ESP-IDF
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#include <stdint.h>
#include "sys/queue.h"
lldesc_s
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/esp_rom/include/esp_rom_lldesc.h
 
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/* * 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
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