#include "ao.h"
-uint8_t ao_btm_enable;
-extern volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
+uint8_t ao_btm_running;
+int8_t ao_btm_stdio;
+__xdata uint8_t ao_btm_connected;
void
-ao_btm(void)
+ao_btm_putchar(char c);
+
+#define AO_BTM_MAX_REPLY 16
+__xdata char ao_btm_reply[AO_BTM_MAX_REPLY];
+
+extern volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
+
+/*
+ * Read a line of data from the serial port, truncating
+ * it after a few characters.
+ */
+
+uint8_t
+ao_btm_get_line(void)
{
- char c;
- while (ao_btm_enable) {
- c = ao_serial_pollchar();
- if (c != AO_READ_AGAIN)
- ao_usb_putchar(c);
- else {
- ao_usb_flush();
- ao_sleep(&ao_usart1_rx_fifo);
+ uint8_t ao_btm_reply_len = 0;
+ char c;
+
+ for (;;) {
+
+ while ((c = ao_serial_pollchar()) != AO_READ_AGAIN) {
+ if (ao_btm_reply_len < sizeof (ao_btm_reply))
+ ao_btm_reply[ao_btm_reply_len++] = c;
+ if (c == '\r' || c == '\n')
+ goto done;
+ }
+ for (c = 0; c < 10; c++) {
+ ao_delay(AO_MS_TO_TICKS(10));
+ if (!ao_fifo_empty(ao_usart1_rx_fifo))
+ break;
}
+ if (c == 10)
+ goto done;
}
- ao_exit();
+done:
+ for (c = ao_btm_reply_len; c < sizeof (ao_btm_reply);)
+ ao_btm_reply[c++] = '\0';
+ return ao_btm_reply_len;
}
-__xdata struct ao_task ao_btm_task;
+/*
+ * Drain the serial port completely
+ */
+void
+ao_btm_drain()
+{
+ while (ao_btm_get_line())
+ ;
+}
-static void
-ao_btm_forward(void)
+/*
+ * Set the stdio echo for the bluetooth link
+ */
+void
+ao_btm_echo(uint8_t echo)
{
- char c;
- ao_btm_enable = 1;
- flush();
- ao_add_task(&ao_btm_task, ao_btm, "btm");
+ ao_stdios[ao_btm_stdio].echo = echo;
+}
+
+/*
+ * A command line pre-processor to detect connect/disconnect messages
+ * and update the internal state
+ */
+
+uint8_t
+ao_cmd_filter(void)
+{
+ if (ao_cur_stdio != ao_btm_stdio)
+ return 0;
+ ao_cmd_lex();
+ while (ao_cmd_lex_c != '\n') {
+ if (ao_match_word("CONNECT"))
+ return 1;
+ if (ao_match_word("DISCONNECT"))
+ return 1;
+ if (ao_match_word("ERROR"))
+ return 1;
+ if (ao_match_word("OK"))
+ return 1;
+ ao_cmd_lex();
+ }
+ ao_cmd_status = 0;
+ return 0;
+}
+
+/*
+ * Delay between command charaters; the BT module
+ * can't keep up with 57600 baud
+ */
+
+void
+ao_btm_putchar(char c)
+{
+ ao_serial_putchar(c);
+ ao_delay(1);
+}
+
+/*
+ * Wait for the bluetooth device to return
+ * status from the previously executed command
+ */
+uint8_t
+ao_btm_wait_reply(void)
+{
+ for (;;) {
+ ao_btm_get_line();
+ if (!strncmp(ao_btm_reply, "OK", 2))
+ return 1;
+ if (!strncmp(ao_btm_reply, "ERROR", 5))
+ return -1;
+ if (ao_btm_reply[0] == '\0')
+ return 0;
+ }
+}
+
+void
+ao_btm_string(__code char *cmd)
+{
+ char c;
+
+ while (c = *cmd++)
+ ao_btm_putchar(c);
+}
+
+uint8_t
+ao_btm_cmd(__code char *cmd)
+{
+ ao_btm_drain();
+ ao_btm_string(cmd);
+ return ao_btm_wait_reply();
+}
+
+uint8_t
+ao_btm_set_name(void)
+{
+ char sn[8];
+ char *s = sn + 8;
+ char c;
+ int n;
+ ao_btm_string("ATN=TeleBT-");
+ *--s = '\0';
+ *--s = '\r';
+ n = ao_serial_number;
+ do {
+ *--s = '0' + n % 10;
+ } while (n /= 10);
+ while ((c = *s++))
+ ao_btm_putchar(c);
+ return ao_btm_wait_reply();
+}
+
+uint8_t
+ao_btm_try_speed(uint8_t speed)
+{
+ ao_serial_set_speed(speed);
+ ao_btm_drain();
+ (void) ao_btm_cmd("\rATE0\rATQ0\r");
+ if (ao_btm_cmd("AT\r") == 1)
+ return 1;
+ return 0;
+}
- while ((c = ao_usb_getchar()) != '~') {
- if (c == '\n') c = '\r';
- ao_serial_putchar(c);
+/*
+ * A thread to initialize the bluetooth device and
+ * hang around to blink the LED when connected
+ */
+void
+ao_btm(void)
+{
+ /*
+ * Wait for the bluetooth device to boot
+ */
+ ao_delay(AO_SEC_TO_TICKS(3));
+
+ /*
+ * The first time we connect, the BTM-180 comes up at 19200 baud.
+ * After that, it will remember and come up at 57600 baud. So, see
+ * if it is already running at 57600 baud, and if that doesn't work
+ * then tell it to switch to 57600 from 19200 baud.
+ */
+ while (!ao_btm_try_speed(AO_SERIAL_SPEED_57600)) {
+ ao_delay(AO_SEC_TO_TICKS(1));
+ if (ao_btm_try_speed(AO_SERIAL_SPEED_19200))
+ ao_btm_cmd("ATL4\r");
+ ao_delay(AO_SEC_TO_TICKS(1));
}
- ao_btm_enable = 0;
- while (ao_btm_task.wchan) {
- ao_wakeup(&ao_usart1_rx_fifo);
- ao_delay(AO_MS_TO_TICKS(10));
+
+ /* Disable echo */
+ ao_btm_cmd("ATE0\r");
+
+ /* Enable flow control */
+ ao_btm_cmd("ATC1\r");
+
+ /* Set the reported name to something we can find on the host */
+ ao_btm_set_name();
+
+ /* Turn off status reporting */
+ ao_btm_cmd("ATQ1\r");
+
+ ao_btm_stdio = ao_add_stdio(ao_serial_pollchar,
+ ao_serial_putchar,
+ NULL);
+ ao_btm_echo(0);
+
+ ao_btm_running = 1;
+ for (;;) {
+ while (!ao_btm_connected)
+ ao_sleep(&ao_btm_connected);
+ while (ao_btm_connected) {
+ ao_led_for(AO_LED_GREEN, AO_MS_TO_TICKS(20));
+ ao_delay(AO_SEC_TO_TICKS(3));
+ }
}
}
-__code struct ao_cmds ao_btm_cmds[] = {
- { ao_btm_forward, "B <data>\0BTM serial link." },
- { 0, NULL },
-};
+__xdata struct ao_task ao_btm_task;
+void
+ao_btm_check_link() __critical
+{
+ if (P2_1) {
+ ao_btm_connected = 0;
+ PICTL |= PICTL_P2ICON;
+ } else {
+ ao_btm_connected = 1;
+ PICTL &= ~PICTL_P2ICON;
+ }
+}
+
+void
+ao_btm_isr(void)
+{
+ if (P2IFG & (1 << 1)) {
+ ao_btm_check_link();
+ ao_wakeup(&ao_btm_connected);
+ }
+ P2IFG = 0;
+}
void
ao_btm_init (void)
{
ao_serial_init();
ao_serial_set_speed(AO_SERIAL_SPEED_19200);
- ao_cmd_register(&ao_btm_cmds[0]);
+
+ /*
+ * Configure link status line
+ */
+
+ /* Set P2_1 to input, pull-down */
+ P2DIR &= ~(1 << 1);
+ P2INP |= P2INP_MDP2_1_TRISTATE;
+
+ /* Enable P2 interrupts */
+ IEN2 |= IEN2_P2IE;
+ ao_btm_check_link();
+ PICTL |= PICTL_P2IEN;
+
+ ao_add_task(&ao_btm_task, ao_btm, "bt");
}
projects / fw / altos / blobdiff