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// Example code for interacting with serial_irq.c
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <fcntl.h> // fcntl
#include <unistd.h> // STDIN_FILENO
#include "board/serial_irq.h" // serial_get_tx_byte
#include "sched.h" // DECL_INIT
void
serial_init(void)
{
// Make stdin/stdout non-blocking
fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) | O_NONBLOCK);
fcntl(STDOUT_FILENO, F_SETFL, fcntl(STDOUT_FILENO, F_GETFL, 0) | O_NONBLOCK);
}
DECL_INIT(serial_init);
static void
do_uart(void)
{
for (;;) {
uint8_t data;
int ret = serial_get_tx_byte(&data);
if (ret)
break;
else
write(STDOUT_FILENO, &data, sizeof(data));
// XXX - Normally the code would check if input data is
// available and call serial_rx_byte()
}
}
void
serial_enable_tx_irq(void)
{
// Normally this would enable the hardware irq, but we just call
// do_uart() directly in this demo code.
do_uart();
}
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