A set of classes that mimic the behaviour of Mbed Ticker class but using TIMER0, TIMER1, TIMER2 and the RIT.
Diff: Ticker0Sys.cpp
- Revision:
- 1:e60d949ec09a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Ticker0Sys.cpp Fri Feb 11 11:35:49 2011 +0000 @@ -0,0 +1,79 @@ +/* + 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.