Christian Lerche / WatchDog

WatchDog Timer library, support for LPC1768 and LPC11U24

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Fork of WatchDog by Christian Lerche

WatchDog.cpp@0:bbc789f8d849, 2012-07-01 (annotated)

Committer:
Lerche
Date:
Sun Jul 01 22:43:25 2012 +0000
Revision:
0:bbc789f8d849
Child:
2:a6661a79bf7b
Added support for LPC11U24.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Lerche 0:bbc789f8d849 1 /*
Lerche 0:bbc789f8d849 2 * Source code is free to use and distribute.
Lerche 0:bbc789f8d849 3 * Software originally written by Simon Ford,
Lerche 0:bbc789f8d849 4 * altered by Lerche.
Lerche 0:bbc789f8d849 5 *
Lerche 0:bbc789f8d849 6 * 02-07-2012 - Added LPC11U24 Watchdog functions. Lerche
Lerche 0:bbc789f8d849 7 *
Lerche 0:bbc789f8d849 8 */
Lerche 0:bbc789f8d849 9
Lerche 0:bbc789f8d849 10 #include "mbed.h"
Lerche 0:bbc789f8d849 11 #include "WatchDog.h"
Lerche 0:bbc789f8d849 12
Lerche 0:bbc789f8d849 13
Lerche 0:bbc789f8d849 14 WatchDog::WatchDog(float s) {
Lerche 0:bbc789f8d849 15 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
Lerche 0:bbc789f8d849 16 LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
Lerche 0:bbc789f8d849 17 uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
Lerche 0:bbc789f8d849 18 LPC_WDT->WDTC = s * (float)clk; // Load WD Timer Constant with value determined by float s
Lerche 0:bbc789f8d849 19 LPC_WDT->WDMOD = 0x3; // Enabled and Reset
Lerche 0:bbc789f8d849 20 feed();
Lerche 0:bbc789f8d849 21 #elif defined(TARGET_LPC11U24)
Lerche 0:bbc789f8d849 22 LPC_SYSCON->SYSAHBCLKCTRL |= 0x8000;
Lerche 0:bbc789f8d849 23 LPC_SYSCON->PDRUNCFG &= 0xFFBF;
Lerche 0:bbc789f8d849 24 LPC_SYSCON->WDTOSCCTRL = 0x40;
Lerche 0:bbc789f8d849 25 uint32_t clk = 100000;
Lerche 0:bbc789f8d849 26 LPC_WWDT->TC = s * (float)clk;
Lerche 0:bbc789f8d849 27 LPC_WWDT->CLKSEL = 0x1;
Lerche 0:bbc789f8d849 28 LPC_WWDT->MOD = 0x3;
Lerche 0:bbc789f8d849 29 feed();
Lerche 0:bbc789f8d849 30 #endif
Lerche 0:bbc789f8d849 31 }
Lerche 0:bbc789f8d849 32
Lerche 0:bbc789f8d849 33 WatchDog_ms::WatchDog_ms(int ms) {
Lerche 0:bbc789f8d849 34 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
Lerche 0:bbc789f8d849 35 LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
Lerche 0:bbc789f8d849 36 uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
Lerche 0:bbc789f8d849 37 LPC_WDT->WDTC = ((float)ms * (float)clk) /1000; // Load WD Timer Constant with value determined by int ms
Lerche 0:bbc789f8d849 38 LPC_WDT->WDMOD = 0x3; // Enabled and Reset
Lerche 0:bbc789f8d849 39 feed();
Lerche 0:bbc789f8d849 40 #elif defined(TARGET_LPC11U24)
Lerche 0:bbc789f8d849 41 LPC_SYSCON->SYSAHBCLKCTRL |= 0x8000;
Lerche 0:bbc789f8d849 42 LPC_SYSCON->PDRUNCFG &= 0xFFBF;
Lerche 0:bbc789f8d849 43 LPC_SYSCON->WDTOSCCTRL = 0x40;
Lerche 0:bbc789f8d849 44 uint32_t clk = 100000;
Lerche 0:bbc789f8d849 45 LPC_WWDT->TC = ((float)ms * (float)clk) / 1000;
Lerche 0:bbc789f8d849 46 LPC_WWDT->CLKSEL = 0x1;
Lerche 0:bbc789f8d849 47 LPC_WWDT->MOD = 0x3;
Lerche 0:bbc789f8d849 48 feed();
Lerche 0:bbc789f8d849 49 #endif
Lerche 0:bbc789f8d849 50 }
Lerche 0:bbc789f8d849 51
Lerche 0:bbc789f8d849 52 WatchDog_us::WatchDog_us(int us) {
Lerche 0:bbc789f8d849 53 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
Lerche 0:bbc789f8d849 54 LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
Lerche 0:bbc789f8d849 55 uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
Lerche 0:bbc789f8d849 56 LPC_WDT->WDTC = ((float)us * (float)clk) /1000000; // Load WD Timer Constant with value determined by int us
Lerche 0:bbc789f8d849 57 LPC_WDT->WDMOD = 0x3; // Enabled and Reset
Lerche 0:bbc789f8d849 58 feed();
Lerche 0:bbc789f8d849 59 #elif defined(TARGET_LPC11U24)
Lerche 0:bbc789f8d849 60 LPC_SYSCON->SYSAHBCLKCTRL |= 0x8000;
Lerche 0:bbc789f8d849 61 LPC_SYSCON->PDRUNCFG &= 0xFFBF;
Lerche 0:bbc789f8d849 62 LPC_SYSCON->WDTOSCCTRL = 0x40;
Lerche 0:bbc789f8d849 63 uint32_t clk = 100000;
Lerche 0:bbc789f8d849 64 LPC_WWDT->TC = ((float)us * (float)clk) / 1000000;
Lerche 0:bbc789f8d849 65 LPC_WWDT->CLKSEL = 0x1;
Lerche 0:bbc789f8d849 66 LPC_WWDT->MOD = 0x3;
Lerche 0:bbc789f8d849 67 feed();
Lerche 0:bbc789f8d849 68 #endif
Lerche 0:bbc789f8d849 69 }
Lerche 0:bbc789f8d849 70
Lerche 0:bbc789f8d849 71 void WatchDog::feed() {
Lerche 0:bbc789f8d849 72 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
Lerche 0:bbc789f8d849 73 LPC_WDT->WDFEED = 0xAA; // Routine to feed the WatchDog
Lerche 0:bbc789f8d849 74 LPC_WDT->WDFEED = 0x55; // according to user manual
Lerche 0:bbc789f8d849 75 #elif defined(TARGET_LPC11U24)
Lerche 0:bbc789f8d849 76 LPC_WWDT->FEED = 0xAA;
Lerche 0:bbc789f8d849 77 LPC_WWDT->FEED = 0x55;
Lerche 0:bbc789f8d849 78 #endif
Lerche 0:bbc789f8d849 79 }
Lerche 0:bbc789f8d849 80 void WatchDog_ms::feed() {
Lerche 0:bbc789f8d849 81 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
Lerche 0:bbc789f8d849 82 LPC_WDT->WDFEED = 0xAA; // Routine to feed the WatchDog
Lerche 0:bbc789f8d849 83 LPC_WDT->WDFEED = 0x55; // according to user manual
Lerche 0:bbc789f8d849 84 #elif defined(TARGET_LPC11U24)
Lerche 0:bbc789f8d849 85 LPC_WWDT->FEED = 0xAA;
Lerche 0:bbc789f8d849 86 LPC_WWDT->FEED = 0x55;
Lerche 0:bbc789f8d849 87 #endif
Lerche 0:bbc789f8d849 88 }
Lerche 0:bbc789f8d849 89 void WatchDog_us::feed() {
Lerche 0:bbc789f8d849 90 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
Lerche 0:bbc789f8d849 91 LPC_WDT->WDFEED = 0xAA; // Routine to feed the WatchDog
Lerche 0:bbc789f8d849 92 LPC_WDT->WDFEED = 0x55; // according to user manual
Lerche 0:bbc789f8d849 93 #elif defined(TARGET_LPC11U24)
Lerche 0:bbc789f8d849 94 LPC_WWDT->FEED = 0xAA;
Lerche 0:bbc789f8d849 95 LPC_WWDT->FEED = 0x55;
Lerche 0:bbc789f8d849 96 #endif
Lerche 0:bbc789f8d849 97 }