n r
Interface exposing basic LPC1768 watchdog timer functionality.
WatchdogTimer.cpp@0:f39b85bbe46f, 2012-09-02 (annotated)
- Committer:
- nr
- Date:
- Sun Sep 02 14:54:58 2012 +0000
- Revision:
- 0:f39b85bbe46f
Initial commit.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| nr | 0:f39b85bbe46f | 1 | #include "mbed.h" |
| nr | 0:f39b85bbe46f | 2 | #include "WatchdogTimer.h" |
| nr | 0:f39b85bbe46f | 3 | |
| nr | 0:f39b85bbe46f | 4 | WatchdogTimer::WatchdogTimer() |
| nr | 0:f39b85bbe46f | 5 | { |
| nr | 0:f39b85bbe46f | 6 | } |
| nr | 0:f39b85bbe46f | 7 | |
| nr | 0:f39b85bbe46f | 8 | void WatchdogTimer::enable(float timeout) |
| nr | 0:f39b85bbe46f | 9 | { |
| nr | 0:f39b85bbe46f | 10 | // Set the clock source (use peripheral clock) |
| nr | 0:f39b85bbe46f | 11 | LPC_WDT->WDCLKSEL = 0x1; |
| nr | 0:f39b85bbe46f | 12 | // Set the watchdog timer constant (watchdog prescaler is always 1/4, PCLK default is 1/4) |
| nr | 0:f39b85bbe46f | 13 | LPC_WDT->WDTC = timeout * SystemCoreClock / (4.0 * 4.0); |
| nr | 0:f39b85bbe46f | 14 | // Enable and reset (WDEN | WDRESET) |
| nr | 0:f39b85bbe46f | 15 | LPC_WDT->WDMOD = 0x3; |
| nr | 0:f39b85bbe46f | 16 | feed(); |
| nr | 0:f39b85bbe46f | 17 | } |
| nr | 0:f39b85bbe46f | 18 | |
| nr | 0:f39b85bbe46f | 19 | void WatchdogTimer::feed() |
| nr | 0:f39b85bbe46f | 20 | { |
| nr | 0:f39b85bbe46f | 21 | // Feed sequence is 0xAA, 0x55. |
| nr | 0:f39b85bbe46f | 22 | LPC_WDT->WDFEED = 0xAA; |
| nr | 0:f39b85bbe46f | 23 | LPC_WDT->WDFEED = 0x55; |
| nr | 0:f39b85bbe46f | 24 | } |
| nr | 0:f39b85bbe46f | 25 | |
| nr | 0:f39b85bbe46f | 26 | bool WatchdogTimer::causedReset() |
| nr | 0:f39b85bbe46f | 27 | { |
| nr | 0:f39b85bbe46f | 28 | // Read the watchdog time-out flag (WDTOF). |
| nr | 0:f39b85bbe46f | 29 | return (LPC_WDT->WDMOD & 0x4); |
| nr | 0:f39b85bbe46f | 30 | } |