Zilog ZUSBOPTS Uživatelský manuál stáhnout pdf (Strana 212)

100

101

Run-Time Library UM017105-0511

184

Zilog Developer Studio II – ZNEO™

User Manual

void main(void)

{

unsigned short istat;

istat = TDI(); /* Test and Disable Interrupts

/* Do Something */

RI(istat); /* Restore Interrupts */

}

select_port

select_port is a Zilog function that selects the UART. The default is _UART0. The

init_uart function can be used to configure either _UART0 or _UART1 and select the

UART passed as the current one for use. All calls to

putch, getch, and kbhit use the

selected UART. You can also change the selected UART using the

select_port function

without having to reinitialize the UART.

Synopsis

#include <sio.h>

int select_port( int port ) ;

Returns

A zero is returned on success; a nonzero is returned on failure.

Example

#include <stdio.h>

#include <sio.h>

void main(void)

{

init_uart(_UART0,_DEFFREQ,_DEFBAUD);

init_uart(_UART1,_DEFFREQ,_DEFBAUD);

select_port(_UART0);

printf("Hello UART0\n"); // Write to uart0

select_port(_UART1);

printf("Hello UART1\n"); // Write to uart1

}

SET_VECTOR

SET_VECTOR is an intrinsic function provided by the compiler to specify the address of an

interrupt handler for an interrupt vector. Because the interrupt vectors of the ZNEO micro-

controller are usually in ROM, they cannot be modified at run time. The

SET_VECTOR

function works by switching to a special segment and placing the address of the interrupt

handler in the vector table. No executable code is generated for this statement. Calls to the

SET_VECTOR intrinsic function must be placed within a function body. The –reduceopt

compiler option does not affect the

SET_VECTOR function handling.

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