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snippets:watchdog [2013/04/09 15:46] – ba | snippets:watchdog [2015/04/02 10:40] – ba | ||
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If the Toggle Watchdog C-Node is executed, the watchdog timer register is reloaded with the value given by the Enable Watchdog C-Node.\\ | If the Toggle Watchdog C-Node is executed, the watchdog timer register is reloaded with the value given by the Enable Watchdog C-Node.\\ | ||
If the watchdog timer register reaches zero before it is toggled the processor is reseted and the flashed program is booted and executed from start.\\ | If the watchdog timer register reaches zero before it is toggled the processor is reseted and the flashed program is booted and executed from start.\\ | ||
- | {{: | + | Typically the " |
- | {{: | + | |
+ | | | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | **notes: | ||
+ | * This c-nodes work on any target, but only in compiled mode | ||
+ | * Once the watchdog is enabled, debugging gets complicated. For this reason add the watchdog only at the very end of a development cycle | ||
+ | * If you need to survey several parallel loops, insert the " | ||
+ | * A reset during a file function can corrupt a file system | ||
+ | * When inserting the in line C-nodes the following warnings are generated.\\ This warning can be ignored, because it is about a disabled part of the block diagram. {{: | ||
+ | |||
+ | ====== check if a reset was caused by the watchdog ====== | ||
+ | |||
+ | {{: | ||
+ | |||
+ | ====== save last programm state ====== | ||
+ | With this snippet you can write and read a memory space that is not initialized at boot time:\\ | ||
+ | {{: | ||
+ | |||
+ | The value read is undefined, when there was a power loss. | ||
+ | |||
+ | When a watchdog event occured or a reset signal was applied the value ramains the same as bevore the reset. | ||
+ | |||
+ | |||
+ | |||
+ | The memory space is written and read by the following functions: | ||
+ | |||
+ | - Mass storage device | ||
+ | - Format file system | ||
+ | - Firmware update | ||
+ | |||
+ | |||
+ | |||
+ | The usable memory space is 16bytes long. With U32 an I32 Values 4 values can be written at the following locations: | ||
+ | |||
+ | 0xFF800000 | ||
+ | 0xFF800004 | ||
+ | 0xFF800008 | ||
+ | 0xFF80000C | ||
+ | |||
+ | |||