// io-hub - Modular Input/Output. {{{ // // Copyright (C) 2013 Nicolas Schodet // // APBTeam: // Web: http://apbteam.org/ // Email: team AT apbteam DOT org // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 2 of the License, or // (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. // // }}} #include "chrono.hh" #include #include Chrono::Chrono (int duration_ms) : duration_ms_ (duration_ms), started_ (false) { } void Chrono::start () { started_ = true; rcc_peripheral_enable_clock (&RCC_APB1ENR, RCC_APB1ENR_TIM2EN); TIM2_PSC = 2 * rcc_ppre1_frequency / 1000 - 1; // 1 ms prescaler TIM2_ARR = 3600 * 1000; TIM2_EGR = TIM_EGR_UG; TIM2_CR1 = TIM_CR1_OPM | TIM_CR1_CEN; } int Chrono::remaining_time_ms () const { int now = 0; if (started_) now = TIM2_CNT; return duration_ms_ - now; }