altos-avr: Initial OS port to AVR

This is working with output to the serial line

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 253 insertions, 0 deletions

diff --git a/src-avr/ao_btm.c b/src-avr/ao_btm.c
new file mode 100644
index 00000000..db0ff6b0
--- /dev/null
+++ b/src-avr/ao_btm.c
@@ -0,0 +1,253 @@
+/*
+ * 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");
+}