From e4e7b661172477aaa682a9cccfbac89adb1d01f6 Mon Sep 17 00:00:00 2001 From: Pixel Date: Sun, 23 Jan 2011 12:15:41 -0800 Subject: Adding basic CMSIS source code; v1.3.0 from the NXP website currently. --- arch/arm/lpc17xx/Drivers/source/lpc17xx_systick.c | 180 ++++++++++++++++++++++ 1 file changed, 180 insertions(+) create mode 100644 arch/arm/lpc17xx/Drivers/source/lpc17xx_systick.c (limited to 'arch/arm/lpc17xx/Drivers/source/lpc17xx_systick.c') diff --git a/arch/arm/lpc17xx/Drivers/source/lpc17xx_systick.c b/arch/arm/lpc17xx/Drivers/source/lpc17xx_systick.c new file mode 100644 index 0000000..5112679 --- /dev/null +++ b/arch/arm/lpc17xx/Drivers/source/lpc17xx_systick.c @@ -0,0 +1,180 @@ +/***********************************************************************//** + * @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 + ************************************************************************** + * 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->RELOAD = (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->RELOAD = (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->CURR); +} + +/*********************************************************************//** + * @brief Clear Counter flag + * @param[in] None + * @return None + **********************************************************************/ +void SYSTICK_ClearCounterFlag(void) +{ + SysTick->CTRL &= ~ST_CTRL_COUNTFLAG; +} +/** + * @} + */ + +#endif /* _SYSTICK */ + +/** + * @} + */ + +/* --------------------------------- End Of File ------------------------------ */ + -- cgit v1.2.3