mirror of
https://github.com/gdsports/USBHost_t36
synced 2024-11-24 10:02:15 -05:00
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/* USB EHCI Host for Teensy 3.6
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* Copyright 2017 Paul Stoffregen (paul@pjrc.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <Arduino.h>
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#include "USBHost.h"
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// Memory allocation
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static Device_t memory_Device[3];
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static Pipe_t memory_Pipe[6] __attribute__ ((aligned(64)));
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static Transfer_t memory_Transfer[24] __attribute__ ((aligned(64)));
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static Device_t * free_Device_list = NULL;
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static Pipe_t * free_Pipe_list = NULL;
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static Transfer_t * free_Transfer_list = NULL;
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void USBHost::init_Device_Pipe_Transfer_memory(void)
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{
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Device_t *end_device = memory_Device + sizeof(memory_Device)/sizeof(Device_t);
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for (Device_t *device = memory_Device; device < end_device; device++) {
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free_Device(device);
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}
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Pipe_t *end_pipe = memory_Pipe + sizeof(memory_Pipe)/sizeof(Pipe_t);
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for (Pipe_t *pipe = memory_Pipe; pipe < end_pipe; pipe++) {
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free_Pipe(pipe);
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}
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Transfer_t *end_transfer = memory_Transfer + sizeof(memory_Transfer)/sizeof(Transfer_t);
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for (Transfer_t *transfer = memory_Transfer; transfer < end_transfer; transfer++) {
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free_Transfer(transfer);
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}
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}
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Device_t * USBHost::allocate_Device(void)
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{
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Device_t *device = free_Device_list;
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if (device) free_Device_list = *(Device_t **)device;
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return device;
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}
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void USBHost::free_Device(Device_t *device)
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{
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*(Device_t **)device = free_Device_list;
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free_Device_list = device;
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}
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Pipe_t * USBHost::allocate_Pipe(void)
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{
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Pipe_t *pipe = free_Pipe_list;
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if (pipe) free_Pipe_list = *(Pipe_t **)pipe;
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return pipe;
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}
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void USBHost::free_Pipe(Pipe_t *pipe)
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{
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*(Pipe_t **)pipe = free_Pipe_list;
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free_Pipe_list = pipe;
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}
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Transfer_t * USBHost::allocate_Transfer(void)
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{
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Transfer_t *transfer = free_Transfer_list;
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if (transfer) free_Transfer_list = *(Transfer_t **)transfer;
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return transfer;
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}
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void USBHost::free_Transfer(Transfer_t *transfer)
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{
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*(Transfer_t **)transfer = free_Transfer_list;
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free_Transfer_list = transfer;
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}
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