0

I have a .fex file for Cubietruck. Supposedly, the bluetooth pins are defined in the uart_para2. With the current config, I have uart0 and uart2 enabled, and everything else is disabled. Bluetooth functions fine under such condition.

Then, I changed the .fex file by simply renaming [uart_para2] to [uart_para3] and vice-verca (renaming uart3 to uart2). The new "uart2" (or the old "uart3") is still disabled.

Now bluetooth does not work anymore. dmesg | grep tty still shows that uart3 is mounted on /dev/ttyS1.

So what is UART and why does the label matter? I thought it's a label and nothing more, but evidently not.

1 Answer 1

1

A UART is a Universal Asynchronous Receiver and Transmitter. It is a device which takes parallel bits of data, as found in the computer, and serializes them to send over a medium such as a wire or the airwaves. It also takes data in in serial form and assembles it into a parallel form to be used in the computer. Here is the Wikipedia article and here is another good explanation. For even more information follow J F Sebastian's link in that page.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.