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first commit and add gitignore, README.md

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ChesterTseng 2016-06-04 19:09:35 +08:00
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component/common/mbed/targets/hal/rtl8195a/us_ticker.c Executable file
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/* mbed Microcontroller Library
*******************************************************************************
* Copyright (c) 2014, Realtek Semiconductor Corp.
* All rights reserved.
*
* This module is a confidential and proprietary property of RealTek and
* possession or use of this module requires written permission of RealTek.
*******************************************************************************
*/
#include "objects.h"
#include <stddef.h>
#include "us_ticker_api.h"
#include "PeripheralNames.h"
#define SYS_TIM_ID 1 // the G-Timer ID for System
#define APP_TIM_ID 6 // the G-Timer ID for Application
static int us_ticker_inited = 0;
static TIMER_ADAPTER TimerAdapter;
extern HAL_TIMER_OP HalTimerOp;
VOID _us_ticker_irq_handler(IN VOID *Data)
{
us_ticker_irq_handler();
}
void us_ticker_init(void)
{
if (us_ticker_inited) return;
us_ticker_inited = 1;
// Initial a G-Timer
TimerAdapter.IrqDis = 1; // Disable Irq
TimerAdapter.IrqHandle.IrqFun = (IRQ_FUN) _us_ticker_irq_handler;
TimerAdapter.IrqHandle.IrqNum = TIMER2_7_IRQ;
TimerAdapter.IrqHandle.Priority = 0x20;
TimerAdapter.IrqHandle.Data = (u32)NULL;
TimerAdapter.TimerId = APP_TIM_ID;
TimerAdapter.TimerIrqPriority = 0;
TimerAdapter.TimerLoadValueUs = 1;
TimerAdapter.TimerMode = FREE_RUN_MODE; // Countdown Free Run
HalTimerOp.HalTimerInit((VOID*) &TimerAdapter);
DBG_TIMER_INFO("%s: Timer_Id=%d\n", __FUNCTION__, APP_TIM_ID);
}
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);
}
void us_ticker_set_interrupt(timestamp_t timestamp)
{
uint32_t cur_time_us;
uint32_t time_def;
cur_time_us = us_ticker_read();
if ((uint32_t)timestamp >= cur_time_us) {
time_def = (uint32_t)timestamp - cur_time_us;
}
else {
time_def = 0xffffffff - cur_time_us + (uint32_t)timestamp;
}
if (time_def < TIMER_TICK_US) {
time_def = TIMER_TICK_US; // at least 1 tick
}
TimerAdapter.IrqDis = 0; // Enable Irq
TimerAdapter.TimerLoadValueUs = time_def;
TimerAdapter.TimerMode = USER_DEFINED; // Countdown Free Run
HalTimerOp.HalTimerInit((VOID*) &TimerAdapter);
}
void us_ticker_disable_interrupt(void)
{
HalTimerOp.HalTimerDis((u32)TimerAdapter.TimerId);
}
void us_ticker_clear_interrupt(void)
{
HalTimerOp.HalTimerIrqClear((u32)TimerAdapter.TimerId);
}