A set of classes that mimic the behaviour of Mbed Ticker class but using TIMER0, TIMER1, TIMER2 and the RIT.
Ticker0Sys.cpp
- Committer:
- AjK
- Date:
- 2011-02-11
- Revision:
- 1:e60d949ec09a
File content as of revision 1:e60d949ec09a:
/* Copyright (c) 2011 Andy Kirkham 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. */ // Mimic Mbed's Ticker class but using TIMER1 // (note, only goes to milliseconds level not microseconds!) #include "TickersSys.h" namespace AjK { // Create a Ticker0 controller. Ticker0Sys _ticker0Sys; // Nice and simple ISR, just call the class standard handler. extern "C" void TIMER0_IRQHandler(void) __irq { _ticker0Sys.isr(); } Ticker0Sys::Ticker0Sys(void) { LPC_SC->PCONP |= (1UL << 1); // TIM0 On LPC_SC->PCLKSEL0 |= (3UL << 2); // CCLK/8 = 12MHz LPC_TIM0->PR = 11; // TC clocks at 1MHz. LPC_TIM0->MR0 = 1000; // Match at 1kHz. LPC_TIM0->MCR |= 1; // Generate an interrupt. LPC_TIM0->TCR = 1; // Enable Timer1 to count. NVIC_EnableIRQ(TIMER0_IRQn); } void Ticker0Sys::addTicker(Ticker0 *t) { tickers.push_back(t); } void Ticker0Sys::delTicker(Ticker0 *t) { for (list<Ticker0 *>::iterator itor = tickers.begin(); itor != tickers.end(); ++itor) { if ((*itor) == t) { itor = tickers.erase(itor); return; } } } void Ticker0Sys::isr(void) { LPC_TIM0->IR = 1; LPC_TIM0->MR0 += 1000; if (tickers.empty()) return; for (list<Ticker0 *>::iterator itor = tickers.begin(); itor != tickers.end(); ++itor) { (*itor)->tick(); } } }; // namespace AjK ends.