fermentord/internal/hw/gpio.go

package hw

import (
	"github.com/warthog618/gpiod"
)

const (
	pinCoolerPower = 23
	pinHeaterPower = 24

	off = 0
	on  = 1
)

type Gpio struct {
	chip        *gpiod.Chip
	coolerPower *gpiod.Line
	heaterPower *gpiod.Line
}

func NewGpio() (*Gpio, error) {
	var err error
	p := &Gpio{}

	p.chip, err = gpiod.NewChip("gpiochip0", gpiod.WithConsumer("fermentord"))
	if err != nil {
		return nil, err
	}

	p.coolerPower, err = p.chip.RequestLine(pinCoolerPower, gpiod.AsOutput(1))
	if err != nil {
		return nil, err
	}

	p.heaterPower, err = p.chip.RequestLine(pinHeaterPower, gpiod.AsOutput(1))
	if err != nil {
		return nil, err
	}

	return p, nil
}

func (p *Gpio) Close() {
	p.coolerPower.SetValue(off)
	p.heaterPower.SetValue(off)

	p.heaterPower.Close()
	p.coolerPower.Close()
	p.chip.Close()
}

func (p *Gpio) StartCooler() {
	p.coolerPower.SetValue(on)
}

func (p *Gpio) StopCooler() {
	p.coolerPower.SetValue(off)
}

func (p *Gpio) StartHeater() {
	p.heaterPower.SetValue(on)
}

func (p *Gpio) StopHeater() {
	p.heaterPower.SetValue(off)
}