diff options
Diffstat (limited to 'arch/arm/lpc17xx/Drivers/source/lpc17xx_wdt.c')
| -rw-r--r-- | arch/arm/lpc17xx/Drivers/source/lpc17xx_wdt.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/arch/arm/lpc17xx/Drivers/source/lpc17xx_wdt.c b/arch/arm/lpc17xx/Drivers/source/lpc17xx_wdt.c new file mode 100644 index 0000000..1d8b407 --- /dev/null +++ b/arch/arm/lpc17xx/Drivers/source/lpc17xx_wdt.c @@ -0,0 +1,261 @@ +/***********************************************************************//**
+ * @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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