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39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2021 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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#include "esp_heap_caps.h"
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#include "usb_private.h"
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#include "usb/usb_types_ch9.h"
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urb_t *urb_alloc(size_t data_buffer_size, size_t header_size, int num_isoc_packets)
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{
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urb_t *urb = heap_caps_calloc(1, sizeof(urb_t) + (sizeof(usb_isoc_packet_desc_t) * num_isoc_packets), MALLOC_CAP_DEFAULT);
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uint8_t *data_buffer = heap_caps_malloc(data_buffer_size + header_size, MALLOC_CAP_DMA);
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if (urb == NULL || data_buffer == NULL) {
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goto err;
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}
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urb->usb_host_header_size = header_size; // Indicate that this URB's data_buffer has a header in front of it.
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// Case as dummy transfer to write to initialize const fields
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usb_transfer_dummy_t *dummy_transfer = (usb_transfer_dummy_t *)&urb->transfer;
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dummy_transfer->data_buffer = (uint8_t *)(data_buffer + header_size);
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dummy_transfer->data_buffer_size = data_buffer_size;
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dummy_transfer->num_isoc_packets = num_isoc_packets;
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return urb;
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err:
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heap_caps_free(urb);
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heap_caps_free(data_buffer);
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return NULL;
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}
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void urb_free(urb_t *urb)
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{
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if (urb == NULL) {
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return;
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}
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heap_caps_free((uint8_t *)(urb->transfer.data_buffer - urb->usb_host_header_size));
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heap_caps_free(urb);
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}
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