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73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
package I2C
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import (
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"fmt"
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"os/exec"
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"bytes"
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"strings"
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"time"
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"sync"
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"strconv"
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)
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type I2Cdev struct {
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Active bool
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LastSeen time.Time
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}
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type I2CMonitor struct { // used in RLC to synchronize accesses
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Bus int // bus to use {0,1,2}
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Devices map[int]*I2Cdev // mapping to quickly index addresses to their device structs
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Scan <-chan struct{} // empty struct for efficient sends
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Connect chan<- int
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mu sync.Mutex
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}
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func I2Cconnected(bus int) map[int]bool {
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/*
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I2CConnect takes an integer specifying the bus to search as input
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Returns a slice of type I2Cdev
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*/
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b := strconv.Itoa(bus)
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cmd := exec.Command("i2cdetect", "-y", "-r", b)
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var out bytes.Buffer
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cmd.Stdout = &out
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err:= cmd.Run()
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if err != nil {
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fmt.Println(err)
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}
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outString := out.String()
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// could split by \n too
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split := strings.SplitAfter(outString,":")
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// 1st entry is garbage headers and ending is always \n##:
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split = split[1:]
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// create empty slice for all the devices
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//var devices []i2cdev
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devices := map[int]bool{} //maps device addresses to active bool
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for i,v := range split {
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lst := strings.Index(v,"\n")
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trimmed := v[:lst]
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trimmed = strings.Trim(trimmed," ")
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// trimmed now holds just possible sensor addresses
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count := strings.Split(trimmed," ")
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for j,d := range count {
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// the first row has to be offset by 3 but after its just i*16 + j
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offset := 0
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if i == 0 {
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offset = 3
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}
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addr := i*16 + j + offset
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if strings.Contains(d,"--") || strings.Contains(d,"UU") {
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// address is unconnected or reserved
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//devices = append(devices, I2Cdev{Addr:addr,Active:false})
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devices[addr] = false
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} else {
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//devices = append(devices, I2Cdev{Addr:addr,Active:true,LastSeen:now})
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devices[addr] = true
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}
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}
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}
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return devices
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}
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