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/**
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* @file : lpc17xx_wdt.c
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* @brief : Contains all functions support for WDT firmware library on LPC17xx
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* @version : 1.0
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* @date : 9. April. 2009
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* @author : HieuNguyen
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**************************************************************************
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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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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup WDT
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "lpc17xx_wdt.h"
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#include "lpc17xx_clkpwr.h"
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#include "lpc17xx_pinsel.h"
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/* If this source file built with example, the LPC17xx FW library configuration
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* file in each example directory ("lpc17xx_libcfg.h") must be included,
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* otherwise the default FW library configuration file must be included instead
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc17xx_libcfg.h"
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#else
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#include "lpc17xx_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _WDT
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/* Private Functions ---------------------------------------------------------- */
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/** @defgroup WDT_Private_Functions
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* @{
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*/
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/********************************************************************//**
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* @brief Set WDT time out value and WDT mode
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* @param[in] clk_source select Clock source for WDT device
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* @param[in] timeout value of time-out for WDT (us)
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* @return None
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*********************************************************************/
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uint8_t WDT_SetTimeOut (uint8_t clk_source, uint32_t timeout)
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{
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uint32_t pclk_wdt = 0;
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uint32_t tempval = 0;
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switch ((WDT_CLK_OPT) clk_source)
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{
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case WDT_CLKSRC_IRC:
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pclk_wdt = 4000000;
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// Calculate TC in WDT
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tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
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// Check if it valid
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if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
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{
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LPC_WDT->WDTC = tempval;
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return SUCCESS;
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}
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break;
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case WDT_CLKSRC_PCLK:
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// Get WDT clock with CCLK divider = 4
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pclk_wdt = SystemCoreClock / 4;
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// Calculate TC in WDT
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tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
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if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
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{
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CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_4);
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LPC_WDT->WDTC = (uint32_t) tempval;
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return SUCCESS;
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}
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// Get WDT clock with CCLK divider = 2
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pclk_wdt = SystemCoreClock / 2;
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// Calculate TC in WDT
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tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
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if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
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{
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CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_2);
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LPC_WDT->WDTC = (uint32_t) tempval;
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return SUCCESS;
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}
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// Get WDT clock with CCLK divider = 1
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pclk_wdt = SystemCoreClock;
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// Calculate TC in WDT
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tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
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if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
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{
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CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_1);
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LPC_WDT->WDTC = (uint32_t) tempval;
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return SUCCESS;
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}
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break ;
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case WDT_CLKSRC_RTC:
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pclk_wdt = 32768;
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// Calculate TC in WDT
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tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
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// Check if it valid
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if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
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{
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LPC_WDT->WDTC = (uint32_t) tempval;
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return SUCCESS;
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}
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break;
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// Error parameter
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default:
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break;
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}
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return ERROR;
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}
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/**
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* @}
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*/
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup WDT_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Initial for Watchdog function
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* Clock source = RTC ,
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*
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* @param[in] ClkSrc Select clock source
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* - 0:Clock source from Internal RC oscillator
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* - 1: Selects the APB peripheral clock (PCLK)
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* - 2:Selects the RTC oscillator
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*
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* @param[in] WDTMode WDT mode
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* - 0: Use WDT to generate interrupt only
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* - 1:WDT_MODE_RESET
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* @return None
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**********************************************************************/
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void WDT_Init (uint32_t ClkSrc, uint32_t WDTMode)
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{
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CHECK_PARAM(PARAM_WDT_CLK_OPT(ClkSrc));
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CHECK_PARAM(PARAM_WDT_MODE_OPT(WDTMode));
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CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_4);
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//Set clock source
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LPC_WDT->WDCLKSEL &= ~WDT_WDCLKSEL_MASK;
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LPC_WDT->WDCLKSEL |= ClkSrc;
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//Set WDT mode
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if (WDTMode == WDT_MODE_RESET){
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LPC_WDT->WDMOD |= WDT_WDMOD(WDTMode);
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}
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}
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/*********************************************************************//**
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* @brief Start WDT activity with given timeout value
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* @param[in] TimeOut WDT reset after timeout if it is not feed
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* @return None
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**********************************************************************/
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void WDT_Start(uint32_t TimeOut)
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{
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uint32_t ClkSrc;
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ClkSrc = LPC_WDT->WDCLKSEL;
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ClkSrc &=WDT_WDCLKSEL_MASK;
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WDT_SetTimeOut(ClkSrc,TimeOut);
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//enable watchdog
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LPC_WDT->WDMOD |= WDT_WDMOD_WDEN;
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WDT_Feed();
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}
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/********************************************************************//**
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* @brief Read WDT Time out flag
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* @param[in] None
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* @return Time out flag status of WDT
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*********************************************************************/
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FlagStatus WDT_ReadTimeOutFlag (void)
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{
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return ((LPC_WDT->WDMOD & WDT_WDMOD_WDTOF) >>2);
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}
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/********************************************************************//**
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* @brief Clear WDT Time out flag
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* @param[in] None
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* @return None
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*********************************************************************/
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void WDT_ClrTimeOutFlag (void)
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{
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LPC_WDT->WDMOD &=~WDT_WDMOD_WDTOF;
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}
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/********************************************************************//**
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* @brief Update WDT timeout value and feed
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* @param[in] TimeOut TimeOut value to be updated
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* @return None
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*********************************************************************/
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void WDT_UpdateTimeOut ( uint32_t TimeOut)
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{
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uint32_t ClkSrc;
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ClkSrc = LPC_WDT->WDCLKSEL;
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ClkSrc &=WDT_WDCLKSEL_MASK;
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WDT_SetTimeOut(ClkSrc,TimeOut);
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WDT_Feed();
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}
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/********************************************************************//**
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* @brief After set WDTEN, call this function to start Watchdog
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* or reload the Watchdog timer
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* @param[in] None
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*
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* @return None
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*********************************************************************/
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void WDT_Feed (void)
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{
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// Disable irq interrupt
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__disable_irq();
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LPC_WDT->WDFEED = 0xAA;
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LPC_WDT->WDFEED = 0x55;
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// Then enable irq interrupt
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__enable_irq();
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}
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/********************************************************************//**
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* @brief Get the current value of WDT
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* @param[in] None
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* @return current value of WDT
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*********************************************************************/
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uint32_t WDT_GetCurrentCount(void)
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{
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return LPC_WDT->WDTV;
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}
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/**
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* @}
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*/
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#endif /* _WDT */
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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