liam-geotab opened a new pull request, #19892:
URL: https://github.com/apache/nuttx/pull/19892
## Summary
Add the IWDG implementation for stm32h5.
By doing `git diff -C --find-copies-harder HEAD~3` you will see that this is
a copy of the common m3m4 v1 implementation. It's the same except for a debug
log of the LSI enable bit which is in RCC_CSR in the common implementation, but
in a register called RCC_BDCR on stm32h5.
I looked into using the common implementation on STM32H5 but it's behind
CONFIG_STM32_COMMON_LEGACY in arch/arm/src/common/stm32/Make.defs which stm32h5
currently is not. Therefore, the approach taken to adding IWDG is similar to
stm32l4 which selects STM32_HAVE_IP_WDG_M3M4_V1 in its Kconfig but provides its
own implementation file.
The IWDG is initialized in nucleo-h563zi bringup at /dev/watchdog0.
## Impact
It's an additive change that defines `stm32_iwdginitialize` when
`CONFIG_STM32_IWDG` is enabled.
It initializes IWDG at /dev/watchdog0 on nucleo-h563zi. The path name is
typical and consistent. It may clash with divergent forks.
## Testing
Validated with the watchdog example app. This implementation has also been
in service for some months.
`nucleo-h563zi:nsh` with the following enabled:
```
CONFIG_DEBUG_WATCHDOG=y
CONFIG_DEBUG_WATCHDOG_ERROR=y
CONFIG_DEBUG_WATCHDOG_INFO=y
CONFIG_DEBUG_WATCHDOG_WARN=y
CONFIG_EXAMPLES_WATCHDOG=y
CONFIG_STM32_IWDG=y
```
```
ABCG
stm32_iwdginitialize: Entry: devpath=/dev/watchdog0 lsifreq=32000
stm32_iwdginitialize: RCC BDCR: 0c000003
stm32_settimeout: Entry: timeout=32760
stm32_settimeout: prescaler=6 fiwdg=125 reload=4095
watchdog_register: Entry: path=/dev/watchdog0
NuttShell (NSH) NuttX-13.0.1-RC0
nsh> wdog
wdog_open: crefs: 0
wdog_ioctl: cmd: 516 arg: 2000
stm32_settimeout: Entry: timeout=2000
stm32_settimeout: prescaler=2 fiwdg=2000 reload=4000
wdog_ioctl: cmd: 513 arg: 0
stm32_start: Entry: started
wdog_ioctl: cmd: 515 arg: 536891056
stm32_getstatus: Entry
stm32_getstatus: Status :
stm32_getstatus: flags : 00000003
stm32_getstatus: timeout : 2000
stm32_getstatus: timeleft : 1500
wdowdog_ioctl: cmd: 518 arg: 0
stm32_keepalive: Entry
g_main: flags=00000003 timeout=2000 timeleft=1500
ping elapsed=0
wdog_ioctl: cmd: 515 arg: 536891056
stm32_getstatus: Entry
stm32_getstatus: Status :
stm32_getstatus: flags : 00000003
stm32_getstatus: timeout : 2000
stm32_getstatus: timeleft : 1500
wdowdog_ioctl: cmd: 518 arg: 0
stm32_keepalive: Entry
...shortened...
wdog_ioctl: cmd: 515 arg: 536891056
stm32_getstatus: Entry
stm32_getstatus: Status :
stm32_getstatus: flags : 00000003
stm32_getstatus: timeout : 2000
stm32_getstatus: timeleft : 980
wdog_main: flags=00000003 timeout=2000 timeleft=980
NO ping elapsed=5720
wdog_ioctl: cmd: 515 arg: 536891056
stm32_getstatus: Entry
stm32_getstatus: Status :
stm32_getstatus: flags : 00000003
stm32_getstatus: timeout : 2000
stm32_getstatus: timeleft : 460
wdog_main: flags=00000003 timeout=2000 timeleft=460
NO ping elapsed=6240
ABCG
stm32_iwdginitialize: Entry: devpath=/dev/watchdog0 lsifreq=32000
stm32_iwdginitialize: RCC BDCR: 0c000003
stm32_settimeout: Entry: timeout=32760
stm32_settimeout: prescaler=6 fiwdg=125 reload=4095
watchdog_register: Entry: path=/dev/watchdog0
NuttShell (NSH) NuttX-13.0.1-RC0
nsh>
```
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