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|
package communication
import (
"fmt"
"log"
"go.bug.st/serial"
"go.bug.st/serial/enumerator"
)
const (
ST_VID = `0483`
)
type physical struct {
port serial.Port
rx chan byte
}
func newPhysical() (physical, error) {
p := physical{}
devices, err := getStSerials()
if err != nil {
return p, err
}
if len(devices) != 1 {
return p, fmt.Errorf("Require exactly one serial device from STMicroelectronics but %d attached", len(devices))
}
device := devices[0]
p.port, err = openSerial(device)
if err != nil {
return p, err
}
p.rx = make(chan byte)
return p, nil
}
func (p *physical) start() {
go p.receive()
}
func getStSerials() ([]string, error) {
retval := make([]string, 0)
ports, err := enumerator.GetDetailedPortsList()
if err != nil {
return retval, err
}
for _, port := range ports {
if port.IsUSB {
if port.VID == ST_VID {
retval = append(retval, port.Name)
}
}
}
return retval, nil
}
func openSerial(device string) (serial.Port, error) {
var port serial.Port
mode := &serial.Mode{
BaudRate: 115200,
}
port, err := serial.Open(device, mode)
if err != nil {
return port, err
}
return port, nil
}
func (p *physical) receive() {
for {
buff := make([]byte, 100)
n, err := p.port.Read(buff)
if err != nil {
log.Fatal(err)
}
for i := 0; i < n; i++ {
p.rx <- buff[i]
}
}
}
|
