Simon Ford
/
TimerInterruptExample
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
Revision 0:a6ea53688962, committed 2010-02-09
- Comitter:
- simon
- Date:
- Tue Feb 09 11:00:52 2010 +0000
- Commit message:
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /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);
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Feb 09 11:00:52 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0