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285 lines
11 KiB
C
285 lines
11 KiB
C
// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// DO NOT USE THESE APIS IN ANY APPLICATIONS
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// GDMA driver is not public for end users, but for ESP-IDF developpers.
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#pragma once
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#include <stdbool.h>
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#include "soc/gdma_channel.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 Enumeration of peripherals which have the DMA capability
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* @note Some peripheral might not be available on certain chip, please refer to `soc_caps.h` for detail.
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*
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*/
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typedef enum {
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GDMA_TRIG_PERIPH_M2M, /*!< GDMA trigger peripheral: M2M */
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GDMA_TRIG_PERIPH_UART, /*!< GDMA trigger peripheral: UART */
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GDMA_TRIG_PERIPH_SPI, /*!< GDMA trigger peripheral: SPI */
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GDMA_TRIG_PERIPH_I2S, /*!< GDMA trigger peripheral: I2S */
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GDMA_TRIG_PERIPH_AES, /*!< GDMA trigger peripheral: AES */
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GDMA_TRIG_PERIPH_SHA, /*!< GDMA trigger peripheral: SHA */
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GDMA_TRIG_PERIPH_ADC, /*!< GDMA trigger peripheral: ADC */
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GDMA_TRIG_PERIPH_DAC, /*!< GDMA trigger peripheral: DAC */
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GDMA_TRIG_PERIPH_LCD, /*!< GDMA trigger peripheral: LCD */
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GDMA_TRIG_PERIPH_CAM /*!< GDMA trigger peripheral: CAM */
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} gdma_trigger_peripheral_t;
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/**
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* @brief Enumeration of GDMA channel direction
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*
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*/
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typedef enum {
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GDMA_CHANNEL_DIRECTION_TX, /*!< GDMA channel direction: TX */
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GDMA_CHANNEL_DIRECTION_RX, /*!< GDMA channel direction: RX */
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} gdma_channel_direction_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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gdma_channel_handle_t sibling_chan; /*!< DMA sibling channel handle (NULL means having sibling is not necessary) */
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gdma_channel_direction_t direction; /*!< DMA channel direction */
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struct {
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int reserve_sibling: 1; /*!< If set, DMA channel allocator would prefer to allocate new channel in a new pair, and reserve sibling channel for future use */
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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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*/
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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 */
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intptr_t tx_eof_desc_addr; /*!< EOF descriptor address of TX channel */
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};
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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_channel`
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* @param event_data GDMA event data
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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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*/
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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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*/
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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_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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*/
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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_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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gdma_trigger_peripheral_t periph; /*!< Target peripheral which will trigger DMA operations */
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int instance_id; /*!< Peripheral instance ID. Supported IDs are listed in `soc/gdma_channel.h`, e.g. SOC_GDMA_TRIG_PERIPH_UART0 */
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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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* @note value of `peri` must be selected from `gdma_trigger_peripheral_t` enum.
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* e.g. GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_UART,0)
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*
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*/
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#define GDMA_MAKE_TRIGGER(peri, id) \
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(gdma_trigger_t) { .periph = peri, .instance_id = SOC_##peri##id }
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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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} gdma_strategy_config_t;
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/**
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* @brief Create GDMA channel
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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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*
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* @param[in] config Pointer to a collection of configurations for allocating GDMA channel
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* @param[out] ret_chan Returnned channel handle
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* @return
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* - ESP_OK: Create DMA channel successfully
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* - ESP_ERR_INVALID_ARG: Create DMA channel failed because of invalid argument
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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_channel(const gdma_channel_alloc_config_t *config, gdma_channel_handle_t *ret_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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*
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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_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_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 Apply channel strategy for GDMA channel
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*
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* @param dma_chan GDMA channel handle, allocated by `gdma_new_channel`
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* @param 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 Delete GDMA channel
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* @note If you call `gdma_new_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_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 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 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_channel`
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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 ID successfully
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* - ESP_ERR_INVALID_ARG: Get GDMA channel 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_channel_id(gdma_channel_handle_t dma_chan, int *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_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_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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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_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_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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* @param[in] dma_chan GDMA channel handle, allocated by `gdma_new_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_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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* @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_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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#ifdef __cplusplus
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}
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#endif
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