Diff: main.cpp

Revision:

0:a6ea53688962

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Feb 09 11:00:52 2010 +0000
@@ -0,0 +1,49 @@
+// Example to set up an interrupt based on the LPC TIMER0 match register, sford
+ 
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+DigitalOut irqled(LED2);
+
+void myhandler() {
+    // do something!
+    irqled = !irqled;
+    
+    // clear the TIMER0 interrupt
+    LPC_TIM0->IR = 1;
+}
+
+int main() {
+    // power up TIMER0 (PCONP[1])
+    LPC_SC->PCONP |= 1 << 1; 
+
+    // reset and set TIMER0 to timer mode
+    LPC_TIM0->TCR = 0x2;  
+    LPC_TIM0->CTCR = 0x0; 
+    
+    // set no prescaler
+    LPC_TIM0->PR = 0;
+
+    // calculate period (1 interrupt every second)
+    uint32_t period = SystemCoreClock / 4; 
+
+    // set match register and enable interrupt    
+	LPC_TIM0->MR0 = period;
+	LPC_TIM0->MCR |= 1 << 0;    // interrupt on match
+	LPC_TIM0->MCR |= 1 << 1;    // reset on match
+
+    // enable the vector in the interrupt controller
+    NVIC_SetVector(TIMER0_IRQn, (uint32_t)&myhandler);
+    NVIC_EnableIRQ(TIMER0_IRQn);
+
+    // start the timer
+    LPC_TIM0->TCR = 1;
+
+    // hang around!   
+    while(1) {
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(0.2);
+    }
+}