Merge pull request ARMmbed#14555 from OpenNuvoton/nuvoton_wdt_stop-n-kick

Nuvoton: Fix hal_watchdog_kick() with WDT stopped

Author: 0xc0170

targets/TARGET_NUVOTON/TARGET_M451/watchdog_api.c

@@ -125,6 +125,11 @@ watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
 
 void hal_watchdog_kick(void)
 {
+    /* If a watchdog is not running, this function does nothing */
+    if (!(WDT->CTL & WDT_CTL_WDTEN_Msk)) {
+        return;
+    }
+
     wdt_timeout_rmn_clk = NU_MS2WDTCLK(wdt_timeout_reload_ms);
     watchdog_setup_cascade_timeout();
 }

targets/TARGET_NUVOTON/TARGET_M480/watchdog_api.c

@@ -126,6 +126,11 @@ watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
 
 void hal_watchdog_kick(void)
 {
+    /* If a watchdog is not running, this function does nothing */
+    if (!(WDT->CTL & WDT_CTL_WDTEN_Msk)) {
+        return;
+    }
+
     wdt_timeout_rmn_clk = NU_MS2WDTCLK(wdt_timeout_reload_ms);
     watchdog_setup_cascade_timeout();
 }

targets/TARGET_NUVOTON/TARGET_NANO100/watchdog_api.c

@@ -123,6 +123,11 @@ watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
 
 void hal_watchdog_kick(void)
 {
+    /* If a watchdog is not running, this function does nothing */
+    if (!(WDT->CTL & WDT_CTL_WTE_Msk)) {
+        return;
+    }
+
     wdt_timeout_rmn_clk = NU_MS2WDTCLK(wdt_timeout_reload_ms);
     watchdog_setup_cascade_timeout();
 }

targets/TARGET_NUVOTON/TARGET_NUC472/watchdog_api.c

@@ -124,6 +124,11 @@ watchdog_status_t hal_watchdog_init(const watchdog_config_t *config)
 
 void hal_watchdog_kick(void)
 {
+    /* If a watchdog is not running, this function does nothing */
+    if (!(WDT->CTL & WDT_CTL_WDTEN_Msk)) {
+        return;
+    }
+
     wdt_timeout_rmn_clk = NU_MS2WDTCLK(wdt_timeout_reload_ms);
     watchdog_setup_cascade_timeout();
 }