From d302d3c90a208d988e611cc6f4a56d03b6223b28 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Tue, 20 Jul 2021 14:19:40 +1000
Subject: [PATCH] HAL_ChibiOS: implement valid_pin()

---
 libraries/AP_HAL_ChibiOS/GPIO.cpp | 6 ++++++
 libraries/AP_HAL_ChibiOS/GPIO.h   | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/libraries/AP_HAL_ChibiOS/GPIO.cpp b/libraries/AP_HAL_ChibiOS/GPIO.cpp
index 7481b8f2e8..39be31eb3b 100644
--- a/libraries/AP_HAL_ChibiOS/GPIO.cpp
+++ b/libraries/AP_HAL_ChibiOS/GPIO.cpp
@@ -440,6 +440,12 @@ bool GPIO::wait_pin(uint8_t pin, INTERRUPT_TRIGGER_TYPE mode, uint32_t timeout_u
     return msg == MSG_OK;
 }
 
+// check if a pin number is valid
+bool GPIO::valid_pin(uint8_t pin) const
+{
+    return gpio_by_pin_num(pin) != nullptr;
+}
+
 #ifndef IOMCU_FW
 /*
   timer to setup interrupt quotas for a 100ms period from
diff --git a/libraries/AP_HAL_ChibiOS/GPIO.h b/libraries/AP_HAL_ChibiOS/GPIO.h
index a198bdd75a..1b9949ee8a 100644
--- a/libraries/AP_HAL_ChibiOS/GPIO.h
+++ b/libraries/AP_HAL_ChibiOS/GPIO.h
@@ -78,6 +78,9 @@ public:
     void timer_tick(void) override;
 #endif
 
+    // check if a pin number is valid
+    bool valid_pin(uint8_t pin) const override;
+
     /*
       resolve an ioline to take account of alternative configurations
      */