uart_write()

向保存的指定UART传送数据

Description

int uart_write(int $uart_id, string $wbuf [, int $wlen = MAX_STRING_LEN])

Parameters

$uart_id: 接收数据的UART账号
$wbuf: 保存传送数据的变量
$wlen: 传送数据长度

Return Value

成功时传送的数据长度（字节数），失败时 0

Example

<?php
include "/lib/sd_340.php";
$wbuf = "abcde";
uart_setup(0, 9600);           // Configuring UART0 to 9600 bps
$slen = uart_write(0, $wbuf);  // Sending $wbuf data to UART0
usleep(500000);
echo "$slen bytes has been sent\r\n";
?>

See also

uart_txfree() >