esp-idf/components/usb/usb_private.c

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1.1 KiB
C
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/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "esp_heap_caps.h"
#include "esp_dma_utils.h"
#include "usb_private.h"
#include "usb/usb_types_ch9.h"
urb_t *urb_alloc(size_t data_buffer_size, int num_isoc_packets)
{
urb_t *urb = heap_caps_calloc(1, sizeof(urb_t) + (sizeof(usb_isoc_packet_desc_t) * num_isoc_packets), MALLOC_CAP_DEFAULT);
void *data_buffer;
size_t real_size;
esp_dma_malloc(data_buffer_size, 0, &data_buffer, &real_size);
if (urb == NULL || data_buffer == NULL) {
goto err;
}
// Cast as dummy transfer so that we can assign to const fields
usb_transfer_dummy_t *dummy_transfer = (usb_transfer_dummy_t *)&urb->transfer;
dummy_transfer->data_buffer = data_buffer;
dummy_transfer->data_buffer_size = real_size;
dummy_transfer->num_isoc_packets = num_isoc_packets;
return urb;
err:
heap_caps_free(urb);
heap_caps_free(data_buffer);
return NULL;
}
void urb_free(urb_t *urb)
{
if (urb == NULL) {
return;
}
heap_caps_free(urb->transfer.data_buffer);
heap_caps_free(urb);
}