128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
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// Copyright 2015-2016 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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// 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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#ifndef _DRIVER_DMA_H_
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#define _DRIVER_DMA_H__
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#include <esp_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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/** \defgroup Driver_APIs Driver APIs
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* @brief Driver APIs
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*/
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/** @addtogroup Driver_APIs
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* @{
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*/
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/**
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* @brief DMA queue description.
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*/
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typedef struct {
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uint32_t block_size: 12;
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uint32_t data_length: 12;
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uint32_t unused: 5;
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uint32_t sub_sof: 1;
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uint32_t eof: 1;
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uint32_t owner: 1;
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uint32_t buf_ptr;
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uint32_t next_link_ptr;
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} dma_queue_t;
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/**
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* @brief DMA element description
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*/
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typedef struct {
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uint32_t *buffer_addr;
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dma_queue_t *first_queue;
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dma_queue_t *last_queue;
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dma_queue_t backup_queue;
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} dma_element_t;
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/**
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* @brief DMA ping-pong buffer object description
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*/
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typedef struct {
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dma_element_t *ping;
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dma_element_t *pong;
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uint32_t len;
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uint32_t queue_cnt;
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} ping_pong_buf_t;
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/**
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* @brief Create a ping-pong buffer object used by DMA.
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*
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* @param [in] bufLen
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* Set the buffer length.
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* --------------------
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* | ping | Pong |
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* --------------------
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* | bufLen | bufLen |
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* --------------------
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*
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* @return uint32*, NULL:indicates parameter error, others indicates ping-pong buffer address.
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*/
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ping_pong_buf_t* dma_buf_create(uint32_t bufLen);
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/**
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* @brief Reset the dma buffer length.
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*
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* @param [in] obj
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* Pointer to a struct ping_pong_buf_t that indicates the object length to be reset to bufLen.
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*
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* @return uint32*, ESP_FAIL:indicates parameter error, ESP_OK :indicates success.
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*/
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esp_err_t dma_buf_len_reset(ping_pong_buf_t *obj);
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/**
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* @brief Set the buffer length before the start.
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*
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* @param [in] obj
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* Pointer to a struct spi_dma_attr_t.
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* @param [in] len
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* Set the transmit length .
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*
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* @return uint32*, ESP_FAIL:indicates parameter error, ESP_OK: indicates success.
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*/
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esp_err_t dma_buf_len_set(ping_pong_buf_t *obj, dma_element_t *element, uint32_t len);
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/**
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* @brief Destroy the ping-pong buffer instance.
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*
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* @param [in] obj
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* Pointer to a struct ping_pong_buf_t that indicates the object to be destroy.
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*
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* @return NULL
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*/
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void dma_buf_destroy(ping_pong_buf_t *obj);
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/**
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* @}
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*/
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif // __DMA_H__
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