Disable watchdog timer before build.

.gitignore

@@ -13,3 +13,4 @@ target/
 .vscode/
 .DS_Store
 *.swp
+.idea/

cargo-espflash/src/main.rs

@@ -161,6 +161,7 @@ fn flash(args: FlashArgs, config: &Config) -> Result<()> {
     let chip = flasher.chip();
     let target = chip.into_target();
     let target_xtal_freq = target.crystal_freq(flasher.connection())?;
+    flasher.disable_watchdog()?;
 
     let build_ctx =
         build(&args.build_args, &cargo_config, chip).wrap_err("Failed to build project")?;

espflash/src/flasher/mod.rs

@@ -337,6 +337,12 @@ impl Flasher {
         Ok(flasher)
     }
 
+    pub fn disable_watchdog(&mut self) -> Result<(), Error> {
+        let mut target = self.chip.flash_target(self.spi_params, self.use_stub);
+        target.begin(&mut self.connection).flashing()?;
+        Ok(())
+    }
+
     /// Load flash stub
     fn load_stub(&mut self) -> Result<(), Error> {
         debug!("Loading flash stub for chip: {:?}", self.chip);

espflash/src/targets/flash_target/esp32.rs

@@ -50,7 +50,9 @@ impl FlashTarget for Esp32Target {
 
         // The stub usually disables these watchdog timers, however if we're not using the stub
         // we need to disable them before flashing begins
-        if !self.use_stub && connection.get_usb_pid()? == USB_SERIAL_JTAG_PID {
+        // TODO: the stub doesn't appear to disable the watchdog on ESP32-S3, so we explicitly
+        //       disable the watchdog here.
+        if connection.get_usb_pid()? == USB_SERIAL_JTAG_PID {
             match self.chip {
                 Chip::Esp32c3 => {
                     connection.command(Command::WriteReg {