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STM32 IWDG watchdog works

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4619 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2012-04-16 21:13:54 +00:00
parent eafd60119f
commit 9807861757
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10
configs/stm32f4discovery/README.txt
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@ -843,3 +843,13 @@ Where <subdir> is one of the following:
CONFIG_WATCHDOG=y : Enables watchdog timer driver support
CONFIG_STM32_WWDG=y : Enables the WWDG timer facility, OR
CONFIG_STM32_IWDG=y : Enables the IWDG timer facility (but not both)
The WWDG watchdog is driven off the (fast) 42MHz PCLK1 and, as result,
has a maximum timout value of 49 milliseconds. for WWDG watchdog, you
should also add the fillowing to the configuration file:
CONFIG_EXAMPLES_WATCHDOG_PINGDELAY=20
CONFIG_EXAMPLES_WATCHDOG_TIMEOUT=49
The IWDG timer has a range of about 35 seconds and should not be an issue.