Serial library event handler example

[SRose]

Hi,

Does anyone have a complete example of using an event handler to read UART data set up with the serial library? This post is the only incomplete example I can find. The example program sets _ev_handler to NULL in the setup NRF_SERIAL_CONFIG_DEF

OR my devices needs to constantly read continuous incoming UART data, so does someone have the best practice on reading the serial so the buffer doesn't overflow? Thanks

[Jørgen Holmefjord]

You should only have to define the event handler and pass this to NRF_SERIAL_CONFIG_DEF. What exactly do you want the handler to do?

[SRose]

The byte data coming in is a proprietary protocol. I need to store the data in a big buffer and search for the start / end bytes for each message and then parse the message. I do have a timing requirement. Once I receive the end byte for a given message, the program needs to respond by sending a msg on the serial within 300us - 6.0ms. It seems to me using the event handler is better for this than always querying the serial queue with a timer?

[SRose]

Jørgen, Does the event handler set in NRF_SERIAL_CONFIG_DEF get called for EACH byte received by the UART, or does it get called once after __?__ From the previous post, should I read the entire queue until empty? or just one byte off the queue like the example?

[Jørgen Holmefjord]

The event handler will be called on every NRF_DRV_UART_EVT_RX_DONE event from the UART driver. This will either happen when the number of bytes passed to the size parameter of nrf_serial_read() have been received, or when the timeout have been reached.

[aaronxu]

I am afraid that the  event handler will be called on every single byte received by the UART. No matter the "nrf_serial_read" parameters.

Could you kindly share with us an example use event handler for receive more than one byte?