Anastasios Barlas
/
Watchdog_sample_nocoverage
Lab 6 Part 1
Fork of Watchdog_sample_nocoverage by
main.cpp
- Committer:
- WilliamMarshQMUL
- Date:
- 2017-02-28
- Revision:
- 1:159a09ac60ba
- Parent:
- 0:5ce3cfc57999
- Child:
- 2:c31a1758ac38
File content as of revision 1:159a09ac60ba:
#include "mbed.h" #include "wdt.h" //WATCHDOG ENABLED (overloading library function SystemInit.c) // // The KL25Z watchdog is enabled after reset with timeout=1024ms (2^10*LPO=1KHz) // To make the dvice easy to use on mbed, th watchdog is disabled at startup // (in file SystemInit.c) **BUT** SIM_COPC register can only be written once // after reset and so it can not be enabled later. To resolve this, // SystemInit() is overloaded using: void $Sub$$SystemInit (void) { // // The original SystemInit() can be dowloaded from: // https://developer.mbed.org/users/mbed_official/code/mbed-src/ // navigating to ... targets/cmsis/TARGET_Freescale/TARGET_KLXX/ // TARGET_KL25Z/system_MKL25Z4.c // // MORE on how this overides the original initialisation: // https://developer.mbed.org/users/chris/notebook/Patching-functions-and-libraries/ // and searching "ARM Compiler toolchain Using the Linker" // "Using $Super$$ and $Sub$$ to patch symbol definitions" #define LIGHT 0 #define DARK 1 DigitalOut led_red(LED_RED, LIGHT); DigitalOut led_blue(LED_BLUE, DARK); // Demonstate the watchdog // The red LED is on after reset // Th blue LED flashes and the watch dog is fed // Aft 5sec, stop feeding the watchdog enum wState {Working, Stopped} ; int main(void) { // initialise watchdog wdt_1sec() ; // state of the watch dog wState watchDog = Working ; int counter = 10 ; // show start-up led_blue = DARK; led_red = LIGHT; wait(0.5) ; led_red = DARK; // Note: the red LED now stays OFF until processor reset while(1) { led_blue = LIGHT; wait(0.25); if (watchDog == Working) wdt_kick_all() ; led_blue = DARK; wait(0.25); // When the counter rachs zero, chang state to stop watchdog if (counter > 0) counter-- ; else watchDog = Stopped ; } }