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https://github.com/espressif/esp-idf.git
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46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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/*
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* SPDX-FileCopyrightText: 2022 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 <stdint.h>
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#include "sys/queue.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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* SLC2 DMA Desc struct, aka lldesc_t
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*
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* --------------------------------------------------------------
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* | own | EoF | sub_sof | 5'b0 | length [11:0] | size [11:0] |
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* --------------------------------------------------------------
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* | buf_ptr [31:0] |
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* --------------------------------------------------------------
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* | next_desc_ptr [31:0] |
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* --------------------------------------------------------------
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*/
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/* this bitfield is start from the LSB!!! */
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typedef struct lldesc_s {
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volatile uint32_t size : 12,
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length: 12,
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offset: 5, /* h/w reserved 5bit, s/w use it as offset in buffer */
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sosf : 1, /* start of sub-frame */
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eof : 1, /* end of frame */
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owner : 1; /* hw or sw */
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volatile const uint8_t *buf; /* point to buffer data */
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union {
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volatile uint32_t empty;
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STAILQ_ENTRY(lldesc_s) qe; /* pointing to the next desc */
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};
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} lldesc_t;
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#ifdef __cplusplus
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}
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#endif
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