Fork of Smoothie to port to mbed non-LPC targets.
Fork of Smoothie by
Diff: libs/SlowTicker.cpp
- Revision:
- 0:31e91bb0ef3c
- Child:
- 2:1df0b61d3b5a
diff -r 000000000000 -r 31e91bb0ef3c libs/SlowTicker.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libs/SlowTicker.cpp Tue Jul 31 21:11:18 2012 +0000 @@ -0,0 +1,53 @@ +/* + This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl). + Smoothie 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 3 of the License, or (at your option) any later version. + Smoothie 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 Smoothie. If not, see <http://www.gnu.org/licenses/>. +*/ + +using namespace std; +#include <vector> +#include "libs/nuts_bolts.h" +#include "libs/Module.h" +#include "libs/Kernel.h" +#include "SlowTicker.h" +#include "libs/Hook.h" +#include "system_LPC17xx.h" // mbed.h lib + + +SlowTicker* global_slow_ticker; + +SlowTicker::SlowTicker(){ + this->max_frequency = 1; + global_slow_ticker = this; + LPC_SC->PCONP |= (1 << 22); // Power Ticker ON + LPC_TIM2->MR0 = 10000; // Initial dummy value for Match Register + LPC_TIM2->MCR = 3; // Match on MR0, reset on MR0 + LPC_TIM2->TCR = 1; // Enable interrupt + NVIC_EnableIRQ(TIMER2_IRQn); // Enable interrupt handler +} + +void SlowTicker::set_frequency( int frequency ){ + LPC_TIM2->MR0 = (SystemCoreClock/4)/frequency; // SystemCoreClock/4 = Timer increments in a second + LPC_TIM2->TCR = 3; // Reset + LPC_TIM2->TCR = 1; // Reset +} + +void SlowTicker::tick(){ + for (int i=0; i<this->hooks.size(); i++){ + Hook* hook = this->hooks.at(i); + hook->counter += ( hook->frequency / this->max_frequency ); + if( hook->counter > 0 ){ + hook->counter-=1; + hook->call(); + } + } +} + +extern "C" void TIMER2_IRQHandler (void){ + if((LPC_TIM2->IR >> 0) & 1){ // If interrupt register set for MR0 + LPC_TIM2->IR |= 1 << 0; // Reset it + global_slow_ticker->tick(); + } +} +