Simon Ford / Mbed 2 deprecated TimerInterruptExample

Dependencies:   mbed

main.cpp@0:a6ea53688962, 2010-02-09 (annotated)

Committer:
simon
Date:
Tue Feb 09 11:00:52 2010 +0000
Revision:
0:a6ea53688962

        

        
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// Example to set up an interrupt based on the LPC TIMER0 match register, sford





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#include "mbed.h"





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DigitalOut myled(LED1);





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DigitalOut irqled(LED2);





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void myhandler() {





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    // do something!





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    irqled = !irqled;





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    // clear the TIMER0 interrupt





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    LPC_TIM0->IR = 1;





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}





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int main() {





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    // power up TIMER0 (PCONP[1])





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    LPC_SC->PCONP |= 1 << 1; 





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    // reset and set TIMER0 to timer mode





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    LPC_TIM0->TCR = 0x2;  





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    LPC_TIM0->CTCR = 0x0; 





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    // set no prescaler





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    LPC_TIM0->PR = 0;





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    // calculate period (1 interrupt every second)





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    uint32_t period = SystemCoreClock / 4; 





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    // set match register and enable interrupt    





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	LPC_TIM0->MR0 = period;





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	LPC_TIM0->MCR |= 1 << 0;    // interrupt on match





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	LPC_TIM0->MCR |= 1 << 1;    // reset on match





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    // enable the vector in the interrupt controller





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    NVIC_SetVector(TIMER0_IRQn, (uint32_t)&myhandler);





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    NVIC_EnableIRQ(TIMER0_IRQn);





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    // start the timer





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    LPC_TIM0->TCR = 1;





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    // hang around!   





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    while(1) {





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        myled = 1;





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        wait(0.2);





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        myled = 0;





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        wait(0.2);





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    }





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}