Merge pull request #35 from EdgePi-Cloud/add-pwm

Add a service for the PWM module

Author: josiah-tesfu

edgepi_rpc_client/services/pwm/__init__.py

@@ -0,0 +1,99 @@
+"""Client for PWM service"""
+import logging
+from edgepirpc.protos import pwm_pb2 as pwm_pb
+from edgepi_rpc_client.client_rpc_channel import ClientRpcChannel
+from edgepi_rpc_client.util.helpers import (
+    filter_arg_values,
+    create_config_request_from_args,
+    get_server_response,
+)
+from edgepi_rpc_client.services.pwm.pwm_pb_enums import PWMPins, Polarity
+
+_logger = logging.getLogger(__name__)
+
+
+# pylint: disable=no-member
+class ClientPWMService:
+    """Client Methods for PWM Service"""
+
+    def __init__(self, transport):
+        self.client_rpc_channel = ClientRpcChannel(transport)
+        self.service_stub = pwm_pb.PWMService_Stub(self.client_rpc_channel)
+        self.rpc_controller = None
+
+    # pylint: disable=unused-argument
+    def set_config(
+        self,
+        pwm_num: PWMPins,
+        frequency: float = None,
+        duty_cycle: float = None,
+        polarity: Polarity = None,
+    ):
+        """set_config method for SDK PWM module"""
+        config_args_dict = filter_arg_values(locals(), "self", None)
+        config_msg = pwm_pb.Config()
+        arg_msg = pwm_pb.Config().ConfArg()
+        request = create_config_request_from_args(config_msg, arg_msg, config_args_dict)
+        return self.perform_call_from_request(
+            request, self.service_stub.set_config, pwm_pb.SuccessMsg
+        ).content
+
+    def enable(self, pwm_num: PWMPins):
+        """enable method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.enable, pwm_pb.SuccessMsg
+        ).content
+
+    def disable(self, pwm_num: PWMPins):
+        """disable method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.disable, pwm_pb.SuccessMsg
+        ).content
+
+    def close(self, pwm_num: PWMPins):
+        """close method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.close, pwm_pb.SuccessMsg
+        ).content
+
+    def init_pwm(self, pwm_num: PWMPins):
+        """init_pwm method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.init_pwm, pwm_pb.SuccessMsg
+        ).content
+
+    def get_frequency(self, pwm_num: PWMPins):
+        """get_frequency method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.get_frequency, pwm_pb.GetFrequency
+        ).frequency
+
+    def get_duty_cycle(self, pwm_num: PWMPins):
+        """get_duty_cycle method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.get_duty_cycle, pwm_pb.GetDutyCycle
+        ).duty_cycle
+
+    def get_polarity(self, pwm_num: PWMPins):
+        """get_polarity method for SDK PWM module"""
+        polarity = self.perform_rpc_call(
+            pwm_num, self.service_stub.get_polarity, pwm_pb.GetPolarity
+        ).polarity
+        return Polarity(polarity)
+
+    def get_enabled(self, pwm_num: PWMPins):
+        """get_enabled method for SDK PWM module"""
+        return self.perform_rpc_call(
+            pwm_num, self.service_stub.get_enabled, pwm_pb.GetEnabled
+        ).enabled
+
+    # TODO: Potentially these helpers in other services and put them in a separate file
+    def perform_rpc_call(self, pwm_num, method, response_type):
+        """Performs RPC call with PWM number and specified method"""
+        request = pwm_pb.PWM(pwm_num=pwm_num.value)
+        return self.perform_call_from_request(request, method, response_type)
+
+    def perform_call_from_request(self, request, method, response_type):
+        """Executes RPC call using provided request and method"""
+        rpc_response = method(self.rpc_controller, request)
+        return get_server_response(rpc_response, response_type)

edgepi_rpc_client/services/pwm/client_pwm_service.py

@@ -0,0 +1,13 @@
+"""Client enums to protobuf PWM enums"""
+from enum import Enum
+from edgepirpc.protos import pwm_pb2 as pwm_pb
+
+class PWMPins(Enum):
+    """PWMPins Enum"""
+    PWM1 = pwm_pb.PWMPins.PWM1
+    PWM2 = pwm_pb.PWMPins.PWM2
+
+class Polarity(Enum):
+    """Polarity Enum"""
+    NORMAL = pwm_pb.Polarity.NORMAL
+    INVERSED = pwm_pb.Polarity.INVERSED

edgepi_rpc_client/services/pwm/pwm_pb_enums.py

@@ -0,0 +1,130 @@
+"""PWMService integration test"""
+import pytest
+import time
+from edgepi_rpc_client.services.pwm.client_pwm_service import ClientPWMService
+from edgepi_rpc_client.services.pwm.pwm_pb_enums import PWMPins, Polarity
+
+
+@pytest.fixture(name="pwm_service")
+def fixture_test_pwm_service():
+    """Inits new PWM service client for testing"""
+    return ClientPWMService('tcp://localhost:4444')
+
+@pytest.mark.parametrize(
+    "args",
+    [
+        {"pwm_num": PWMPins.PWM1, "polarity": Polarity.NORMAL},
+        {"pwm_num": PWMPins.PWM2, "polarity": Polarity.INVERSED},
+        {"pwm_num": PWMPins.PWM1, "frequency": 1000},
+        {"pwm_num": PWMPins.PWM1, "duty_cycle": 0},
+    ]
+)
+def test_set_config(pwm_service, args):
+    """Test for set_config"""
+    response_init = pwm_service.init_pwm(pwm_num=args['pwm_num'])
+    assert response_init == f"Successfully initialized {args['pwm_num']}."
+    response_config = pwm_service.set_config(**args)
+    assert response_config == "Successfully applied pwm configurations."
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_enable(pwm_service, pwm_num):
+    """Test for set_enable"""
+    pwm_service.init_pwm(pwm_num)
+    response = pwm_service.enable(pwm_num)
+    assert response == f"Successfully enabled {pwm_num}."
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_disable(pwm_service, pwm_num):
+    """Test for set_disable"""
+    pwm_service.init_pwm(pwm_num)
+    response = pwm_service.disable(pwm_num)
+    assert response == f"Successfully disabled {pwm_num}."
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_close(pwm_service, pwm_num):
+    """Test for close"""
+    pwm_service.init_pwm(pwm_num)
+    response = pwm_service.close(pwm_num)
+    assert response == f"Successfully closed {pwm_num}."
+
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_get_frequency(pwm_service, pwm_num):
+    """Test for get_frequency"""
+    pwm_service.init_pwm(pwm_num)
+    frequency = pwm_service.get_frequency(pwm_num)
+    assert isinstance(frequency, float)
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_get_duty_cycle(pwm_service, pwm_num):
+    """Test for get_duty_cycle"""
+    pwm_service.init_pwm(pwm_num)
+    duty_cycle = pwm_service.get_duty_cycle(pwm_num)
+    assert isinstance(duty_cycle, float)
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_get_polarity(pwm_service, pwm_num):
+    """Test for get_polarity"""
+    pwm_service.init_pwm(pwm_num)
+    polarity = pwm_service.get_polarity(pwm_num)
+    assert polarity in Polarity
+
+@pytest.mark.parametrize(
+    'pwm_num',
+    [
+        (PWMPins.PWM1),
+        (PWMPins.PWM2),
+    ]
+)
+def test_get_enabled(pwm_service, pwm_num):
+    """Test for get_enabled"""
+    pwm_service.init_pwm(pwm_num)
+    enabled = pwm_service.get_enabled(pwm_num)
+    assert isinstance(enabled, bool)
+
+def test_with_edgepi(pwm_service):
+    """Manual testing of PWM functionality."""
+    pwm_service.init_pwm(pwm_num=PWMPins.PWM1)
+    pwm_service.set_config(pwm_num=PWMPins.PWM1, duty_cycle=0)
+    pwm_service.enable(PWMPins.PWM1)
+    time.sleep(3)
+    pwm_service.set_config(pwm_num=PWMPins.PWM1, duty_cycle=0.5)
+    time.sleep(3)
+    pwm_service.set_config(pwm_num=PWMPins.PWM1, duty_cycle=1)
+