reflow-oven-control-sw/stm-firmware/syscalls.c

/* Reflow Oven Controller
 *
 * Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
 *
 * This file is part of the Reflow Oven Controller Project.
 *
 * The reflow oven controller is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the reflow oven controller project.
 * If not, see <http://www.gnu.org/licenses/>.
 */

#include <stm-periph/uart.h>
#include <sys/types.h>
#include <errno.h>
#include <stddef.h>


char* _sbrk(int incr)
{
	extern char heap_low;    // Defined by the linker
	extern char heap_top;
	static char *heap_end;
	char *prev_heap_end;

	if (heap_end == 0) {
		heap_end = &heap_low;
	}

	prev_heap_end = heap_end;


	if (heap_end + incr > &heap_top) {
		errno = ENOMEM;
		return (char *)-1;
	}

	heap_end += incr;

	return (char *) prev_heap_end;
}

int _isatty(int fd)
{
	(void)fd;

	return 1;
}

int _close(int fd)
{
	(void)fd;

	return 0;
}

int _open(int fd)
{
	(void)fd;

	return 0;
}

int _fstat(void)
{
	return 0;
}

int _lseek(void)
{
	return 0;
}

int _read(void)
{
	return 0;
}

int _write(int fd, const void *buf, int count)
{
	if (fd == 1)
		uart_send_array_with_dma((char*)buf, count);
	return count;
}