csr867x source这段代码怎么理解？
本帖最后由 bluetooth123 于 2020-3-30 23:30 编辑第一次开机进入idle模式，此时delay的初始值为0，且pskey ps_timers对应的值也为0，也就是delay==0，怎么进入的APP_ENTER_PAIRING_STATE_FROM_IDLE, APP_ENTER_CONNECTABLE_STATE_FROM_IDLE？
if (delay != 0)
{
/* enter connectable or discoverable state if a delay has been configured */
if (BdaddrIsZero(&theSource->ps_config->bdaddr_remote_device) || theSource->inquiry_mode.force_inquiry_mode)
{
/* no device to connect to, go discoverable */
MessageSend(&theSource->app_data.appTask, APP_ENTER_PAIRING_STATE_FROM_IDLE, 0);
}
else
{
/* there is a device to connect to, go connectable */
MessageSend(&theSource->app_data.appTask, APP_ENTER_CONNECTABLE_STATE_FROM_IDLE, 0);
}
}
完整代码地方，
static void states_enter_state_idle(SOURCE_STATE_T old_state)
{
uint16 delay = 0; /* default is to have no delay before next connection attempt */
switch (old_state)
{
case SOURCE_STATE_CONNECTING:
{
if (theSource->ps_config->features.connection_max_retries != INVALID_VALUE)
{
/* feature enabled to only try to a remote device a set number of times before giving up */
if ((theSource->connection_data.connection_retries < theSource->ps_config->features.connection_max_retries) ||
theSource->timer_data.timers_stopped)
{
/* if it was connnecting use the connection_idle_timer delay before next connection attempt */
delay = theSource->ps_config->ps_timers.connection_idle_timer;
STATES_DEBUG(("STATE: was connecting, connection attempts:[%d], can continue after delay:[%d secs]\n", theSource->connection_data.connection_retries, delay));
if (!theSource->timer_data.timers_stopped)
{
/* increase number of connections attempted if timers haven't been bypassed */
theSource->connection_data.connection_retries++;
}
}
else
{
/* configured number of connection attempts have been tried - give up connecting! */
delay = TIMER_NO_TIMEOUT;
theSource->connection_data.connection_retries = 0;
STATES_DEBUG(("STATE: was connecting, given up trying to connect\n"));
}
}
else
{
/* if it was connnecting use the connection_idle_timer delay before next connection attempt */
delay = theSource->ps_config->ps_timers.connection_idle_timer;
STATES_DEBUG(("STATE: was connecting, next connect delay:[%d secs]\n", delay));
}
}
break;
case SOURCE_STATE_CONNECTED:
{
/* if it was connnected use the disconnect_idle_timer delay before next connection attempt */
delay = theSource->ps_config->ps_timers.disconnect_idle_timer;
STATES_DEBUG(("STATE: was connected, delay:[%d secs]\n", delay));
}
break;
case SOURCE_STATE_INITIALISING:
case SOURCE_STATE_POWERED_OFF:
{
if (BdaddrIsZero(&theSource->ps_config->bdaddr_remote_device))
{
/* if the device was powered off and no previous connection exists:
use the power_on_discover_idle_timer before first discovery attempt */
delay = theSource->ps_config->ps_timers.power_on_discover_idle_timer;
}
else
{
/* if the device was powered off and a previous connection exists:
use the power_on_connect_idle_timer before first connection attempt */
delay = theSource->ps_config->ps_timers.power_on_connect_idle_timer;
}
}
break;
default:
{
}
break;
}
if (old_state != SOURCE_STATE_CONNECTING)
{
/* reset connection attempts if not currently connecting */
theSource->connection_data.connection_retries = 0;
}
if (delay != 0)
{
/* enter connectable or discoverable state if a delay has been configured */
if (BdaddrIsZero(&theSource->ps_config->bdaddr_remote_device) || theSource->inquiry_mode.force_inquiry_mode)
{
/* no device to connect to, go discoverable */
MessageSend(&theSource->app_data.appTask, APP_ENTER_PAIRING_STATE_FROM_IDLE, 0);
}
else
{
/* there is a device to connect to, go connectable */
MessageSend(&theSource->app_data.appTask, APP_ENTER_CONNECTABLE_STATE_FROM_IDLE, 0);
}
}
if (delay != TIMER_NO_TIMEOUT)
{
STATES_DEBUG(("STATE: IDLE delay before next connection:[%d secs]\n", delay));
/* initialise the connection with the connection manager */
connection_mgr_start_connection_attempt(NULL, AGHFP_PROFILE_IS_ENABLED ? PROFILE_AGHFP : PROFILE_A2DP, delay);
}
else
{
STATES_DEBUG(("STATE: No auto reconnection\n"));
}
}
看到了，这里面执行的。
MessageSendLater(app_get_instance(), APP_CONNECT_REQ, message, D_SEC(delay));
static void app_connect_req(const APP_CONNECT_REQ_T *message)
{
APP_MSG_DEBUG(("APP_MSG: app_connect_req\n"));
/* cancel any other connection requests as they may come from user or be automatically generated */
MessageCancelAll(app_get_instance(), APP_CONNECT_REQ);
switch (states_get_state())
{
case SOURCE_STATE_IDLE:
case SOURCE_STATE_CONNECTABLE:
case SOURCE_STATE_DISCOVERABLE:
case SOURCE_STATE_INQUIRING: /* connect after device found through inquiry */
case SOURCE_STATE_CONNECTING: /* this will occur when trying to connect further profiles - re-enter state to kick connection */
case SOURCE_STATE_CONNECTED:
{
/* suspend any active audio */
MessageSend(app_get_instance(), APP_AUDIO_SUSPEND, 0);
/* connect to remote device */
if (BdaddrIsZero(connection_mgr_get_remote_address()) || message->force_inquiry_mode)
{
states_set_state(SOURCE_STATE_INQUIRING);
}
else
{
states_set_state(SOURCE_STATE_CONNECTING);
}
}
break;
default:
{
app_msg_unhandled_state();
}
break;
}
}
完整代码states_enter_state_idle中的if (delay != 0)代码：
1，如果从关机状态 开机 进入idle模式，如果 delay不等于0，那么执行以下内容：
2，如果无已连接设备记录BdaddrIsZero或者处于强制进入配对模式，那么发送消息APP_ENTER_PAIRING_STATE_FROM_IDLE；否则发送消息APP_ENTER_CONNECTABLE_STATE_FROM_IDLE
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