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