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 ao_beep_for(AO_BEEP_MID, AO_MS_TO_TICKS(200));
174 * The first time we connect, the BTM-180 comes up at 19200 baud.
175 * After that, it will remember and come up at 57600 baud. So, see
176 * if it is already running at 57600 baud, and if that doesn't work
177 * then tell it to switch to 57600 from 19200 baud.
179 while (!ao_btm_try_speed(AO_SERIAL_SPEED_57600)) {
180 ao_delay(AO_SEC_TO_TICKS(1));
181 if (ao_btm_try_speed(AO_SERIAL_SPEED_19200))
182 ao_btm_cmd("ATL4\r");
183 ao_delay(AO_SEC_TO_TICKS(1));
187 ao_btm_cmd("ATE0\r");
189 /* Enable flow control */
190 ao_btm_cmd("ATC1\r");
192 /* Set the reported name to something we can find on the host */
195 /* Turn off status reporting */
196 ao_btm_cmd("ATQ1\r");
198 ao_btm_stdio = ao_add_stdio(ao_serial_pollchar,
204 while (!ao_btm_connected)
205 ao_sleep(&ao_btm_connected);
206 while (ao_btm_connected) {
207 ao_led_for(AO_LED_GREEN, AO_MS_TO_TICKS(20));
208 ao_delay(AO_SEC_TO_TICKS(3));
213 __xdata struct ao_task ao_btm_task;
216 #define BT_PICTL_ICON PICTL_P2ICON
217 #define BT_PIFG P2IFG
218 #define BT_PDIR P2DIR
219 #define BT_PINP P2INP
220 #define BT_IEN2_PIE IEN2_P2IE
223 #define BT_PICTL_ICON PICTL_P1ICON
224 #define BT_PIFG P1IFG
225 #define BT_PDIR P1DIR
226 #define BT_PINP P1INP
227 #define BT_IEN2_PIE IEN2_P1IE
231 ao_btm_check_link() __critical
233 /* Check the pin and configure the interrupt detector to wait for the
234 * pin to flip the other way
237 ao_btm_connected = 0;
238 PICTL |= BT_PICTL_ICON;
240 ao_btm_connected = 1;
241 PICTL &= ~BT_PICTL_ICON;
254 if (BT_PIFG & (1 << BT_LINK_PIN_INDEX)) {
256 ao_wakeup(&ao_btm_connected);
265 ao_serial_set_speed(AO_SERIAL_SPEED_19200);
269 * Configure ser reset line
277 * Configure link status line
280 /* Set pin to input */
281 BT_PDIR &= ~(1 << BT_LINK_PIN_INDEX);
283 /* Set pin to tri-state */
284 BT_PINP |= (1 << BT_LINK_PIN_INDEX);
286 /* Enable interrupts */
289 /* Check current pin state */
293 /* Eable the pin interrupt */
294 PICTL |= PICTL_P2IEN;
297 /* Enable pin interrupt */
298 P1IEN |= (1 << BT_LINK_PIN_INDEX);
301 ao_add_task(&ao_btm_task, ao_btm, "bt");