ardupilot/libraries/AP_HAL/board/sitl.h

#pragma once

#define HAL_BOARD_NAME "SITL"
#define HAL_CPU_CLASS HAL_CPU_CLASS_1000
#define HAL_OS_POSIX_IO 1
#define HAL_OS_SOCKETS 1
#define HAL_STORAGE_SIZE            16384
#define HAL_STORAGE_SIZE_AVAILABLE  HAL_STORAGE_SIZE
#define HAL_BOARD_LOG_DIRECTORY "logs"
#define HAL_BOARD_TERRAIN_DIRECTORY "terrain"
#define HAL_PARAM_DEFAULTS_PATH nullptr
#define HAL_INS_DEFAULT HAL_INS_HIL
#define HAL_BARO_DEFAULT HAL_BARO_HIL
#define HAL_COMPASS_DEFAULT HAL_COMPASS_HIL
#define HAL_GPIO_A_LED_PIN        61
#define HAL_GPIO_B_LED_PIN        48
#define HAL_GPIO_C_LED_PIN        117
#define HAL_GPIO_LED_ON           LOW
#define HAL_GPIO_LED_OFF          HIGH

#define HAL_HAVE_BOARD_VOLTAGE 1
#define HAL_HAVE_SAFETY_SWITCH 1