[watchdog] Update ext watchdog function for ADM8623. WDI is mostly low, see section "WATCHDOG INPUT CURRENT"

firmware/src/watchdog.c

@@ -39,13 +39,17 @@ struct idle_counter idle_count, idle_count_max;
 
 idle_wait_t last_idle_t = IDLE_NONE;
 
-#define kick_external_watchdog()	port_pin_toggle_output_level(WDT_WDI_PIN)
+#define kick_external_watchdog()	do { port_pin_set_output_level(WDT_WDI_PIN, 1); \
+    __NOP();                      /* > 50ns high */                     \
+    port_pin_set_output_level(WDT_WDI_PIN, 0);                          \
+  } while(1)
 
 /**
  * Increments the specified idle counter
  */
 void increment_idle_counter(idle_wait_t idle_t)
 {
+
   switch (idle_t) {
     case IDLE_TELEMETRY_ACTIVE:
       idle_count.while_telemetry_active++;