275 lines
8.7 KiB
C
275 lines
8.7 KiB
C
/**********************************************************************
|
|
* $Id$ lpc17xx_wdt.c 2010-05-21
|
|
*//**
|
|
* @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
|
|
*
|
|
* Copyright(C) 2010, NXP Semiconductor
|
|
* All rights reserved.
|
|
*
|
|
***********************************************************************
|
|
* 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.
|
|
* Permission to use, copy, modify, and distribute this software and its
|
|
* documentation is hereby granted, under NXP Semiconductors'
|
|
* relevant copyright 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.
|
|
**********************************************************************/
|
|
|
|
/* 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 = ((((uint64_t)pclk_wdt * (uint64_t)timeout / 4) / (uint64_t)WDT_US_INDEX));
|
|
// Check if it valid
|
|
if (tempval >= WDT_TIMEOUT_MIN)
|
|
{
|
|
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 = ((((uint64_t)pclk_wdt * (uint64_t)timeout / 4) / (uint64_t)WDT_US_INDEX));
|
|
|
|
if (tempval >= WDT_TIMEOUT_MIN)
|
|
{
|
|
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 = ((((uint64_t)pclk_wdt * (uint64_t)timeout / 4) / (uint64_t)WDT_US_INDEX));
|
|
|
|
if (tempval >= WDT_TIMEOUT_MIN)
|
|
{
|
|
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 = ((((uint64_t)pclk_wdt * (uint64_t)timeout / 4) / (uint64_t)WDT_US_INDEX));
|
|
|
|
if (tempval >= WDT_TIMEOUT_MIN)
|
|
{
|
|
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 = ((((uint64_t)pclk_wdt * (uint64_t)timeout / 4) / (uint64_t)WDT_US_INDEX));
|
|
// Check if it valid
|
|
if (tempval >= WDT_TIMEOUT_MIN)
|
|
{
|
|
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 ------------------------------ */
|