NRF52832 - NRFX_UARTE_TX maximum transfer size

[Luke Galea]

I am trying to figure out the maximum transfer size for nrfx_uarte_tx. The documentation says to check the MAXCNT register description in the Product Specification. See page 458 in Product Specification.

[Marjeris Romero]

Hi,

You can set the TXD.MAXCNT register give the maximum number of bytes in transmit buffer
https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf#%5B%7B%22num%22%3A2535%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22XYZ%22%7D%2C56.692%2C487.904%2Cnull%5D

Here is an overview of the EasyDMA MAXCNT bit length: https://infocenter.nordicsemi.com/topic/struct_nrf52/struct/nrf52.html

For nRF52832 UARTE it's 8 bit register which means 255 bytes.

BR,

Marjeris