UART interrupt handler

Kira,

I do it like this:

# include "system.h"# include "alt_types.h"# include "sys/alt_irq.h"# include "altera_avalon_uart_regs.h"

void serial_init(unsigned int baud)

{

/* inhibit all UART IRQ sources */

IOWR(UART_1_BASE, 3, 0x00);

/* set Baud rate */

IOWR(UART_1_BASE, 4, baud);

/* flush any characters sitting in the holding register */

IORD(UART_1_BASE, 0);

IORD(UART_1_BASE, 0);

/* reset most of the status register bits */

IOWR(UART_1_BASE, 2, 0x00);

/* install IRQ service routine */

alt_irq_register(UART_1_IRQ, 0, serial_irq_0);

/* enable irq for Rx. */

IOWR(UART_1_BASE, 3, 0x0080);

}

static void serial_irq_0(void* context, alt_u32 id)

{

unsigned int stat, chr;

/* get serial status */

stat = IORD(UART_1_BASE, 2);

/* character Rx */

if (stat & 0x0080) {

chr = IORD(UART_1_BASE, 0);

}

}

Banx.