mirror of
https://github.com/jialexd/sdk-ameba-v4.0c_180328.git
synced 2024-11-24 23:14:18 +00:00
128 lines
3.5 KiB
C
Executable file
128 lines
3.5 KiB
C
Executable file
/* 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 TICK_READ_FROM_CPU 0 //1: read tick from CPU, 0: read tick from G-Timer
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#define GTIMER_CLK_HZ (32768)
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#define GTIMER_TICK_US (1000000/GTIMER_CLK_HZ)
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#define SYS_TIM_ID 0 // the G-Timer ID for System
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#define APP_TIM_ID 1 // the G-Timer ID for Application
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static int us_ticker_inited = 0;
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VOID _us_ticker_irq_handler(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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RTIM_TimeBaseInitTypeDef TIM_InitStruct;
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if (us_ticker_inited)
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return;
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us_ticker_inited = 1;
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RTIM_TimeBaseStructInit(&TIM_InitStruct);
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TIM_InitStruct.TIM_Idx = APP_TIM_ID;
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TIM_InitStruct.TIM_Prescaler = 0;
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TIM_InitStruct.TIM_Period = 0xFFFFFFFF;
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TIM_InitStruct.TIM_UpdateEvent = ENABLE; /* UEV enable */
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TIM_InitStruct.TIM_UpdateSource = TIM_UpdateSource_Overflow;
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TIM_InitStruct.TIM_ARRProtection = ENABLE;
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RTIM_TimeBaseInit(TIM1, &TIM_InitStruct, 0, (IRQ_FUN) _us_ticker_irq_handler, (u32)NULL);
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RTIM_Cmd(TIM0, ENABLE);
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DBG_PRINTF(MODULE_TIMER, LEVEL_INFO, "%s: Timer_Id=%d\n", __FUNCTION__, APP_TIM_ID);
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}
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#if (!TICK_READ_FROM_CPU) || !defined(PLATFORM_FREERTOS)
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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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tick_cnt = SYSTIMER_TickGet(); //up counter
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us_tick = tick_cnt * (1000000/32768);
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return ((uint32_t)us_tick);
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}
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#else
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// if the system tick didn't be initialed, call delay function may got system hang
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#define OS_CLOCK (200000000UL/6*5) // CPU clock = 166.66 MHz
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#define OS_TICK 1000 // OS ticks 1000/sec
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#define OS_TRV ((uint32_t)(((double)OS_CLOCK*(double)OS_TICK)/1E6)-1)
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#define NVIC_ST_CTRL (*((volatile uint32_t *)0xE000E010))
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#define NVIC_ST_RELOAD (*((volatile uint32_t *)0xE000E014))
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#define NVIC_ST_CURRENT (*((volatile uint32_t *)0xE000E018))
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extern uint32_t xTaskGetTickCount( void );
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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 us_tick, ms;
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static uint32_t last_us_tick=0;
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ms = xTaskGetTickCount();
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us_tick = (uint32_t)(ms*1000);
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tick_cnt = OS_TRV - NVIC_ST_CURRENT;
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us_tick += (uint32_t)((tick_cnt*1000)/(OS_TRV+1) );
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if ( (last_us_tick > us_tick) && (last_us_tick < 0xFFFFFC00) ) {
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us_tick += 1000;
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}
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last_us_tick = us_tick;
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return us_tick;
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}
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#endif
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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 duration_us;
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uint32_t timer_tick = 0;
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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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duration_us = (uint32_t)timestamp - cur_time_us;
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}
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else {
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duration_us = 0xffffffff - cur_time_us + (uint32_t)timestamp;
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}
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if (duration_us < TIMER_TICK_US) {
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duration_us = TIMER_TICK_US; // at least 1 tick
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}
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timer_tick = (uint32_t)((float)duration_us / 1000000 *32000);
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RTIM_ChangePeriod(TIMx[APP_TIM_ID], timer_tick);
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}
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void us_ticker_disable_interrupt(void)
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{
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RTIM_Cmd(TIMx[APP_TIM_ID], DISABLE);
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}
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void us_ticker_clear_interrupt(void)
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{
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RTIM_INTClear(TIMx[APP_TIM_ID]);
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}
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