Diff: libs/SlowTicker.cpp

Revision:

0:31e91bb0ef3c

--- /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(); 
+    }
+}
+