LPC1768 and LPC11U24 watchdog timer
Dependents: GSwifi_tsutenkaku barometer-m0 BMAGThrRev
WDT.cpp
- Committer:
- okini3939
- Date:
- 2014-07-11
- Revision:
- 2:f6f05e2eafd0
- Parent:
- 1:f7baa89f84bc
- Child:
- 3:b1efde09d8a7
File content as of revision 2:f6f05e2eafd0:
#include "mbed.h" #include "WDT.h" FunctionPointer Watchdog::_fptr; // Simon's Watchdog // see: http://mbed.org/forum/mbed/topic/508/ void Watchdog::init(float s) { #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) LPC_WDT->WDCLKSEL = 0x01; // Set CLK src to PCLK uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4 LPC_WDT->WDTC = s * (float)clk; LPC_WDT->WDMOD = 0x03; // Enabled and Reset #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) LPC_WWDT->CLKSEL = 0x01; // Set CLK src to PCLK uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4 LPC_WWDT->TC = s * (float)clk; LPC_WWDT->MOD = 0x03; // Enabled and Reset #endif kick(); } // "kick" or "feed" the dog - reset the watchdog timer // by writing this required bit pattern void Watchdog::kick() { __disable_irq(); #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) LPC_WDT->WDFEED = 0xAA; LPC_WDT->WDFEED = 0x55; #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) LPC_WWDT->FEED = 0xAA; LPC_WWDT->FEED = 0x55; #endif __enable_irq(); } int Watchdog::getFlg () { #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) return LPC_WDT->WDMOD & (1<<2) ? 1 : 0; #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) return LPC_WWDT->MOD & (1<<2) ? 1 : 0; #endif } void Watchdog::attach (void (*fptr)(void), float s) { if (fptr) { _fptr.attach(fptr); } #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) LPC_WDT->WDCLKSEL = 0x02; // Set CLK src to RTC uint32_t clk = 32768 / 4; // WD has a fixed /4 prescaler LPC_WDT->WDTC = s * (float)clk; LPC_WDT->WDMOD = 0x01; // Enabled but Reset disable #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15); LPC_SYSCON->PDRUNCFG &= ~(1<<6); // WDT on LPC_SYSCON->WDTOSCCTRL = (1<<5)|(0x1f<<0); // 500kHz / 64 LPC_WWDT->CLKSEL = (1<<0); // Set CLK src to PCLK uint32_t clk = 500000 / 64 / 4; // WD has a fixed /4 prescaler, PCLK default is /4 LPC_WWDT->TC = s * (float)clk; LPC_WWDT->WARNINT = 0; LPC_WWDT->MOD = 0x01; // Enabled but Reset disable kick(); LPC_SYSCON->STARTERP1 |= (1<<12); #endif NVIC_SetVector(WDT_IRQn, (uint32_t)&Watchdog::isr_wdt); NVIC_ClearPendingIRQ(WDT_IRQn); NVIC_EnableIRQ(WDT_IRQn); } template<typename T> void Watchdog::attach (T *object, void (*fptr)(void), float s) { if (fptr) { _fptr.attach(object, fptr); } attach(NULL, s); } void Watchdog::isr_wdt(void) { #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) LPC_WDT->WDMOD |= (1<<3); LPC_WDT->WDMOD &= ~(1<<2); #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) LPC_WWDT->MOD |= (1<<3); LPC_WWDT->MOD &= ~(1<<2); #endif _fptr.call(); } void Watchdog::sleep () { #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) LPC_SC->PCON = 0; #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) LPC_PMU->PCON = 0; #endif SCB->SCR &= ~(1<<2); __WFI(); } void Watchdog::deepSleep () { #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) LPC_SC->PCON &= ~(7<<0); LPC_SC->PCON |= (1<<0); #elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11UXX) LPC_SYSCON->PDSLEEPCFG &= ~(1<<6); // WDT on LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG; LPC_PMU->PCON &= ~(7<<0); LPC_PMU->PCON |= (1<<0); #endif SCB->SCR |= (1<<2); __WFI(); }