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Example of watchdog with poor coverage
Fork of Watchdog_sample_fail by
main.cpp@0:5ce3cfc57999, 2015-11-21 (annotated)
- Committer:
- Manel_Marin
- Date:
- Sat Nov 21 13:24:29 2015 +0000
- Revision:
- 0:5ce3cfc57999
- Child:
- 1:159a09ac60ba
Working fully documented example
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Manel_Marin | 0:5ce3cfc57999 | 1 | #include "mbed.h" |
Manel_Marin | 0:5ce3cfc57999 | 2 | |
Manel_Marin | 0:5ce3cfc57999 | 3 | //WATHDOG ENABLED IN OUR KL25Z_SystemInit.c (overloading library function SystemInit.c) |
Manel_Marin | 0:5ce3cfc57999 | 4 | // It happens in this uC after reset watchdog is enabled with timeout=1024ms (2^10*LPO=1KHz) |
Manel_Marin | 0:5ce3cfc57999 | 5 | // so mbed developers to allow a learning use of this board disable it on SystemInit.c |
Manel_Marin | 0:5ce3cfc57999 | 6 | // **BUT** SIM_COPC register can only be written once after reset and so it can not be enabled later |
Manel_Marin | 0:5ce3cfc57999 | 7 | // I think best solution is to overload SystemInit() using: void $Sub$$SystemInit (void) { |
Manel_Marin | 0:5ce3cfc57999 | 8 | // original SystemInit() does not appear in export, it must be dowloaded from: |
Manel_Marin | 0:5ce3cfc57999 | 9 | // https://developer.mbed.org/users/mbed_official/code/mbed-src/file/a11c0372f0ba/targets/cmsis/TARGET_Freescale/TARGET_KLXX/TARGET_KL25Z/system_MKL25Z4.c |
Manel_Marin | 0:5ce3cfc57999 | 10 | // you can arrive there from: |
Manel_Marin | 0:5ce3cfc57999 | 11 | // https://developer.mbed.org/handbook/mbed-SDK and https://developer.mbed.org/users/mbed_official/code/mbed-src/ |
Manel_Marin | 0:5ce3cfc57999 | 12 | // |
Manel_Marin | 0:5ce3cfc57999 | 13 | // MORE on this on: https://developer.mbed.org/users/chris/notebook/Patching-functions-and-libraries/ |
Manel_Marin | 0:5ce3cfc57999 | 14 | // and searching "ARM Compiler toolchain Using the Linker" "Using $Super$$ and $Sub$$ to patch symbol definitions" |
Manel_Marin | 0:5ce3cfc57999 | 15 | |
Manel_Marin | 0:5ce3cfc57999 | 16 | // Kick (feed, reload) our watchdog timer |
Manel_Marin | 0:5ce3cfc57999 | 17 | void wdt_kick(){ |
Manel_Marin | 0:5ce3cfc57999 | 18 | SIM->SRVCOP = (uint32_t)0x55u; |
Manel_Marin | 0:5ce3cfc57999 | 19 | SIM->SRVCOP = (uint32_t)0xAAu; |
Manel_Marin | 0:5ce3cfc57999 | 20 | } |
Manel_Marin | 0:5ce3cfc57999 | 21 | |
Manel_Marin | 0:5ce3cfc57999 | 22 | // That set RED LED ON, do that first to evaluate boot time of peripherals |
Manel_Marin | 0:5ce3cfc57999 | 23 | #define LIGHT 0 |
Manel_Marin | 0:5ce3cfc57999 | 24 | #define DARK 1 |
Manel_Marin | 0:5ce3cfc57999 | 25 | DigitalOut led_red(LED_RED, LIGHT); |
Manel_Marin | 0:5ce3cfc57999 | 26 | DigitalOut led_green(LED_GREEN, DARK); |
Manel_Marin | 0:5ce3cfc57999 | 27 | DigitalOut led_blue(LED_BLUE, DARK); |
Manel_Marin | 0:5ce3cfc57999 | 28 | |
Manel_Marin | 0:5ce3cfc57999 | 29 | //Virtual serial port over USB using inboard second USB connector (USBKL25Z port) |
Manel_Marin | 0:5ce3cfc57999 | 30 | #include "USBSerial.h" |
Manel_Marin | 0:5ce3cfc57999 | 31 | //USBSerial pc; |
Manel_Marin | 0:5ce3cfc57999 | 32 | //...( vendor_id, product_id, product_release, connect_blocking ) |
Manel_Marin | 0:5ce3cfc57999 | 33 | USBSerial pc( 0x1f00, 0x2012, 0x0001, false ); |
Manel_Marin | 0:5ce3cfc57999 | 34 | //REMEMBER TO USE: class USBSerial -> connect_blocking = false (default is true) |
Manel_Marin | 0:5ce3cfc57999 | 35 | // to avoid block of program when no USB cable connected in USBKL25Z port |
Manel_Marin | 0:5ce3cfc57999 | 36 | //NOTE: USBSerial still blocks program when closing serial terminal, that is fixed by our watchdog |
Manel_Marin | 0:5ce3cfc57999 | 37 | |
Manel_Marin | 0:5ce3cfc57999 | 38 | |
Manel_Marin | 0:5ce3cfc57999 | 39 | int main(void) { |
Manel_Marin | 0:5ce3cfc57999 | 40 | //to evaluate boot time I set led RED ON at the beginning of our main.cpp. TODO?: do it in SystemInit? |
Manel_Marin | 0:5ce3cfc57999 | 41 | led_blue = DARK; |
Manel_Marin | 0:5ce3cfc57999 | 42 | led_green = DARK; |
Manel_Marin | 0:5ce3cfc57999 | 43 | led_red = DARK; |
Manel_Marin | 0:5ce3cfc57999 | 44 | while(1) |
Manel_Marin | 0:5ce3cfc57999 | 45 | { |
Manel_Marin | 0:5ce3cfc57999 | 46 | led_blue = LIGHT; |
Manel_Marin | 0:5ce3cfc57999 | 47 | pc.printf("I am a virtual serial port\r\n"); // THAT COULD BLOCK |
Manel_Marin | 0:5ce3cfc57999 | 48 | wdt_kick(); |
Manel_Marin | 0:5ce3cfc57999 | 49 | led_blue = DARK; |
Manel_Marin | 0:5ce3cfc57999 | 50 | wait(0.5); |
Manel_Marin | 0:5ce3cfc57999 | 51 | } |
Manel_Marin | 0:5ce3cfc57999 | 52 | } |