Fork of Smoothie to port to mbed non-LPC targets.
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Diff: libs/LPC17xx/LPC17xxLib/src/lpc17xx_systick.c
- Revision:
- 3:f151d08d335c
- Parent:
- 2:1df0b61d3b5a
--- a/libs/LPC17xx/LPC17xxLib/src/lpc17xx_systick.c Fri Feb 28 18:52:52 2014 -0800 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,190 +0,0 @@ -#ifdef __LPC17XX__ - -/********************************************************************** -* $Id$ lpc17xx_systick.c 2010-05-21 -*//** -* @file lpc17xx_systick.c -* @brief Contains all functions support for SYSTICK firmware library -* on LPC17xx -* @version 2.0 -* @date 21. May. 2010 -* @author NXP MCU SW Application Team -* -* Copyright(C) 2010, NXP Semiconductor -* All rights reserved. -* -*********************************************************************** -* Software that is described herein is for illustrative purposes only -* which provides customers with programming information regarding the -* products. This software is supplied "AS IS" without any warranties. -* NXP Semiconductors assumes no responsibility or liability for the -* use of the software, conveys no license or title under any patent, -* copyright, or mask work right to the product. NXP Semiconductors -* reserves the right to make changes in the software without -* notification. NXP Semiconductors also make no representation or -* warranty that such application will be suitable for the specified -* use without further testing or modification. -**********************************************************************/ - -/* Peripheral group ----------------------------------------------------------- */ -/** @addtogroup SYSTICK - * @{ - */ - -/* Includes ------------------------------------------------------------------- */ -#include "lpc17xx_systick.h" -#include "lpc17xx_clkpwr.h" - -/* If this source file built with example, the LPC17xx FW library configuration - * file in each example directory ("lpc17xx_libcfg.h") must be included, - * otherwise the default FW library configuration file must be included instead - */ -#ifdef __BUILD_WITH_EXAMPLE__ -#include "lpc17xx_libcfg.h" -#else -#include "lpc17xx_libcfg_default.h" -#endif /* __BUILD_WITH_EXAMPLE__ */ - - -#ifdef _SYSTICK - -/* Public Functions ----------------------------------------------------------- */ -/** @addtogroup SYSTICK_Public_Functions - * @{ - */ -/*********************************************************************//** - * @brief Initial System Tick with using internal CPU clock source - * @param[in] time time interval(ms) - * @return None - **********************************************************************/ -void SYSTICK_InternalInit(uint32_t time) -{ - uint32_t cclk; - float maxtime; - - cclk = SystemCoreClock; - /* With internal CPU clock frequency for LPC17xx is 'SystemCoreClock' - * And limit 24 bit for RELOAD value - * So the maximum time can be set: - * 1/SystemCoreClock * (2^24) * 1000 (ms) - */ - //check time value is available or not - maxtime = (1<<24)/(SystemCoreClock / 1000) ; - if(time > maxtime) - //Error loop - while(1); - else - { - //Select CPU clock is System Tick clock source - SysTick->CTRL |= ST_CTRL_CLKSOURCE; - /* Set RELOAD value - * RELOAD = (SystemCoreClock/1000) * time - 1 - * with time base is millisecond - */ - SysTick->LOAD = (cclk/1000)*time - 1; - } -} - -/*********************************************************************//** - * @brief Initial System Tick with using external clock source - * @param[in] freq external clock frequency(Hz) - * @param[in] time time interval(ms) - * @return None - **********************************************************************/ -void SYSTICK_ExternalInit(uint32_t freq, uint32_t time) -{ - float maxtime; - - /* With external clock frequency for LPC17xx is 'freq' - * And limit 24 bit for RELOAD value - * So the maximum time can be set: - * 1/freq * (2^24) * 1000 (ms) - */ - //check time value is available or not - maxtime = (1<<24)/(freq / 1000) ; - if (time>maxtime) - //Error Loop - while(1); - else - { - //Select external clock is System Tick clock source - SysTick->CTRL &= ~ ST_CTRL_CLKSOURCE; - /* Set RELOAD value - * RELOAD = (freq/1000) * time - 1 - * with time base is millisecond - */ - maxtime = (freq/1000)*time - 1; - SysTick->LOAD = (freq/1000)*time - 1; - } -} - -/*********************************************************************//** - * @brief Enable/disable System Tick counter - * @param[in] NewState System Tick counter status, should be: - * - ENABLE - * - DISABLE - * @return None - **********************************************************************/ -void SYSTICK_Cmd(FunctionalState NewState) -{ - CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState)); - - if(NewState == ENABLE) - //Enable System Tick counter - SysTick->CTRL |= ST_CTRL_ENABLE; - else - //Disable System Tick counter - SysTick->CTRL &= ~ST_CTRL_ENABLE; -} - -/*********************************************************************//** - * @brief Enable/disable System Tick interrupt - * @param[in] NewState System Tick interrupt status, should be: - * - ENABLE - * - DISABLE - * @return None - **********************************************************************/ -void SYSTICK_IntCmd(FunctionalState NewState) -{ - CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState)); - - if(NewState == ENABLE) - //Enable System Tick counter - SysTick->CTRL |= ST_CTRL_TICKINT; - else - //Disable System Tick counter - SysTick->CTRL &= ~ST_CTRL_TICKINT; -} - -/*********************************************************************//** - * @brief Get current value of System Tick counter - * @param[in] None - * @return current value of System Tick counter - **********************************************************************/ -uint32_t SYSTICK_GetCurrentValue(void) -{ - return (SysTick->VAL); -} - -/*********************************************************************//** - * @brief Clear Counter flag - * @param[in] None - * @return None - **********************************************************************/ -void SYSTICK_ClearCounterFlag(void) -{ - SysTick->CTRL &= ~ST_CTRL_COUNTFLAG; -} -/** - * @} - */ - -#endif /* _SYSTICK */ - -/** - * @} - */ - -/* --------------------------------- End Of File ------------------------------ */ - -#endif /* __LPC17XX__ */