![](/media/cache/profiles/8631e5b91354a846f00dbbf16ad94259.jpg.50x50_q85.jpg)
Example of watchdog with poor coverage
Fork of Watchdog_sample_fail by
main.cpp
- Committer:
- Manel_Marin
- Date:
- 2015-11-21
- Revision:
- 0:5ce3cfc57999
- Child:
- 1:159a09ac60ba
File content as of revision 0:5ce3cfc57999:
#include "mbed.h" //WATHDOG ENABLED IN OUR KL25Z_SystemInit.c (overloading library function SystemInit.c) // It happens in this uC after reset watchdog is enabled with timeout=1024ms (2^10*LPO=1KHz) // so mbed developers to allow a learning use of this board disable it on SystemInit.c // **BUT** SIM_COPC register can only be written once after reset and so it can not be enabled later // I think best solution is to overload SystemInit() using: void $Sub$$SystemInit (void) { // original SystemInit() does not appear in export, it must be dowloaded from: // https://developer.mbed.org/users/mbed_official/code/mbed-src/file/a11c0372f0ba/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL25Z/system_MKL25Z4.c // you can arrive there from: // https://developer.mbed.org/handbook/mbed-SDK and https://developer.mbed.org/users/mbed_official/code/mbed-src/ // // MORE on this on: https://developer.mbed.org/users/chris/notebook/Patching-functions-and-libraries/ // and searching "ARM Compiler toolchain Using the Linker" "Using $Super$$ and $Sub$$ to patch symbol definitions" // Kick (feed, reload) our watchdog timer void wdt_kick(){ SIM->SRVCOP = (uint32_t)0x55u; SIM->SRVCOP = (uint32_t)0xAAu; } // That set RED LED ON, do that first to evaluate boot time of peripherals #define LIGHT 0 #define DARK 1 DigitalOut led_red(LED_RED, LIGHT); DigitalOut led_green(LED_GREEN, DARK); DigitalOut led_blue(LED_BLUE, DARK); //Virtual serial port over USB using inboard second USB connector (USBKL25Z port) #include "USBSerial.h" //USBSerial pc; //...( vendor_id, product_id, product_release, connect_blocking ) USBSerial pc( 0x1f00, 0x2012, 0x0001, false ); //REMEMBER TO USE: class USBSerial -> connect_blocking = false (default is true) // to avoid block of program when no USB cable connected in USBKL25Z port //NOTE: USBSerial still blocks program when closing serial terminal, that is fixed by our watchdog int main(void) { //to evaluate boot time I set led RED ON at the beginning of our main.cpp. TODO?: do it in SystemInit? led_blue = DARK; led_green = DARK; led_red = DARK; while(1) { led_blue = LIGHT; pc.printf("I am a virtual serial port\r\n"); // THAT COULD BLOCK wdt_kick(); led_blue = DARK; wait(0.5); } }