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.
21 __xdata uint8_t ao_btm_connected;
23 #define AO_BTM_MAX_REPLY 16
24 __xdata char ao_btm_reply[AO_BTM_MAX_REPLY];
26 extern volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
29 * Read a line of data from the serial port, truncating
30 * it after a few characters.
36 uint8_t ao_btm_reply_len = 0;
41 while ((c = ao_serial_pollchar()) != AO_READ_AGAIN) {
42 if (ao_btm_reply_len < sizeof (ao_btm_reply))
43 ao_btm_reply[ao_btm_reply_len++] = c;
44 if (c == '\r' || c == '\n')
47 for (c = 0; c < 10; c++) {
48 ao_delay(AO_MS_TO_TICKS(10));
49 if (!ao_fifo_empty(ao_usart1_rx_fifo))
56 for (c = ao_btm_reply_len; c < sizeof (ao_btm_reply);)
57 ao_btm_reply[c++] = '\0';
58 return ao_btm_reply_len;
62 * Drain the serial port completely
67 while (ao_btm_get_line())
72 * Set the stdio echo for the bluetooth link
75 ao_btm_echo(uint8_t echo)
77 ao_stdios[ao_btm_stdio].echo = echo;
81 * Delay between command charaters; the BT module
82 * can't keep up with 57600 baud
86 ao_btm_putchar(char c)
93 * Wait for the bluetooth device to return
94 * status from the previously executed command
97 ao_btm_wait_reply(void)
101 if (!strncmp(ao_btm_reply, "OK", 2))
103 if (!strncmp(ao_btm_reply, "ERROR", 5))
105 if (ao_btm_reply[0] == '\0')
111 ao_btm_string(__code char *cmd)
120 ao_btm_cmd(__code char *cmd)
124 return ao_btm_wait_reply();
128 ao_btm_set_name(void)
134 ao_btm_string("ATN=TeleBT-");
137 n = ao_serial_number;
143 return ao_btm_wait_reply();
147 ao_btm_try_speed(uint8_t speed)
149 ao_serial_set_speed(speed);
151 (void) ao_btm_cmd("\rATE0\rATQ0\r");
152 if (ao_btm_cmd("AT\r") == 1)
158 * A thread to initialize the bluetooth device and
159 * hang around to blink the LED when connected
165 * Wait for the bluetooth device to boot
167 ao_delay(AO_SEC_TO_TICKS(3));
170 * The first time we connect, the BTM-180 comes up at 19200 baud.
171 * After that, it will remember and come up at 57600 baud. So, see
172 * if it is already running at 57600 baud, and if that doesn't work
173 * then tell it to switch to 57600 from 19200 baud.
175 while (!ao_btm_try_speed(AO_SERIAL_SPEED_57600)) {
176 ao_delay(AO_SEC_TO_TICKS(1));
177 if (ao_btm_try_speed(AO_SERIAL_SPEED_19200))
178 ao_btm_cmd("ATL4\r");
179 ao_delay(AO_SEC_TO_TICKS(1));
183 ao_btm_cmd("ATE0\r");
185 /* Enable flow control */
186 ao_btm_cmd("ATC1\r");
188 /* Set the reported name to something we can find on the host */
191 /* Turn off status reporting */
192 ao_btm_cmd("ATQ1\r");
194 ao_btm_stdio = ao_add_stdio(ao_serial_pollchar,
200 while (!ao_btm_connected)
201 ao_sleep(&ao_btm_connected);
202 while (ao_btm_connected) {
203 ao_led_for(AO_LED_GREEN, AO_MS_TO_TICKS(20));
204 ao_delay(AO_SEC_TO_TICKS(3));
209 __xdata struct ao_task ao_btm_task;
212 ao_btm_check_link() __critical
215 ao_btm_connected = 0;
216 PICTL |= PICTL_P2ICON;
218 ao_btm_connected = 1;
219 PICTL &= ~PICTL_P2ICON;
226 if (P2IFG & (1 << 1)) {
228 ao_wakeup(&ao_btm_connected);
237 ao_serial_set_speed(AO_SERIAL_SPEED_19200);
240 * Configure link status line
243 /* Set P2_1 to input, pull-down */
245 P2INP |= P2INP_MDP2_1_TRISTATE;
247 /* Enable P2 interrupts */
250 PICTL |= PICTL_P2IEN;
252 ao_add_task(&ao_btm_task, ao_btm, "bt");