1 /* 2 * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #include "esp_heap_caps.h" 8 #include "usb_private.h" 9 #include "usb/usb_types_ch9.h" 10 urb_alloc(size_t data_buffer_size,size_t header_size,int num_isoc_packets)11urb_t *urb_alloc(size_t data_buffer_size, size_t header_size, int num_isoc_packets) 12 { 13 urb_t *urb = heap_caps_calloc(1, sizeof(urb_t) + (sizeof(usb_isoc_packet_desc_t) * num_isoc_packets), MALLOC_CAP_DEFAULT); 14 uint8_t *data_buffer = heap_caps_malloc(data_buffer_size + header_size, MALLOC_CAP_DMA); 15 if (urb == NULL || data_buffer == NULL) { 16 goto err; 17 } 18 urb->usb_host_header_size = header_size; //Indicate that this URB's data_buffer has a header in front of it. 19 //Case as dummy transfer to write to initialize const fields 20 usb_transfer_dummy_t *dummy_transfer = (usb_transfer_dummy_t *)&urb->transfer; 21 dummy_transfer->data_buffer = (uint8_t *)(data_buffer + header_size); 22 dummy_transfer->data_buffer_size = data_buffer_size; 23 dummy_transfer->num_isoc_packets = num_isoc_packets; 24 return urb; 25 err: 26 heap_caps_free(urb); 27 heap_caps_free(data_buffer); 28 return NULL; 29 } 30 urb_free(urb_t * urb)31void urb_free(urb_t *urb) 32 { 33 if (urb == NULL) { 34 return; 35 } 36 heap_caps_free((uint8_t *)(urb->transfer.data_buffer - urb->usb_host_header_size)); 37 heap_caps_free(urb); 38 } 39
