53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
// Copyright 2010-2019 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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#pragma once
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#include <stdbool.h>
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#include "sdkconfig.h"
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#if CONFIG_IDF_TARGET_ESP32
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#include "esp32/rom/lldesc.h"
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#elif CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/rom/lldesc.h"
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#endif
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//the size field has 12 bits, but 0 not for 4096.
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//to avoid possible problem when the size is not word-aligned, we only use 4096-4 per desc.
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/** Maximum size of data in the buffer that a DMA descriptor can hold. */
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#define LLDESC_MAX_NUM_PER_DESC (4096-4)
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/**
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* Generate a linked list pointing to a (huge) buffer in an descriptor array.
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*
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* The caller should ensure there is enough size to hold the array, by calling
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* ``lldesc_get_required_num``.
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*
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* @param out_desc_array Output of a descriptor array, the head should be fed to the DMA.
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* @param buffer Buffer for the descriptors to point to.
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* @param size Size (or length for TX) of the buffer
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* @param isrx The RX DMA may require the buffer to be word-aligned, set to true for a RX link, otherwise false.
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*/
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void lldesc_setup_link(lldesc_t *out_desc_array, const void *buffer, int size, bool isrx);
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/**
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* Get the number of descriptors required for a given buffer size.
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*
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* @param data_size Size to check descriptor num.
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*
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* @return Numbers required.
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*/
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static inline int lldesc_get_required_num(int data_size)
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{
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return (data_size + LLDESC_MAX_NUM_PER_DESC - 1) / LLDESC_MAX_NUM_PER_DESC;
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}
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