serial port library

RE: serial port library

Stas — Thu, 02 Nov 2017 06:40:41 GMT

Thanks for clearify

RE: serial port library

Jakub Rzeszutko — Thu, 02 Nov 2017 06:39:17 GMT

To be more precise:

nrf52832 = 1xUART or 1xUARTE

nrf52840 = 1xUART 1xUARTE or 2xUARTE

RE: serial port library

Sigurd — Wed, 01 Nov 2017 08:56:09 GMT

No, 1 instance on nRF52832 and 2 instances on nRF52840

RE: serial port library

Stas — Wed, 01 Nov 2017 08:55:07 GMT

Do I understand correct.. We have 2 instance of uart for nrf52832 and 4 instance for nrf52840 chip?

RE: serial port library

Jakub Rzeszutko — Wed, 25 Oct 2017 11:27:45 GMT

You can have still two instances of UARTE but there is almost no problem to connect Tx line from nrf52 to more receivers.

The only limitation that comes to my mind is related with current "consumption" of each node from Tx line. If there will be too many devices UARTE signal might have too big voltage drop to be correctly interpreted.

RE: serial port library

RK — Wed, 25 Oct 2017 10:47:55 GMT

still two.

RE: serial port library

Stas — Wed, 25 Oct 2017 10:39:35 GMT

ok. How many if I need only rx line on 9600bps

RE: serial port library

Jakub Rzeszutko — Wed, 25 Oct 2017 10:28:22 GMT

You can have maximum 2 instatnces, so biderctional communication is possible with 2 chips only.

RE: serial port library

Stas — Wed, 25 Oct 2017 10:24:27 GMT

Thanks. So can I use this library in situation where I would use arduino softwareserial library? For example I need to communicate with 3 chips via uart. Can I solve this task by serial port library?

RE: serial port library

Sigurd — Wed, 25 Oct 2017 09:29:34 GMT

Hi,

The SoftwareSerial library in Arduino implements UART in software("bit banging"). It has several known limitations, e.g. if using multiple software serial ports, only one can receive data at a time.

The Serial port library in the SDK is designed as a more sophisticated replacement for the app_uart module, with Multi-instance capability, configurable buffers and more robust and generic API. It does not implement any “software” UART. The Multi-instance capability in the serial port library is very useful in e.g. the nRF52840 where you have 2 hardware UARTE instances.