2 * Copyright © 2011 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.
20 uint8_t ao_btm_running;
22 __xdata uint8_t ao_btm_connected;
24 __xdata char ao_btm_buffer[1024];
29 ao_btm_putchar(char c);
32 ao_btm_add_char(char c)
34 if (ao_btm_ptr < sizeof (ao_btm_buffer))
35 ao_btm_buffer[ao_btm_ptr++] = c;
39 ao_btm_log_char(char c, char dir)
41 if (dir != ao_btm_dir) {
49 ao_btm_log_out_char(char c)
51 ao_btm_log_char(c, '>');
55 ao_btm_log_in_char(char c)
57 ao_btm_log_char(c, '<');
60 #define AO_BTM_MAX_REPLY 16
61 __xdata char ao_btm_reply[AO_BTM_MAX_REPLY];
63 extern volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
66 * Read a line of data from the serial port, truncating
67 * it after a few characters.
73 uint8_t ao_btm_reply_len = 0;
78 while ((c = ao_serial_pollchar()) != AO_READ_AGAIN) {
79 ao_btm_log_in_char(c);
80 if (ao_btm_reply_len < sizeof (ao_btm_reply))
81 ao_btm_reply[ao_btm_reply_len++] = c;
82 if (c == '\r' || c == '\n')
85 for (c = 0; c < 10; c++) {
86 ao_delay(AO_MS_TO_TICKS(10));
87 if (!ao_fifo_empty(ao_usart1_rx_fifo))
94 for (c = ao_btm_reply_len; c < sizeof (ao_btm_reply);)
95 ao_btm_reply[c++] = '\0';
96 return ao_btm_reply_len;
100 * Drain the serial port completely
105 while (ao_btm_get_line())
110 * Set the stdio echo for the bluetooth link
113 ao_btm_echo(uint8_t echo)
115 ao_stdios[ao_btm_stdio].echo = echo;
119 * A command line pre-processor to detect connect/disconnect messages
120 * and update the internal state
126 if (ao_cur_stdio != ao_btm_stdio)
129 while (ao_cmd_lex_c != '\n') {
130 if (ao_match_word("CONNECT"))
132 if (ao_match_word("DISCONNECT"))
134 if (ao_match_word("ERROR"))
136 if (ao_match_word("OK"))
145 * Delay between command charaters; the BT module
146 * can't keep up with 57600 baud
150 ao_btm_putchar(char c)
152 ao_btm_log_out_char(c);
153 ao_serial_putchar(c);
158 * Wait for the bluetooth device to return
159 * status from the previously executed command
162 ao_btm_wait_reply(void)
166 if (!strncmp(ao_btm_reply, "OK", 2))
168 if (!strncmp(ao_btm_reply, "ERROR", 5))
170 if (ao_btm_reply[0] == '\0')
176 ao_btm_string(__code char *cmd)
185 ao_btm_cmd(__code char *cmd)
189 return ao_btm_wait_reply();
193 ao_btm_set_name(void)
199 ao_btm_string("ATN=TeleBT-");
202 n = ao_serial_number;
208 return ao_btm_wait_reply();
212 ao_btm_try_speed(uint8_t speed)
214 ao_serial_set_speed(speed);
216 (void) ao_btm_cmd("\rATE0\rATQ0\r");
217 if (ao_btm_cmd("AT\r") == 1)
223 * A thread to initialize the bluetooth device and
224 * hang around to blink the LED when connected
230 * Wait for the bluetooth device to boot
232 ao_delay(AO_SEC_TO_TICKS(3));
235 * The first time we connect, the BTM-180 comes up at 19200 baud.
236 * After that, it will remember and come up at 57600 baud. So, see
237 * if it is already running at 57600 baud, and if that doesn't work
238 * then tell it to switch to 57600 from 19200 baud.
240 while (!ao_btm_try_speed(AO_SERIAL_SPEED_57600)) {
241 ao_delay(AO_SEC_TO_TICKS(1));
242 if (ao_btm_try_speed(AO_SERIAL_SPEED_19200))
243 ao_btm_cmd("ATL4\r");
244 ao_delay(AO_SEC_TO_TICKS(1));
248 ao_btm_cmd("ATE0\r");
250 /* Enable flow control */
251 ao_btm_cmd("ATC1\r");
253 /* Set the reported name to something we can find on the host */
256 /* Turn off status reporting */
257 ao_btm_cmd("ATQ1\r");
259 ao_btm_stdio = ao_add_stdio(ao_serial_pollchar,
266 while (!ao_btm_connected)
267 ao_sleep(&ao_btm_connected);
268 while (ao_btm_connected) {
269 ao_led_for(AO_LED_GREEN, AO_MS_TO_TICKS(20));
270 ao_delay(AO_SEC_TO_TICKS(3));
275 __xdata struct ao_task ao_btm_task;
278 * Dump everything received from the bluetooth device during startup
286 for (i = 0; i < ao_btm_ptr; i++) {
287 c = ao_btm_buffer[i];
288 if (c < ' ' && c != '\n')
289 printf("\\%03o", ((int) c) & 0xff);
291 putchar(ao_btm_buffer[i]);
300 if (ao_cmd_lex_u32 == 57600)
301 ao_serial_set_speed(AO_SERIAL_SPEED_57600);
302 else if (ao_cmd_lex_u32 == 19200)
303 ao_serial_set_speed(AO_SERIAL_SPEED_19200);
305 ao_cmd_status = ao_cmd_syntax_error;
309 ao_btm_check_link() __critical
312 ao_btm_connected = 0;
313 PICTL |= PICTL_P2ICON;
315 ao_btm_connected = 1;
316 PICTL &= ~PICTL_P2ICON;
323 if (P2IFG & (1 << 1)) {
325 ao_wakeup(&ao_btm_connected);
330 __code struct ao_cmds ao_btm_cmds[] = {
331 { ao_btm_dump, "d\0Dump btm buffer." },
332 { ao_btm_speed, "s <19200,57600>\0Set btm serial speed." },
340 ao_serial_set_speed(AO_SERIAL_SPEED_19200);
343 * Configure link status line
346 /* Set P2_1 to input, pull-down */
348 P2INP |= P2INP_MDP2_1_TRISTATE;
350 /* Enable P2 interrupts */
353 PICTL |= PICTL_P2IEN;
355 ao_add_task(&ao_btm_task, ao_btm, "bt");
356 ao_cmd_register(&ao_btm_cmds[0]);