2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 #define AO_ASYNC_BAUD 38400l
22 #define AO_ASYNC_DELAY (uint8_t) (1000000l / AO_ASYNC_BAUD)
24 #define LED_PORT PORTB
29 LED_PORT |= (1 << AO_LED_SERIAL);
35 LED_PORT &= ~(1 << AO_LED_SERIAL);
39 ao_async_byte(uint8_t byte)
45 w = (0x000 << 0) | (byte << 1) | (0x001 << 9);
47 ao_arch_block_interrupts();
48 for (b = 0; b < 10; b++) {
49 uint8_t v = LED_PORT & ~(1 << AO_LED_SERIAL);
50 v |= (w & 1) << AO_LED_SERIAL;
54 /* Carefully timed to hit around 9600 baud */
70 ao_arch_release_interrupts();