Diff: Ricker.cpp

Revision:

0:5684eed14bda

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Ricker.cpp	Fri Mar 11 18:28:13 2011 +0000
@@ -0,0 +1,83 @@
+/*
+    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 RIT
+// (note, only goes to milliseconds level not microseconds!)
+
+#include "Ricker.h"
+
+namespace AjK {
+
+// Create a RickerSys controller.
+RickerSys _rickerSys;
+
+// Nice and simple ISR, just call the class standard handler.
+extern "C" void RIT_IRQHandler(void) __irq 
+{
+    _rickerSys.isr();    
+}
+
+RickerSys::RickerSys()
+{    
+    LPC_SC->PCONP |= (1UL << 16);   // RIT On
+    
+    switch ((LPC_SC->PCLKSEL1 >> 26) & 0x3) {
+        case 0: LPC_RIT->RICOMPVAL = (SystemCoreClock / 4 / 1000); break; /* CCLK / 4 */
+        case 1: LPC_RIT->RICOMPVAL = (SystemCoreClock / 1 / 1000); break; /* CCLK / 1 */
+        case 2: LPC_RIT->RICOMPVAL = (SystemCoreClock / 2 / 1000); break; /* CCLK / 2 */
+        case 3: LPC_RIT->RICOMPVAL = (SystemCoreClock / 8 / 1000); break; /* CCLK / 8 */
+    }
+    
+    NVIC_EnableIRQ(RIT_IRQn);
+    LPC_RIT->RICTRL = 0x0000000A;
+}
+
+void 
+RickerSys::addTicker(Ricker *t)
+{
+    rickers.push_back(t);   
+}
+
+void 
+RickerSys::delTicker(Ricker *t)
+{
+    for (list<Ricker *>::iterator itor = rickers.begin(); itor != rickers.end(); ++itor) {
+        if ((*itor) == t) {
+            itor = rickers.erase(itor);
+            return;
+        }
+    }
+}
+
+void 
+RickerSys::isr(void)
+{
+    if (!rickers.empty()) {  
+        for (list<Ricker *>::iterator itor = rickers.begin(); itor != rickers.end(); ++itor) {
+            (*itor)->tick();
+        }
+    }
+    
+    LPC_RIT->RICTRL |= 0x1; /* Dismiss the IRQ. */    
+}    
+
+}; // namespace AjK ends.