82 lines
3.1 KiB
C
82 lines
3.1 KiB
C
/*
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* @brief LPC8xx Self Wakeup Timer (WKT) chip driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2012
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "chip.h"
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Set clock source for WKT */
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void Chip_WKT_SetClockSource(LPC_WKT_T *pWKT, WKT_CLKSRC_T clkSrc)
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{
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if (clkSrc == WKT_CLKSRC_10KHZ) {
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pWKT->CTRL |= WKT_CTRL_CLKSEL; /* using Low Power clock 10kHz */
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}
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else {
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pWKT->CTRL &= ~WKT_CTRL_CLKSEL; /* using Divided IRC clock 750kHz */
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}
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}
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/* Return approximate rate for the selected clock source */
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uint32_t Chip_WKT_GetClockRate(LPC_WKT_T *pWKT)
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{
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if (Chip_WKT_GetClockSource(pWKT) == WKT_CLKSRC_DIVIRC) {
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/* Approximately 750KHz */
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return (750 * 1000);
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}
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else {
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/* Approximately 10KHz */
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return (10 * 1000);
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}
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}
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/* Start wake-up timer interrupt, set clock source, set timer interval */
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void Chip_WKT_Start(LPC_WKT_T *pWKT, WKT_CLKSRC_T clkSrc, uint32_t cntVal)
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{
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/* Set the WKT clock source */
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Chip_WKT_SetClockSource(pWKT, (WKT_CLKSRC_T) clkSrc);
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/* Set the WKT counter & start it */
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pWKT->COUNT = cntVal;
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}
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