/* uart.host.c */ /* avr.uart - UART AVR module. {{{ * * Copyright (C) 2005 Nicolas Schodet * * Robot APB Team/Efrei 2006. * Web: http://assos.efrei.fr/robot/ * Email: robot AT efrei DOT fr * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * }}} */ #define _GNU_SOURCE #include "uart.h" #include "uart_common.h" #if AC_UART (PORT) != -1 #include #include #include #include #include #include /* Pseudo terminal file descriptor. */ static int uart_pt_fd; /** Initialise uart. */ void uart_init (void) { /* Open and unlock pt. */ uart_pt_fd = getpt (); if (uart_pt_fd == -1) assert_perror (errno); if (grantpt (uart_pt_fd) == -1 || unlockpt (uart_pt_fd) == -1) assert_perror (errno); /* Display its name. */ printf ("uart%d: %s\n", UART_N, ptsname (uart_pt_fd)); } /** Read a char. */ uint8_t uart_getc (void) { uint8_t c; int n; n = read (uart_pt_fd, &c, 1); if (n == -1) assert_perror (errno); /* This is quite unusual... */ if (n == 0) return 0; return c; } /** Write a char. */ void uart_putc (uint8_t c) { int n; write (uart_pt_fd, &c, 1); } /** Retrieve availlable chars. */ uint8_t uart_poll (void) { fd_set fds; struct timeval tv; int r; /* Use select to poll. */ FD_ZERO (&fds); FD_SET (uart_pt_fd, &fds); tv.tv_sec = 0; tv.tv_usec = 0; r = select (FD_SETSIZE, &fds, 0, 0, &tv); /* Check result. */ if (r == -1) assert_perror (errno); return r; } #endif /* AC_UART (PORT) != -1 */