Zilog ZUSBOPTS - Manual (Page 212)

Run-Time Library UM017105-0511
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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
int select_port( int port ) ;
Returns
A zero is returned on success; a nonzero is returned on failure.
Example
#include
#include
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.