LPC1700CMSIS Standard Peripheral Firmware Library: C:/nxpdrv/LPC1700CMSIS/Drivers/source/lpc17xx_wdt.c Source File

LPC1700CMSIS

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C:/nxpdrv/LPC1700CMSIS/Drivers/source/lpc17xx_wdt.c

00001 
00020 /* Peripheral group ----------------------------------------------------------- */
00025 /* Includes ------------------------------------------------------------------- */
00026 #include "lpc17xx_wdt.h"
00027 #include "lpc17xx_clkpwr.h"
00028 #include "lpc17xx_pinsel.h"
00029 
00030 
00031 /* If this source file built with example, the LPC17xx FW library configuration
00032  * file in each example directory ("lpc17xx_libcfg.h") must be included,
00033  * otherwise the default FW library configuration file must be included instead
00034  */
00035 #ifdef __BUILD_WITH_EXAMPLE__
00036 #include "lpc17xx_libcfg.h"
00037 #else
00038 #include "lpc17xx_libcfg_default.h"
00039 #endif /* __BUILD_WITH_EXAMPLE__ */
00040 
00041 
00042 #ifdef _WDT
00043 
00044 /* Private Functions ---------------------------------------------------------- */
00049 /********************************************************************/
00055 uint8_t WDT_SetTimeOut (uint8_t clk_source, uint32_t timeout)
00056 {
00057 
00058         uint32_t pclk_wdt = 0;
00059         uint32_t tempval = 0;
00060 
00061         switch ((WDT_CLK_OPT) clk_source)
00062     {
00063     case WDT_CLKSRC_IRC:
00064         pclk_wdt = 4000000;
00065         // Calculate TC in WDT
00066         tempval  = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
00067         // Check if it valid
00068         if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
00069         {
00070                 LPC_WDT->WDTC = tempval;
00071                 return  SUCCESS;
00072         }
00073 
00074         break;
00075 
00076     case WDT_CLKSRC_PCLK:
00077 
00078         // Get WDT clock with CCLK divider = 4
00079                 pclk_wdt = SystemCoreClock / 4;
00080                 // Calculate TC in WDT
00081                 tempval  = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
00082 
00083                 if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
00084                 {
00085                         CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_4);
00086                         LPC_WDT->WDTC = (uint32_t) tempval;
00087                         return SUCCESS;
00088                 }
00089 
00090                 // Get WDT clock with CCLK divider = 2
00091                 pclk_wdt = SystemCoreClock / 2;
00092                 // Calculate TC in WDT
00093                 tempval  = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
00094 
00095                 if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
00096                 {
00097                         CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_2);
00098                         LPC_WDT->WDTC = (uint32_t) tempval;
00099                         return  SUCCESS;
00100                 }
00101 
00102                 // Get WDT clock with CCLK divider = 1
00103                 pclk_wdt = SystemCoreClock;
00104                 // Calculate TC in WDT
00105                 tempval  = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
00106 
00107                 if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
00108                 {
00109                         CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_1);
00110                         LPC_WDT->WDTC = (uint32_t) tempval;
00111                         return  SUCCESS;
00112                 }
00113                 break ;
00114 
00115 
00116     case WDT_CLKSRC_RTC:
00117                 pclk_wdt = 32768;
00118                 // Calculate TC in WDT
00119                 tempval  = (((pclk_wdt) / WDT_US_INDEX) * (timeout / 4));
00120                 // Check if it valid
00121                 if ((tempval >= WDT_TIMEOUT_MIN) && (tempval <= WDT_TIMEOUT_MAX))
00122                 {
00123                         LPC_WDT->WDTC = (uint32_t) tempval;
00124                         return  SUCCESS;
00125                 }
00126 
00127                 break;
00128 
00129 // Error parameter
00130                 default:
00131                         break;
00132 }
00133 
00134         return ERROR;
00135 }
00136 
00142 /* Public Functions ----------------------------------------------------------- */
00148 /*********************************************************************/
00162 void WDT_Init (uint32_t ClkSrc, uint32_t WDTMode)
00163 {
00164         CHECK_PARAM(PARAM_WDT_CLK_OPT(ClkSrc));
00165         CHECK_PARAM(PARAM_WDT_MODE_OPT(WDTMode));
00166         CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_WDT, CLKPWR_PCLKSEL_CCLK_DIV_4);
00167 
00168         //Set clock source
00169         LPC_WDT->WDCLKSEL &= ~WDT_WDCLKSEL_MASK;
00170         LPC_WDT->WDCLKSEL |= ClkSrc;
00171         //Set WDT mode
00172         if (WDTMode == WDT_MODE_RESET){
00173                 LPC_WDT->WDMOD |= WDT_WDMOD(WDTMode);
00174         }
00175 }
00176 
00177 /*********************************************************************/
00182 void WDT_Start(uint32_t TimeOut)
00183 {
00184         uint32_t ClkSrc;
00185 
00186         ClkSrc = LPC_WDT->WDCLKSEL;
00187         ClkSrc &=WDT_WDCLKSEL_MASK;
00188         WDT_SetTimeOut(ClkSrc,TimeOut);
00189         //enable watchdog
00190         LPC_WDT->WDMOD |= WDT_WDMOD_WDEN;
00191         WDT_Feed();
00192 }
00193 
00194 /********************************************************************/
00199 FlagStatus WDT_ReadTimeOutFlag (void)
00200 {
00201         return ((LPC_WDT->WDMOD & WDT_WDMOD_WDTOF) >>2);
00202 }
00203 
00204 /********************************************************************/
00209 void WDT_ClrTimeOutFlag (void)
00210 {
00211         LPC_WDT->WDMOD &=~WDT_WDMOD_WDTOF;
00212 }
00213 
00214 /********************************************************************/
00219 void WDT_UpdateTimeOut ( uint32_t TimeOut)
00220 {
00221         uint32_t ClkSrc;
00222         ClkSrc = LPC_WDT->WDCLKSEL;
00223         ClkSrc &=WDT_WDCLKSEL_MASK;
00224         WDT_SetTimeOut(ClkSrc,TimeOut);
00225         WDT_Feed();
00226 }
00227 
00228 
00229 /********************************************************************/
00236 void WDT_Feed (void)
00237 {
00238         // Disable irq interrupt
00239         __disable_irq();
00240         LPC_WDT->WDFEED = 0xAA;
00241         LPC_WDT->WDFEED = 0x55;
00242         // Then enable irq interrupt
00243         __enable_irq();
00244 }
00245 
00246 /********************************************************************/
00251 uint32_t WDT_GetCurrentCount(void)
00252 {
00253         return LPC_WDT->WDTV;
00254 }
00255 
00260 #endif /* _WDT */
00261 
00266 /* --------------------------------- End Of File ------------------------------ */
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