mirror of
https://github.com/weston-embedded/uC-OS3.git
synced 2026-09-23 16:20:22 +08:00
forg0ne
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/*
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*********************************************************************************************************
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* uC/OS-III
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* The Real-Time Kernel
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*
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* Copyright 2009-2020 Silicon Laboratories Inc. www.silabs.com
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*
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* SPDX-License-Identifier: APACHE-2.0
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*
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* This software is subject to an open source license and is distributed by
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* Silicon Laboratories Inc. pursuant to the terms of the Apache License,
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* Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
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*
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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*
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* uC/OS-III BOARD SUPPORT PACKAGE
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* Dynamic Tick BSP
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*
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* Filename : bsp_os_dt.c
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* INCLUDE FILES
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*********************************************************************************************************
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*/
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#include <cpu_core.h>
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#include <os.h>
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/*
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*********************************************************************************************************
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* LOCAL DEFINES
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*********************************************************************************************************
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*/
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#if (OS_CFG_DYN_TICK_EN == DEF_ENABLED)
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#define TIMER_COUNT_HZ ($$$$) /* Frequency of the Dynamic Tick Timer. */
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#define TIMER_TO_OSTICK(count) (((CPU_INT64U)(count) * OS_CFG_TICK_RATE_HZ) / TIMER_COUNT_HZ)
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#define OSTICK_TO_TIMER(ostick) (((CPU_INT64U)(ostick) * TIMER_COUNT_HZ) / OS_CFG_TICK_RATE_HZ)
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/* The max timer count should end on a 1 tick boundary. */
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#define TIMER_COUNT_MAX (DEF_INT_32U_MAX_VAL - (DEF_INT_32U_MAX_VAL % OSTICK_TO_TIMER(1u)))
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#endif
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/*
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*********************************************************************************************************
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* LOCAL VARIABLES
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*********************************************************************************************************
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*/
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#if (OS_CFG_DYN_TICK_EN == DEF_ENABLED)
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static OS_TICK TickDelta = 0u; /* Stored in OS Tick units. */
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#endif
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/*
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*********************************************************************************************************
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* LOCAL FUNCTION PROTOTYPES
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*********************************************************************************************************
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*/
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#if (OS_CFG_DYN_TICK_EN == DEF_ENABLED)
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static void BSP_DynTick_ISRHandler(void);
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#endif
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/*
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*********************************************************************************************************
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*********************************************************************************************************
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* GLOBAL FUNCTIONS
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*********************************************************************************************************
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* BSP_OS_TickInit()
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*
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* Description : Initializes the tick interrupt for the OS.
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*
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* Argument(s) : none.
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*
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* Return(s) : none.
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*
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* Note(s) : (1) Must be called prior to OSStart() in main().
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*
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* (2) This function ensures that the tick interrupt is disabled until BSP_OS_TickEn() is
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* called in the startup task.
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*********************************************************************************************************
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*/
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void BSP_OS_TickInit (void)
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{
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/* $$$$ */ /* Stop the Dynamic Tick Timer if running. */
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/* $$$$ */ /* Configure the timer. */
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/* $$$$ */ /* Frequency : TIMER_COUNT_HZ */
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/* $$$$ */ /* Counter Match Value : TIMER_COUNT_MAX */
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/* $$$$ */ /* Counter Value : 0 */
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/* $$$$ */ /* Interrupt : On counter match */
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/* $$$$ */ /* Install BSP_DynTick_ISRHandler as the int. handler. */
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/* $$$$ */ /* Start the timer. */
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}
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/*
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*********************************************************************************************************
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* BSP_OS_TickEnable()
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*
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* Description : Enable the OS tick interrupt.
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*
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* Argument(s) : none.
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*
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* Return(s) : none.
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*
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* Note(s) : none
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*********************************************************************************************************
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*/
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void BSP_OS_TickEnable (void)
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{
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/* $$$$ */ /* Enable Timer interrupt. */
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/* $$$$ */ /* Start the Timer count generation. */
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}
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/*
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*********************************************************************************************************
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* BSP_OS_TickDisable()
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*
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* Description : Disable the OS tick interrupt.
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*
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* Argument(s) : none.
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*
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* Return(s) : none.
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*
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* Note(s) : none
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*********************************************************************************************************
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*/
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void BSP_OS_TickDisable (void)
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{
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/* $$$$ */ /* Stop the Timer count generation. */
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/* $$$$ */ /* Disable Timer interrupt. */
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}
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/*
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*********************************************************************************************************
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*********************************************************************************************************
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** uC/OS-III DYNAMIC TICK
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*********************************************************************************************************
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*********************************************************************************************************
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*/
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#if (OS_CFG_DYN_TICK_EN == DEF_ENABLED)
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/*
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*********************************************************************************************************
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* OS_DynTickGet()
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*
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* Description : Get the number of ticks which have elapsed since the last delta was set.
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*
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* Argument(s) : none.
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*
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* Return(s) : An unsigned integer between 0 and TickDelta, inclusive.
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*
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* Note(s) : 1) This function is an INTERNAL uC/OS-III function & MUST NOT be called by the
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* application.
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*
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* 2) This function is called with kernel-aware interrupts disabled.
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*********************************************************************************************************
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*/
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OS_TICK OS_DynTickGet (void)
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{
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CPU_INT32U tmrcnt;
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tmrcnt = /* $$$$ */; /* Read current timer count. */
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if (/* $$$$ */) { /* Check timer interrupt flag. */
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return (TickDelta); /* Counter Overflow has occured. */
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}
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tmrcnt = TIMER_TO_OSTICK(tmrcnt); /* Otherwise, the value we read is valid. */
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return ((OS_TICK)tmrcnt);
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}
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/*
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*********************************************************************************************************
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* OS_DynTickSet()
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*
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* Description : Sets the number of ticks that the kernel wants to expire before the next interrupt.
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*
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* Argument(s) : ticks number of ticks the kernel wants to delay.
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* 0 indicates an indefinite delay.
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*
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* Return(s) : The actual number of ticks which will elapse before the next interrupt.
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* (See Note #3).
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*
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* Note(s) : 1) This function is an INTERNAL uC/OS-III function & MUST NOT be called by the
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* application.
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*
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* 2) This function is called with kernel-aware interrupts disabled.
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*
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* 3) It is possible for the kernel to specify a delay that is too large for our
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* hardware timer, or an indefinite delay. In these cases, we should program the timer
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* to count the maximum number of ticks possible. The value we return should then
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* be the timer maximum converted into units of OS_TICK.
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*********************************************************************************************************
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*/
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OS_TICK OS_DynTickSet (OS_TICK ticks)
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{
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CPU_INT32U tmrcnt;
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tmrcnt = OSTICK_TO_TIMER(ticks);
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if ((tmrcnt >= TIMER_COUNT_MAX) || /* If the delay exceeds our timer's capacity, ... */
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(tmrcnt == 0u)) { /* ... or the kernel wants an indefinite delay. */
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tmrcnt = TIMER_COUNT_MAX; /* Count as many ticks as we are able. */
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}
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TickDelta = TIMER_TO_OSTICK(tmrcnt); /* Convert the timer count into OS_TICK units. */
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/* $$$$ */ /* Stop the timer. */
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/* $$$$ */ /* Clear the timer interrupt. */
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/* Set new timeout. */
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/* $$$$ */ /* Counter Match Value : tmrcnt */
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/* $$$$ */ /* Counter Value : 0 */
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/* $$$$ */ /* Start the timer. */
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return (TickDelta); /* Return the number ticks that will elapse before ... */
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/* ... the next interrupt. */
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}
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/*
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*********************************************************************************************************
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* BSP_DynTick_ISRHandler()
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*
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* Description : Dynamic Tick ISR handler.
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*
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* Argument(s) : none.
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*
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* Return(s) : none.
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*
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* Note(s) : none.
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*********************************************************************************************************
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*/
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static void BSP_DynTick_ISRHandler (void)
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{
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CPU_SR_ALLOC();
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CPU_CRITICAL_ENTER();
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OSIntEnter();
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CPU_CRITICAL_EXIT();
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OSTimeDynTick(TickDelta); /* Next delta will be set by the kernel. */
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OSIntExit();
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}
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#endif /* End of uC/OS-III Dynamic Tick module. */
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/*
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*********************************************************************************************************
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* MODULE END
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*********************************************************************************************************
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*/
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