I've built Kyria keyboard with BlueMicro840, and found that USB HID is working now.
For the split keyboard the next configurations are possible:
- Just left (master) is connected to the computer via USB.
- Just right (slave) is connected to the computer via USB.
- Both left and right are connected to the computer via USB.
For the case 1, everything is working the same as in the bluetooth mode.
For the case 2 and 3, both halves are functional, but layers activation is happened only in one direction, from master to slave.
Means, if the layer modifier is pressed on the master side, keypresses on the slave side are sending this layer characters, if the layer modifier is pressed on the slave side (and the slave is connected via USB), keypresses on the master side are sending the MAIN layer characters.
Then, the ideal wired mode would be if the split keyboard could just use the standard wired connection, the USB cable to the computer and the TRRS cable between halves. I know that that using TRRS connection between halves is not possible for BlueMicro840.
Then the desired behavior is if the keyboard would be fully functional, no matter if the master or slave or both connected via USB.
I see two reasons to use USB connection instead of Bluetooth, when the computer is not supporting Bluetooth (or connecting via Bluetooth is not possible), or when the batteries are discharged and USB is needed just for charging.
Connecting just master via USB works for the first reason, while if slave must be charged, it can be connected to a USB charger (not to the computer) and then it resolves for the second reason.
So, I'm not quite sure this feature is really needed, but I just want to describe my observations.
I've built Kyria keyboard with BlueMicro840, and found that USB HID is working now.
For the split keyboard the next configurations are possible:
For the case 1, everything is working the same as in the bluetooth mode.
For the case 2 and 3, both halves are functional, but layers activation is happened only in one direction, from master to slave.
Means, if the layer modifier is pressed on the master side, keypresses on the slave side are sending this layer characters, if the layer modifier is pressed on the slave side (and the slave is connected via USB), keypresses on the master side are sending the MAIN layer characters.
Then, the ideal wired mode would be if the split keyboard could just use the standard wired connection, the USB cable to the computer and the TRRS cable between halves. I know that that using TRRS connection between halves is not possible for BlueMicro840.
Then the desired behavior is if the keyboard would be fully functional, no matter if the master or slave or both connected via USB.
I see two reasons to use USB connection instead of Bluetooth, when the computer is not supporting Bluetooth (or connecting via Bluetooth is not possible), or when the batteries are discharged and USB is needed just for charging.
Connecting just master via USB works for the first reason, while if slave must be charged, it can be connected to a USB charger (not to the computer) and then it resolves for the second reason.
So, I'm not quite sure this feature is really needed, but I just want to describe my observations.