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   1 /*
   2  * Copyright © 2011 Keith Packard <keithp@keithp.com>
   3  *
   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.
   7  *
   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.
  12  *
  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.
  16  */
  17
  18 #include "ao.h"
  19
  20 uint8_t                 ao_btm_running;
  21 int8_t                  ao_btm_stdio;
  22 __xdata uint8_t         ao_btm_connected;
  23 uint8_t                 ao_btm_chat;
  24
  25 __xdata char            ao_btm_buffer[1024];
  26 int                     ao_btm_ptr;
  27 char                    ao_btm_dir;
  28
  29 void
  30 ao_btm_putchar(char c);
  31
  32 static void
  33 ao_btm_add_char(char c)
  34 {
  35         if (ao_btm_ptr < sizeof (ao_btm_buffer))
  36                 ao_btm_buffer[ao_btm_ptr++] = c;
  37 }
  38
  39 static void
  40 ao_btm_log_char(char c, char dir)
  41 {
  42         if (dir != ao_btm_dir) {
  43                 ao_btm_add_char(dir);
  44                 ao_btm_dir = dir;
  45         }
  46         ao_btm_add_char(c);
  47 }
  48
  49 static void
  50 ao_btm_log_out_char(char c)
  51 {
  52         ao_btm_log_char(c, '>');
  53 }
  54
  55 static void
  56 ao_btm_log_in_char(char c)
  57 {
  58         ao_btm_log_char(c, '<');
  59 }
  60
  61 #define AO_BTM_MAX_REPLY        16
  62 __xdata char            ao_btm_reply[AO_BTM_MAX_REPLY];
  63
  64 extern volatile __xdata struct ao_fifo  ao_usart1_rx_fifo;
  65
  66 /*
  67  * Read a line of data from the serial port, truncating
  68  * it after a few characters.
  69  */
  70
  71 uint8_t
  72 ao_btm_get_line(void)
  73 {
  74         uint8_t ao_btm_reply_len = 0;
  75         char c;
  76
  77         for (;;) {
  78
  79                 while ((c = ao_serial_pollchar()) != AO_READ_AGAIN) {
  80                         ao_btm_log_in_char(c);
  81                         if (ao_btm_reply_len < sizeof (ao_btm_reply))
  82                                 ao_btm_reply[ao_btm_reply_len++] = c;
  83                         if (c == '\r' || c == '\n')
  84                                 goto done;
  85                 }
  86                 for (c = 0; c < 10; c++) {
  87                         ao_delay(AO_MS_TO_TICKS(10));
  88                         if (!ao_fifo_empty(ao_usart1_rx_fifo))
  89                                 break;
  90                 }
  91                 if (c == 10)
  92                         goto done;
  93         }
  94 done:
  95         for (c = ao_btm_reply_len; c < sizeof (ao_btm_reply);)
  96                 ao_btm_reply[c++] = '\0';
  97         return ao_btm_reply_len;
  98 }
  99
 100 /*
 101  * Drain the serial port completely
 102  */
 103 void
 104 ao_btm_drain()
 105 {
 106         while (ao_btm_get_line())
 107                 ;
 108 }
 109
 110 /*
 111  * Set the stdio echo for the bluetooth link
 112  */
 113 void
 114 ao_btm_echo(uint8_t echo)
 115 {
 116         ao_stdios[ao_btm_stdio].echo = echo;
 117 }
 118
 119 /*
 120  * A command line pre-processor to detect connect/disconnect messages
 121  * and update the internal state
 122  */
 123
 124 uint8_t
 125 ao_cmd_filter(void)
 126 {
 127         if (ao_cur_stdio != ao_btm_stdio)
 128                 return 0;
 129         ao_cmd_lex();
 130         while (ao_cmd_lex_c != '\n') {
 131                 if (ao_match_word("CONNECT"))
 132                         return 1;
 133                 if (ao_match_word("DISCONNECT"))
 134                         return 1;
 135                 if (ao_match_word("ERROR"))
 136                         return 1;
 137                 if (ao_match_word("OK"))
 138                         return 1;
 139                 ao_cmd_lex();
 140         }
 141         ao_cmd_status = 0;
 142         return 0;
 143 }
 144
 145 /*
 146  * Delay between command charaters; the BT module
 147  * can't keep up with 57600 baud
 148  */
 149
 150 void
 151 ao_btm_putchar(char c)
 152 {
 153         ao_btm_log_out_char(c);
 154         ao_serial_putchar(c);
 155         ao_delay(1);
 156 }
 157
 158 /*
 159  * Wait for the bluetooth device to return
 160  * status from the previously executed command
 161  */
 162 uint8_t
 163 ao_btm_wait_reply(void)
 164 {
 165         for (;;) {
 166                 ao_btm_get_line();
 167                 if (!strncmp(ao_btm_reply, "OK", 2))
 168                         return 1;
 169                 if (!strncmp(ao_btm_reply, "ERROR", 5))
 170                         return -1;
 171                 if (ao_btm_reply[0] == '\0')
 172                         return 0;
 173         }
 174 }
 175
 176 void
 177 ao_btm_string(__code char *cmd)
 178 {
 179         char    c;
 180
 181         while (c = *cmd++)
 182                 ao_btm_putchar(c);
 183 }
 184
 185 uint8_t
 186 ao_btm_cmd(__code char *cmd)
 187 {
 188         ao_btm_drain();
 189         ao_btm_string(cmd);
 190         return ao_btm_wait_reply();
 191 }
 192
 193 uint8_t
 194 ao_btm_set_name(void)
 195 {
 196         char    sn[8];
 197         char    *s = sn + 8;
 198         char    c;
 199         int     n;
 200         ao_btm_string("ATN=TeleBT-");
 201         *--s = '\0';
 202         *--s = '\r';
 203         n = ao_serial_number;
 204         do {
 205                 *--s = '0' + n % 10;
 206         } while (n /= 10);
 207         while ((c = *s++))
 208                 ao_btm_putchar(c);
 209         return ao_btm_wait_reply();
 210 }
 211
 212 uint8_t
 213 ao_btm_try_speed(uint8_t speed)
 214 {
 215         ao_serial_set_speed(speed);
 216         ao_btm_drain();
 217         (void) ao_btm_cmd("\rATE0\rATQ0\r");
 218         if (ao_btm_cmd("AT\r") == 1)
 219                 return 1;
 220         return 0;
 221 }
 222
 223 /*
 224  * A thread to initialize the bluetooth device and
 225  * hang around to blink the LED when connected
 226  */
 227 void
 228 ao_btm(void)
 229 {
 230         /*
 231          * Wait for the bluetooth device to boot
 232          */
 233         ao_delay(AO_SEC_TO_TICKS(3));
 234
 235         /*
 236          * The first time we connect, the BTM-180 comes up at 19200 baud.
 237          * After that, it will remember and come up at 57600 baud. So, see
 238          * if it is already running at 57600 baud, and if that doesn't work
 239          * then tell it to switch to 57600 from 19200 baud.
 240          */
 241         while (!ao_btm_try_speed(AO_SERIAL_SPEED_57600)) {
 242                 ao_delay(AO_SEC_TO_TICKS(1));
 243                 if (ao_btm_try_speed(AO_SERIAL_SPEED_19200))
 244                         ao_btm_cmd("ATL4\r");
 245                 ao_delay(AO_SEC_TO_TICKS(1));
 246         }
 247
 248         /* Disable echo */
 249         ao_btm_cmd("ATE0\r");
 250
 251         /* Enable flow control */
 252         ao_btm_cmd("ATC1\r");
 253
 254         /* Set the reported name to something we can find on the host */
 255         ao_btm_set_name();
 256
 257         /* Turn off status reporting */
 258         ao_btm_cmd("ATQ1\r");
 259
 260         ao_btm_stdio = ao_add_stdio(ao_serial_pollchar,
 261                                     ao_serial_putchar,
 262                                     NULL);
 263         ao_btm_echo(0);
 264
 265         ao_btm_running = 1;
 266         for (;;) {
 267                 while (!ao_btm_connected && !ao_btm_chat)
 268                         ao_sleep(&ao_btm_connected);
 269                 if (ao_btm_chat) {
 270                         ao_btm_running = 0;
 271                         while (ao_btm_chat) {
 272                                 char    c;
 273                                 c = ao_serial_pollchar();
 274                                 if (c != AO_READ_AGAIN) {
 275                                         ao_btm_log_in_char(c);
 276                                         ao_usb_putchar(c);
 277                                 } else {
 278                                         ao_usb_flush();
 279                                         ao_sleep(&ao_usart1_rx_fifo);
 280                                 }
 281                         }
 282                         ao_btm_running = 1;
 283                 }
 284                 while (ao_btm_connected) {
 285                         ao_led_for(AO_LED_GREEN, AO_MS_TO_TICKS(20));
 286                         ao_delay(AO_SEC_TO_TICKS(3));
 287                 }
 288         }
 289 }
 290
 291 __xdata struct ao_task ao_btm_task;
 292
 293 /*
 294  * Connect directly to the bluetooth device, mostly
 295  * useful for testing
 296  */
 297 static void
 298 ao_btm_forward(void)
 299 {
 300         char c;
 301
 302         ao_btm_chat = 1;
 303         ao_wakeup(&ao_btm_connected);
 304         ao_usb_flush();
 305         while ((c = ao_usb_getchar()) != '~') {
 306                 if (c == '\n') c = '\r';
 307                 ao_btm_putchar(c);
 308         }
 309         ao_btm_chat = 0;
 310         while (!ao_btm_running) {
 311                 ao_wakeup(&ao_usart1_rx_fifo);
 312                 ao_delay(AO_MS_TO_TICKS(10));
 313         }
 314 }
 315
 316 /*
 317  * Dump everything received from the bluetooth device during startup
 318  */
 319 static void
 320 ao_btm_dump(void)
 321 {
 322         int i;
 323         char c;
 324
 325         for (i = 0; i < ao_btm_ptr; i++) {
 326                 c = ao_btm_buffer[i];
 327                 if (c < ' ' && c != '\n')
 328                         printf("\\%03o", ((int) c) & 0xff);
 329                 else
 330                         putchar(ao_btm_buffer[i]);
 331         }
 332         putchar('\n');
 333 }
 334
 335 static void
 336 ao_btm_speed(void)
 337 {
 338         ao_cmd_decimal();
 339         if (ao_cmd_lex_u32 == 57600)
 340                 ao_serial_set_speed(AO_SERIAL_SPEED_57600);
 341         else if (ao_cmd_lex_u32 == 19200)
 342                 ao_serial_set_speed(AO_SERIAL_SPEED_19200);
 343         else
 344                 ao_cmd_status = ao_cmd_syntax_error;
 345 }
 346
 347 void
 348 ao_btm_check_link() __critical
 349 {
 350         if (P2_1) {
 351                 ao_btm_connected = 0;
 352                 PICTL |= PICTL_P2ICON;
 353         } else {
 354                 ao_btm_connected = 1;
 355                 PICTL &= ~PICTL_P2ICON;
 356         }
 357 }
 358
 359 void
 360 ao_btm_isr(void)
 361 {
 362         if (P2IFG & (1 << 1)) {
 363                 ao_btm_check_link();
 364                 ao_wakeup(&ao_btm_connected);
 365         }
 366         P2IFG = 0;
 367 }
 368
 369 __code struct ao_cmds ao_btm_cmds[] = {
 370         { ao_btm_forward,       "B\0BTM serial link." },
 371         { ao_btm_dump,          "d\0Dump btm buffer." },
 372         { ao_btm_speed,         "s <19200,57600>\0Set btm serial speed." },
 373         { 0, NULL },
 374 };
 375
 376 void
 377 ao_btm_init (void)
 378 {
 379         ao_serial_init();
 380         ao_serial_set_speed(AO_SERIAL_SPEED_19200);
 381
 382         /*
 383          * Configure link status line
 384          */
 385
 386         /* Set P2_1 to input, pull-down */
 387         P2DIR &= ~(1 << 1);
 388         P2INP |= P2INP_MDP2_1_TRISTATE;
 389
 390         /* Enable P2 interrupts */
 391         IEN2 |= IEN2_P2IE;
 392         ao_btm_check_link();
 393         PICTL |= PICTL_P2IEN;
 394
 395         ao_add_task(&ao_btm_task, ao_btm, "bt");
 396         ao_cmd_register(&ao_btm_cmds[0]);
 397 }