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98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package I2C
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import (
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"time"
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_ "fmt"
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"sync"
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)
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/*
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i2c monitor implements a long running monitor responsible for sending active devices to the rlc
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*/
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type I2CMonitor struct {
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*I2CBus
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Devices *devs
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DevChan chan int
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}
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type devs struct {
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sync.Mutex
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m map[int]*I2CDevice
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}
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func NewMonitor(bus int,ch chan int) *I2CMonitor {
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m := &I2CMonitor{}
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b := NewBus(bus)
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m.I2CBus = b
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d := make(map[int]*I2CDevice)
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m.Devices = &devs{m:d}
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m.DevChan = ch
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return m
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}
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func (m *I2CMonitor) Update() {
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/*
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scans bus and adds new active devices
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*/
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devs := m.Scan()
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chng := m.Devices.Parse(m.I2CBus,devs)
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for _, d := range chng {
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go m.ConnectDevice(d)
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}
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}
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func (m *I2CMonitor) Monitor() {
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// functon that updates the device list and notifies rlc of any changes to sensor composition
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s := make(chan struct{})
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t := 5 * time.Second
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go func(signal chan struct{},to time.Duration) { // simple signal func to init scan
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for {
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signal <-struct{}{}
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time.Sleep(to)
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}
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}(s,t)
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for {
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<-s
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m.Update()
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}
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}
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func (m *I2CMonitor) ConnectDevice(addr int) {
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m.DevChan <-addr
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}
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func (m *I2CMonitor) GetDevice(addr int) interface{ GetAddr() int; GetData() string; GetStatus() string; GetType() string } {
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m.Devices.Lock()
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defer m.Devices.Unlock()
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return m.Devices.m[addr]
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}
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func (d *devs) Parse(bus *I2CBus,devices map[int]bool) []int {
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d.Lock()
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defer d.Unlock()
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newdevs := []int{}
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for addr, status := range devices {
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if dev, exists := d.m[addr]; exists {
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// device seen
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if status != dev.bool { // if device state changed
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dev.bool = status
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if status {
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newdevs = append(newdevs,dev.GetAddr())
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}
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}
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} else {
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// device not seen yet
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if status {
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// active
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newd := NewDevice(addr,bus)
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newd.bool = status
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d.m[addr] = newd
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newdevs = append(newdevs,newd.GetAddr())
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}
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}
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}
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return newdevs
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}
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