Re: [RFC v2] uart: add ISR callback mechanism for UART drivers


Daniel Leung <daniel.leung@...>
 

On Thu, Mar 03, 2016 at 12:30:09PM -0300, Andre Guedes wrote:
Hi Daniel,

Quoting Daniel Leung (2016-03-02 22:35:24)
This is actually a nice improvement on the UART API since it moves the
burden of registering the ISR from the user layer to the driver layer,
which is the right place, IMO.

Actually, the UART API is very low level when we compare it with other
APIs such as SPI and I2C. For instance, the UART API exposes functions
to manipulate the FIFOs and check for interrupt flags. Is there any plan
to add higher level APIs such as "transmit the characters from this buffer
and call this callback once the transmission finishes" or "read 10
characters into this buffer and call this callback once it is done"?
This is something I have thought about, but there is no concrete plan.

Is there anything particular you are looking for? Use cases would be
a good start. This helps me to understand what needs to be done.
No, I don't have anything in particular. Probably the bluetooth drivers
and the console_uart driver are a good source of use cases. For instance,
they all have their own implementation of a mechanism read data
asynchronously. An API such as uart_read(dev, callback, buf, len) might
be useful.
I have created a JIRA to address this
@ https://jira.zephyrproject.org/browse/ZEP-89


-----
Daniel Leung

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