diff options
Diffstat (limited to 'bta/sys/ptim.c')
| -rw-r--r-- | bta/sys/ptim.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/bta/sys/ptim.c b/bta/sys/ptim.c new file mode 100644 index 0000000..24ed246 --- /dev/null +++ b/bta/sys/ptim.c @@ -0,0 +1,149 @@ +/***************************************************************************** +** +** Name: ptim.c +** +** Description: Protocol timer services. +** +** Copyright (c) 2003-2006, Broadcom Corp., All Rights Reserved. +** Widcomm Bluetooth Core. Proprietary and confidential. +** +*****************************************************************************/ + +#include "bt_target.h" +#include "gki.h" +#include "ptim.h" +#include "bta_sys.h" + +/******************************************************************************* +** +** Function ptim_init +** +** Description Initialize a protocol timer control block. Parameter +** period is the GKI timer period in milliseconds. Parameter +** timer_id is the GKI timer id. +** +** Returns void +** +*******************************************************************************/ +void ptim_init(tPTIM_CB *p_cb, UINT16 period, UINT8 timer_id) +{ + GKI_init_timer_list(&p_cb->timer_queue); + p_cb->period = period; + p_cb->timer_id = timer_id; +} + +/******************************************************************************* +** +** Function ptim_timer_update +** +** Description Update the protocol timer list and handle expired timers. +** This function is called from the task running the protocol +** timers when the periodic GKI timer expires. +** +** Returns void +** +*******************************************************************************/ +void ptim_timer_update(tPTIM_CB *p_cb) +{ + TIMER_LIST_ENT *p_tle; + BT_HDR *p_msg; + UINT32 new_ticks_count; + INT32 period_in_ticks; + + /* To handle the case when the function is called less frequently than the period + we must convert determine the number of ticks since the last update, then + convert back to milliseconds before updating timer list */ + new_ticks_count = GKI_get_tick_count(); + + /* Check for wrapped condition */ + if (new_ticks_count >= p_cb->last_gki_ticks) + { + period_in_ticks = (INT32)(new_ticks_count - p_cb->last_gki_ticks); + } + else + { + period_in_ticks = (INT32)(((UINT32)0xffffffff - p_cb->last_gki_ticks) + + new_ticks_count + 1); + } + + /* update timer list */ + GKI_update_timer_list(&p_cb->timer_queue, GKI_TICKS_TO_MS(period_in_ticks)); + + p_cb->last_gki_ticks = new_ticks_count; + + /* while there are expired timers */ + while((p_cb->timer_queue.p_first) && (p_cb->timer_queue.p_first->ticks <= 0)) + { + /* removed expired timer from list */ + p_tle = p_cb->timer_queue.p_first; + GKI_remove_from_timer_list(&p_cb->timer_queue, p_tle); + + /* call timer callback */ + if(p_tle->p_cback) + { + (*p_tle->p_cback)(p_tle); + } + else if(p_tle->event) + { + if ((p_msg = (BT_HDR *) GKI_getbuf(sizeof(BT_HDR))) != NULL) + { + p_msg->event = p_tle->event; + p_msg->layer_specific = 0; + bta_sys_sendmsg(p_msg); + } + } + } + + /* if timer list is empty stop periodic GKI timer */ + if (p_cb->timer_queue.p_first == NULL) + { + GKI_stop_timer(p_cb->timer_id); + } +} + +/******************************************************************************* +** +** Function ptim_start_timer +** +** Description Start a protocol timer for the specified amount +** of time in seconds. +** +** Returns void +** +*******************************************************************************/ +void ptim_start_timer(tPTIM_CB *p_cb, TIMER_LIST_ENT *p_tle, UINT16 type, INT32 timeout) +{ + /* if timer list is currently empty, start periodic GKI timer */ + if (p_cb->timer_queue.p_first == NULL) + { + p_cb->last_gki_ticks = GKI_get_tick_count(); + GKI_start_timer(p_cb->timer_id, GKI_MS_TO_TICKS(p_cb->period), TRUE); + } + + GKI_remove_from_timer_list(&p_cb->timer_queue, p_tle); + + p_tle->event = type; + p_tle->ticks = timeout; + + GKI_add_to_timer_list(&p_cb->timer_queue, p_tle); +} + +/******************************************************************************* +** +** Function ptim_stop_timer +** +** Description Stop a protocol timer. +** +** Returns void +** +*******************************************************************************/ +void ptim_stop_timer(tPTIM_CB *p_cb, TIMER_LIST_ENT *p_tle) +{ + GKI_remove_from_timer_list (&p_cb->timer_queue, p_tle); + + /* if timer list is empty stop periodic GKI timer */ + if (p_cb->timer_queue.p_first == NULL) + { + GKI_stop_timer(p_cb->timer_id); + } +} |