File content as of revision 0:31e91bb0ef3c:

/*  
      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(); 
    }
}