/* 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 #include "us_ticker_api.h" #include "PeripheralNames.h" #define TICK_READ_FROM_CPU 0 //1: read tick from CPU, 0: read tick from G-Timer #define GTIMER_CLK_HZ (32768) #define GTIMER_TICK_US (1000000/GTIMER_CLK_HZ) #define SYS_TIM_ID 0 // the G-Timer ID for System #define APP_TIM_ID 1 // the G-Timer ID for Application static int us_ticker_inited = 0; VOID _us_ticker_irq_handler(void *Data) { us_ticker_irq_handler(); } void us_ticker_init(void) { RTIM_TimeBaseInitTypeDef TIM_InitStruct; if (us_ticker_inited) return; us_ticker_inited = 1; RTIM_TimeBaseStructInit(&TIM_InitStruct); TIM_InitStruct.TIM_Idx = APP_TIM_ID; TIM_InitStruct.TIM_Prescaler = 0; TIM_InitStruct.TIM_Period = 0xFFFFFFFF; TIM_InitStruct.TIM_UpdateEvent = ENABLE; /* UEV enable */ TIM_InitStruct.TIM_UpdateSource = TIM_UpdateSource_Overflow; TIM_InitStruct.TIM_ARRProtection = ENABLE; RTIM_TimeBaseInit(TIM1, &TIM_InitStruct, 0, (IRQ_FUN) _us_ticker_irq_handler, (u32)NULL); RTIM_Cmd(TIM0, ENABLE); DBG_PRINTF(MODULE_TIMER, LEVEL_INFO, "%s: Timer_Id=%d\n", __FUNCTION__, APP_TIM_ID); } #if (!TICK_READ_FROM_CPU) || !defined(PLATFORM_FREERTOS) uint32_t us_ticker_read() { uint32_t tick_cnt; uint32_t ticks_125ms; uint32_t ticks_remain; uint64_t us_tick; tick_cnt = SYSTIMER_TickGet(); //up counter us_tick = tick_cnt * (1000000/32768); return ((uint32_t)us_tick); } #else // if the system tick didn't be initialed, call delay function may got system hang #define OS_CLOCK (200000000UL/6*5) // CPU clock = 166.66 MHz #define OS_TICK 1000 // OS ticks 1000/sec #define OS_TRV ((uint32_t)(((double)OS_CLOCK*(double)OS_TICK)/1E6)-1) #define NVIC_ST_CTRL (*((volatile uint32_t *)0xE000E010)) #define NVIC_ST_RELOAD (*((volatile uint32_t *)0xE000E014)) #define NVIC_ST_CURRENT (*((volatile uint32_t *)0xE000E018)) extern uint32_t xTaskGetTickCount( void ); uint32_t us_ticker_read() { uint32_t tick_cnt; uint32_t us_tick, ms; static uint32_t last_us_tick=0; ms = xTaskGetTickCount(); us_tick = (uint32_t)(ms*1000); tick_cnt = OS_TRV - NVIC_ST_CURRENT; us_tick += (uint32_t)((tick_cnt*1000)/(OS_TRV+1) ); if ( (last_us_tick > us_tick) && (last_us_tick < 0xFFFFFC00) ) { us_tick += 1000; } last_us_tick = us_tick; return us_tick; } #endif void us_ticker_set_interrupt(timestamp_t timestamp) { uint32_t cur_time_us; uint32_t duration_us; uint32_t timer_tick = 0; cur_time_us = us_ticker_read(); if ((uint32_t)timestamp >= cur_time_us) { duration_us = (uint32_t)timestamp - cur_time_us; } else { duration_us = 0xffffffff - cur_time_us + (uint32_t)timestamp; } if (duration_us < TIMER_TICK_US) { duration_us = TIMER_TICK_US; // at least 1 tick } timer_tick = (uint32_t)((float)duration_us / 1000000 *32000); RTIM_ChangePeriod(TIMx[APP_TIM_ID], timer_tick); } void us_ticker_disable_interrupt(void) { RTIM_Cmd(TIMx[APP_TIM_ID], DISABLE); } void us_ticker_clear_interrupt(void) { RTIM_INTClear(TIMx[APP_TIM_ID]); }