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104 lines
3 KiB
C
104 lines
3 KiB
C
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/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2014, Realtek Semiconductor Corp.
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* All rights reserved.
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*
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* This module is a confidential and proprietary property of RealTek and
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* possession or use of this module requires written permission of RealTek.
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*******************************************************************************
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*/
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#include "objects.h"
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#include <stddef.h>
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#include "us_ticker_api.h"
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#include "PeripheralNames.h"
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#define SYS_TIM_ID 1 // the G-Timer ID for System
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#define APP_TIM_ID 6 // the G-Timer ID for Application
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static int us_ticker_inited = 0;
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static TIMER_ADAPTER TimerAdapter;
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extern HAL_TIMER_OP HalTimerOp;
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VOID _us_ticker_irq_handler(IN VOID *Data)
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{
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us_ticker_irq_handler();
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}
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void us_ticker_init(void)
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{
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if (us_ticker_inited) return;
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us_ticker_inited = 1;
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// Initial a G-Timer
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TimerAdapter.IrqDis = 1; // Disable Irq
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TimerAdapter.IrqHandle.IrqFun = (IRQ_FUN) _us_ticker_irq_handler;
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TimerAdapter.IrqHandle.IrqNum = TIMER2_7_IRQ;
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TimerAdapter.IrqHandle.Priority = 0x20;
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TimerAdapter.IrqHandle.Data = (u32)NULL;
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TimerAdapter.TimerId = APP_TIM_ID;
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TimerAdapter.TimerIrqPriority = 0;
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TimerAdapter.TimerLoadValueUs = 1;
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TimerAdapter.TimerMode = FREE_RUN_MODE; // Countdown Free Run
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HalTimerOp.HalTimerInit((VOID*) &TimerAdapter);
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DBG_TIMER_INFO("%s: Timer_Id=%d\n", __FUNCTION__, APP_TIM_ID);
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}
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uint32_t us_ticker_read()
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{
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uint32_t tick_cnt;
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uint32_t ticks_125ms;
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uint32_t ticks_remain;
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uint64_t us_tick;
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//1 Our G-timer resolution is ~31 us (1/32K), and is a countdown timer
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// if (!us_ticker_inited) {
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// us_ticker_init();
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// }
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tick_cnt = HalTimerOp.HalTimerReadCount(SYS_TIM_ID);
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tick_cnt = 0xffffffff - tick_cnt; // it's a down counter
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ticks_125ms = tick_cnt/(GTIMER_CLK_HZ/8);
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ticks_remain = tick_cnt - (ticks_125ms*(GTIMER_CLK_HZ/8));
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us_tick = ticks_125ms * 125000;
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us_tick += (ticks_remain * 1000000)/GTIMER_CLK_HZ;
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return ((uint32_t)us_tick);
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}
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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uint32_t cur_time_us;
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uint32_t time_def;
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cur_time_us = us_ticker_read();
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if ((uint32_t)timestamp >= cur_time_us) {
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time_def = (uint32_t)timestamp - cur_time_us;
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}
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else {
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time_def = 0xffffffff - cur_time_us + (uint32_t)timestamp;
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}
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if (time_def < TIMER_TICK_US) {
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time_def = TIMER_TICK_US; // at least 1 tick
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}
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TimerAdapter.IrqDis = 0; // Enable Irq
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TimerAdapter.TimerLoadValueUs = time_def;
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TimerAdapter.TimerMode = USER_DEFINED; // Countdown Free Run
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HalTimerOp.HalTimerInit((VOID*) &TimerAdapter);
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}
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void us_ticker_disable_interrupt(void)
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{
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HalTimerOp.HalTimerDis((u32)TimerAdapter.TimerId);
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}
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void us_ticker_clear_interrupt(void)
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{
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HalTimerOp.HalTimerIrqClear((u32)TimerAdapter.TimerId);
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}
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