RE: nrf_serial - how to tell available TX buffer space BEFORE using nrf_serial_write()

Vidar Berg — Fri, 20 Apr 2018 10:19:14 GMT

Hi,

That is correct, nrf_serial_write() returns the number of queued bytes. You can enable the event handler to get a callback when the data has actually been transferred.

The serial library does not seem to expose an API for checking available queue size, but you can use nrf_queue_available_get() from queue module instead:

available_buffer = nrf_queue_available_get(serial_queues.p_txq);