FrogPilot community - Add SNG for 2017 Chevy Volt

Co-Authored-By: garrettpall <76917194+garrettpall@users.noreply.github.com>

selfdrive/car/gm/carcontroller.py

@@ -6,7 +6,7 @@ from openpilot.common.params_pyx import Params
 from opendbc.can.packer import CANPacker
 from openpilot.selfdrive.car import apply_driver_steer_torque_limits, create_gas_interceptor_command
 from openpilot.selfdrive.car.gm import gmcan
-from openpilot.selfdrive.car.gm.values import DBC, CanBus, CarControllerParams, CruiseButtons, GMFlags, CC_ONLY_CAR, SDGM_CAR, EV_CAR
+from openpilot.selfdrive.car.gm.values import DBC, CanBus, CarControllerParams, CruiseButtons, GMFlags, CC_ONLY_CAR, SDGM_CAR, EV_CAR, AccState
 from openpilot.selfdrive.car.interfaces import CarControllerBase
 
 VisualAlert = car.CarControl.HUDControl.VisualAlert
@@ -161,8 +161,13 @@ class CarController(CarControllerBase):
             resume = actuators.longControlState != LongCtrlState.starting or CC.cruiseControl.resume
             at_full_stop = at_full_stop and not resume
 
+          if CC.cruiseControl.resume and CS.pcm_acc_status == AccState.STANDSTILL and frogpilot_toggles.volt_sng:
+            acc_engaged = False
+          else:
+            acc_engaged = CC.enabled
+
           # GasRegenCmdActive needs to be 1 to avoid cruise faults. It describes the ACC state, not actuation
-          can_sends.append(gmcan.create_gas_regen_command(self.packer_pt, CanBus.POWERTRAIN, self.apply_gas, idx, CC.enabled, at_full_stop))
+          can_sends.append(gmcan.create_gas_regen_command(self.packer_pt, CanBus.POWERTRAIN, self.apply_gas, idx, acc_engaged, at_full_stop))
           can_sends.append(gmcan.create_friction_brake_command(self.packer_ch, friction_brake_bus, self.apply_brake,
                                                              idx, CC.enabled, near_stop, at_full_stop, self.CP))
 

selfdrive/car/gm/carstate.py

@@ -172,6 +172,8 @@ class CarState(CarStateBase):
     # FrogPilot CarState functions
     fp_ret.hasMenu = not (self.CP.flags & GMFlags.NO_CAMERA.value or self.CP.carFingerprint in CC_ONLY_CAR)
 
+    self.pcm_acc_status = pt_cp.vl["AcceleratorPedal2"]["CruiseState"]
+
     return ret, fp_ret
 
   @staticmethod