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/***********************************************************************//**
* @file lpc17xx_wdt.c
* @brief Contains all functions support for WDT 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 WDT
* @{
*/
/* Includes ------------------------------------------------------------------- */
#include "lpc17xx_wdt.h"
#include "lpc17xx_clkpwr.h"
#include "lpc17xx_pinsel.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 _WDT
/* Private Functions ---------------------------------------------------------- */
static uint8_t WDT_SetTimeOut (uint8_t clk_source, uint32_t timeout);
/********************************************************************//**
* @brief Set WDT time out value and WDT mode
* @param[in] clk_source select Clock source for WDT device
* @param[in] timeout value of time-out for WDT (us)
* @return None
*********************************************************************/
static uint8_t WDT_SetTimeOut (uint8_t clk_source, uint32_t timeout)
{
uint32_t pclk_wdt = 0;
uint32_t tempval = 0;
switch ((WDT_CLK_OPT) clk_source)
{
case WDT_CLKSRC_IRC:
pclk_wdt = 4000000;
// Calculate TC in WDT
tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
// Check if it valid
if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
{
LPC_WDT->WDTC = tempval;
return SUCCESS;
}
break;
case WDT_CLKSRC_PCLK:
// Get WDT clock with CCLK divider = 4
pclk_wdt = SystemCoreClock / 4;
// Calculate TC in WDT
tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
{
CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_4);
LPC_WDT->WDTC = (uint32_t) tempval;
return SUCCESS;
}
// Get WDT clock with CCLK divider = 2
pclk_wdt = SystemCoreClock / 2;
// Calculate TC in WDT
tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
{
CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_2);
LPC_WDT->WDTC = (uint32_t) tempval;
return SUCCESS;
}
// Get WDT clock with CCLK divider = 1
pclk_wdt = SystemCoreClock;
// Calculate TC in WDT
tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
{
CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_1);
LPC_WDT->WDTC = (uint32_t) tempval;
return SUCCESS;
}
break ;
case WDT_CLKSRC_RTC:
pclk_wdt = 32768;
// Calculate TC in WDT
tempval = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
// Check if it valid
if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
{
LPC_WDT->WDTC = (uint32_t) tempval;
return SUCCESS;
}
break;
// Error parameter
default:
break;
}
return ERROR;
}
/* End of Private Functions --------------------------------------------------- */
/* Public Functions ----------------------------------------------------------- */
/** @addtogroup WDT_Public_Functions
* @{
*/
/*********************************************************************//**
* @brief Initial for Watchdog function
* Clock source = RTC ,
* @param[in] ClkSrc Select clock source, should be:
* - WDT_CLKSRC_IRC: Clock source from Internal RC oscillator
* - WDT_CLKSRC_PCLK: Selects the APB peripheral clock (PCLK)
* - WDT_CLKSRC_RTC: Selects the RTC oscillator
* @param[in] WDTMode WDT mode, should be:
* - WDT_MODE_INT_ONLY: Use WDT to generate interrupt only
* - WDT_MODE_RESET: Use WDT to generate interrupt and reset MCU
* @return None
**********************************************************************/
void WDT_Init (WDT_CLK_OPT ClkSrc, WDT_MODE_OPT WDTMode)
{
CHECK_PARAM(PARAM_WDT_CLK_OPT(ClkSrc));
CHECK_PARAM(PARAM_WDT_MODE_OPT(WDTMode));
CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_4);
//Set clock source
LPC_WDT->WDCLKSEL &= ~WDT_WDCLKSEL_MASK;
LPC_WDT->WDCLKSEL |= ClkSrc;
//Set WDT mode
if (WDTMode == WDT_MODE_RESET){
LPC_WDT->WDMOD |= WDT_WDMOD(WDTMode);
}
}
/*********************************************************************//**
* @brief Start WDT activity with given timeout value
* @param[in] TimeOut WDT reset after timeout if it is not feed
* @return None
**********************************************************************/
void WDT_Start(uint32_t TimeOut)
{
uint32_t ClkSrc;
ClkSrc = LPC_WDT->WDCLKSEL;
ClkSrc &=WDT_WDCLKSEL_MASK;
WDT_SetTimeOut(ClkSrc,TimeOut);
//enable watchdog
LPC_WDT->WDMOD |= WDT_WDMOD_WDEN;
WDT_Feed();
}
/********************************************************************//**
* @brief Read WDT Time out flag
* @param[in] None
* @return Time out flag status of WDT
*********************************************************************/
FlagStatus WDT_ReadTimeOutFlag (void)
{
return ((FlagStatus)((LPC_WDT->WDMOD & WDT_WDMOD_WDTOF) >>2));
}
/********************************************************************//**
* @brief Clear WDT Time out flag
* @param[in] None
* @return None
*********************************************************************/
void WDT_ClrTimeOutFlag (void)
{
LPC_WDT->WDMOD &=~WDT_WDMOD_WDTOF;
}
/********************************************************************//**
* @brief Update WDT timeout value and feed
* @param[in] TimeOut TimeOut value to be updated
* @return None
*********************************************************************/
void WDT_UpdateTimeOut ( uint32_t TimeOut)
{
uint32_t ClkSrc;
ClkSrc = LPC_WDT->WDCLKSEL;
ClkSrc &=WDT_WDCLKSEL_MASK;
WDT_SetTimeOut(ClkSrc,TimeOut);
WDT_Feed();
}
/********************************************************************//**
* @brief After set WDTEN, call this function to start Watchdog
* or reload the Watchdog timer
* @param[in] None
*
* @return None
*********************************************************************/
void WDT_Feed (void)
{
// Disable irq interrupt
__disable_irq();
LPC_WDT->WDFEED = 0xAA;
LPC_WDT->WDFEED = 0x55;
// Then enable irq interrupt
__enable_irq();
}
/********************************************************************//**
* @brief Get the current value of WDT
* @param[in] None
* @return current value of WDT
*********************************************************************/
uint32_t WDT_GetCurrentCount(void)
{
return LPC_WDT->WDTV;
}
/**
* @}
*/
#endif /* _WDT */
/**
* @}
*/
/* --------------------------------- End Of File ------------------------------ */
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