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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
int8_t ao_btm_stdio;
__xdata uint8_t ao_btm_connected;
#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)
{
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;
}
done:
for (c = ao_btm_reply_len; c < sizeof (ao_btm_reply);)
ao_btm_reply[c++] = '\0';
return ao_btm_reply_len;
}
/*
* Drain the serial port completely
*/
void
ao_btm_drain()
{
while (ao_btm_get_line())
;
}
/*
* Set the stdio echo for the bluetooth link
*/
void
ao_btm_echo(uint8_t echo)
{
ao_stdios[ao_btm_stdio].echo = echo;
}
/*
* 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;
}
/*
* 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));
}
/* 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);
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));
}
}
}
__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);
/*
* 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");
}
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