i can't find uart pins in nrf51822

RE: i can't find uart pins in nrf51822

cruffy — Wed, 20 Jun 2018 07:49:54 GMT

thank you very much for your help

RE: i can't find uart pins in nrf51822

Einar Thorsrud — Wed, 20 Jun 2018 05:58:49 GMT

You do that in software, by configuring the UART peripheral accordingly (setting the PSELRTS, PSELTXD, PSELCTS and PSELRXD registers). In practice you will most likely not do this directly, but rather via the UART driver.

RE: i can't find uart pins in nrf51822

cruffy — Tue, 19 Jun 2018 14:36:43 GMT

how about enable pin for uart?

RE: i can't find uart pins in nrf51822

Einar Thorsrud — Tue, 19 Jun 2018 14:35:58 GMT

Yes

RE: i can't find uart pins in nrf51822

cruffy — Tue, 19 Jun 2018 14:26:07 GMT

then can i use P0.09 (TX) and P0.10 (RX) for uart?

i really don't know how to confirm these.

RE: i can't find uart pins in nrf51822

Einar Thorsrud — Tue, 19 Jun 2018 14:16:00 GMT

Yes, you can use any of the GPIO pins for UART. You do that in software, by configuring the UART peripheral accordingly (setting the PSELRTS, PSELTXD, PSELCTS and PSELRXD registers). In practice you will most likely not do this directly, but rather via the UART driver.

RE: i can't find uart pins in nrf51822

cruffy — Tue, 19 Jun 2018 14:11:54 GMT

thank you ,i checked datasheets. i can see following

The GPIOs used for each UART interface line can be chosen from any GPIO on the device and are
independently configurable. This enables great flexibility in device pinout and efficient use of board space
and signal routing.

then can i use all pins for uart?

sorry , i don't know how to choose GPIO for uart.

RE: i can't find uart pins in nrf51822

Einar Thorsrud — Tue, 19 Jun 2018 12:30:28 GMT

Hi,

All nRF5 devices have a pin crossbar that allow any digital I/O pin to be connected to any digital peripheral. You can refer to the Pin assignments and functions chapter in the product specification to see a list of all the GPIO pins. Then you configure the UART peripheral to use those pins (in software).