[BRLTTY] USB support on Active Braille

[Mario Lang]

lars at lamasti.net (Lars Bjørndal) writes:

> With recent svn versions of BRLTTY, there is something horrible wrong
> with the USB support on Handy Tech Active Braille. The braille display
> isn't updated unless you press a key on the display itself. So if brltty
> is started and you type something at the command line prompt, the typed
> text isn't on the display untill you press a key on the display.
>
> I have firmware version 2.1, which is an unofficial version.

I can now confirm your problem description on a device with Firmware
2.5.

I have a quick fix, but we need to dive more into the details of this
problem to fix it sufficiently well.

--- a/Drivers/Braille/HandyTech/braille.c
+++ b/Drivers/Braille/HandyTech/braille.c
@@ -1527,6 +1527,17 @@ brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
                 const unsigned char *bytes = &packet.fields.data.extended.data.bytes[0];
 
                 switch (packet.fields.data.extended.type) {
+                  case HT_EXTPKT_Confirmation:
+                    switch (bytes[0]) {
+                      case HT_PKT_NAK:
+                        updateRequired = 1;
+                      case HT_PKT_ACK:
+                        return EOF;
+
+                      default:
+                        break;
+                    }
+                    break;
                   case HT_EXTPKT_Key:
                     if (model->interpretByte(bytes[0])) {
                       updateCells(brl);

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