Simulator

/boards/sim/sim/sim

Custom NuttX simulator board used by Dawn:

• unnecessary functionality removed from board files

• most configurations enable Dawn’s fake drivers so the descriptor-driven pipeline runs on the host without real peripherals; see Fake Devices and Host-based Development for the broader host workflow

Configs

dynamic_desc

Serial descriptor-switching profile using dynamic_desc_slot0.yaml as the boot descriptor. It enables descriptor slots, descriptor upload, descriptor selection, and capabilities reporting.

nsh_blinky_shell

Simulator runtime-control example with shell access. A sequencer drives a fake user LED, while start/stop and dwell reconfiguration are available from the blinky> shell prompt. Uses blinky_shell_demo.yaml.

nsh_can

CAN protocol reference configuration using ntfc_can_dummy.yaml with the Dawn shell enabled for inspection.

nsh_feature_modbus

Feature Modbus RTU profile using feature_modbus_slot0.yaml as the boot descriptor. It enables descriptor slots so the full feature descriptor can be uploaded and activated at runtime.

nsh_gateway

Serial-to-CAN gateway reference configuration using gateway_serial_can.yaml.

nsh_modbus_rtu

Modbus RTU reference configuration using ntfc_modbus_rtu_dummy_map.yaml.

Prepare host link:

socat PTY,link=/tmp/ttySIM0 PTY,link=/tmp/ttyNX0

nsh_nxscope

NXScope serial reference configuration using nxscope_serial.yaml.

Prepare host link:

socat PTY,link=/tmp/ttySIM0 PTY,link=/tmp/ttyNX0

nsh_programs_can

Programs-over-CAN reference profile using ntfc_programs_can.yaml.

nsh_usensor_can

CAN-to-user-sensor reference profile using can_sensor_producer.yaml. Dawn receives temperature, humidity, barometer, and light values over CAN and publishes them into /dev/uorb/sensor_* topics. The usensor_reader app from examples/apps/usensor_reader is enabled so another NuttX task can read the produced sensor events while Dawn runs in parallel.

nsh_serial

Serial reference configuration using serial_core_demo.yaml.

socat PTY,link=/tmp/ttySIM0 PTY,link=/tmp/ttyNX0

nsh_shell

Dawn shell configuration using shell_core_demo.yaml.

nsh_tests and tests

Unit-test configurations using empty_placeholder.yaml.