--- /dev/null
+/*
+ * Copyright © 2017 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <ao.h>
+#include <ao_rn4678.h>
+#include <ao_exti.h>
+#include <stdarg.h>
+
+static uint8_t ao_rn_connected;
+
+#define AO_RN_DEBUG 0
+
+#if AO_RN_DEBUG
+static void ao_rn_dbg(char *format, ...) {
+ va_list a;
+ uint32_t irq = ao_arch_irqsave();
+ ao_arch_release_interrupts();
+ va_start(a, format);
+ vprintf(format, a);
+ va_end(a);
+ flush();
+ ao_arch_irqrestore(irq);
+}
+
+static char ao_rn_dir;
+
+static void
+ao_rn_log_char(char c, char dir)
+{
+ if (dir != ao_rn_dir) {
+ putchar(dir);
+ ao_rn_dir = dir;
+ }
+ switch (c) {
+ case '\r':
+ putchar('\\'); putchar('r');
+ break;
+ case '\n':
+ putchar('\\'); putchar('n');
+ break;
+ default:
+ putchar(c);
+ }
+ flush();
+}
+
+static void
+ao_rn_log_out_char(char c)
+{
+ ao_rn_log_char(c, '}');
+}
+
+static void
+ao_rn_log_in_char(char c)
+{
+ ao_rn_log_char(c, '{');
+}
+
+static inline void
+ao_rn_putchar(char c)
+{
+ ao_rn_log_out_char(c);
+ ao_serial_rn_putchar(c);
+}
+
+static inline int
+_ao_rn_pollchar(void)
+{
+ int c = _ao_serial_rn_pollchar();
+
+ if (c != AO_READ_AGAIN) {
+ ao_arch_release_interrupts();
+ ao_rn_log_in_char((char) c);
+ ao_arch_block_interrupts();
+ }
+ return c;
+}
+#else
+#define ao_rn_dbg(fmt, ...)
+#define ao_rn_putchar(c) ao_serial_rn_putchar(c)
+#define _ao_rn_pollchar() _ao_serial_rn_pollchar()
+#endif
+
+/* For stdio, this skips all status messages *sigh* */
+
+#define STATUS_CHAR '%'
+
+static const char *status_strings[] = {
+ "RFCOMM_CLOSE",
+ "RFCOMM_OPEN",
+ "CONNECT",
+ "DISCONN",
+ "BONDED",
+};
+
+#define NUM_STATUS_STRING (sizeof status_strings/sizeof status_strings[0])
+
+int
+_ao_wrap_rn_pollchar(void)
+{
+ static char buffer[64];
+ static int buf_cnt, buf_ptr;
+ static int draining;
+ int c = AO_READ_AGAIN;
+ unsigned i;
+ int done = 0;
+
+ while (!done && !draining) {
+ c = _ao_serial_rn_pollchar();
+
+ if (c == AO_READ_AGAIN)
+ return AO_READ_AGAIN;
+
+ if (buf_cnt) {
+ /* buffering chars */
+
+ if (c == STATUS_CHAR) {
+ /* End of status string, drop it and carry on */
+ buffer[buf_cnt] = '\0';
+ ao_rn_dbg("discard %s\n", buffer);
+ buf_cnt = 0;
+ } else if (buf_cnt == sizeof(buffer)) {
+ /* If we filled the buffer, just give up */
+ draining = 1;
+ } else {
+ buffer[buf_cnt++] = c;
+ for (i = 0; i < NUM_STATUS_STRING; i++) {
+ int cmp = strlen(status_strings[i]);
+ if (cmp >= buf_cnt)
+ cmp = buf_cnt-1;
+ if (memcmp(buffer+1, status_strings[i], cmp) == 0)
+ break;
+ }
+ if (i == NUM_STATUS_STRING)
+ draining = 1;
+ }
+ } else if (c == STATUS_CHAR) {
+ buffer[0] = c;
+ buf_cnt = 1;
+ buf_ptr = 0;
+ } else
+ done = 1;
+ }
+ if (draining) {
+ c = buffer[buf_ptr++] & 0xff;
+ if (buf_ptr == buf_cnt) {
+ buf_ptr = buf_cnt = 0;
+ draining = 0;
+ }
+ }
+#if AO_RN_DEBUG
+ ao_arch_release_interrupts();
+ ao_usb_putchar(c); ao_usb_flush();
+ ao_arch_block_interrupts();
+#endif
+ return c;
+}
+
+#if AO_RN_DEBUG
+static void
+ao_wrap_rn_putchar(char c)
+{
+ ao_usb_putchar(c); ao_usb_flush();
+ ao_serial_rn_putchar(c);
+}
+#else
+#define ao_wrap_rn_putchar ao_serial_rn_putchar
+#endif
+
+static void
+ao_rn_puts(char *s)
+{
+ char c;
+
+ while ((c = *s++))
+ ao_rn_putchar(c);
+}
+
+static void
+ao_rn_drain(void)
+{
+ int timeout = 0;
+
+ ao_rn_dbg("drain...\n");
+ ao_serial_rn_drain();
+ while (!timeout) {
+ ao_arch_block_interrupts();
+ while (_ao_rn_pollchar() == AO_READ_AGAIN) {
+ if (_ao_serial_rn_sleep_for(AO_MS_TO_TICKS(10))) {
+ timeout = 1;
+ break;
+ }
+ }
+ ao_arch_release_interrupts();
+ }
+ ao_rn_dbg("drain done\n");
+}
+
+static void
+ao_rn_send_cmd(char *cmd, char *param)
+{
+ ao_rn_dbg("send_cmd %s%s\n", cmd, param ? param : "");
+ ao_rn_drain();
+ ao_rn_puts(cmd);
+ if (param)
+ ao_rn_puts(param);
+ ao_rn_putchar('\r');
+}
+
+static int
+ao_rn_wait_char(AO_TICK_TYPE giveup_time)
+{
+ int c;
+
+ ao_arch_block_interrupts();
+ while ((c = _ao_rn_pollchar()) == AO_READ_AGAIN) {
+ AO_TICK_SIGNED delay = (AO_TICK_SIGNED) (giveup_time - ao_time());
+ if (delay < 0) {
+ ao_arch_release_interrupts();
+ return AO_READ_AGAIN;
+ }
+ _ao_serial_rn_sleep_for(delay);
+ }
+ ao_arch_release_interrupts();
+ return c;
+}
+
+static int
+ao_rn_wait_for(int timeout, char *match)
+{
+ char reply[AO_RN_MAX_REPLY_LEN + 1];
+ int match_len = strlen(match);
+ AO_TICK_TYPE giveup_time = ao_time() + timeout;
+ int c;
+
+ ao_rn_dbg("wait for %d, \"%s\"\n", timeout, match);
+ memset(reply, ' ', sizeof(reply));
+ while (memcmp(reply, match, match_len) != 0) {
+ c = ao_rn_wait_char(giveup_time);
+ if (c == AO_READ_AGAIN) {
+ ao_rn_dbg("\twait for timeout\n");
+ return AO_RN_TIMEOUT;
+ }
+ reply[match_len] = (char) c;
+ memmove(reply, reply+1, match_len);
+ reply[match_len] = '\0';
+ ao_rn_dbg("\tmatch now \"%s\"\n", reply);
+ }
+ ao_rn_dbg("\twait for ok\n");
+ return AO_RN_OK;
+}
+
+static int
+ao_rn_wait_line(AO_TICK_TYPE giveup_time, char *line, int len)
+{
+ char *l = line;
+
+ ao_rn_dbg("wait line\n");
+ for (;;) {
+ int c = ao_rn_wait_char(giveup_time);
+
+ /* timeout */
+ if (c == AO_READ_AGAIN) {
+ ao_rn_dbg("\twait line timeout\n");
+ return AO_RN_TIMEOUT;
+ }
+
+ /* done */
+ if (c == '\r') {
+ *l = '\0';
+ ao_rn_dbg("\twait line \"%s\"\n", line);
+ return AO_RN_OK;
+ }
+
+ if (c == '\n')
+ continue;
+
+ /* buffer overrun */
+ if (len <= 1)
+ return AO_RN_ERROR;
+
+ *l++ = (char) c;
+ len--;
+ }
+}
+
+static int
+ao_rn_wait_status(void)
+{
+ char message[AO_RN_MAX_REPLY_LEN];
+ AO_TICK_TYPE giveup_time = ao_time() + AO_RN_CMD_TIMEOUT;
+ int status;
+
+ ao_rn_dbg("wait status\n");
+ status = ao_rn_wait_line(giveup_time, message, sizeof (message));
+ if (status == AO_RN_OK)
+ if (strncmp(message, "AOK", 3) != 0)
+ status = AO_RN_ERROR;
+ return status;
+}
+
+static int
+ao_rn_set_name(void)
+{
+ char sn[8];
+ char *s = sn + 8;
+ char c;
+ int n;
+
+ ao_rn_dbg("set name...\n");
+ ao_rn_send_cmd(AO_RN_SET_NAME_CMD, "TeleBT-");
+ *--s = '\0';
+ *--s = '\r';
+ n = ao_serial_number;
+ do {
+ *--s = '0' + n % 10;
+ } while (n /= 10);
+ while ((c = *s++))
+ ao_rn_putchar(c);
+ return ao_rn_wait_status();
+}
+
+static int
+ao_rn_get_name(char *name, int len)
+{
+ ao_rn_dbg("get name...\n");
+ ao_rn_send_cmd(AO_RN_GET_NAME_CMD, NULL);
+ return ao_rn_wait_line(ao_time() + AO_RN_CMD_TIMEOUT, name, len);
+}
+
+static void
+ao_rn_check_link(void)
+{
+ ao_rn_connected = 1 - ao_gpio_get(AO_RN_CONNECTED_PORT, AO_RN_CONNECTED_PIN, foo);
+}
+
+static void
+ao_rn_isr(void)
+{
+ ao_rn_check_link();
+ ao_wakeup(&ao_rn_connected);
+}
+
+static void
+ao_bt_panic(int where)
+{
+ int i;
+ for (;;) {
+ for (i = 0; i < 50; i++) {
+ ao_led_toggle(AO_BT_LED);
+ ao_delay(AO_MS_TO_TICKS(10));
+ }
+ ao_led_off(AO_BT_LED);
+ ao_delay(AO_MS_TO_TICKS(500));
+ for (i = 0; i < where; i++) {
+ ao_led_for(AO_BT_LED, AO_MS_TO_TICKS(200));
+ ao_delay(AO_MS_TO_TICKS(200));
+ }
+ }
+}
+
+static uint8_t ao_rn_stdio;
+
+/*
+ * Set the stdio echo for the bluetooth link
+ */
+void
+ao_rn_echo(uint8_t echo)
+{
+ ao_stdios[ao_rn_stdio].echo = echo;
+}
+
+static void
+ao_rn(void)
+{
+ int status = AO_RN_ERROR;
+ char name[17];
+ int i;
+
+ ao_rn_dbg("ao_rn top\n");
+
+ /* Select CMD mode after the device gets out of reset */
+ ao_gpio_set(AO_RN_CMD_PORT, AO_RN_CMD_PIN, foo, AO_RN_CMD_CMD);
+
+ for (i = 0; i < 3; i++) {
+ ao_rn_dbg("reset device\n");
+
+ ao_gpio_set(AO_RN_RST_N_PORT, AO_RN_RST_N_PIN, foo, 0);
+ ao_delay(AO_MS_TO_TICKS(100));
+
+ /* Reboot the RN4678 and wait for it to start talking */
+ ao_rn_drain();
+ ao_gpio_set(AO_RN_RST_N_PORT, AO_RN_RST_N_PIN, foo, 1);
+ status = ao_rn_wait_for(AO_RN_REBOOT_TIMEOUT, AO_RN_REBOOT_MSG);
+ if (status != AO_RN_OK) {
+ ao_rn_dbg("reboot failed\n");
+ continue;
+ }
+
+ /* After it reboots, it can take a moment before it responds
+ * to commands
+ */
+ (void) ao_rn_wait_for(AO_RN_REBOOT_TIMEOUT, "CMD> ");
+
+ /* Check to see if the name is already set and assume
+ * that the device is ready to go
+ */
+ status = ao_rn_get_name(name, sizeof (name));
+ if (status != AO_RN_OK) {
+ ao_rn_dbg("get name failed\n");
+ continue;
+ }
+
+ if (strncmp(name, "TeleBT", 6) == 0) {
+ ao_rn_dbg("name is set\n");
+ status = AO_RN_OK;
+ break;
+ }
+
+ /* Make the command pin control command/data mode */
+ ao_rn_send_cmd(AO_RN_SET_COMMAND_PIN, NULL);
+ if (ao_rn_wait_status() != AO_RN_OK) {
+ ao_rn_dbg("set command pin failed\n");
+ continue;
+ }
+
+ /* Select 'fast' mode to ignore command sequence (more or less) */
+ ao_rn_send_cmd(AO_RN_SET_FAST_MODE, NULL);
+ if (ao_rn_wait_status() != AO_RN_OK) {
+ ao_rn_dbg("set fast mode failed\n");
+ continue;
+ }
+
+ /* Finally, set the name. Doing this last makes it possible to check
+ * if the whole sequence has been done
+ */
+ if (ao_rn_set_name() != AO_RN_OK) {
+ ao_rn_dbg("set name failed\n");
+ continue;
+ }
+
+ /* After we've configured the device, go back around and reboot it
+ * as that's how we get the new configuration to take effect
+ */
+ }
+ ao_rn_dbg("ao_rn status %d\n", status);
+
+ if (status != AO_RN_OK)
+ ao_bt_panic(4);
+
+ ao_gpio_set(AO_RN_CMD_PORT, AO_RN_CMD_PIN, foo, AO_RN_CMD_DATA);
+
+ /* Wait for the hardware to finish sending messages, then clear the queue */
+ ao_delay(AO_MS_TO_TICKS(200));
+ ao_rn_drain();
+
+ ao_exti_enable(AO_RN_CONNECTED_PORT, AO_RN_CONNECTED_PIN);
+
+#if 1
+ ao_rn_stdio = ao_add_stdio(_ao_wrap_rn_pollchar,
+ ao_wrap_rn_putchar,
+ NULL);
+
+ ao_rn_echo(0);
+
+ ao_rn_check_link();
+
+ ao_rn_dbg("RN running\n");
+
+ /*
+ * Now just hang around and flash the blue LED when we've got
+ * a connection
+ */
+ for (;;) {
+ ao_arch_block_interrupts();
+ while (!ao_rn_connected)
+ ao_sleep(&ao_rn_connected);
+ ao_arch_release_interrupts();
+ while (ao_rn_connected) {
+ ao_led_for(AO_BT_LED, AO_MS_TO_TICKS(20));
+ ao_delay(AO_SEC_TO_TICKS(3));
+ }
+ }
+#else
+
+ /*
+ * Separate debug code when things aren't working. Just dump
+ * inbound bluetooth characters to stdout
+ */
+ for (;;) {
+ int c;
+
+ while (rn_cmd_running)
+ ao_delay(AO_MS_TO_TICKS(1000));
+
+ ao_arch_block_interrupts();
+ while ((c = _ao_wrap_rn_pollchar()) == AO_READ_AGAIN)
+ ao_sleep(&ao_serial_rn_rx_fifo);
+ ao_arch_release_interrupts();
+ putchar(c); flush();
+ }
+#endif
+}
+
+static struct ao_task ao_rn_task;
+
+static void
+ao_rn_factory(void)
+{
+ int i;
+ int v = 0;
+
+ /*
+ * Factory reset. Flip pin P3_1 5 times within the first five
+ * seconds of power-on
+ */
+
+ /* Select our target output pin */
+ ao_enable_output(AO_RN_P3_1_PORT, AO_RN_P3_1_PIN, foo, v);
+
+ /* Turn off the BT device using the SW_BTN pin */
+ printf("Power down BT\n"); flush();
+ ao_gpio_set(AO_RN_SW_BTN_PORT, AO_RN_SW_BTN_PIN, foo, 0);
+ ao_delay(AO_MS_TO_TICKS(1000));
+
+ /* And turn it back on */
+ printf("Power up BT\n"); flush();
+ ao_gpio_set(AO_RN_SW_BTN_PORT, AO_RN_SW_BTN_PIN, foo, 1);
+
+ /* Right after power on, poke P3_1 five times to force a
+ * factory reset
+ */
+ for (i = 0; i < 10; i++) {
+ v = 1-v;
+ ao_delay(AO_MS_TO_TICKS(100));
+ ao_gpio_set(AO_RN_P3_1_PORT, AO_RN_P3_1_PIN, foo, v);
+ ao_led_toggle(AO_BT_LED);
+ }
+
+ /* And let P3_1 float again */
+ ao_enable_input(AO_RN_P3_1_PORT, AO_RN_P3_1_PIN, AO_EXTI_MODE_PULL_NONE);
+}
+
+static const struct ao_cmds rn_cmds[] = {
+ { ao_rn_factory, "F\0Factory reset rn4678" },
+ { 0 },
+};
+
+void
+ao_rn4678_init(void)
+{
+ (void) ao_rn_set_name;
+
+ ao_serial_rn_set_speed(AO_SERIAL_SPEED_115200);
+
+ /* Reset line */
+ ao_enable_output(AO_RN_RST_N_PORT, AO_RN_RST_N_PIN, foo, 0);
+
+ /* SW_BTN */
+ ao_enable_output(AO_RN_SW_BTN_PORT, AO_RN_SW_BTN_PIN, foo, 1);
+
+ /* P3_7 command/data selector */
+ ao_enable_output(AO_RN_CMD_PORT, AO_RN_CMD_PIN, foo, AO_RN_CMD_CMD);
+
+ ao_enable_input(AO_RN_CONNECTED_PORT, AO_RN_CONNECTED_PIN, AO_EXTI_MODE_PULL_NONE);
+ ao_exti_setup(AO_RN_CONNECTED_PORT, AO_RN_CONNECTED_PIN,
+ AO_EXTI_MODE_FALLING|AO_EXTI_MODE_RISING|AO_EXTI_PRIORITY_LOW,
+ ao_rn_isr);
+
+ ao_cmd_register(rn_cmds);
+ ao_add_task(&ao_rn_task, ao_rn, "bluetooth");
+}
projects / fw / altos / commitdiff