geekhack
geekhack Projects => Making Stuff Together! => Topic started by: gator456 on Mon, 23 October 2023, 10:27:22
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Hello
I have implemented a keyboard controller using the PJRC Teensy microcontroller. I used the example on their page to implement the firmware (https://www.pjrc.com/teensy/usb_keyboard.html)
The problem I am seeing is that if I hold down a key I do not get a repeat for MacOS but I do get a repeat for Windows&Linux.
After some searching on the internet I found that you have to turn on repeat in the MacOS:
https://www.howtogeek.com/267463/how-to-enable-key-repeating-in-macos/
With this change I get repeats on the laptop keyboard and commercial keyboards. However MacOS will not give me repeats on my keyboard.
BTW: I do not own a USB bus sniffer or a logic analyzer.
A typical event sequence from my controller looks like
- Key is pressed & keycode is sent
- Key is released & 0x00 is sent (this is the key release event)
For a hold of A key the sequence of events is:
- Letter 'A' is pressed & controller send 0x04
- If the OS does not see a key release event (0x00) then the OS starts repeating the key (until 0x00 is sent)
With MacOS a repeat never occurs.
I am unable to figure out what a commercial keyboard is doing different.
Anyone have experience with this?