#ifndef ucoo_utils_rate_limit_tcc #define ucoo_utils_rate_limit_tcc // ucoolib - Microcontroller object oriented library. {{{ // // Copyright (C) 2015 Nicolas Schodet // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. // // }}} #include "ucoo/common.hh" namespace ucoo { template RateLimit::RateLimit (const Timer &timer) : timer_ (timer) { static_assert ((Timer::max & (Timer::max + 1)) == 0, "timer max value plus one should be a power of two"); } template RateLimit::RateLimit (const Timer &timer, int rate_num, int rate_denum) : RateLimit (timer) { set_limit (rate_num, rate_denum); } template void RateLimit::set_limit (int rate_num, int rate_denum) { int freq = timer_.get_freq_hz (); interval_ = freq * rate_denum / rate_num; ucoo::assert (interval_ <= Timer::max / 2 + 1); next_ = timer_.get_value (); } template bool RateLimit::operator () () { unsigned int val = timer_.get_value (); const unsigned int sign_bit = Timer::max & ~(Timer::max >> 1); if ((val - next_) & sign_bit) return false; else { next_ = val + interval_; return true; } } template void RateLimit::refresh () { unsigned int val = timer_.get_value (); const unsigned int sign_bit = Timer::max & ~(Timer::max >> 1); if (!((val - next_) & sign_bit)) next_ = val; } template void RateLimit::reset () { next_ = timer_.get_value () + interval_; } } // namespace ucoo #endif // ucoo_utils_rate_limit_tcc