Vector VEC256 Specifiche Scaricare il pdf (Pagina 336)

336 www.xilinx.com Embedded System Tools Guide (EDK 6.2i)

1-800-255-7778 UG111 (v1.4) January 30, 2004

Chapter 23: Interrupt Management

/* Set timer with new value of timer_count */

XTmrCtr_mSetLoadReg(XPAR_MYTIMER_BASEADDR, 0, (timer_count*tim

er_count+1) * 1000000);

}

/* timer interrupt service routine */

void timer_int_handler(void * baseaddr_p) {

unsigned int csr;

unsigned int gpio_data;

/* Read timer 0 CSR to see if it raised the interrupt */

csr = XTmrCtr_mGetControlStatusReg(XPAR_MYTIMER_BASEADDR, 0);

if (csr & XTC_CSR_INT_OCCURED_MASK) {

/* Increment the count */

if ((count <<= 1) > 8) {

count = 1;

}

/* Write value to gpio. 0 means light up, hence count is negated */

gpio_data = ~count;

XGpio_mSetDataReg(XPAR_MYGPIO_BASEADDR, gpio_data);

/* Clear the timer interrupt */

XTmrCtr_mSetControlStatusReg(XPAR_MYTIMER_BASEADDR, 0, csr);

}

void

main() {

unsigned int gpio_data;

/* Enable microblaze interrupts */

microblaze_enable_interrupts();

/* Connect uart interrupt handler that will be called when an interrupt

* for the uart occurs

XIntc_RegisterHandler(XPAR_MYINTC_BASEADDR,

XPAR_MYINTC_MYUART_INTERRUPT_INTR,

(XInterruptHandler)uart_int_handler,

(void *)XPAR_MYUART_BASEADDR);

/* Start the interrupt controller */

XIntc_mMasterEnable(XPAR_MYINTC_BASEADDR);

/* Set the gpio as output on high 3 bits (LEDs)*/

XGpio_mSetDataDirection(XPAR_MYGPIO_BASEADDR, 0x00);

/* set the number of cycles the timer counts before interrupting */

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Vector VEC256 Specifiche Pagina 336