HAL_ChibiOS: use opendrain outputs for LEDs on iomcu

libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat

@@ -57,19 +57,19 @@ PB1 TIM3_CH4 TIM3 PWM(8) GPIO(108)
 PC14 IO_HW_DETECT1 INPUT PULLDOWN 
 PC15 IO_HW_DETECT2 INPUT PULLUP   
 
-PB14 HEATER OUTPUT GPIO(0)
+PB14 HEATER OUTPUT OPENDRAIN GPIO(0)
 
 # safety button and LED. These do not use the same names
 # as those for FMU-only boards as we want to handle them specially
 # inside the iofirmware
 PB5 SAFETY_INPUT INPUT PULLDOWN
-PB13 SAFETY_LED OUTPUT HIGH
+PB13 SAFETY_LED OUTPUT HIGH OPENDRAIN
 
 # amber LED
-PB15 AMBER_LED OUTPUT LOW
+PB15 AMBER_LED OUTPUT LOW OPENDRAIN
 
 # green ring LED on cube
-PA11 RING_LED OUTPUT LOW
+PA11 RING_LED OUTPUT LOW OPENDRAIN
 
 # UART for DSM input
 # TX side is for IO debug, and is unused

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -356,7 +356,10 @@ class generic_pin(object):
             else:
                 v = "AF_PP"
         elif self.sig_dir == 'OUTPUT':
-            v = "OUTPUT_PP"
+            if 'OPENDRAIN' in self.extra:
+                v = 'OUTPUT_OD'
+            else:
+                v = "OUTPUT_PP"
         elif self.type.startswith('ADC'):
             v = "ANALOG"
         else: