robocar-pca9685/cmd/rc-pca9685/rc-pca9685.go

package main

import (
	"flag"
	"github.com/cyrilix/robocar-base/cli"
	rc "github.com/cyrilix/robocar-pca9685/actuator"
	"github.com/cyrilix/robocar-pca9685/part"
	log "github.com/sirupsen/logrus"
	"os"
)

const (
	DefaultClientId = "robocar-pca9685"
	SteeringChannel = 0
	ThrottleChannel = 1

	ThrottleStoppedPWM = 1455
	ThrottleMinPWM     = 1113
	ThrottleMaxPWM     = 1800

	SteeringLeftPWM  = 1004
	SteeringRightPWM = 1986
)

func main() {
	var mqttBroker, username, password, clientId, topicThrottle, topicSteering string
	var debug bool

	mqttQos := cli.InitIntFlag("MQTT_QOS", 0)
	_, mqttRetain := os.LookupEnv("MQTT_RETAIN")

	cli.InitMqttFlags(DefaultClientId, &mqttBroker, &username, &password, &clientId, &mqttQos, &mqttRetain)
	flag.BoolVar(&debug, "debug", false, "Display raw value to debug")

	var throttleChannel, throttleStoppedPWM, throttleMinPWM, throttleMaxPWM int
	if err := cli.SetIntDefaultValueFromEnv(&throttleChannel, "THROTTLE_CHANNEL", ThrottleChannel); err != nil {
		log.Warningf("unable to init throttleChannel arg: %v", err)
	}
	if err := cli.SetIntDefaultValueFromEnv(&throttleStoppedPWM, "THROTTLE_STOPPED_PWM", ThrottleStoppedPWM); err != nil {
		log.Warningf("unable to init throttleStoppedPWM arg: %v", err)
	}
	if err := cli.SetIntDefaultValueFromEnv(&throttleMinPWM, "THROTTLE_MIN_PWM", ThrottleMinPWM); err != nil {
		log.Warningf("unable to init throttleMinPWM arg: %v", err)
	}
	if err := cli.SetIntDefaultValueFromEnv(&throttleMaxPWM, "THROTTLE_MAX_PWM", ThrottleMaxPWM); err != nil {
		log.Warningf("unable to init throttleMaxPWM arg: %v", err)
	}

	var steeringChannel, steeringLeftPWM, steeringRightPWM int
	if err := cli.SetIntDefaultValueFromEnv(&steeringChannel, "STEERING_CHANNEL", SteeringChannel); err != nil {
		log.Warningf("unable to init steeringChannel arg: %v", err)
	}
	if err := cli.SetIntDefaultValueFromEnv(&steeringLeftPWM, "STEERING_LEFT_PWM", SteeringLeftPWM); err != nil {
		log.Warningf("unable to init steeringLeftPWM arg: %v", err)
	}
	if err := cli.SetIntDefaultValueFromEnv(&steeringRightPWM, "STEERING_RIGHT_PWM", SteeringRightPWM); err != nil {
		log.Warningf("unable to init steeringRightPWM arg: %v", err)
	}

	var updatePWMFrequency int
	if err := cli.SetIntDefaultValueFromEnv(&updatePWMFrequency, "UPDATE_PWM_FREQUENCY", 25); err != nil {
		log.Warningf("unable to init updatePWMFrequency arg: %v", err)
	}

	flag.StringVar(&topicThrottle, "mqtt-topic-throttle", os.Getenv("MQTT_TOPIC_THROTTLE"), "Mqtt topic that contains throttle value, use MQTT_TOPIC_THROTTLE if args not set")
	flag.StringVar(&topicSteering, "mqtt-topic-steering", os.Getenv("MQTT_TOPIC_STEERING"), "Mqtt topic that contains steering value, use MQTT_TOPIC_STEERING if args not set")
	flag.IntVar(&throttleChannel, "throttle-channel", throttleChannel, "I2C channel to use to control throttle, THROTTLE_CHANNEL env if args not set")
	flag.IntVar(&steeringChannel, "steering-channel", steeringChannel, "I2C channel to use to control steering, STEERING_CHANNEL env if args not set")
	flag.IntVar(&throttleStoppedPWM, "throttle-zero-pwm", throttleStoppedPWM, "Zero value for throttle PWM, THROTTLE_STOPPED_PWM env if args not set")
	flag.IntVar(&throttleMinPWM, "throttle-min-pwm", throttleMinPWM, "Min value for throttle PWM, THROTTLE_MIN_PWM env if args not set")
	flag.IntVar(&throttleMaxPWM, "throttle-max-pwm", throttleMaxPWM, "Max value for throttle PWM, THROTTLE_MAX_PWM env if args not set")
	flag.IntVar(&steeringLeftPWM, "steering-left-pwm", steeringLeftPWM, "Max left value for steering PWM, STEERING_STOPPED_PWM env if args not set")
	flag.IntVar(&steeringRightPWM, "steering-right-pwm", steeringRightPWM, "Max right value for steering PWM, STEERING_MIN_PWM env if args not set")
	flag.IntVar(&updatePWMFrequency, "update-pwm-frequency", updatePWMFrequency, "Number of update values per seconds, UPDATE_PWM_FREQUENCY env if args not set")

	flag.Parse()
	if len(os.Args) <= 1 {
		flag.PrintDefaults()
		os.Exit(1)
	}

	if debug {
		log.SetLevel(log.DebugLevel)
	}

	client, err := cli.Connect(mqttBroker, username, password, clientId)
	if err != nil {
		log.Fatalf("unable to connect to mqtt bus: %v", err)
	}
	defer client.Disconnect(50)

	t := rc.NewThrottle(throttleChannel, throttleStoppedPWM, throttleMinPWM, throttleMaxPWM)
	s := rc.NewSteering(steeringChannel, steeringLeftPWM, steeringRightPWM)

	p := part.NewPca9685Part(client, t, s, updatePWMFrequency, topicThrottle, topicSteering)
	err = p.Start()
	if err != nil {
		log.Fatalf("unable to start service: %v", err)
	}
}