kopia lustrzana https://github.com/espressif/esp-idf
48 wiersze
1.6 KiB
C
48 wiersze
1.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2022 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 "soc/lldesc.h"
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#include "esp_private/gdma.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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/**
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* @brief Start a GDMA transfer on the shared crypto DMA channel
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*
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* @note Will allocate a GDMA channel for AES & SHA if no such channel is already allocated
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*
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* @param input Input linked list descriptor
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* @param output Output linked list descriptor
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* @param peripheral Crypto peripheral to connect the DMA to, either GDMA_TRIG_PERIPH_AES or
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* GDMA_TRIG_PERIPH_SHA
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* @return esp_err_t ESP_FAIL if no GDMA channel available
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*/
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esp_err_t esp_crypto_shared_gdma_start(const lldesc_t *input, const lldesc_t *output, gdma_trigger_peripheral_t peripheral);
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/**
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* @brief Frees any shared crypto DMA channel, if esp_crypto_shared_gdma_start is called after
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* this, new GDMA channels will be allocated.
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*
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* @note Function is meant to be called from user code, and thus takes AES/SHA lock.
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* This means this function should not be called from code which already takes these locks,
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* i.e. inside our AES/SHA code.
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*
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* If you are continously using AES/SHA (e.g. because of a wifi connection) then it's not recommended
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* to use this API. Freeing the channel is mainly for use cases where you are finished with the crypto peripherals
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* and need the DMA channel for other peripherals. An example would be doing some processing after disconnecting WiFi
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*/
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void esp_crypto_shared_gdma_free(void);
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#ifdef __cplusplus
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}
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#endif
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