From mboxrd@z Thu Jan  1 00:00:00 1970
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References: <CALp9=oKBUZ1PWAw5D6kpKXeGryu=vXuCDRHbS6j6Ko12-wRJ8g@mail.gmail.com>
	<96b9ce32468d844a80c002c470af9e0a@hamnavoe.com>
From: =?UTF-8?B?0J7Qu9C10LMg0JHQsNGF0LDRgNC10LI=?= <disconnectix@gmail.com>
Date: Thu, 16 Aug 2018 15:50:23 +0300
Message-ID: <CALp9=oL7iYDrvKaMBVzTfo8UxnHx6UhcBtC-1pzR6jyB_jPicg@mail.gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Content-Type: multipart/alternative; boundary="000000000000f59d7605738ce20e"
Subject: Re: [9fans] How read data from USB-device ?
Topicbox-Message-UUID: dabf129e-ead9-11e9-9d60-3106f5b1d025

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Not work (
Program itself:

package main

import(
    "flag"
    "fmt"
    "os"
)

func main() {

    var color = flag.Int("color", 0x00000000, "Color value")
    flag.Parse()

    var hexColor uint32 = uint32(*color)

    var rgb [3]byte;
    rgb[2] = byte(hexColor & 0x000000ff)
    rgb[1] = byte((hexColor & 0x0000ff00) >> 8)
    rgb[0] = byte((hexColor & 0x00ff0000) >> 16)

    usbControl, controlErr := os.Open("/dev/eiaU5/eiaUctl")

    if controlErr != nil {
        fmt.Println(controlErr)
        os.Exit(1)
    }
    defer usbControl.Close()

    usbControl.WriteString("b9600")
    usbControl.Sync()

    usbFile, usbErr := os.Open("/dev/eiaU5/eiaU")

    if usbErr != nil {
        fmt.Println(usbErr)
        os.Exit(1)
    }
    defer usbFile.Close()

    fmt.Print(rgb[0])
    fmt.Print(rgb[1])
    fmt.Print(rgb[2])

    usbFile.Write(rgb[:])
}

2018-08-16 14:26 GMT+03:00 Richard Miller <9fans@hamnavoe.com>:

> > I encountered some problem: there is a trivial program on Go that
> > writes to the files / dev / eiaU4 / eiaUctl and / dev / eiaU the
>
> I hope you meant /dev/eiaU4/eiaU, not /dev/eiaU
>
> Unless you do a "bind -a /dev/eiaU4 /dev" after starting the usb
> serial driver, which allows you to reference the device files
> as /dev/eiaUctl and /dev/eiaU and not have to remember the unit number.
>
>
>

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<div dir=3D"ltr"><div>Not work (</div><div>Program itself:</div><div><br></=
div>package main<br><br>import(<br>=C2=A0=C2=A0=C2=A0 &quot;flag&quot;<br>=
=C2=A0=C2=A0=C2=A0 &quot;fmt&quot;<br>=C2=A0=C2=A0=C2=A0 &quot;os&quot;<br>=
)<br><br>func main() {<br>=C2=A0=C2=A0=C2=A0 <br>=C2=A0=C2=A0=C2=A0 var col=
or =3D flag.Int(&quot;color&quot;, 0x00000000, &quot;Color value&quot;)<br>=
=C2=A0=C2=A0=C2=A0 flag.Parse()<br>=C2=A0=C2=A0=C2=A0 <br>=C2=A0=C2=A0=C2=
=A0 var hexColor uint32 =3D uint32(*color)<br>=C2=A0=C2=A0=C2=A0 <br>=C2=A0=
=C2=A0=C2=A0 var rgb [3]byte;<br>=C2=A0=C2=A0=C2=A0 rgb[2] =3D byte(hexColo=
r &amp; 0x000000ff)<br>=C2=A0=C2=A0=C2=A0 rgb[1] =3D byte((hexColor &amp; 0=
x0000ff00) &gt;&gt; 8)<br>=C2=A0=C2=A0=C2=A0 rgb[0] =3D byte((hexColor &amp=
; 0x00ff0000) &gt;&gt; 16)<br><br>=C2=A0=C2=A0=C2=A0 usbControl, controlErr=
 :=3D os.Open(&quot;/dev/eiaU5/eiaUctl&quot;)<br><br>=C2=A0=C2=A0=C2=A0 if =
controlErr !=3D nil {<br>=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 fmt.Println(=
controlErr) <br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 os.Exit(1) <br>=
=C2=A0=C2=A0=C2=A0 }<br>=C2=A0=C2=A0=C2=A0 defer usbControl.Close()<br><br>=
=C2=A0=C2=A0=C2=A0 usbControl.WriteString(&quot;b9600&quot;)<br>=C2=A0=C2=
=A0=C2=A0 usbControl.Sync()<br><br>=C2=A0=C2=A0=C2=A0 usbFile, usbErr :=3D =
os.Open(&quot;/dev/eiaU5/eiaU&quot;)<br><br>=C2=A0=C2=A0=C2=A0 if usbErr !=
=3D nil {<br>=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 fmt.Println(usbErr) <br>=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 os.Exit(1) <br>=C2=A0=C2=A0=C2=
=A0 }<br>=C2=A0=C2=A0=C2=A0 defer usbFile.Close()<br><br>=C2=A0=C2=A0=C2=A0=
 fmt.Print(rgb[0])<br>=C2=A0=C2=A0=C2=A0 fmt.Print(rgb[1])<br>=C2=A0=C2=A0=
=C2=A0 fmt.Print(rgb[2])<br>=C2=A0=C2=A0=C2=A0 <br>=C2=A0=C2=A0=C2=A0 usbFi=
le.Write(rgb[:])<br>}<br></div><div class=3D"gmail_extra"><br><div class=3D=
"gmail_quote">2018-08-16 14:26 GMT+03:00 Richard Miller <span dir=3D"ltr">&=
lt;<a href=3D"mailto:9fans@hamnavoe.com" target=3D"_blank">9fans@hamnavoe.c=
om</a>&gt;</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=3D"">&gt; =
I encountered some problem: there is a trivial program on Go that<br>
&gt; writes to the files / dev / eiaU4 / eiaUctl and / dev / eiaU the<br>
<br>
</span>I hope you meant /dev/eiaU4/eiaU, not /dev/eiaU<br>
<br>
Unless you do a &quot;bind -a /dev/eiaU4 /dev&quot; after starting the usb<=
br>
serial driver, which allows you to reference the device files<br>
as /dev/eiaUctl and /dev/eiaU and not have to remember the unit number.<br>
<br>
<br>
</blockquote></div><br></div>

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