Koos van der Wat
/
Watchdog
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Dependents: DewPoint_Sensor_NormalScreen DPTimer_NormalScreen_8R_DIP_4-20mA_Out
Watchdog.cpp@0:7a316f14da9c, 2011-03-20 (annotated)
- Committer:
- WiredHome
- Date:
- Sun Mar 20 23:22:50 2011 +0000
- Revision:
- 0:7a316f14da9c
- Child:
- 2:2873f068f325
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| WiredHome | 0:7a316f14da9c | 1 | |
| WiredHome | 0:7a316f14da9c | 2 | #include "mbed.h" |
| WiredHome | 0:7a316f14da9c | 3 | #include "Watchdog.h" |
| WiredHome | 0:7a316f14da9c | 4 | |
| WiredHome | 0:7a316f14da9c | 5 | |
| WiredHome | 0:7a316f14da9c | 6 | |
| WiredHome | 0:7a316f14da9c | 7 | /// Watchdog gets instantiated at the module level |
| WiredHome | 0:7a316f14da9c | 8 | Watchdog::Watchdog() { |
| WiredHome | 0:7a316f14da9c | 9 | wdreset = (LPC_WDT->WDMOD >> 2) & 1; |
| WiredHome | 0:7a316f14da9c | 10 | } |
| WiredHome | 0:7a316f14da9c | 11 | |
| WiredHome | 0:7a316f14da9c | 12 | /// Load timeout value in watchdog timer and enable |
| WiredHome | 0:7a316f14da9c | 13 | void Watchdog::Configure(float s) { |
| WiredHome | 0:7a316f14da9c | 14 | LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK |
| WiredHome | 0:7a316f14da9c | 15 | uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4 |
| WiredHome | 0:7a316f14da9c | 16 | LPC_WDT->WDTC = s * (float)clk; |
| WiredHome | 0:7a316f14da9c | 17 | LPC_WDT->WDMOD = 0x3; // Enabled and Reset |
| WiredHome | 0:7a316f14da9c | 18 | Service(); |
| WiredHome | 0:7a316f14da9c | 19 | } |
| WiredHome | 0:7a316f14da9c | 20 | |
| WiredHome | 0:7a316f14da9c | 21 | /// "Service", "kick" or "feed" the dog - reset the watchdog timer |
| WiredHome | 0:7a316f14da9c | 22 | /// by writing this required bit pattern |
| WiredHome | 0:7a316f14da9c | 23 | void Watchdog::Service() { |
| WiredHome | 0:7a316f14da9c | 24 | LPC_WDT->WDFEED = 0xAA; |
| WiredHome | 0:7a316f14da9c | 25 | LPC_WDT->WDFEED = 0x55; |
| WiredHome | 0:7a316f14da9c | 26 | } |
| WiredHome | 0:7a316f14da9c | 27 | |
| WiredHome | 0:7a316f14da9c | 28 | /// get the flag to indicate if the watchdog causes the reset |
| WiredHome | 0:7a316f14da9c | 29 | bool Watchdog::WatchdogCausedReset() { |
| WiredHome | 0:7a316f14da9c | 30 | return wdreset; |
| WiredHome | 0:7a316f14da9c | 31 | } |
| WiredHome | 0:7a316f14da9c | 32 | |
| WiredHome | 0:7a316f14da9c | 33 |