Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 210)

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101

Run-Time Library UM017105-0511

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Zilog Developer Studio II – ZNEO™

User Manual

Before using the getch function, the init_uart() function must be called to initialize

and select the UART. The default UART is _UART0.

init_uart

The init_uart function is a Zilog function that selects the specified UART and initial-

izes it for specified settings and returns the error status.

Synopsis

#include <sio.h>

int init_uart(int port, unsigned long freq, unsigned long

baud);

Returns

Returns 0 if initialization is successful and 1 otherwise.

Example

#include <stdio.h>

#include <sio.h>

void main()

{

init_uart(_UART0,_DEFFREQ,_DEFBAUD);

printf("Hello UART0\n"); // Write to _UART0

}

_DEFFREQ

is automatically set from the IDE using the setting in the Configure Target

dialog box. See Setup

on page 76.

kbhit

kbhit is a Zilog function that determines whether there is receive data available on the

selected UART.

Synopsis

#include <sio.h>

int kbhit(void);

Returns

Returns 1 if there is receive data available on the selected UART; otherwise, it returns 0.

Example

int i;

i=kbhit();

Note:

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