add log2_of and use this function in get_period_head
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hathach
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41fee0f488
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861f02943d
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@ -1,45 +1,40 @@
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/*
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* common.h
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*
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* Created on: Nov 26, 2012
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* Author: hathach
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*/
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/**************************************************************************/
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/*!
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@file common.h
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@author hathach (tinyusb.org)
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/*
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* Software License Agreement (BSD License)
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* Copyright (c) 2013, hathach (tinyusb.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the tinyUSB stack.
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*/
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@section LICENSE
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/** \file
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* \brief Common Header File
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*
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* \note TBD
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*/
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Software License Agreement (BSD License)
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Copyright (c) 2013, hathach (tinyusb.org)
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holders nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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This file is part of the tinyusb stack.
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*/
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/**************************************************************************/
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/** \defgroup Group_Common Common Files
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* @{
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@ -171,6 +166,20 @@ static inline uint32_t offset4k(uint32_t value)
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return (value & 0xFFFUL);
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}
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//------------- Mathematics -------------//
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static inline uint8_t log2_of(uint32_t value) ATTR_ALWAYS_INLINE ATTR_CONST;
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static inline uint8_t log2_of(uint32_t value)
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{
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uint8_t result = 0; // log2 of value is its MSB's position
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while (value >>= 1)
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{
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result++;
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}
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return result;
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}
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#ifdef __cplusplus
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}
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#endif
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@ -711,10 +711,8 @@ STATIC_ INLINE_ ehci_qhd_t* get_async_head(uint8_t hostid)
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STATIC_ INLINE_ ehci_link_t* get_period_head(uint8_t hostid, uint8_t interval_ms)
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{
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return (ehci_link_t*) (ehci_data.period_head_arr[ hostid_to_data_idx(hostid) ] +
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(interval_ms < 2 ? 0 :
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interval_ms < 4 ? 1 :
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interval_ms < EHCI_FRAMELIST_SIZE ? 2 : 3));
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return (ehci_link_t*) (&ehci_data.period_head_arr[ hostid_to_data_idx(hostid) ]
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[ log2_of( min8_of(EHCI_FRAMELIST_SIZE, interval_ms) ) ] );
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}
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STATIC_ INLINE_ ehci_qhd_t* get_control_qhd(uint8_t dev_addr)
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