mirror of
https://github.com/espressif/esp-idf.git
synced 2025-11-03 22:08:28 +00:00
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
#include "sys/queue.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* SLC2 DMA Desc struct, aka lldesc_t
|
|
*
|
|
* --------------------------------------------------------------
|
|
* | own | EoF | sub_sof | 5'b0 | length [11:0] | size [11:0] |
|
|
* --------------------------------------------------------------
|
|
* | buf_ptr [31:0] |
|
|
* --------------------------------------------------------------
|
|
* | next_desc_ptr [31:0] |
|
|
* --------------------------------------------------------------
|
|
*/
|
|
|
|
/* this bitfield is start from the LSB!!! */
|
|
typedef struct lldesc_s {
|
|
volatile uint32_t size : 12,
|
|
length: 12,
|
|
offset: 5, /* h/w reserved 5bit, s/w use it as offset in buffer */
|
|
sosf : 1, /* start of sub-frame */
|
|
eof : 1, /* end of frame */
|
|
owner : 1; /* hw or sw */
|
|
volatile const uint8_t *buf; /* point to buffer data */
|
|
union {
|
|
volatile uint32_t empty;
|
|
STAILQ_ENTRY(lldesc_s) qe; /* pointing to the next desc */
|
|
};
|
|
} lldesc_t;
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|