to the callback wakes up some high priority task.
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*/
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typedef bool (*gdma_event_callback_t)(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data);
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/**
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* @brief Group of supported GDMA TX callbacks
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* @note The callbacks are all running under ISR environment
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*/
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typedef struct {
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gdma_event_callback_t on_trans_eof; /*!< Invoked when TX engine meets EOF descriptor */
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gdma_event_callback_t on_descr_err; /*!< Invoked when DMA encounters a descriptor error */
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} gdma_tx_event_callbacks_t;
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/**
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* @brief Group of supported GDMA RX callbacks
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* @note The callbacks are all running under ISR environment
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*/
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typedef struct {
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gdma_event_callback_t on_recv_eof; /*!< Invoked when RX engine meets EOF descriptor */
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gdma_event_callback_t on_descr_err; /*!< Invoked when DMA encounters a descriptor error */
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gdma_event_callback_t on_recv_done; /*!< Invoked when finished to receive one RX descriptor */
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} gdma_rx_event_callbacks_t;
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/**
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* @brief Type of GDMA engine trigger
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* @note It's recommended to initialize this structure with `GDMA_MAKE_TRIGGER`.
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*
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*/
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typedef struct {
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int instance_id; /*!< Peripheral instance ID. Supported IDs are listed in `hal/gdma_channel.h`, e.g. SOC_GDMA_TRIG_PERIPH_UHCI0 */
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int bus_id; /*!< Which system bus should the DMA attached to */
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} gdma_trigger_t;
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/**
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* @brief Helper macro to initialize GDMA trigger
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* @example
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* GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI,2)
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*/
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#define GDMA_MAKE_TRIGGER(peri, id) (gdma_trigger_t) {.instance_id = SOC_##peri##id, .bus_id = SOC_##peri##id##_BUS }
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/**
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* @brief A collection of strategy item that each GDMA channel could apply
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*
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*/
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typedef struct {
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bool owner_check; /*!< If set / clear, DMA channel enables / disables checking owner validity */
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bool auto_update_desc; /*!< If set / clear, DMA channel enables / disables hardware to update descriptor automatically (TX channel only) */
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bool eof_till_data_popped; /*!< If set / clear, DMA channel out_eof event is triggered on out / in DMA hardware fifo */
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} gdma_strategy_config_t;
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/**
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* @brief Create AHB-GDMA channel(s)
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* @note This API won't install interrupt service for the allocated channel.
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* If interrupt service is needed, user has to register GDMA event callback by `gdma_register_tx_event_callbacks` or `gdma_register_rx_event_callbacks`.
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* @note To allocate both TX and RX channels in a pair, pass non-NULL pointers for both ret_tx_chan and ret_rx_chan.
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* To allocate only one direction, pass NULL for the unwanted direction.
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* @note Allocation is atomic: if any channel fails to allocate, all partially allocated resources are cleaned up automatically.
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* Either all requested channels are successfully allocated, or the function fails with no channels allocated.
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*
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* @param[in] config Pointer to a collection of configurations for allocating GDMA channel
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* @param[out] ret_tx_chan Returned TX channel handle. Pass NULL if TX channel is not needed. Must not be NULL if ret_rx_chan is also NULL.
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* @param[out] ret_rx_chan Returned RX channel handle. Pass NULL if RX channel is not needed. Must not be NULL if ret_tx_chan is also NULL.
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* @return
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* - ESP_OK: Create DMA channel(s) successfully
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* - ESP_ERR_INVALID_ARG: Create DMA channel failed because both ret_tx_chan and ret_rx_chan are NULL
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* - ESP_ERR_NO_MEM: Create DMA channel failed because out of memory
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* - ESP_FAIL: Create DMA channel failed because of other error
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*/
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esp_err_t gdma_new_ahb_channel(const gdma_channel_alloc_config_t *config, gdma_channel_handle_t *ret_tx_chan, gdma_channel_handle_t *ret_rx_chan);
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/**
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* @brief Create AXI-GDMA channel(s)
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* @note This API won't install interrupt service for the allocated channel.
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* If interrupt service is needed, user has to register GDMA event callback by `gdma_register_tx_event_callbacks` or `gdma_register_rx_event_callbacks`.
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* @note To allocate both TX and RX channels in a pair, pass non-NULL pointers for both ret_tx_chan and ret_rx_chan.
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* To allocate only one direction, pass NULL for the unwanted direction.
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* @note Allocation is atomic: if any channel fails to allocate, all partially allocated resources are cleaned up automatically.
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* Either all requested channels are successfully allocated, or the function fails with no channels allocated.
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*
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* @param[in] config Pointer to a collection of configurations for allocating GDMA channel
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* @param[out] ret_tx_chan Returned TX channel handle. Pass NULL if TX channel is not needed. Must not be NULL if ret_rx_chan is also NULL.
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* @param[out] ret_rx_chan Returned RX channel handle. Pass NULL if RX channel is not needed. Must not be NULL if ret_tx_chan is also NULL.
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* @return
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* - ESP_OK: Create DMA channel(s) successfully
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* - ESP_ERR_INVALID_ARG: Create DMA channel failed because both ret_tx_chan and ret_rx_chan are NULL
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* - ESP_ERR_NO_MEM: Create DMA channel failed because out of memory
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* - ESP_FAIL: Create DMA channel failed because of other error
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*/
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esp_err_t gdma_new_axi_channel(const gdma_channel_alloc_config_t *config, gdma_channel_handle_t *ret_tx_chan, gdma_channel_handle_t *ret_rx_chan);
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/**
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* @brief Connect GDMA channel to trigger peripheral
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*
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* @note Suggest to use helper macro `GDMA_MAKE_TRIGGER` to construct parameter `trig_periph`. e.g. GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SHA,0)
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* @note Connecting to a peripheral will also reset the DMA FIFO and FSM automatically
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] trig_periph GDMA trigger peripheral
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* @return
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* - ESP_OK: Connect GDMA channel successfully
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* - ESP_ERR_INVALID_ARG: Connect GDMA channel failed because of invalid argument
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* - ESP_ERR_INVALID_STATE: Connect GDMA channel failed because DMA channel is working with another peripheral
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* - ESP_FAIL: Connect GDMA channel failed because of other error
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*/
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esp_err_t gdma_connect(gdma_channel_handle_t dma_chan, gdma_trigger_t trig_periph);
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/**
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* @brief Disconnect GMA channel from peripheral
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @return
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* - ESP_OK: Disconnect GDMA channel successfully
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* - ESP_ERR_INVALID_ARG: Disconnect GDMA channel failed because of invalid argument
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* - ESP_ERR_INVALID_STATE: Disconnect GDMA channel failed because DMA channel is not connected to any peripheral
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* - ESP_FAIL: Disconnect DMA channel failed because of other error
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*/
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esp_err_t gdma_disconnect(gdma_channel_handle_t dma_chan);
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/**
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* @brief Channel transfer configurations
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*/
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typedef struct {
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uint32_t max_data_burst_size; /*!< Set the max burst size when DMA read/write the data buffer.
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Set to 0 means to disable the data burst.
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Other value must be power of 2, e.g., 4/8/16/32/64 */
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bool access_ext_mem; /*!< Set this if the DMA transfer will access external memory */
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} gdma_transfer_config_t;
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/**
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* @brief Configure transfer parameters for a DMA channel
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*
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* @note It's highly recommended to enable the burst mode and set proper burst size for the DMA channel,
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* which can improve the performance in accessing external memory by a lot.
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*
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* @param[in] chan DMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] config Transfer configurations
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* @return
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* - ESP_OK: Configure DMA transfer parameters successfully
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* - ESP_ERR_INVALID_ARG: Configure DMA transfer parameters failed because of invalid argument
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* - ESP_FAIL: Configure DMA transfer parameters failed because of other error
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*/
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esp_err_t gdma_config_transfer(gdma_channel_handle_t dma_chan, const gdma_transfer_config_t *config);
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/**
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* @brief Get the alignment constraints for internal and external memory
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*
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* @note You should call this function after `gdma_config_transfer`, the later one can
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* adjust the alignment constraints based on various conditions, e.g. burst size, memory encryption, etc.
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* @note You can use returned alignment value to validate if a DMA buffer provided by the upper layer meets the constraints.
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* @note The returned alignment doesn't take the cache line size into account, if you want to do aligned memory allocation,
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* you should align the buffer size to the cache line size by yourself if the DMA buffer is behind a cache.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[out] int_mem_alignment Internal memory alignment
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* @param[out] ext_mem_alignment External memory alignment
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* @return
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* - ESP_OK: Get alignment constraints successfully
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* - ESP_ERR_INVALID_ARG: Get alignment constraints failed because of invalid argument
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* - ESP_FAIL: Get alignment constraints failed because of other error
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*/
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esp_err_t gdma_get_alignment_constraints(gdma_channel_handle_t dma_chan, size_t *int_mem_alignment, size_t *ext_mem_alignment);
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/**
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* @brief Apply channel strategy for GDMA channel
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] config Configuration of GDMA channel strategy
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* - ESP_OK: Apply channel strategy successfully
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* - ESP_ERR_INVALID_ARG: Apply channel strategy failed because of invalid argument
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* - ESP_FAIL: Apply channel strategy failed because of other error
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*/
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esp_err_t gdma_apply_strategy(gdma_channel_handle_t dma_chan, const gdma_strategy_config_t *config);
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/**
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* @brief Set GDMA channel priority
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*
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* @note By default, all GDMA channels are with the same priority: 0. Channels with the same priority are served in round-robin manner.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] priority Priority of GDMA channel, higher value means higher priority
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* @return
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* - ESP_OK: Set GDMA channel priority successfully
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* - ESP_ERR_INVALID_ARG: Set GDMA channel priority failed because of invalid argument, e.g. priority out of range [0,GDMA_LL_CHANNEL_MAX_PRIORITY]
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* - ESP_FAIL: Set GDMA channel priority failed because of other error
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*/
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esp_err_t gdma_set_priority(gdma_channel_handle_t dma_chan, uint32_t priority);
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/**
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* @brief Delete GDMA channel
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* @note If you call `gdma_new_ahb_channel/gdma_new_axi_channel` several times for a same peripheral, make sure you call this API the same times.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @return
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* - ESP_OK: Delete GDMA channel successfully
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* - ESP_ERR_INVALID_ARG: Delete GDMA channel failed because of invalid argument
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* - ESP_FAIL: Delete GDMA channel failed because of other error
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*/
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esp_err_t gdma_del_channel(gdma_channel_handle_t dma_chan);
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/**
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* @brief Get the group ID and the channel ID
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*
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* @note This API breaks the encapsulation of GDMA Channel Object.
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* With the returned group/channel ID, you can even bypass all other GDMA driver API and access Low Level API directly.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[out] group_id Returned group ID
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* @param[out] channel_id Returned channel ID
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* @return
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* - ESP_OK: Get GDMA channel/group ID successfully
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* - ESP_ERR_INVALID_ARG: Get GDMA channel/group ID failed because of invalid argument
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* - ESP_FAIL: Get GDMA channel ID failed because of other error
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*/
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esp_err_t gdma_get_group_channel_id(gdma_channel_handle_t dma_chan, int *group_id, int *channel_id);
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#define gdma_get_channel_id(dma_chan, channel_id) gdma_get_group_channel_id(dma_chan, NULL, channel_id)
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/**
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* @brief Set GDMA event callbacks for TX channel
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* @note This API will install GDMA interrupt service for the channel internally
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] cbs Group of callback functions
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* @param[in] user_data User data, which will be passed to callback functions directly
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* @return
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* - ESP_OK: Set event callbacks successfully
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* - ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument
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* - ESP_FAIL: Set event callbacks failed because of other error
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*/
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esp_err_t gdma_register_tx_event_callbacks(gdma_channel_handle_t dma_chan, gdma_tx_event_callbacks_t *cbs, void *user_data);
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/**
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* @brief Set GDMA event callbacks for RX channel
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* @note This API will install GDMA interrupt service for the channel internally
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] cbs Group of callback functions
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* @param[in] user_data User data, which will be passed to callback functions directly
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* @return
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* - ESP_OK: Set event callbacks successfully
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* - ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument
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* - ESP_FAIL: Set event callbacks failed because of other error
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*/
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esp_err_t gdma_register_rx_event_callbacks(gdma_channel_handle_t dma_chan, gdma_rx_event_callbacks_t *cbs, void *user_data);
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/**
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* @brief Set DMA descriptor address and start engine
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*
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* @note This function is allowed to run within ISR context
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* @note This function is also allowed to run when Cache is disabled, if `CONFIG_GDMA_CTRL_FUNC_IN_IRAM` is enabled
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] desc_base_addr Base address of descriptors (usually the descriptors are chained into a link or ring)
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* @return
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* - ESP_OK: Start DMA engine successfully
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* - ESP_ERR_INVALID_ARG: Start DMA engine failed because of invalid argument
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* - ESP_ERR_INVALID_STATE: Start DMA engine failed because of invalid state, e.g. the channel is controlled by ETM, so can't start it manually
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* - ESP_FAIL: Start DMA engine failed because of other error
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*/
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esp_err_t gdma_start(gdma_channel_handle_t dma_chan, intptr_t desc_base_addr);
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/**
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* @brief Stop DMA engine
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*
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* @note This function is allowed to run within ISR context
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* @note This function is also allowed to run when Cache is disabled, if `CONFIG_GDMA_CTRL_FUNC_IN_IRAM` is enabled
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @return
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* - ESP_OK: Stop DMA engine successfully
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* - ESP_ERR_INVALID_ARG: Stop DMA engine failed because of invalid argument
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* - ESP_ERR_INVALID_STATE: Stop DMA engine failed because of invalid state, e.g. the channel is controlled by ETM, so can't stop it manually
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* - ESP_FAIL: Stop DMA engine failed because of other error
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*/
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esp_err_t gdma_stop(gdma_channel_handle_t dma_chan);
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/**
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* @brief Make the appended descriptors be aware to the DMA engine
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*
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* @note This function is allowed to run within ISR context
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* @note This function is also allowed to run when Cache is disabled, if `CONFIG_GDMA_CTRL_FUNC_IN_IRAM` is enabled
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* @note This API could also resume a paused DMA engine, make sure new descriptors have been appended to the descriptor chain before calling it.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @return
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* - ESP_OK: Send append command to DMA engine successfully
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* - ESP_ERR_INVALID_ARG: Send append command to DMA engine failed because of invalid argument
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* - ESP_FAIL: Send append command to DMA engine failed because of other error
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*/
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esp_err_t gdma_append(gdma_channel_handle_t dma_chan);
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/**
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* @brief Reset DMA channel FIFO and internal finite state machine
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*
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* @note This function is allowed to run within ISR context
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* @note This function is also allowed to run when Cache is disabled, if `CONFIG_GDMA_CTRL_FUNC_IN_IRAM` is enabled
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* @note Resetting a DMA channel won't break the connection with the target peripheral
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @return
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* - ESP_OK: DMA channel reset successfully
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* - ESP_ERR_INVALID_ARG: DMA channel reset failed due to invalid arguments
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* - ESP_FAIL: DMA channel reset failed due to other errors
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*/
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esp_err_t gdma_reset(gdma_channel_handle_t dma_chan);
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#if SOC_GDMA_SUPPORT_ETM
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/**
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* @brief GDMA ETM event configuration
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*/
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typedef struct {
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gdma_etm_event_type_t event_type; /*!< GDMA ETM event type */
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} gdma_etm_event_config_t;
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/**
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* @brief Get the ETM event for GDMA channel
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*
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* @note The created ETM event object can be deleted later by calling `esp_etm_del_event`
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] config GDMA ETM event configuration
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* @param[out] out_event Returned ETM event handle
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* @return
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* - ESP_OK: Get ETM event successfully
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* - ESP_ERR_INVALID_ARG: Get ETM event failed because of invalid argument
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* - ESP_ERR_NOT_SUPPORTED: Get ETM event failed because the GDMA hardware doesn't support ETM event
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* - ESP_FAIL: Get ETM event failed because of other error
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*/
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esp_err_t gdma_new_etm_event(gdma_channel_handle_t dma_chan, const gdma_etm_event_config_t *config, esp_etm_event_handle_t *out_event);
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/**
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* @brief GDMA ETM task configuration
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*/
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typedef struct {
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gdma_etm_task_type_t task_type; /*!< GDMA ETM task type */
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} gdma_etm_task_config_t;
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/**
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* @brief Get the ETM task for GDMA channel
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*
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* @note The created ETM task object can be deleted later by calling `esp_etm_del_task`
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* @note If the GDMA task (e.g. start/stop) is controlled by ETM, then you can't use `gdma_start`/`gdma_stop` to control it.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] config GDMA ETM task configuration
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* @param[out] out_task Returned ETM task handle
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* @return
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* - ESP_OK: Get ETM task successfully
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* - ESP_ERR_INVALID_ARG: Get ETM task failed because of invalid argument
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* - ESP_ERR_NOT_SUPPORTED: Get ETM task failed because the gdma hardware doesn't support ETM task
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* - ESP_FAIL: Get ETM task failed because of other error
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*/
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esp_err_t gdma_new_etm_task(gdma_channel_handle_t dma_chan, const gdma_etm_task_config_t *config, esp_etm_task_handle_t *out_task);
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#endif // SOC_GDMA_SUPPORT_ETM
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/**
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* @brief Get the mask of free M2M trigger IDs
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*
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* @note On some ESP targets (e.g. ESP32C3/S3), DMA trigger used for memory copy can be any of valid peripheral's trigger ID,
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* which can bring conflict if the peripheral is also using the same trigger ID. This function can return the free IDs
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* for memory copy, at the runtime.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[out] mask Returned mask of free M2M trigger IDs
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* @return
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* - ESP_OK: Get free M2M trigger IDs successfully
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* - ESP_ERR_INVALID_ARG: Get free M2M trigger IDs failed because of invalid argument
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* - ESP_FAIL: Get free M2M trigger IDs failed because of other error
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*/
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esp_err_t gdma_get_free_m2m_trig_id_mask(gdma_channel_handle_t dma_chan, uint32_t *mask);
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#if SOC_GDMA_SUPPORT_CRC
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/**
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* @brief CRC Calculator configuration
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*/
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typedef struct {
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uint32_t init_value; /*!< CRC initial value */
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uint32_t crc_bit_width; /*!< CRC bit width */
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uint32_t poly_hex; /*!< Polynomial Formula, in hex */
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bool reverse_data_mask; /*!< Reverse data mask, used when you want to reverse the input data (a.k.a, refin) */
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} gdma_crc_calculator_config_t;
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/**
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* @brief Configure CRC Calculator
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*
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* @note This function must be called before `gdma_start`.
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* @note The CRC Calculator will reset itself automatically if the DMA stops and starts again.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[in] config CRC Calculator configuration
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* @return
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* - ESP_OK: Configure CRC Calculator successfully
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* - ESP_ERR_INVALID_ARG: Configure CRC Calculator failed because of invalid argument
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* - ESP_FAIL: Configure CRC Calculator failed because of other error
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*/
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esp_err_t gdma_config_crc_calculator(gdma_channel_handle_t dma_chan, const gdma_crc_calculator_config_t *config);
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/**
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* @brief Get CRC Calculator result
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*
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* @note You need to call this function before a new DMA transaction starts, otherwise the CRC results may be overridden.
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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
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* @param[out] result Returned CRC result
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* @return
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* - ESP_OK: Get CRC result successfully
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* - ESP_ERR_INVALID_ARG: Get CRC result failed because of invalid argument
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* - ESP_FAIL: Get CRC result failed because of other error
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*/
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esp_err_t gdma_crc_get_result(gdma_channel_handle_t dma_chan, uint32_t *result);
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#endif // SOC_GDMA_SUPPORT_CRC
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#if SOC_GDMA_SUPPORT_WEIGHTED_ARBITRATION
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/**
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* @brief Set GDMA channel weight (0 ~ 15), default weight is 1
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*
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* @note Once weight arbitration is enabled, The arbitrator will allocate the corresponding number of tokens based on the weight of each channel.
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* You need to set weights for each channel. If the weight is 0, the channel requests will no longer be responded to.
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* @note If channels have different weights, the channel with a larger weight can get a larger bandwidth.
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* e.g. if channel A has weight 2, channel B has weight 3 and channel C has weight 4, the percentage of bandwidth allocated to channel A is 2/9,
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* the percentage of bandwidth allocated to channel B is 3/9, and the percentage of bandwidth allocated to channel C is 4/9.
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* @note Weighted arbitration is different from priority arbitration. "Weight" is used after comparing "priority"
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|
* After the priority comparison, then arbitrator checks whether there are still unused tokens in the channel.
|
|
*
|
|
* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_ahb_channel/gdma_new_axi_channel`
|
|
* @param[in] weight Weight of GDMA channel, higher value means higher priority in weighted arbitration.
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|
* @return
|
|
* - ESP_OK: Set GDMA channel weight successfully
|
|
* - ESP_ERR_INVALID_ARG: Set GDMA channel weight failed because of invalid argument. e.g. weight out of range [0,GDMA_LL_CHANNEL_MAX_WEIGHT]
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|
* - ESP_FAIL: Set GDMA channel weight failed because of other error
|
|
*/
|
|
esp_err_t gdma_set_weight(gdma_channel_handle_t dma_chan, uint32_t weight);
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|
#endif // SOC_GDMA_SUPPORT_WEIGHTED_ARBITRATION
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|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
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