uint32_t us_ticker_read() { uint32_t tick_cnt; uint64_t us_tick; //1 Our G-timer resolution is ~31 us (1/32K), and is a countdown timer if (!us_ticker_inited) us_ticker_init(); tick_cnt = HalTimerOp.HalTimerReadCount(SYS_TIM_ID); us_tick = TIMER_TICK_US*(0xffffffff - tick_cnt); // TODO: handle overflow return ((uint32_t)us_tick); }
uint32_t us_ticker_read() { uint32_t tick_cnt; uint32_t ticks_125ms; uint32_t ticks_remain; uint64_t us_tick; //1 Our G-timer resolution is ~31 us (1/32K), and is a countdown timer // if (!us_ticker_inited) { // us_ticker_init(); // } tick_cnt = HalTimerOp.HalTimerReadCount(SYS_TIM_ID); tick_cnt = 0xffffffff - tick_cnt; // it's a down counter ticks_125ms = tick_cnt/(GTIMER_CLK_HZ/8); ticks_remain = tick_cnt - (ticks_125ms*(GTIMER_CLK_HZ/8)); us_tick = ticks_125ms * 125000; us_tick += (ticks_remain * 1000000)/GTIMER_CLK_HZ; return ((uint32_t)us_tick); }
uint32_t us_ticker_read() { uint32_t tick_cnt; uint32_t tick_cnt_div_4; uint32_t tick_cnt_mod_4; uint64_t us_tick; //1 Our G-timer resolution is ~31 us (1/32K), and is a countdown timer // if (!us_ticker_inited) { // us_ticker_init(); // } tick_cnt = HalTimerOp.HalTimerReadCount(SYS_TIM_ID); tick_cnt = 0xffffffff - tick_cnt; // it's a down counter tick_cnt_div_4 = tick_cnt >> 2; tick_cnt_mod_4 = tick_cnt - (tick_cnt_div_4 << 2); us_tick = (TIMER_TICK_US_X4*tick_cnt_div_4) + (TIMER_TICK_US*tick_cnt_mod_4); // TODO: handle overflow return ((uint32_t)us_tick); }
void us_ticker_set_interrupt(timestamp_t timestamp) { uint32_t tick_cnt; uint32_t cur_tick_cnt; uint32_t time_def; tick_cnt = (uint32_t)timestamp/TIMER_TICK_US; cur_tick_cnt = 0xffffffff - HalTimerOp.HalTimerReadCount(SYS_TIM_ID); if (tick_cnt > cur_tick_cnt) { time_def = tick_cnt - cur_tick_cnt; } else { time_def = 0xffffffff - cur_tick_cnt + tick_cnt; } TimerAdapter.IrqDis = 0; // Enable Irq TimerAdapter.TimerLoadValueUs = time_def * TIMER_TICK_US; TimerAdapter.TimerMode = USER_DEFINED; // Countdown Free Run HalTimerOp.HalTimerInit((VOID*) &TimerAdapter); }
uint32_t gtimer_read_tick (gtimer_t *obj) { PTIMER_ADAPTER pTimerAdapter = &obj->hal_gtimer_adp; return (HalTimerOp.HalTimerReadCount(pTimerAdapter->TimerId)); }