esp32[c3]: Add XTWDT support

[eren-terzioglu]

Summary

esp32[c3]: Add XTWDT support

Impact

Only ESP32-C3

Testing

esp32c3-generic:watchdog config used with following options enabled:

CONFIG_ESPRESSIF_XTWDT=y
CONFIG_ESPRESSIF_RTCIO_IRQ=y
CONFIG_ESPRESSIF_RTC=y
CONFIG_ESPRESSIF_RTC_CLK_EXT_OSC=y
CONFIG_ESPRESSIF_XTWDT=y

To simulate 32768hz clock output, another esp device used with adjusted timer example. Clock connected to external oscillator pin (GPIO0) and these lines added to watchdog example to check output:

//apps/examples/watchdog/watchdog_main.c:215
static int wdt_handler(int irq, FAR void *context, FAR void *arg)
{
  printf("IRQ: %d\n", irq);
  return OK;
}

//apps/examples/watchdog/watchdog_main.c:258
struct watchdog_capture_s handlers_xtwdt;
handlers_xtwdt.oldhandler = NULL;
handlers_xtwdt.newhandler = wdt_handler; 

ioctl(fd, WDIOC_CAPTURE, (unsigned long)((uintptr_t) (&handlers_xtwdt)));
if (ret < 0)
{
    ret = errno;
    wderr("Error: %d\n", ret);
    goto errout_with_dev;
}

wdog -i /dev/watchdog3 command applied and during runtime clock connection removed. Expected output needs to be like this:

wdog_ioctl: cmd: 515 arg: 1070123900
wdog_main: flags=00000005 timeout=2000 timeleft=0
  NO ping elapsed=15000
IRQ: 84

[acassis]

@eren-terzioglu I think there is also a table in the Documentation with supported peripherals, please update that information there

[eren-terzioglu]

@eren-terzioglu I think there is also a table in the Documentation with supported peripherals, please update that information there

It was already set as true

[acassis]

Maybe in NOTES you can include XTWDT

[eren-terzioglu]

Maybe in NOTES you can include XTWDT

Added, thanks